Tunable V-shaped Cavity Single Longitudinal Mode Ti:sapphire Solid-State Laser System Using Volume Bragg Grating as Laser Mirror

• Main Authors: Cheng-yeh Chiang, 江承燁
• Other Authors: Te-yuan Chung
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/4rg55e

碩士 === 國立中央大學 === 光電科學研究所 === 97 === Lasers with narrow linewidth and wavelength tunability are important for spectroscopy applications. To reach such performance, several methods with different optical elements have to be introduced to the cavity designs. However, the insertion of these optical elements gives extra loss to the cavity and results in alignment complexity. A new optical element, Volume Bragg Grating (VBG), can work as a wavelength tuning and mode selection element at the same time inside the cavity to achieve desired laser performance. This thesis demonstrated three types of laser cavity designs. Linear cavity setup used dielectric mirror and VBG as the output coupler. V-shaped cavity setup used VBG as laser folding mirror and dielectric mirror as the output coupler. Ti:sapphire crystal was chosen to be the gain medium since it has an extensively large laser tuning range from 700 nm to 1100 nm. The V-shaped cavity setup achieved tuning range from 783.5 nm to 741.6 nm by using one single VBG which has its central reflection wavelength at 790.3 nm. Laser output performance including Fabry-Perot interference spectral measurement, laser threshold, slope efficiency, and M2 measurement were analysed in detail.