External cavity laser

Abstract

Provided is an external cavity laser for use in the field of communications. The external cavity laser comprises: a gain chip (12), a lens (11), a polarizing beam splitter (15), a quarter-wave plate (16), a reflector (17) and a grating (18). The gain chip (12) produces multi-longitudinal mode light and outputs the same to the lens (11); the lens (11) collimates the light inputted from the gain chip (12), and outputs the collimated light to the polarizing beam splitter (15); the polarizing beam splitter (15), the quarter-wave plate (16) and the grating (18) are positioned successively in the propagation direction of the collimated light outputted by the lens (11); the polarizing beam splitter (15) transmits the received P-polarized light and reflects the received S-polarized light; and the reflector (17) receives the S-polarized light emitted from the quarter-wave plate (16) after the same has been reflected by the polarizing beam splitter (15), and reflects perpendicularly at least a part of the light received thereby back to the polarizing beam splitter (15). The external cavity laser provided by the present invention has a relatively high rate of dispersion, and the laser light (13) outputted thereby has a relatively high side-mode suppression ratio. 提供一种用于通信领域的外腔激光器。所述外腔激光器包括：增益芯片(12)、透镜(11)、偏振分束器(15)、四分之一波片(16)、反射镜(17)和光栅(18)。增益芯片(12)产生多纵模光并将其输出到所述透镜(11)；所述透镜(11)对由增益芯片(12)输入的光进行准直，并将准直后的光输出到偏振分束器(15)；所述偏振分束器(15)、所述四分之一波片(16)和所述光栅(18)依次位于所述透镜(11)输出的所述准直后的光的传播方向上；所述偏振分束器(15)将其接收到的P偏振的光进行透射，将其接收到的S偏振的光进行反射；所述反射镜(17)接收由所述四分之一波片(16)出射的S偏振的光经所述偏振分束器(15)反射后的光，并将其接收到的光的至少一部分垂直反射回所述偏振分束器(15)。本发明提供的外腔激光器，具有较高的色散率，输出的激光(13)具有较高的边模抑制比。