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1

Huang, Shu-Wei, Jinghui Yang, Mingbin Yu, et al. "A broadband chip-scale optical frequency synthesizer at 2.7 × 10−16 relative uncertainty." Science Advances 2, no. 4 (2016): e1501489. http://dx.doi.org/10.1126/sciadv.1501489.

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Optical frequency combs—coherent light sources that connect optical frequencies with microwave oscillations—have become the enabling tool for precision spectroscopy, optical clockwork, and attosecond physics over the past decades. Current benchmark systems are self-referenced femtosecond mode-locked lasers, but Kerr nonlinear dynamics in high-Q solid-state microresonators has recently demonstrated promising features as alternative platforms. The advance not only fosters studies of chip-scale frequency metrology but also extends the realm of optical frequency combs. We report the full stabiliza
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2

Shioda, Tatsutoshi, and Toshiaki Yamazaki. "Ultrafast optical frequency comb synthesizer and analyzer." Optics Letters 37, no. 17 (2012): 3642. http://dx.doi.org/10.1364/ol.37.003642.

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3

Kim, Eok Bong. "Optical frequency comb comparison between optical clock mode and optical frequency synthesizer mode." Optical Engineering 50, no. 2 (2011): 023602. http://dx.doi.org/10.1117/1.3533731.

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4

Ricciardi, Iolanda, Simona Mosca, Maria Parisi, et al. "Optical Frequency Combs in Quadratically Nonlinear Resonators." Micromachines 11, no. 2 (2020): 230. http://dx.doi.org/10.3390/mi11020230.

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Optical frequency combs are one of the most remarkable inventions in recent decades. Originally conceived as the spectral counterpart of the train of short pulses emitted by mode-locked lasers, frequency combs have also been subsequently generated in continuously pumped microresonators, through third-order parametric processes. Quite recently, direct generation of optical frequency combs has been demonstrated in continuous-wave laser-pumped optical resonators with a second-order nonlinear medium inside. Here, we present a concise introduction to such quadratic combs and the physical mechanism
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5

Weng, Wenle, Aleksandra Kaszubowska-Anandarajah, Junqiu Liu, Prince M. Anandarajah, and Tobias J. Kippenberg. "Frequency division using a soliton-injected semiconductor gain-switched frequency comb." Science Advances 6, no. 39 (2020): eaba2807. http://dx.doi.org/10.1126/sciadv.aba2807.

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With optical spectral marks equally spaced by a frequency in the microwave or the radio frequency domain, optical frequency combs have been used not only to synthesize optical frequencies from microwave references but also to generate ultralow-noise microwaves via optical frequency division. Here, we combine two compact frequency combs, namely, a soliton microcomb and a semiconductor gain-switched comb, to demonstrate low-noise microwave generation based on a novel frequency division technique. Using a semiconductor laser that is driven by a sinusoidal current and injection-locked to microreso
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6

Diddams, Scott A., Kerry Vahala, and Thomas Udem. "Optical frequency combs: Coherently uniting the electromagnetic spectrum." Science 369, no. 6501 (2020): eaay3676. http://dx.doi.org/10.1126/science.aay3676.

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Optical frequency combs were introduced around 20 years ago as a laser technology that could synthesize and count the ultrafast rate of the oscillating cycles of light. Functioning in a manner analogous to a clockwork of gears, the frequency comb phase-coherently upconverts a radio frequency signal by a factor of ≈105 to provide a vast array of evenly spaced optical frequencies, which is the comb for which the device is named. It also divides an optical frequency down to a radio frequency, or translates its phase to any other optical frequency across hundreds of terahertz of bandwidth. We revi
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7

Saitoh, T., M. Kourogi та M. Ohtsu. "An optical frequency synthesizer using a waveguide-type optical frequency comb generator at 1.5-μm wavelength". IEEE Photonics Technology Letters 8, № 11 (1996): 1543–45. http://dx.doi.org/10.1109/68.541577.

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8

SHIODA, Tatsutoshi. "Femtosecond Optical Arbitrary Waveform Control Based on Ultrafast Optical Frequency Comb Synthesizer and Analyzer." Review of Laser Engineering 42, no. 9 (2014): 722. http://dx.doi.org/10.2184/lsj.42.9_722.

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9

Mosca, Simona, Tobias Hansson, and Maria Parisi. "Spectral Broadening in a Continuously Pumped Singly Resonant Second-Harmonic Cavity." Applied Sciences 11, no. 15 (2021): 7122. http://dx.doi.org/10.3390/app11157122.

