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Journal articles on the topic 'Ultrastable laser'

Author: Grafiati

Published: 14 March 2023

Last updated: 31 July 2025

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1

Lulu Yan, Lulu Yan, Yanyan Zhang Yanyan Zhang, Zhaoyang Tai Zhaoyang Tai, et al. "Multi-cavity-stabilized ultrastable laser." Chinese Optics Letters 16, no. 12 (2018): 121403. http://dx.doi.org/10.3788/col201816.121403.

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2

Boyd, Jamie A., and Thierry Lahaye. "A basic introduction to ultrastable optical cavities for laser stabilization." American Journal of Physics 92, no. 1 (2024): 50–58. http://dx.doi.org/10.1119/5.0161369.

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We give a simple introduction to the properties and use of ultrastable optical cavities, which are increasingly common in atomic and molecular physics laboratories for stabilizing the frequency of lasers to linewidths at the kHz level or below. Although the physics of Fabry–Perot interferometers is part of standard optics curricula, the specificities of ultrastable optical cavities, such as their high finesse, fixed length, and the need to operate under vacuum, can make their use appear relatively challenging to newcomers. Our aim in this work is to bridge the gap between generic knowledge abo

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3

Marceau, Claude, Scott Beattie, Wojciech Pakulski, and Marina Gertsvolf. "Frequency comb for ⁸⁸Sr⁺ clock frequency comparison with Cs fountain clock at the NRC." Journal of Physics: Conference Series 2889, no. 1 (2024): 012008. http://dx.doi.org/10.1088/1742-6596/2889/1/012008.

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Abstract We describe a polarization maintaining erbium fibre optical frequency comb that was used to link NRC-FCs2 to an ultrastable laser, generating ultrastable microwaves (MW) that are shown to significantly shorten the fountain clock averaging time. A detailed experimental setup for our next measurement linking NRC 88Sr+ clock to the NRC-FCs2 Cs fountain clock is also presented.

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4

Ye, Yanxia, Leilei He, Yunlong Sun, et al. "Vibration Property of a Cryogenic Optical Resonator within a Pulse-Tube Cryostat." Sensors 21, no. 14 (2021): 4696. http://dx.doi.org/10.3390/s21144696.

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Cryogenic ultrastable laser cavities push laser stability to new levels due to their lower thermal noise limitation. Vibrational noise is one of the major obstacles to achieve a thermal-noise-limited cryogenic ultrastable laser system. Here, we carefully analyze the vibrational noise contribution to the laser frequency. We measure the vibrational noise from the top of the pulse-tube cryocooler down to the experiment space. Major differences emerge between room and cryogenic temperature operation. We cooled a homemade 6 cm sapphire optical resonator down to 3.4 K. Locking a 1064 nm laser to the

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5

Schioppo, M., J. Kronjäger, A. Silva, et al. "Comparing ultrastable lasers at 7 × 10−17 fractional frequency instability through a 2220 km optical fibre network." Nature Communications 13 (January 11, 2022): 212. https://doi.org/10.1038/s41467-021-27884-3.

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Ultrastable lasers are essential tools in optical frequency metrology enabling unprecedented measurement precision that impacts on fields such as atomic timekeeping, tests of fundamental physics, and geodesy. To characterise an ultrastable laser it needs to be compared with a laser of similar performance, but a suitable system may not be available locally. Here, we report a comparison of two geographically separated lasers, over the longest ever reported metrological optical fibre link network, measuring 2220 km in length, at a state-of-the-art fractional-frequency instability of 7 &tim

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6

Qian, Yuchen, Yong Xie, Jianjun Jia, and Liang Zhang. "Design of Active Vibration Isolation Controller with Disturbance Observer-Based Linear Quadratic Regulator for Optical Reference Cavities." Sensors 23, no. 1 (2022): 302. http://dx.doi.org/10.3390/s23010302.

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The optical reference cavity in an ultrastable laser is sensitive to vibrations; the microvibrations in a space platform affect the accuracy and stability of such lasers. In this study, an active vibration isolation controller is proposed to reduce the effect of vibrations on variations in the cavity length and improve the frequency stability of ultrastable lasers. Based on the decentralized control strategy, we designed a state-differential feedback controller with a linear quadratic regulator (LQR) and added a disturbance observer (DOB) to estimate the source noise. Experiments were conducte

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7

Yang, Ruitao, Haisu Lv, Jing Luo, et al. "Ultrastable Offset-Locking Continuous Wave Laser to a Frequency Comb with a Compound Control Method for Precision Interferometry." Sensors 20, no. 5 (2020): 1248. http://dx.doi.org/10.3390/s20051248.

