Investigation On All-solid-state 1.1 μm And 1.5 μm Raman Lasers

With the development of lasers and crystal growth technique, as an efficient method to extend the laser spectral coverage, all-solid-state Raman lasers which are based on Stimulated Raman Scattering（SRS） have become an advanced research focus. By choosing appropriate Raman active crystals, the combination of Raman conversion and other frequency conversion based on secondorder nonlinearity process, such as second harmonic generation or sum-frequency generation, has been employed to generate wavelengths covering the ultraviolet（UV） to the infrared（IR）.Based on the research background of all solid-state Raman lasers, the principle of Stimulated Raman Scattering, and the introduction of Q-switching, mode-locking technique and resonator design, two research subjects of 1.5 μm and 1.1 μm Raman lasers were raised. Investigations in this thesis are as follows:（1） LD side-pumped acoustic-optics Q-switched Nd:YAP/YVO₄ and Nd:YAG/YVO₄ Raman lasers were realized with the wavelength of 1525 nm by using a coupled cavity. The performance of the both two laser systems were investigated, such as the average output power, the pulse width, the pulse energy and etc.（2） A fiber-coupled laser diode end-pumped passively Q-switched and mode-locked Raman laser at 1176 nm was realized by using Nd:YAG/Cr⁴⁺:YAG/YAG composite crystal and the YVO₄ Raman active medium. The maximum average output power was 709 mW with a corresponding conversion efficiency of 6.81%.