[1] [1] H R Gray, R M Whitley, C R Stroud. Coherent trapping of atomic population[J]. Opt Lett, 1978, 3(6): 218-220.

[2] [2] E Arimondo. Coherent population trapping in laser spectroscopy[J]. Progress in Optics, 1996, 35: 259-288.

[3] [3] Du Runchang, Liu Guobin, Chen Jiehua, et al.. Realization and investigation of relative experimental parameter of coherent population trapping frequency standard[J]. Spectroscopy and Spectral Analysis, 2008, 28(8): 1697-1700.

[4] [4] J Vanier. Coherent population trapping for the realization of a small, stable, atomic clock[C]. IEEE International Frequency Control Symposium and PDA Exhibition, 2002, 424-434.

[5] [5] D Natale, J F Borwick, R L Tsai, et al.. Compact, low-power chip-scale atomic clock[C]. Position, Location and Navigation Symposium, 2008. 67-70.

[6] [6] Zhang Yi, Gu Sihong, Ye Chaohui. The algorithm and implementation of digital quadrature demodulation in CPT atomic clock system[J]. Acta Metrologica Sinica, 2010, 31(2): 145-149.

[7] [7] Chen Jiehua, Du Runchang, Zhao Jiecheng, et al.. The characteristics of vertical cavity surface emitting laser by laser spectroscopy[J]. Chinese J Lasers, 2010, 37(10): 2515-2519.

[8] [8] Yu Zhenzhen, Hou Xia, Zhou Qunli, et al.. VCSEL pumped compact wide-temperature Nd:YAG laser and grazing-incidence amplifier[J]. Chinese J Lasers, 2013, 40(6): 0602003.

[9] [9] Zhang Peng, Dai Teli, Liang Yiping, et al.. Optimization of pump pulses in a vertical-external-cavity surface-emitting laser[J]. Chinese J Lasers, 2013, 40(4): 0402001.

[10] [10] Wang Wei, Ning Yongqiang, Zhang Jinlong, et al.. Polarization properties of high-power vertical-cavity bottom-emitting lasers[J]. Chinese J Lasers, 2012, 39(3): 0302002.

[11] [11] F Levi, A Godone, J Vanier. The light shift effect in the coherent population trapping cesium maser[J]. IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, 2000, 47(2): 466-470.

[12] [12] Y Hu. CORDIC-based VLSI architectures for digital signal processing[J]. IEEE Signal Processing Magazine, 1992, 9(3): 16-35.

[13] [13] B H McGuyer, Y Y Jau, W Happer. Simple method of light-shift suppression in optical pumping system[J]. Applied Physics Letters, 2009, 94(25): 251110.