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Optical frequency comb synthesizers with a wide spectral range are an essential tool for many research areas such as spectroscopy, precision metrology, optical communication, and sensing. Recent studies have demonstrated the direct generation of frequency combs, via second-order processes, that are centered on two different spectral regions separated by an octave. Here, we present the capability of optical quadratic frequency combs for broad-bandwidth spectral emission in unexplored regimes. We consider comb formation under phase-matched conditions in a continuous-wave pumped singly resonant s
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10

Choi, Samuel, Ken Kasiwagi, Yosuke Kasuya, Shuto Kojima, Tatsutoshi Shioda, and Takashi Kurokawa. "Multi-gigahertz frequency comb-based interferometry using frequency-variable supercontinuum generated by optical pulse synthesizer." Optics Express 20, no. 25 (2012): 27820. http://dx.doi.org/10.1364/oe.20.027820.

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11

SHIODA, Tatsutoshi. "Optical Frequency Comb Synthesizer & Analyzer Applied to Ultrafast Optical Waveform Control and Dispersion Measurement." Review of Laser Engineering 46, no. 2 (2018): 73. http://dx.doi.org/10.2184/lsj.46.2_73.

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12

Ataie, Vahid, Eduardo Temprana, Lan Liu, et al. "Ultrahigh Count Coherent WDM Channels Transmission Using Optical Parametric Comb-Based Frequency Synthesizer." Journal of Lightwave Technology 33, no. 3 (2015): 694–99. http://dx.doi.org/10.1109/jlt.2015.2388579.

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13

Bellini, Marco, and Theodor W. Hänsch. "Phase-locked white-light continuum pulses: toward a universal optical frequency-comb synthesizer." Optics Letters 25, no. 14 (2000): 1049. http://dx.doi.org/10.1364/ol.25.001049.

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14

Yamagiwa, Masatomo, Takeo Minamikawa, Clément Trovato, et al. "Multicascade-linked synthetic wavelength digital holography using an optical-comb-referenced frequency synthesizer." Optics Express 26, no. 20 (2018): 26292. http://dx.doi.org/10.1364/oe.26.026292.

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15

Mouret, Gaël, Francis Hindle, Arnaud Cuisset, et al. "THz photomixing synthesizer based on a fiber frequency comb." Optics Express 17, no. 24 (2009): 22031. http://dx.doi.org/10.1364/oe.17.022031.

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16

Sultana, Nasrin, Hiroaki Tada, Hayate Imai, and Tatsutoshi Shioda. "Dispersion pre-compensation of 25.6 Tbps waveforms using an optical frequency comb synthesizer/analyzer." Optics Communications 475 (November 2020): 126196. http://dx.doi.org/10.1016/j.optcom.2020.126196.

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17

Moritsuka, Fumi, Naoya Wada, Takahide Sakamoto, et al. "Multiple optical code-label processing using multi-wavelength frequency comb generator and multi-port optical spectrum synthesizer." Optics Express 15, no. 12 (2007): 7515. http://dx.doi.org/10.1364/oe.15.007515.

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18

Mosca, Simona, Iolanda Ricciardi, Maria Parisi та ін. "Direct generation of optical frequency combs in χ(2) nonlinear cavities". Nanophotonics 5, № 2 (2016): 316–31. http://dx.doi.org/10.1515/nanoph-2016-0023.

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AbstractQuadratic nonlinear processes are currently exploited for frequency comb transfer and extension from the visible and near infrared regions to other spectral ranges where direct comb generation cannot be accomplished. However, frequency comb generation has been directly observed in continuously pumped quadratic nonlinear crystals placed inside an optical cavity. At the same time, an introductory theoretical description of the phenomenon has been provided, showing a remarkable analogy with the dynamics of third-order Kerr microresonators. Here, we give an overview of our recent work on χ
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19

Hussein, Hatem, Niveen Farid, and Osama Terra. "Absolute gauge block calibration using ultra-precise optical frequency synthesizer locked to a femtosecond comb." Applied Optics 54, no. 4 (2015): 622. http://dx.doi.org/10.1364/ao.54.000622.

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20

Park, S. E., E. B. Kim, Y. H. Park, et al. "Sweep optical frequency synthesizer with a distributed-Bragg-reflector laser injection locked by a single component of an optical frequency comb." Optics Letters 31, no. 24 (2006): 3594. http://dx.doi.org/10.1364/ol.31.003594.

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21

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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22

Di Gaspare, Alessandra, Leonardo Viti, Harvey E. Beere, David D. Ritchie, and Miriam S. Vitiello. "Homogeneous quantum cascade lasers operating as terahertz frequency combs over their entire operational regime." Nanophotonics 10, no. 1 (2020): 181–86. http://dx.doi.org/10.1515/nanoph-2020-0378.

