AU - Mobashery, Abolhasan AU - Panahi, Ehsan AU - Manoochehri, Sohrab TI - Modal Discrimination in a Laser Resonator by means of Internal Phase Grating to Produce 20th Order Super-Gaussian Mode as Fundamental Mode PT - JOURNAL ARTICLE TA - opsi JN - opsi VO - 23 VI - 0 IP - 0 4099 - http://opsi.ir/article-1-1245-en.html 4100 - http://opsi.ir/article-1-1245-en.pdf SO - opsi 0 ABĀ  - Abstract- Producing desirable modes in a laser resonator as a fundamental one and eliminating other modes is common in designing laser resonators to extract more power from gain medium. High modal discrimination achieved by designing a resonator consists of a mode-selecting mirror and an internal phase grating. In this research, we simulate a resonator with a mode-selecting mirror and an internal phase grating by Mathlab software. By this method, higher order modes are eliminated and 20th order Super-Gaussian mode is produced by mode selectingg mirror and remain with minimum loss. By comparing 20th Super-Gaussian and TEM11 modes, optimal frequency for phase grating is obtained by simulating these two modes propagation in resonator. CP - IRAN IN - LG - eng PB - opsi PG - 493 PT - Research YR - 2017