[1] Li Tianchu, Qian Jin, Zhang Xiaoping, et al. The linear absorption frequency stabilization of 1.5 μm Acetylene (¹²C₂H₂) of DFB-LD at NIM[J]. Acta Metrologica Sinica, 161-163(2001).

[2] Zhang Jing, Tao Ye, Wei Dong, et al. A laser diode system stabilized on the saturated absorption lines of rubidium atoms[J]. Acta Optica Sinica, 197-201(2003).

[3] Jin Jie, Zhang Jianwei, Yang Yu, et al. ECDL at 1.5μm with acetylene saturated-absorption frequency stabilization[J]. Laser Technology, 31, 341-343(2007).

[4] Drever R W P, Hall J L, Kowalski F V, et al. Laser Phase and Frequency Stabilization Using an Optical Resonator[J]. Applied Physics B, 31, 97-105(1983).

[5] Weiss D S, Young B C, Chu S. Precision measurement of h/m_Cs based on photon recoil using laser-cooled atoms and atomic interferometry[J]. Applied Physics B, 59, 217-256(1994).

[6] Eisaman M D, Andre A, Massou F, et al. Electromagnetically induced transparency with tunable single-photon pulses[J]. Nature, 438, 837-841(2005).

[7] Zhao Hui, Pu Zhaobang, Liu Guodong. High precision straightness device based on double-frequency laser interference technique[J]. Chinese Journal of Lasers, 28, 637-640(2001).

[8] Peng Wencui, Zhou Lin, Long Shitong, et al. Locking laser frequency of up to 40GHz offset to a reference with a 10GHz electro-optic modulator[J]. Optics Letters, 39, 2998-3001(2014).

[9] Li Zhiquan, Chen Xi, Zhu Guofang, et al. Modulation-free frequency locking of a laser based on acousto-optic frequency-shifting method[J]. Opto-Electronic Engineering, 37, 110-114(2010).

[10] Hisai Y, Ikeda K, Sakagami H, et al. Evaluation of laser frequency offset locking using an electrical delay line[J]. Appl Opt, 57, 5628-5634(2018).

[11] Schünemann U, Engler H, Grimmet R, et al. Simple scheme for tunable frequency offset locking of two lasers[J]. Review of Scientific Instruments, 70, 242-243(1999).

[12] Li Yun, Bao Xiaoyi, Ravet F, et al. Distributed Brillouin sensor system based on offset locking of two distributed feedback lasers[J]. Appl Opt, 47, 99-102(2008).

[13] Rutt H N. A heterodyne frequency offset locking technique for pulsed or CW lasers[J]. Journal of Physics E: Scientific Instruments, 17, 704-709(1984).

[14] Wang Hanmu, Cheng Hong, Zhang Shanshan, et al. Laser frequency offset-locking using electromagnetically induced transparency spectroscopy of ⁸⁵Rb in magnetic field[J]. Chinese Physics B, 27, 1-5(2018).

[15] Ying Kang, Niu Yueping, Chen Dijun, et al. Laser frequency offset locking via tripod-type electromagnetically induced transparency[J]. Appl Opt, 53, 2632-2637(2014).

[16] Seishu Y, Hasegawa T. Robust offset locking of laser frequency with electronically tunable LC circuits for sub-millihertz uncertainty[J]. Applied Physics B, 125, 142(2019).

[17] Arafin S, Simsek A, Kim S K, et al. Towards chip-scale optical frequency synthesis based on optical heterodyne phase-locked loop[J]. Opt Express, 25, 681-695(2017).

[18] Balakier K, Shams H, Fice M J, et al. Optical phase lock loop as high-quality tuneable filter for optical frequency comb line selection[J]. Journal of Lightwave Technology, 36, 4646-4654(2019).

[19] Enloe L H, Rodda J L. Laser phase-locked loop[J]. Proceedings of the IEEE, 53, 165-166(1965).

[20] Williams K J, Goldberg L, Esman R D, et al. 6–34 GHz offset phase-locking of Nd: YAG 1319 nm nonplanar ring lasers[J]. Electronics Letters, 25, 1242-1243(1989).