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AbstractWe report a homogeneous quantum cascade laser (QCL) emitting at terahertz (THz) frequencies, with a total spectral emission of about 0.6 THz, centered around 3.3 THz, a current density dynamic range Jdr = 1.53, and a continuous wave output power of 7 mW. The analysis of the intermode beatnote unveils that the devised laser operates as an optical frequency comb (FC) synthesizer over the whole laser operational regime, with up to 36 optically active laser modes delivering ∼200 µW of optical power per optical mode, a power level unreached so far in any THz QCL FC. A stable and narrow sing
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23

Gravina, S., C. Clivati, N. A. Chishti, et al. "Comb-assisted mercury spectroscopy in the deep-ultraviolet: towards the development of a new primary thermometer." Journal of Physics: Conference Series 2439, no. 1 (2023): 012015. http://dx.doi.org/10.1088/1742-6596/2439/1/012015.

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Abstract We report on the development of a new primary thermometer based upon high-precision spectroscopy of mercury vapors in the deep-ultraviolet region for the practical realization of the new kelvin. The line profile of the (6s 2)1 S 0 → (6s6p)3 P 1 intercombination transition of the 200Hg bosonic isotope is observed with a high spectral fidelity using a coherent radiation source at 253.7 nm. This latter consists of a near-IR external cavity diode laser followed by a double-stage second-harmonic generation apparatus. Metrology grade UV spectroscopy is demonstrated by locking the diode lase
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24

Musha, Mitsuru, Akitoshi Ueda, Munekazu Horikoshi, et al. "A highly stable mm-wave synthesizer realized by mixing two lasers locked to an optical frequency comb generator." Optics Communications 240, no. 1-3 (2004): 201–8. http://dx.doi.org/10.1016/j.optcom.2004.06.028.

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25

Hänsch, T. W., J. Alnis, P. Fendel, et al. "Precision spectroscopy of hydrogen and femtosecond laser frequency combs." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 363, no. 1834 (2005): 2155–63. http://dx.doi.org/10.1098/rsta.2005.1639.

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Precision spectroscopy of the simple hydrogen atom has inspired dramatic advances in optical frequency metrology: femtosecond laser optical frequency comb synthesizers have revolutionized the precise measurement of optical frequencies, and they provide a reliable clock mechanism for optical atomic clocks. Precision spectroscopy of the hydrogen 1S–2S two-photon resonance has reached an accuracy of 1.4 parts in 10 14 , and considerable future improvements are envisioned. Such laboratory experiments are setting new limits for possible slow variations of the fine structure constant α and the magne
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26

Eugenio, Fasci, Asad Khan Muhammad, D'Agostino Vittorio, et al. "Water vapor concentration measurements in high purity gases by means of comb assisted cavity ring down spectroscopy." Sensors and Actuators A: Physical 362, no. 1 November 2023 (2023): 114632. https://doi.org/10.1016/j.sna.2023.114632.

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In manufacturing processes of semiconductor industry accurate detection and monitoring of water vapor concentration in trace amount is of great importance. The ability to perform reliable measurements in ultrapure gases, with a wide dynamic range and low uncertainty, can have a substantial impact on product quality and process performances. Here, we report on the development of a second-generation comb-assisted cavity ring-down spectrometer and present H2O mole fraction measurements in high-purity N2 gas. Based on the use of a pair of phase-locked lasers and referenced to an optical frequency
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27

Hsieh, Yi-Da, Hiroto Kimura, Kenta Hayashi, et al. "Terahertz Frequency-Domain Spectroscopy of Low-Pressure Acetonitrile Gas by a Photomixing Terahertz Synthesizer Referenced to Dual Optical Frequency Combs." Journal of Infrared, Millimeter, and Terahertz Waves 37, no. 9 (2016): 903–15. http://dx.doi.org/10.1007/s10762-016-0277-6.

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28

Golovin, Nikolai N., and Alexander K. Dmitriev. "Pulse selector for obtaining femtosecond radiation with a controlled carrier-envelope phase." Analysis and data processing systems, no. 2 (June 28, 2022): 121–32. http://dx.doi.org/10.17212/2782-2001-2022-2-121-132.

