[1] Peng Tianduo, Liu Bowen, Zhang Juhui, et al. Generation of few-cycle femtosecond pulses via coherent synthesis based on self-frequency-shifted solitons in all-solid-state photonic bandgap fiber[J]. Chinese J Lasers, 2015, 42(7): 0702006.
[2] Ren Jun, Wu Sida, Cheng Zhaochen, et al. Mode-locked femtosecond erbium-doped fiber laser based on graphene oxide versus semiconductor saturable absorber mirror[J]. Chinese J Lasers, 2015, 42(6): 0602013.
[3] Wang X, Yan L, Si J, et al. High-frame-rate observation of single femtosecond laser pulse propagation in fused silica using an echelon and optical polarigraphy technique[J]. Appl Opt, 2014, 53(36): 8395-8399.
[4] Yu H, Wang X, Zhang H, et al. Linearly-polarized fiber-integrated nonlinear CPA system for high-average-power femtosecond pulses generation at 1. 06 μm[J]. J Lightwave Technol, 2016, 34(18): 4271-4277.
[5] Yang Chunhui, Sun Liang, Leng Xuesong, et al. Photorefractive nonlinear optical material lithium niobate crystal[M]. Beijing: Science Press, 2009: 237.
[6] Mizuuchi K, Yamamoto K, Kato M, et al. Broadening of the phase-matching bandwidth in quasi-phase-matched second-harmonic generation[J]. IEEE J Quantum Electron, 1994, 30(7): 1596-1604.
[7] Bortz M L, Fujimura M, Fejer M M. Increased acceptance bandwidth for quasi-phase-matched second harmonic generation in LiNbO3 waveguides[J]. Electron Lett, 1994, 30(1): 34-35.
[8] Fujioka N, Ashihara S, Ono H, et al. Group-velocity-matched noncollinear second-harmonic generation in quasi-phase matching[J]. J Opt Soc Am B, 2005, 22(6): 1283-1289.
[9] Das R, Thyagarajan K. Broadening of the phase-matching bandwidth in quasi-phase-matched second-harmonic generation using GaN-based bragg reflection waveguide[J]. Opt Lett, 2007, 32(21): 3128-3130.
[10] Chen L, Lu S, Wang Y, et al. Bandwidth broadening and spectrum tailoring of second-harmonic generation in transversely nonuniform quasi-phase-matching gratings with spatial spectral dispersion[J]. Optik, 2015, 126: 5149-5153.
[11] Yu N E, Ro J H, Cha M, et al. Broadband quasi-phase-matched second-harmonic generation in MgO-doped periodically poled LiNbO3 at the communications band[J]. Opt Lett, 2002, 27(12): 1046-1048.
[12] Yu N E, Kurimura S, Kitamura K, et al. Efficient frequency doubling of a femtosecond pulse with simultaneous group-velocity matching and quasi phase matching in periodically poled, MgO-doped lithium niobate[J]. Appl Phys Lett, 2003, 82(20): 3388-3390.
[13] Zhang J, Chen Y, Lu F, et al. Effect of MgO doping of periodically poled lithium niobate on second-harmonic generation of femtosecond laser pulses[J]. Appl Opt, 2007, 46(32): 7792-7796.
[14] Zhang J, Chen Y, Lu F, et al. Flexible wavelength conversion via cascaded second order nonlinearity using broadband SHG in MgO-doped PPLN[J]. Opt Express, 2008, 16(10): 6957-6962.
[15] Zheng Z, Weiner A M, Parameswaran K R, et al. Femtosecond second-harmonic generation in periodically poled lithium niobate waveguides with simultaneous strong pump depletion and group-velocity walk-off[J]. J Opt Soc Am B, 2002, 19(4): 839-848.
[16] Zelmon D E, Small D L, Jundt D. Infrared corrected Sellmeier coefficients for congruently grown lithium niobate and 5 mol.% magnesium oxide-doped lithium niobate[J]. J Opt Soc Am B, 1997, 14(12): 3319-3322.