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A simple and robust analog feedforward and digital feedback compound control system is presented to lock the frequency of a slave continuous wave (CW) laser to an optical frequency comb. The beat frequency between CW laser and the adjacent comb mode was fed to an acousto-optical frequency shifter (AOFS) to compensate the frequency dithering of the CW laser. A digital feedback loop was achieved to expand the operation bandwidth limitation of the AOFS by over an order of magnitude. The signal-to-noise ratio of the interference signal was optimized using a grating-based spectral filtering detecti

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8

Krok, Patrizia, and Gabrielle Thomas. "Ultrastable lasers for optical clocks." Photoniques, no. 128 (2024): 72–76. http://dx.doi.org/10.1051/photon/202412872.

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In quantum science and technology applications such as optical clocks, ultrastable laser sources can address extremely narrow atomic transitions without introducing noise to the system. The required level of stability and precision has historically only been achieved under controlled laboratory conditions. Novel commercial solutions combined with new approaches are now meeting the high demands for field applications of emergent quantum technologies.

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9

Carlson, David R., Daniel D. Hickstein, Wei Zhang, et al. "Ultrafast electro-optic light with subcycle control." Science 361, no. 6409 (2018): 1358–63. http://dx.doi.org/10.1126/science.aat6451.

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Light sources that are ultrafast and ultrastable enable applications like timing with subfemtosecond precision and control of quantum and classical systems. Mode-locked lasers have often given access to this regime, by using their high pulse energies. We demonstrate an adaptable method for ultrastable control of low-energy femtosecond pulses based on common electro-optic modulation of a continuous-wave laser light source. We show that we can obtain 100-picojoule pulse trains at rates up to 30 gigahertz and demonstrate sub–optical cycle timing precision and useful output spectra spanning the ne

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10

Tschernajew, Maxim, Vinzenz Hilbert, Robert Klas, et al. "High-brightness table-top coherent XUV source at 130eV." EPJ Web of Conferences 307 (2024): 02053. http://dx.doi.org/10.1051/epjconf/202430702053.

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We present a highly stable, easy-to-use, table-top coherent XUV source delivering a brightness of >1kW/(mm²sr)/1%BW at 130eV (9.5nm). It is based on high-harmonic generation driven by an ultrastable ytterbium-based fiber laser and a multipass-cell-based post- compression to 35fs.

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11

De Martin Júnior, J., S. K. N. Valappil, S. T. Müller, P. W. Courteille, V. S. Bagnato, and D. V. Magalhães. "Development of an ultrastable laser at 1550 nm." Journal of Physics: Conference Series 975 (March 2018): 012069. http://dx.doi.org/10.1088/1742-6596/975/1/012069.

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12

Zimmermann, Felix, Sören Richter, Sven Döring, Andreas Tünnermann, and Stefan Nolte. "Ultrastable bonding of glass with femtosecond laser bursts." Applied Optics 52, no. 6 (2013): 1149. http://dx.doi.org/10.1364/ao.52.001149.

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13

Yan, Lulu, Jun Ruan, Pan Zhang, et al. "Optically Referenced Microwave Generator with Attosecond-Level Timing Noise." Photonics 12, no. 2 (2025): 153. https://doi.org/10.3390/photonics12020153.

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Microwave sources based on ultrastable lasers and optical frequency combs (OFCs) exhibit ultralow phase noise and ultrahigh-frequency stability, which are important for many applications. Herein, we present a microwave source that is phase-locked to an ultrastable continuous-wave laser, with a relative frequency instability of 7 × 10−16 at 1 s. An Er:fiber-based OFC and an optic-to-electronic converter with low residual noise are employed to confer optical frequency stability on the 9.6 GHz microwave signal. Instead of using the normal cascaded Mach–Zehnder interferometer method, we developed

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14

Yan Beifei, 晏北飞, 肖锐 Xiao Rui, 蔡桢荻 Cai Zhendi та ін. "一种用于超稳激光的数字控制锁频电路". Chinese Journal of Lasers 51, № 13 (2024): 1301010. http://dx.doi.org/10.3788/cjl240450.

