High Speed Mechanical Q-switched Laser And High Temperature Refractive Index Dispersion Measurement Of LitaO₃

In the past few decades. Quasi-phase-matched (QPM) theory and optical superlattice techniques have been widely used and achieved great progresses. InnoSlab laser is a kind of newly developed technique. Along the small dimension of the pumping cross section the intensity distribution is Gaussian and along the large dimension the intensity profile is nearly top-hat. It is very suitable to be the pump source of optical superlattice. So we made a high speed short pulse width mechanical Q-switched laser for the future application in the optical superlattice. And we demonstrated broadly tunable OPG using PPCLT at high temperature up to400℃. We only used five channels and realized widely tuning range from0.67μm (visible) to2.5μm (Mid-IR) in this experiment. We also developed a temperature dependent Sellmeier equation of LiTaO3, for the wavelength range0.53μm-2.5μm and for temperature180℃-400℃. The main contents are as follows:1. A diode end-pumped Nd:YVO4solid state laser with a flat-flat resonator was constructed in this work and the focal length of the equivalent thermal lens was measured using unstable cavity method. The focal length of thermal lens versus input pump power is plotted. Based on this, we constructed a diode-pumped Nd:YVO4all solid state laser with mechanical chopper Q-switch. The average output power (1064nm) can reach1.08W with26ns pulse width at12.35KHz repetition frequency when the pump power (808nm) was8W.2. For the first time, we demonstrated broadly tunable OPG using PPCLT at high temperature up to400℃. We used five channels and realized widely tuning range from0.67μm (visible) to2.5μm (Mid-IR) in this experiment. For potential research interests at high temperature level, we also developed a temperature dependent Sellmeier equation of LiTaO3, for the wavelength range0.53μm-2.5μm and for temperature180℃-400℃.