[21] Harrison J, Mooradian A. Linewidth and offset frequency locking of external cavity GaAlAs lasers[J]. IEEE Journal of Quantum Electronics, 25, 1152-1155(1989).

[22] [22] Gliese U, Nielsen T N, Bruun M, et al. Coherent optical generation of a 6 GHz microwave signal with directly phase locked semiconduct DFB lasers[C] European Microwave Conference, 1992.

[23] Sternkopf C, Diethold C, Gerhardt U, et al. Heterodyne interferometer laser source with a pair of two phase locked loop coupled He–Ne lasers by 632.8 nm[J]. Measurement Science and Technology, 23, 1-6(2012).

[24] Marino A M, Stroud C R. Phase-locked laser system for use in atomic coherence experiments[J]. Rev Sci Instrum, 79, 013104(2008).

[25] Höckel D, Scholz M, Benson O. A robust phase-locked diode laser system for EIT experiments in cesium[J]. Applied Physics B, 94, 429-435(2008).

[26] [26] Sternkopf C, Goellner S, Manske E. Frequency stabilization of an externalcavity diode laser by offset frequency looking to a stabilized HeNe laser[C] SPIE Photonics Europe. International Society f Optics Photonics, 2014, 9134: 91341C .

[27] Numata K, Chen J R, Wu S T. Precision and fast wavelength tuning of a dynamically phase-locked widely-tunable laser[J]. Opt Express, 20, 14234-14243(2012).

[28] Xu Z, Zhang X, Huang K, et al. A digital optical phase-locked loop for diode lasers based on field programmable gate array[J]. Rev Sci Instrum, 83, 093104(2012).

[29] [29] Xu Z, Huang K, Lu X. A digital optical phaselocked loop based on field programmable gate array its applications[C] International Conference on Infmation Science. IEEE, 2014.

[30] [30] Yao R, Li Q, Xue K, et al. Investigation on offset frequency locking system f a shtpulse laser[C]Proceedings of SPIE, 2009, 7382: 77.

[31] Xie jiandong, Yan liping, Chenbenyong, et al. Automatic offset-frequency locking of external cavity diode laser in wide wavelength range[J]. Optics and Precision Engineering, 29, 211-219(2021).

[32] Balakier K, Fice M J, Ponnampalam L, et al. Monolithically integrated optical phase lock loop for microwave photonics[J]. Journal of Lightwave Technology, 32, 3893-3900(2014).

[33] [33] Lu M, Park H C, Parker J S, et al. A heterodyne optical phaselocked loop f multiple applications[C]Optical Fiber Communication Conference Exposition the National Fiber Optic Engineers Conference (OFCNFOEC), 2013, IEEE, 2013.

[34] [34] Coldren L A, Lu M, Park H C, et al. New Opptunities f Optical PhaseLocked Loops in Coherent Photonics[C] Optical Fiber Communication Conference & Exposition & the National Fiber Optic Engineers Conference. IEEE, 2013.

[35] Ristic S, Bhardwaj A, Rodwell M J, et al. An optical phase-locked loop photonic integrated circuit[J]. Journal of Lightwave Technology, 28, 526-538(2010).

[36] [36] Ristic S, Bhardwaj A, Rodwell M J, et al. Integrated optical phaselocked loop[C]2009 Conference on Optical Fiber Communication, 2009: 13.

[37] Arafin S, Simsek A, Lu M, et al. Heterodyne locking of a fully integrated optical phase-locked loop with on-chip modulators[J]. Opt Lett, 42, 3745-3748(2017).

[38] Steed R J, Pozzi F, Fice M J, et al. Monolithically integrated heterodyne optical phase-lock loop with RF XOR phase detector[J]. Opt Express, 19, 20048-20053(2011).

[39] Steed R J, Ponnampalam L, Fice M J, et al. Hybrid integrated optical phase-lock loops for photonic terahertz sources[J]. IEEE Journal of Selected Topics in Quantum Electronics, 17, 210-217(2011).

[40] Lu M, Park H, Bloch E, et al. Highly integrated optical heterodyne phase-locked loop with phase/frequency detection[J]. Opt Express, 20, 9736-9741(2012).