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15

Theophilopoulos, George. "50-GHz, ultrastable, polarization-maintaining semiconductor fiber ring laser." Optical Engineering 44, no. 6 (2005): 064206. http://dx.doi.org/10.1117/1.1926867.

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16

Huang, Yafeng, Di Hu, Meifeng Ye, et al. "All-fiber-based ultrastable laser with long-term frequency stability of 1.1 × 10-14." Chinese Optics Letters 21, no. 3 (2023): 031404. http://dx.doi.org/10.3788/col202321.031404.

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17

Prasad, Brij Mohan Kumar, and Aparna Bawankan. "High-Resolution Spectroscopy through Tunable, Ultrastable Optical Radiation Diode Laser." MATEC Web of Conferences 43 (2016): 03001. http://dx.doi.org/10.1051/matecconf/20164303001.

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18

TAM, ANDREW, and SAZZADUR CHOWDHURY. "EXPLOITING SONOLUMINESCENCE TO REALIZE A MEMS ULTRASONIC SENSOR." Journal of Circuits, Systems and Computers 17, no. 02 (2008): 309–32. http://dx.doi.org/10.1142/s0218126608004290.

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The design of a MEMS ultrasonic sensor has been presented that exploits the Single Bubble Sonoluminescence (SBSL) phenomenon to realize an energy transduction mechanism from acoustical to electrical domain. In the developed scheme, highly stable laser like short duration light pulses are emitted when ultrasound waves strike a thermally generated microbubble stabilized in a confined volume of 1% xenon-enriched water. The emitted light pulses are detected by an integrated profiled silicon type photodetector to generate ultrastable 100 picoseconds duration current pulses per acoustical cycle. The

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19

Lawall, John, J. Marc Pedulla, and Yann Le Coq. "Ultrastable laser array at 633 nm for real-time dimensional metrology." Review of Scientific Instruments 72, no. 7 (2001): 2879–88. http://dx.doi.org/10.1063/1.1374600.

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20

Yang, Hongxing, Ruitao Yang, Pengcheng Hu, and Jiubin Tan. "Ultrastable offset-locked frequency-stabilized heterodyne laser source with water cooling." Applied Optics 56, no. 33 (2017): 9179. http://dx.doi.org/10.1364/ao.56.009179.

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21

Nakazawa, M., Y. Kimura, and E. Yoshida. "Ultrastable harmonically and regeneratively modelocked polarisation-maintaining erbium fibre ring laser." Electronics Letters 30, no. 19 (1994): 1603–5. http://dx.doi.org/10.1049/el:19941072.

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22

Clark, T. R., T. F. Carruthers, P. J. Matthews, and I. N. Duling. "Phase noise measurements of ultrastable 10 GHz harmonically modelocked fibre laser." Electronics Letters 35, no. 9 (1999): 720. http://dx.doi.org/10.1049/el:19990516.

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23

Wu, Meimei, Xin Bao, Shuxian Yu, et al. "Electromagnetically Induced Transparency Spectra of 6Li Rydberg Atoms." Photonics 10, no. 12 (2023): 1367. http://dx.doi.org/10.3390/photonics10121367.

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Rydberg atoms possess highly excited valence electrons that are far away from atomic cations. Compared with ground states, Rydberg states are excited states with a high principal quantum number n that exhibit large electric dipole moments and have a variety of applications in quantum information processing. In this communication, we report the measurement of the 6Li Rydberg excitation spectrum by ladder-type electromagnetically induced transparency (EIT) in a vapor cell. The 2p→ns/nd EIT spectra were recorded by sweeping the frequency of an ultraviolet Rydberg pumping laser while keeping the p

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24

Pizzocaro, M., G. A. Costanzo, A. Godone, et al. "Realization of an ultrastable 578-nm laser for an Yb lattice clock." IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 59, no. 3 (2012): 426–31. http://dx.doi.org/10.1109/tuffc.2012.2211.

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25

Bartels, A., S. A. Diddams, C. W. Oates, et al. "Femtosecond-laser-based synthesis of ultrastable microwave signals from optical frequency references." Optics Letters 30, no. 6 (2005): 667. http://dx.doi.org/10.1364/ol.30.000667.

