[1] Liu P, Cheng H D, Meng Y L et al. Research on phase modulation of Ramsey fringes in integrating sphere cold atom clocks[J]. Chinese Journal of Lasers, 43, 1112001(2016).

[2] Yu M Y, Cheng H D, Meng Y L et al. An integrated laser system for the cold atom clock[J]. The Review of Scientific Instruments, 90, 053203(2019).

[3] Ouyang X C, Yang B W, Hu Q Q et al. Distortion of Rabi oscillations in a compact cold-atom clock[J]. Physical Review A, 103, 043118(2021).

[4] Wang X M, Meng Y L, Li L et al. Frequency and intensity noises of probe laser in integrating sphere cold atom clock[J]. Chinese Journal of Lasers, 44, 0912001(2017).

[5] Hänsch T W, Levenson M D, Schawlow A L. Complete hyperfine structure of a molecular iodine line[J]. Physical Review Letters, 26, 946-949(1971).

[6] Preston D W. Doppler-free saturated absorption: laser spectroscopy[J]. American Journal of Physics, 64, 1432-1436(1996).

[7] Ji J W, Cheng H N, Zhang Z et al. Automatic laser frequency stabilization system for transportable 87Rb fountain clock[J]. Acta Optica Sinica, 40, 2214002(2020).

[8] Black E D. An introduction to Pound-Drever-Hall laser frequency stabilization[J]. American Journal of Physics, 69, 79-87(2001).

[9] Su J, Jiao M X, Jiang F et al. Laser frequency locking system using orthogonally demodulated Pound-Drever-Hall method[J]. Proceedings of SPIE, 11053, 110531B(2019).

[10] Yao B, Chen Q F, Chen Y J et al. 280 mHz linewidth DBR fiber laser based on PDH frequency stabilization with ultrastable cavity[J]. Chinese Journal of Lasers, 48, 0501014(2021).

[11] Negnevitsky V, Turner L D. Wideband laser locking to an atomic reference with modulation transfer spectroscopy[J]. Optics Express, 21, 3103-3113(2013).

[12] Han Y S, Wen X, Bai J D et al. Laser frequency stabilization of 1560 nm laser after frequency doubling to 780 nm with a waveguide: radio-frequency frequency-modulation spectroscopy versus modulation transfer spectroscopy with Rb atoms[J]. Acta Optica Sinica, 34, 0530002(2014).

[13] Ru N, Wang Y, Ma H J et al. Flexible control of semiconductor laser with frequency tunable modulation transfer spectroscopy[J]. Chinese Physics B, 27, 074201(2018).

[14] Luan G J, Mao H C, Shi X H. Method for modulating transfer spectrally stabilized laser frequency based on Rb87[J]. Optics & Optoelectronic Technology, 18, 83-86(2020).

[15] Hong Y, Hou X, Chen D J et al. Research on frequency stabilization technology of modulation transfer spectroscopy based on Rb87[J]. Chinese Journal of Lasers, 48, 2101003(2021).

[16] Wu B, Zhou Y, Weng K X et al. Modulation transfer spectroscopy for D1 transition line of rubidium[J]. Journal of the Optical Society of America B, 35, 2705-2710(2018).

[17] Yu X, Lü M J, Zhang X et al. Research on frequency locking of 1560 nm fiber laser based on rubidium atomic modulation transfer spectroscopy technology[J]. Chinese Journal of Lasers, 49, 0301002(2022).

[18] Kobayashi S, Yamamoto Y, Ito M et al. Direct frequency modulation in AlGaAs semiconductor lasers[J]. IEEE Journal of Quantum Electronics, 18, 582-595(1982).

[19] HäNsch T W, Shahin I S, Schawlow A L. Lines with a pulsed tunable dye laser[J]. Physical Review Letters, 27, 707-710(1971).

[20] Shirley J H. Modulation transfer processes in optical heterodyne saturation spectroscopy[J]. Optics Letters, 7, 537-539(1982).

[21] Zhang J, Wei D, Xie C D et al. Characteristics of absorption and dispersion for rubidium D2 lines with the modulation transfer spectrum[J]. Optics Express, 11, 1338-1344(2003).