[41] Balakier K, Ponnamapalam L, Fice M J, et al. Integrated Semiconductor Laser Optical Phase Lock Loops[J]. IEEE Journal of Selected Topics in Quantum Electronics, 24, 1-12(2017).

[42] Gliese U, Nielsen T N, Bruun M, et al. A wideband heterodyne optical phase-locked loop for generation of 3-18 GHz microwave carriers[J]. IEEE Photonics Technology Letters, 4, 936-938(1992).

[43] Santarelli G, Clairon A, Lea S N, et al. Heterodyne optical phase-locking of extended-cavity semiconductor lasers at 9 GHz[J]. Optics Communications, 104, 339-344(1994).

[44] Langley L N, Elkin M D, Edge C, et al. Packaged semiconductor laser optical phase-locked loop (OPLL) for photonic generation, processing and transmission of microwave signals[J]. IEEE Transactions on Microwave Theory and Techniques, 47, 1257-1264(1999).

[45] [45] Wu Kaiyue. Study on nanometer displacement measurement with laser synthetic wavelength interferometer based on offsetfrequency locking[D]. Hangzhou: Zhejiang SciTech University, 2018. (in Chinese)

[46] Liang W, Yariv A, Kewitsch A, et al. Coherent combining of the output of two semiconductor lasers using optical phase-lock loops[J]. Optics Letters, 32, 370-372(2007).

[47] Liang W, Satyan N, Yariv A, et al. Coherent power combination of two Master-oscillator-power-amplifier (MOPA) semiconductor lasers using optical phase lock loops[J]. Opt Express, 15, 3201-3205(2007).

[48] Guionie M, Frein L, Carre A, et al. Beat note stabilization in dual-polarization DFB fiber lasers by an optical phase-locked loop[J]. Opt Express, 26, 3483-3488(2018).

[49] Wei Chunhua, Yan Shuhua. Simple and robust method for rapid cooling of ⁸⁷Rb to quantum degeneracy[J]. Chinese Physics B, 29, 244-248(2020).

[50] [50] Ashok R, Ananth G S, Gupta S. Optical phaselocked loop based carrier phase recovery compensation f 8PSK coherent optical links[C]2019 Wkshop on Recent Advances in Photonics (WRAP). IEEE, 2020.

[51] Zhu G, Wang Q, Dong H, et al. 80Gb/s clock recovery with phase locked loop based on LiNbO₃ modulators[J]. Opt Express, 12, 3488-3492(2004).

[52] Jhon Y M, Ki H J, Kim S H. Clock recovery from 40 Gbps optical signal with optical phase-locked loop based on a terahertz optical asymmetric demultiplexer[J]. Optics Communications, 220, 315-319(2003).

[53] Kim D H, Kim S H, Jo C H, et al. Ultrahigh-speed clock recovery with optical phase lock loop based on four-wave-mixing in a semiconductor optical amplifier[J]. Optics Communications, 182, 329-334(2000).

[54] [54] Kim D H, Kim S H, Jo C H, et al. 40 GHz optical PLL based on fourwavemixing in a semiconduct optical amplifier[C]1999 IEEE LEOS Annual Meeting Conference Proceedings. LEOS''99. 12th Annual Meeting. IEEE Lasers ElectroOptics Society 1999 Annual Meeting (Cat. No.99CH37009), 1999, 1: 347348.

[55] Okamura Y, Takada A. Simultaneous carrier extraction from wavelength-division-multiplexed phase-conjugated twin waves by using sum-frequency generation with second-order optical nonlinear medium for phase-sensitive optical amplifier repeaters[J]. Japanese Journal of Applied Physics, 58, SJJA04(2019).

[56] Zhao Yi, Tong Shoufeng, Song Yansong, et al. Research progress of optical phase locked loop in space laser communication[J]. Laser & Optoelectronics Progress, 52, 20-28(2015).

[57] Xu Nan, Liu Liren, Liu Dean, et al. Optical phase locked loop in intersatellite coherent optical communication[J]. Laser & Optoelectronics Progress, 45, 25-33(2008).