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26

Yin, Zhiqian, Chuanbo Zhang, Shijian Guan, et al. "Long-term ultrastable frequency dissemination via a 50-km spooled fiber link using a two-section DFB laser." Chinese Optics Letters 22, no. 1 (2024): 013903. http://dx.doi.org/10.3788/col202422.013903.

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27

Kim, D. Y., M. Pelusi, Z. Ahmed, D. Novak, H. F. Liu, and Y. Ogawa. "Ultrastable millimetre-wave signal generation using hybrid modelocking of a monolithic DBR laser." Electronics Letters 31, no. 9 (1995): 733. http://dx.doi.org/10.1049/el:19950475.

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28

Shao, X. D., H. N. Han, Y. B. Su, et al. "Precision locking CW laser to ultrastable optical frequency comb by feed-forward method." AIP Advances 9, no. 11 (2019): 115003. http://dx.doi.org/10.1063/1.5121860.

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29

Hagemann, Christian, Christian Grebing, Christian Lisdat, et al. "Ultrastable laser with average fractional frequency drift rate below 5 × 10^−19/s." Optics Letters 39, no. 17 (2014): 5102. http://dx.doi.org/10.1364/ol.39.005102.

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30

Yakabe, Masatsugu, Ko Nito, Masato Yoshida, et al. "Ultrastable cesium atomic clock with a 91926-GHz regeneratively mode-locked fiber laser." Optics Letters 30, no. 12 (2005): 1512. http://dx.doi.org/10.1364/ol.30.001512.

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31

Yamazawa, Chieko, Yoshinori Hirano, Hiroaki Imoto, Naoto Tsutsumi, and Kensuke Naka. "Superior light-resistant dithieno[3,2-b:2′,3′-d]arsole-based polymers exhibiting ultrastable amplified spontaneous emission." Chemical Communications 57, no. 13 (2021): 1595–98. http://dx.doi.org/10.1039/d0cc07521c.

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32

Yao Bo, 姚波, 陈群峰 Chen Qunfeng, 陈雨君 Chen Yujun, et al. "280 mHz Linewidth DBR Fiber Laser Based on PDH Frequency Stabilization with Ultrastable Cavity." Chinese Journal of Lasers 48, no. 5 (2021): 0501014. http://dx.doi.org/10.3788/cjl202148.0501014.

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33

Li, Ye, Yi-Ge Lin, Qiang Wang, et al. "A Hertz-Linewidth Ultrastable Diode Laser System for Clock Transition Detection of Strontium Atoms." Chinese Physics Letters 31, no. 2 (2014): 024207. http://dx.doi.org/10.1088/0256-307x/31/2/024207.

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34

Berdasov, O. I., A. Yu Gribov, G. S. Belotelov, et al. "Ultrastable laser system for spectroscopy of the 1S0 – 3P0 clock transition in Sr atoms." Quantum Electronics 47, no. 5 (2017): 400–405. http://dx.doi.org/10.1070/qel16346.

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35

Zhang, Jiafeng, Zhen Yang, Xiaoshan Ma, et al. "Enhanced Detection Precision of the Taiji Program by Frequency Setting Strategy Based on a Hierarchical Optimization Algorithm." Sensors 23, no. 23 (2023): 9431. http://dx.doi.org/10.3390/s23239431.

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For space-based gravitational wave detection, a laser interferometric measurement system composed of a three-spacecraft formation offers the most rewarding bandwidth of astrophysical sources. There are no oscillators available that are stable enough so that each spacecraft could use its own reference frequency. The conversion between reference frequencies and their distribution between all spacecrafts for the synchronization of the different metrology systems is the job of the inter-spacecraft frequency setting strategy, which is important for continuously acquiring scientific data and suppres

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36

Choi, Moon-Youl, Dae-Suk Kim, Dae Seung Hong, Jung Ho Kim, and Yong-Tae Kim. "Ultrastable Aqueous Graphite Nanofluids Prepared by Single-step Liquid-phase Pulsed Laser Ablation (LP-PLA)." Chemistry Letters 40, no. 7 (2011): 768–69. http://dx.doi.org/10.1246/cl.2011.768.

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37

Li, Shulei, Yatao Zhang, Zhiran Zhao, et al. "Ultrastable and Low-Threshold Two-Photon-Pumped Amplified Spontaneous Emission from CsPbBr3/Ag Hybrid Microcavity." Nanomaterials 14, no. 20 (2024): 1622. http://dx.doi.org/10.3390/nano14201622.

