Radially polarized beam in a microchip Nd:YVO4 laser

• Main Authors: Yi-ShenLai, 賴易伸
• Other Authors: Ming-Dar Wei
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/11065758737299191157

碩士 === 國立成功大學 === 光電科學與工程學系 === 101 === A radially polarized microchip Nd:YVO4 laser was generated by shaping the pump profile. The bottle-beam pump profile was formed by a plane wave propagating through an axicon and a lens to be a group of focused plane waves which the directions of which were located on a conical surface. When the thermal effect and birefringence of the laser crystal were considered, the oblique incident pump profile distinguished the extraordinary ray from the ordinary ray to achieve the radially polarized output beam. The average contrast ratio was 23.6 when the pump power was between 3.06 and 4.27 W.