[1] Lee K, Lee J, Jang Y S, et al. Fourier-transform spectroscopy using an Er-doped fiber femtosecond laser by sweeping the pulse repetition rate [J]. Sci Rep, 2015, 5: 15726. doi:  10.1038/srep15726
[2] Ye Jun. Absolute measurement of a long, arbitrary distance to less than an optical fringe [J]. Opt Lett, 2004, 29(10): 1153-1155. doi:  10.1364/OL.29.001153
[3] Kray S, Spöler F, Hellerer T, et al. Electronically controlled coherent linear optical sampling for optical coherence tomography [J]. Opt Express, 2010, 18(10): 9976-9990. doi:  10.1364/OE.18.009976
[4] Oh J S, Kim S W. Femtosecond laser pulses for surface-profile metrology [J]. Opt Lett, 2005, 30(19): 2650-2652. doi:  10.1364/OL.30.002650
[5] Wu H Z, Zhang F M, Liu T Y, et al. Absolute distance measurement using optical sampling by cavity tuning [J]. IEEE Photonics Technol Lett, 2016, 28(12): 1275-1278. doi:  10.1109/LPT.2016.2538266
[6] Villares G, Hugi A, Blaser S, et al. Dual-comb spectroscopy based on quantum-cascade-laser frequency combs [J]. Nat Commun, 2014, 5: 5192. doi:  10.1038/ncomms6192
[7] Joo W D, Kim S, Park J, et al. Femtosecond laser pulses for fast 3-D surface profilometry of microelectronic step-structures [J]. Opt Express, 2013, 21(13): 15323-15334. doi:  10.1364/OE.21.015323
[8] Schibli T R, Hartl I, Yost D C, et al. Optical frequency comb with submillihertz linewidth and more than 10 W average power [J]. Nat Photonics, 2008, 2(6): 355-359. doi:  10.1038/nphoton.2008.79
[9] Hudson D D, Holman K W, Jones R J, et al. Mode-locked fiber laser frequency-controlled with an intracavity electro-optic modulator [J]. Opt Lett, 2005, 30(21): 2948-2950. doi:  10.1364/OL.30.002948
[10] Park J, Kim S, Kim B S, et al. Tuning range extension of pulse repetition rate using chirped fiber Bragg gratings [J]. Opt Express, 2017, 25: 1413-1420. doi:  10.1364/OE.25.001413
[11] Hundertmark H, Kracht D, Engelbrecht M, et al. Stable sub-85 fs passively mode-locked Erbium-fiber oscillator with tunable repetition rate [J]. Opt Express, 2004, 12: 3178-3183. doi:  10.1364/OPEX.12.003178
[12] Washburn B, Fox R, Newbury N, et al. Fiber-laser-based frequency comb with a tunable repetition rate [J]. Opt. Express, 2004, 12: 4999-5004. doi:  10.1364/OPEX.12.004999
[13] Wu X J, Yang L J, Zhang H Y, et al. Hybrid mode-locked Er-fiber oscillator with a wide repetition rate stabilization range [J]. Appl Opt, 2015, 54(7): 1681. doi:  10.1364/AO.54.001681
[14] Yang H L, Wei H Y, Chen K, et al. Simply-integrated dual-comb spectrometer via tunable repetition rates and avoiding self-referencing [J]. Opt Express, 2017, 25(7): 8063-8072. doi:  10.1364/OE.25.008063
[15] Wise F W, Chong A, Renninger W H. High-energy femtosecond fiber lasers based on pulse propagation at normal dispersion [J]. Laser & Photon Rev, 2008, 2(1-2): 58-73. doi:  10.1002/lpor.200710041