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Halide perovskite materials have garnered significant research attention due to their remarkable performance in both photoharvesting photovoltaics and photoemission applications. Recently, self-assembled CsPbBr3 superstructures (SSs) have been demonstrated to be promising lasing materials. In this study, we report the ultrastable two-photon-pumped amplified stimulated emission from a CsPbBr3 SS/Ag hybrid microcavity with a low threshold of 0.8 mJ/cm2 at room temperature. The experimental results combined with numerical simulations show that the CsPbBr3 SS exhibits a significant enhancement in

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38

Zhang, Shuang, Hao Qiao, Di Ai, Min Zhou, and Xinye Xu. "Frequency stabilization of multiple wavelength lasers based on a broadband spectrum." Laser Physics Letters 19, no. 9 (2022): 095701. http://dx.doi.org/10.1088/1612-202x/ac8283.

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Abstract We report on frequency stabilization of multiple wavelength lasers operating at 1389 and 1695 nm simultaneously on a broadband spectrum. These lasers are implemented in ytterbium optical lattice clock experiments, which need to have a narrow enough linewidth and maintain high long-term frequency stability. A 1560 nm femtosecond mode-locked laser with a narrow mode spacing of 250 MHz is used as a master laser, which is referenced to a local ultrastable optical cavity with the instability better than 1 × 10−15 at 1 s averaging time. Through the combination of erbium-doped fiber amplifie

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39

Zalivako, I. V., I. A. Semerikov, A. S. Borisenko, et al. "Compact ultrastable laser system for spectroscopy of 2S1/2 → 2D3/2 quadrupole transition in 171Yb+ ion." Quantum Electronics 50, no. 9 (2020): 850–54. http://dx.doi.org/10.1070/qel17373.

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40

Blumröder, Ulrike, Paul Köchert, Thomas Fröhlich та ін. "A GPS-Referenced Wavelength Standard for High-Precision Displacement Interferometry at λ = 633 nm". Sensors 23, № 3 (2023): 1734. http://dx.doi.org/10.3390/s23031734.

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Since the turn of the millennium, the development and commercial availability of optical frequency combs has led to a steadily increase of worldwide installed frequency combs and a growing interest in using them for industrial-related metrology applications. Especially, GPS-referenced frequency combs often serve as a “self-calibrating” length standard for laser wavelength calibration in many national metrology institutes with uncertainties better than u = 1 × 10−11. In this contribution, the application of a He-Ne laser source permanently disciplined to a GPS-referenced frequency comb for the

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41

Mörz, Florian, Rostyslav Semenyshyn, Tobias Steinle, et al. "Nearly diffraction limited FTIR mapping using an ultrastable broadband femtosecond laser tunable from 133 to 8 µm." Optics Express 25, no. 26 (2017): 32355. http://dx.doi.org/10.1364/oe.25.032355.

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42

Dong, Li, Hongwei Chu, Xiao Wang, Ying Li, Shengzhi Zhao, and Dechun Li. "Enhanced broadband nonlinear optical response of TiO2/CuO nanosheets via oxygen vacancy engineering." Nanophotonics 10, no. 5 (2021): 1541–51. http://dx.doi.org/10.1515/nanoph-2020-0649.

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Abstract Cupric oxide (CuO), as a transition metal oxide (TMO) semiconductor, has attracted tremendous attention for various applications. In the present work, we synthesize the CuO nanosheets modified by TiO2 nanoparticles via a facile, non-toxic two-step method. Subsequently, the morphology and the structures of CuO and TiO2/CuO nanocomposites are investigated. By utilizing the common Z-scan technology, broadband nonlinear optical (NLO) properties of the as-prepared CuO nanosheets and TiO2/CuO nanocomposites are demonstrated, elucidating the enhancement on the NLO response via the TiO2 dopan

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43

HAYASAKI, Yoshio, and Quang Duc PHAM. "Optical Profi lometer Using Single Pixel Camera and Radio Frequency Comb Generated by Ultrastable Mode-locked Femtosecond Laser." Review of Laser Engineering 41, no. 12 (2013): 1017. http://dx.doi.org/10.2184/lsj.41.12_1017.

