OPTICAL GAIN CALCULATION BY USING FDTD METHOD ON CONTINUE WAVE CASE

• Main Author: Shafira Bachtiar, Nabilla
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/55467
• Institution: Institut Teknologi Bandung

Laser is one of the most important components in technology development, from telecommunication technology that started to use photon as information medium to medical technology which use laser for therapy, many things use laser nowadays. Therefore, many studies how to optimize laser so it could get best effectiveness and efficiency. Many ways to optimize laser. One of them is set the laser medium. This age, the most laser medium is one which comes from rare earth elements. One of those rare earth elements is trivalent neodymium (Nd3+). Its energy level structure and spectroscopic properties make this kind of laser can radiate light well so it can luminensce infrared wave. The change of laser’s medium affects its optical gain. Optical gain needs to be observed because naturally light wil always undergo loss Hence, high optical gain is needed to counter this loss. For calculating optical gain, an accurate calculation is needed so loss could be minimalized as best as possible. One of the ways to calculate is by simulate the optical gain. In this writing, Finite Difference Time Domain (FDTD) method is used to simulate the optical gain. This method is used because there is no matrices involved so the calculation will be more simple and use less memory. In this simulation, nice optical gain calculation result is obtained by using MATLAB program and somewhat accurate spectrum calculation result is obatined by using Lumerical FDTD software.