| Summary: | 碩士 === 國立清華大學 === 光電工程研究所 === 95 === In general, cw solid state laser of single mode and tuning wavelength laser usually used etalon, prisms or grating. However, we used new optical element - Volume Bragg grating (VBG) to integrate short linear cavity to achieve single mode tuning cw solid state laser. VBG was make holography use of ultraviolet (UV) and record to Photo-thermal refractive (PTR) glass. It is the new optical element component coming out invented by Oleg M. Efimov et. The PTR VBG had many advantages such as large transparent range, high damage threshold, good thermal stability, and has controllable refraction index change. Therefore, a PTR VBG can work for an ideal narrow band laser mirror. Tuning the temperature or changing incident angle of the Bragg grating can shift the central lasing peak to tuning laser emission central wavelength. The 1070 nm lasing action of Nd:GdVO4 is demonstrated for the first time to our knowledge. The PTR VBG temperature range from 30 °C to 156 °C, and lasing wavelength can from 1070.26 nm to 1071.53 nm. Total tuning range is 1.27 nm. In addition, we have constructed a V-cavity Nd:GdVO4 laser using the VBG as the folding mirror and output coupler. And changing deflected angle from 14º to 21º and tunable wavelength from 1062 nm to 1066.3 nm, total tuning ranging is 4.3 nm.
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