干涉儀依靠長同調長度之雷射為光源，由參考平面與待測平面之波前干涉產生干涉條紋，而干涉條紋之穩定性決定於雷射光源之頻寬與頻率穩定性，故需要設計高功率、短波長、隨時間高穩定度之雷射。 本實驗利用體積布拉格全像光柵架設短共振腔、腔內二倍頻、達到主動式穩頻。穩定度達20 MHz、綠光輸出11.3 mW、綠光同調長度28 m。 並探討又於體積布拉格全像光柵設計短共振腔耦合輸出鏡造成縱模模態。利用Virtual surface模擬不等距縱模模態與探討其對於雷射動力學行為，與實驗驗證，發現溫度、有效共振腔長、激發光源會對於短體積布拉格共振腔有許多異常於平常之變化。 Diode-pumped solid state lasers are efficient coherent radiation source that important have applications in spectroscopy; such as in a interferometer system Interferometers usually require frequency stabilized laser since the stability of interference fringes is affected by frequency stability of the laser output source. In order to achieve frequency stabilization, We used volume Bragg gratings as cavity coupling mirrors which reduces cavity complexity, and allows the laser system to achieve single longitudinal mode. A frequency stabilized 532 nm laser was constructed using Nd:GdVO4 as the gain medium, KTP(KTiOPO4) as the second-harmonic generation crystal, and VBG as the mode selector. Using the error signal feedback the laser cavity achieves active frequency stabilization. The active frequency stabilization specs contain 532 nm coherent length about 28 m, output power about 11 mW, and stability about 20MHz. Using the Virtual surface simulation find to not satisfied tradition longitudinal mode space. And experimental verification find that temperature, the effective cavity length to affect the laser phenomenon If the laser will be used volume Bragg gratings coupler mirror, it can create many abnormal changes in tradition laser phenomenon.