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In non-linear optical processes, such as obtaining attosecond pulses, it is extremely important to control the carrier envelope phase. To do this, various periodic trains of identical femtosecond pulses with a controlled phase can be created. In addition, since there is no frequency comb offset in such sequences, the process of measuring optical frequencies is greatly simplified. The pulse selector has been developed to obtain a sequence of identical femtosecond pulses with a controlled carrier – envelope phase. The selector makes it possible to obtain a “pure” sequence of identical femtosecon
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29

Liu, Li, Yangguang Liu, Xiao-Zhi Gao, and Xiaomin Zhang. "Flexible Ultra-Wide Electro-Optic Frequency Combs for a High-Capacity Tunable 5G+ Millimeter-Wave Frequency Synthesizer." Applied Sciences 11, no. 22 (2021): 10742. http://dx.doi.org/10.3390/app112210742.

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This paper presents a new scheme of a cost-effective tunable millimeter-wave (MMW) frequency synthesizer based on an ultra-wideband electro-optic frequency comb. The architecture for the quasi-tunable millimeter-wave frequency synthesizer mainly consists of a compact ultra-wide flat electro-optic frequency comb and a multi-tone frequency generator, which only includes a quantum dot mode-locked laser, a LiNbO3 dual-driving Mach–Zehnder modulator (DD-MZM) and Uni-traveling-carrier photodiode (UTC-PD). MMW signals generated with a quasi-tunable frequency are experimentally demonstrated. The diffe
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30

Singh, Neetesh, Ming Xin, Nanxi Li, et al. "Silicon Photonics Optical Frequency Synthesizer." Laser & Photonics Reviews 14, no. 7 (2020): 1900449. http://dx.doi.org/10.1002/lpor.201900449.

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31

Nikas, Thomas, Evangelos Pikasis, Adonis Bogris, and Dimitris Syvridis. "A Microwave Optoelectronic PLL Synthesizer Based on Optical Comb Reference." IEEE Photonics Technology Letters 31, no. 8 (2019): 623–26. http://dx.doi.org/10.1109/lpt.2019.2901871.

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32

Foltynowicz, A., P. Masłowski, T. Ban, et al. "Optical frequency comb spectroscopy." Faraday Discussions 150 (2011): 23. http://dx.doi.org/10.1039/c1fd00005e.

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33

Xuezhi Chen, 陈学智, 姚远 Yuan Yao, 蒋燕义 Yanyi Jiang, and 马龙生 Longsheng Ma. "Automatic Control of Optical Frequency Synthesizer." Acta Optica Sinica 39, no. 7 (2019): 0714005. http://dx.doi.org/10.3788/aos201939.0714005.

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34

Holzwarth, R., Th Udem, T. W. Hänsch, J. C. Knight, W. J. Wadsworth, and P. St J. Russell. "Optical Frequency Synthesizer for Precision Spectroscopy." Physical Review Letters 85, no. 11 (2000): 2264–67. http://dx.doi.org/10.1103/physrevlett.85.2264.

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35

Hu, Hao, and Leif K. Oxenløwe. "Chip-based optical frequency combs for high-capacity optical communications." Nanophotonics 10, no. 5 (2021): 1367–85. http://dx.doi.org/10.1515/nanoph-2020-0561.

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AbstractCurrent fibre optic communication systems owe their high-capacity abilities to the wavelength-division multiplexing (WDM) technique, which combines data channels running on different wavelengths, and most often requires many individual lasers. Optical frequency combs, with equally spaced coherent comb lines derived from a single source, have recently emerged as a potential substitute for parallel lasers in WDM systems. Benefits include the stable spacing and broadband phase coherence of the comb lines, enabling improved spectral efficiency of transmission systems, as well as potential
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36

Spencer, Daryl T., Tara Drake, Travis C. Briles, et al. "An optical-frequency synthesizer using integrated photonics." Nature 557, no. 7703 (2018): 81–85. http://dx.doi.org/10.1038/s41586-018-0065-7.

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37

Kiuchi, Hitoshi, Tetsuya Kawanishi, and Atsushi Kanno. "Wide Frequency Range Optical Synthesizer With High-Frequency Resolution." IEEE Photonics Technology Letters 29, no. 1 (2017): 78–81. http://dx.doi.org/10.1109/lpt.2016.2628905.

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38

Chang, Lin, Songtao Liu, and John E. Bowers. "Integrated optical frequency comb technologies." Nature Photonics 16, no. 2 (2022): 95–108. http://dx.doi.org/10.1038/s41566-021-00945-1.

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39

Bell, A. S., G. M. Mcfarlane, E. Riis, and A. I. Ferguson. "Efficient optical frequency-comb generator." Optics Letters 20, no. 12 (1995): 1435. http://dx.doi.org/10.1364/ol.20.001435.

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40

Sadiek, Ibrahim, Tommi Mikkonen, Markku Vainio, Juha Toivonen, and Aleksandra Foltynowicz. "Optical frequency comb photoacoustic spectroscopy." Physical Chemistry Chemical Physics 20, no. 44 (2018): 27849–55. http://dx.doi.org/10.1039/c8cp05666h.

