[1] [1] Florian Adler, Konstantinos Moutzouris, Alfred Leitenstorfer, et al.. Phase-locked two-branch erbium-doped fiber laser system forlong-term precision measurements of optical frequencies[J]. Optics Express, 2004, 12(24): 5872-5880.

[2] [2] Ryu H Y, Lee S H, Lee W K, et al.. Absolute frequency measurement of an acetylene stabilized laser using a selected single modefrom a femtosecond fiber laser comb[J]. Opt Express, 2008, 16(5): 2867-2873.

[3] [3] H S Margolis, G P Barwood, G Huang, et al.. Hertz-level measurement of the optical clock frequency in a single 88Sr + ion[J]. Science, 2004, 306(5700): 1355-1358.

[4] [4] Lin Baike, Cao Shiying, Zhao Yang, et al.. A compact iodine-stabilized solid-state laser at 532nm[J]. Chinese J Lasers, 2014, 41(9):0902002.

[5] [5] Lin Yige, Wang Qiang, Li Ye, et al.. Magnetic field induced spectroscopy of 88Sr atoms probed with a 10 Hz linewidth laser[J]. ChinPhys Lett, 2013, 30(1): 014206.

[6] [6] Zhao Yang, Li Ye, Peng Yu, et al.. Stable second harmonic generation 461 nm blue radiationby PPK TP crystal[J]. Acta OpticaSinica, 2009, 29(9): 2473-2478.

[7] [7] Meng Fei, Cao Shiying, Cai Yue, et al.. Study of the femtosecond fiber comb and absolute optical frequency measurement[J]. ActaPhys Sin, 2011, 60(10): 100601.

[8] [8] Cao Shiying, Meng Fei, Lin Baike, et al.. Precise frequency control of an Er-doped fiber comb[J]. Acta Phys Sin, 2012, 61(13):134205.

[9] [9] Cao Shiying, Meng Fei, Lin Baike, et al.. Experimental study on detection of the high signal-to-noise ratio of the carrier-envelopeoffset frequency in an Er-doped fiber femtosecond laser[J]. Acta Phys Sin, 2012, 61(6): 064208.

[10] [10] Li Luming, Tang Wenzhuo, Hu Zhenyan, et al.. Realization of optical phase locked loop at 9.2 GHz between two independent diodelasers[J]. Chin Phys Lett, 2008, 25(9): 3253-3256.