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absorption achieved amplifier Appl array bandwidth beam birefringence cavity Center cross talk crystal demonstrated density devices diffraction diode lasers diode-pumped doped E-mail efficiency Electrical electro-optic emission energy experimental setup femtosecond fiber laser field Figure 1 shows filter frequency function FWHM GaAs gain grating high-power InGaAs input intensity Laboratory laser diode laser pulses laser pumped lasing layer length Lett material measured mirror mode mode-locked modulation Nd:YAG nonlinear nonlinear optical obtained operation optical parametric oscillator oscillator output coupler output power parametric peak periodically poled phase Photonics photorefractive Phys polarization PPLN probe pump power Q-switched Quantum Electron radiation range region repetition rate resonant sample Schematic second-harmonic semiconductor Series Optical Society shown in Fig signal slope efficiency spatial spectral spectrum structure substrate technique Technol Technology temperature terahertz thermal threshold Ti:sapphire tion tunable tuning ultrafast University VCSEL wave waveguide wavelength width