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absorption achieved amplifier amplitude Appl bandwidth beam birefringence Bragg carrier cavity channel chirp coherence coupler crystal demonstrated density detector device diffraction diode laser dispersion doped E-mail effect Electrical emission experimental femtosecond fiber laser fibre Figure 2 shows filter frequency function GaAs gain grating IEEE imaging input intensity laser diode laser pulses layer length Lett light measured mirror mode mode-locked modulation Nd:YAG nonlinear nonlinear optical obtained operation optical optical fiber oscillator output coupler output power parameters peak periodically poled phase phase-matching photodetector photon Phys polarization PPLN propagation pulse energy pump power Q-switched radiation range refractive index repetition rate resonator sample saturable second harmonic semiconductor shown in Fig signal slope efficiency soliton spatial spectral spectrum structure switching technique Technology temperature thermal threshold tion transmission tunable tuning ultrafast VCSEL wave waveguide Wavelength nm width