公开(公告)号：US20170317464A1

公开(公告)日：2017-11-02

申请号：US15651253

申请日：2017-07-17

Applicant: GIGAPHOTON INC.

Inventor： Yoshiaki KUROSAWA ,  Hideo HOSHINO

IPC: H01S3/10 ,  H01S3/034 ,  H01S3/00 ,  H01S3/08 ,  H01S3/095 ,  H01S3/23

CPC classification number: H01S3/10007 ,  H01S3/0064 ,  H01S3/0071 ,  H01S3/034 ,  H01S3/08072 ,  H01S3/095 ,  H01S3/09702 ,  H01S3/1003 ,  H01S3/10069 ,  H01S3/2308 ,  H01S3/2316 ,  H01S2301/02 ,  H05G2/008

Abstract: A laser apparatus may include a master oscillator, a plurality of amplifiers, a photodetector device configured to detect a light beam traveling back along a laser beam path, and a controller. The photodetector device may include a first photodetector configured to detect energy of a light beam traveling back along the laser beam path and a second photodetector configured to detect power of the light beam traveling back along the laser beam path. The controller may be configured to determine that a return beam is generated when the intensity of the energy detection signal exceeds a first threshold. The controller may be configured to determine that a self-oscillation beam is generated when the intensity of the power detection signal exceeds a second threshold.