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44

Ye, Jun, John L. Hall, and Scott A. Diddams. "Precision phase control of an ultrawide-bandwidth femtosecond laser: a network of ultrastable frequency marks across the visible spectrum." Optics Letters 25, no. 22 (2000): 1675. http://dx.doi.org/10.1364/ol.25.001675.

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45

Cantin, E., O. Lopez, C. Chardonnet, et al. "REFIMEVE frequency and time network and applications." Journal of Physics: Conference Series 2889, no. 1 (2024): 012031. http://dx.doi.org/10.1088/1742-6596/2889/1/012031.

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Abstract We present the development and current status of the REFIMEVE national research infrastructure, which disseminates time and frequency reference signals generated at LNE-SYRTE to research labs all over France. Using mainly the optical fiber backbone of RENATER, the French National Research and Education Network, REFIMEVE currently provides an optical frequency reference to around 15 labs, and to connection points to Germany, the UK, Italy and Switzerland. The robustness of the various types of equipment specifically developed for the transfer of ultrastable frequencies and the efficien

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46

Golovizin, A., V. Bushmakin, S. Fedorov та ін. "Ultrastable Laser System for Spectroscopy of the 1.14 μm Inner-Shell Clock Transition in Tm and Its Absolute Frequency Measurement". Journal of Russian Laser Research 40, № 6 (2019): 540–46. http://dx.doi.org/10.1007/s10946-019-09835-y.

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47

Qaid, Saif M. H., Hamid M. Ghaithan, Huda S. Bawazir, and Abdullah S. Aldwayyan. "Surface Passivation for Promotes Bi-Excitonic Amplified Spontaneous Emission in CsPb(Br/Cl)3 Perovskite at Room Temperature." Polymers 15, no. 9 (2023): 1978. http://dx.doi.org/10.3390/polym15091978.

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Perovskite-type lead halides exhibit promising performances in optoelectronic applications, for which lasers are one of the most promising applications. Although the bulk structure has some advantages, perovskite has additional advantages at the nanoscale owing to its high crystallinity given by a lower trap density. Although the nanoscale can produce efficient light emission, its comparatively poor chemical and colloidal stability limits further development of devices based on this material. Nevertheless, bulk perovskites are promising as optical amplifiers. There has been some developmental

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48

Monami, Shifat J., Ashraf Uddin, and Willis E. Hames. "Multi-proxy provenance of the lower Pennsylvanian Pottsville sandstone of the northern Appalachian basin in Pennsylvania, U.S.A: Paleodrainage, sources, and detrital history." Journal of Sedimentary Research 92, no. 3 (2022): 304–19. http://dx.doi.org/10.2110/jsr.2020.189.

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ABSTRACT The lower Pennsylvanian Pottsville Formation, in the Appalachian foreland basin, constitutes a late Paleozoic clastic wedge formed close to the Appalachian orogenic belt. In this study, we analyzed Pottsville sandstone from the western bituminous and eastern anthracite fields in Pennsylvania to evaluate the detrital history of the sediments. Petrographic modal analyses show that sandstone in the western bituminous field ranges from quartzarenite to sublitharenite, with mean composition of Qt84F1L15; sampled sandstone from the eastern anthracite field is dominated by sublitharenite to

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49

González Hernández, J. I., R. Rebolo, L. Pasquini, et al. "The solar gravitational redshift from HARPS-LFC Moon spectra." Astronomy & Astrophysics 643 (November 2020): A146. http://dx.doi.org/10.1051/0004-6361/202038937.

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Context. The general theory of relativity predicts the redshift of spectral lines in the solar photosphere as a consequence of the gravitational potential of the Sun. This effect can be measured from a solar disk-integrated flux spectrum of the Sun’s reflected light on Solar System bodies. Aims. The laser frequency comb (LFC) calibration system attached to the HARPS spectrograph offers the possibility of performing an accurate measurement of the solar gravitational redshift (GRS) by observing the Moon or other Solar System bodies. Here, we analyse the line shift observed in Fe absorption lines

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50

Marmet, L., A. A. Madej, K. J. Siemsen, J. E. Bernard, and B. G. Whitford. "Precision frequency measurement of the /sup 2/S/sub 1/2/-/sup 2/D/sub 5/2/ transition of Sr/sup +/ with a 674-nm diode laser locked to an ultrastable cavity." IEEE Transactions on Instrumentation and Measurement 46, no. 2 (1997): 169–73. http://dx.doi.org/10.1109/19.571804.

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