Fabrication and improvement of diffraction grating with femtosecond and $CO_2$ laser

레이저를 이용한 회절격자 제작 및 효율 향상 연구

We fabricated the diffraction grating on the surface of fused silica glass using a femtosecond laser. The grooves of diffraction grating has a lot of micro crack and debris result in reduced diffraction efficiency. So, we polished the diffraction grating with $CO_2$ laser beam. With different scan number of $CO_2$ laser beam, we observed the image of diffraction grating and measured the diffraction efficiency.