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41

Papp, Scott B., Katja Beha, Pascal Del’Haye, et al. "Microresonator frequency comb optical clock." Optica 1, no. 1 (2014): 10. http://dx.doi.org/10.1364/optica.1.000010.

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42

Horiuchi, Noriaki. "Chip-scale frequency synthesizer." Nature Photonics 11, no. 3 (2017): 141. http://dx.doi.org/10.1038/nphoton.2017.26.

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43

Jin, Ziyi, Dongrui Yu, Ziyang Chen, and Hong Guo. "Synergetic Repetition Frequency Locking of an Optical Frequency Comb." Journal of Physics: Conference Series 2889, no. 1 (2024): 012030. http://dx.doi.org/10.1088/1742-6596/2889/1/012030.

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Abstract This paper proposes a method to achieve long-term locking of the repetition frequency of the optical frequency comb under severe temperature fluctuations by cooperatively adjusting the cavity length of the resonator using piezoelectric ceramic, temperature control module, and delay line module. This method enhances the practicability and usability of optical frequency comb at a low cost.
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44

MASUOKA, Takashi, Takashi OGURA, Takeo MINAMIKAWA, et al. "Optical ultrasonic imaging with optical frequency comb." Proceedings of the JSME Conference on Frontiers in Bioengineering 2017.28 (2017): 1B16. http://dx.doi.org/10.1299/jsmebiofro.2017.28.1b16.

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45

Aumiler, D., T. Ban, N. Vujičić, S. Vdović, H. Skenderović, and G. Pichler. "Characterization of an optical frequency comb using modified direct frequency comb spectroscopy." Applied Physics B 97, no. 3 (2009): 553–60. http://dx.doi.org/10.1007/s00340-009-3630-9.

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46

Matsumoto, Hirokazu. "In-Situ Interferometric Metrology with Optical Comb." Journal of Electrical Electronics Engineering 4, no. 1 (2025): 01–10. https://doi.org/10.33140/jeee.04.01.02.

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Optical frequency comb has various characteristics such as short pulse, broad spectra, many spectral lines, and high temporal coherency. In this paper, historical progress of the optical frequency comb is introduced in the metrology field and its temporalcoherence inteferometric applications are discussed for optical metrology. Specially, in-situ length metrology is presented on new measurement applications using the characteristics of the repetition frequency, brad spectra and high accuracy of the optical frequency comb.
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47

Sharma, Vishal, Surinder Singh, and Lovkesh. "Development of frequency comb generation by spectral broadening of periodic optical pulses in semiconductor laser amplifiers." Journal of Optics 24, no. 4 (2022): 045701. http://dx.doi.org/10.1088/2040-8986/ac4c86.

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Abstract This paper reports an approach for generating an ultra-flat and ultra-wide optical frequency comb by exploiting gain modulation, experienced by a periodic third ordered Gaussian-shaped optical pulse propagating through the semiconductor optical amplifier (SOA). The gain experienced by optical signal propagating inside SOA is independent of its polarization state and phase, makes the technique more favorable and stable to the optical frequency comb generation. This paper reports a 94-line optical frequency comb with 5 dB maximum power deviation and a 190-line optical frequency comb wit
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48

Soboń, G., and K. M. Abramski. "Fiber-based laser frequency combs." Bulletin of the Polish Academy of Sciences: Technical Sciences 60, no. 4 (2012): 697–706. http://dx.doi.org/10.2478/v10175-012-0081-y.

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Abstract For the last decade a very attractive field of laser physics, namely the optical frequency comb technique, has been intensively developed. Fiber lasers play particular role in that area. The motivation of their development is obtaining broadband comb systems with well-defined and stable mods (comb teeth). This paper presents a basic overview devoted to the fiber-based optical frequency combs.
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49

Choi, Samuel, Naoyuki Tamura, Ken Kashiwagi, Tatsutoshi Shioda, Yosuke Tanaka, and Takashi Kurokawa. "Supercontinuum Comb Generation Using Optical Pulse Synthesizer and Highly Nonlinear Dispersion-Shifted Fiber." Japanese Journal of Applied Physics 48, no. 9 (2009): 09LF01. http://dx.doi.org/10.1143/jjap.48.09lf01.

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50

Molteni, Lisa M., Francesco Canella, Federico Pirzio, et al. "Low-noise Yb:CALGO optical frequency comb." Optics Express 29, no. 13 (2021): 19495. http://dx.doi.org/10.1364/oe.428603.

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