公开(公告)号：US10530116B2

公开(公告)日：2020-01-07

申请号：US16173350

申请日：2018-10-29

Applicant: MITUTOYO CORPORATION

Inventor： Yusuke Shirakawa

IPC: H01S3/13 ,  H01S3/086 ,  H01S3/10

Abstract: A laser device includes an excitation light source, a resonator which receives excitation light from the excitation light source and generates laser light, an absorption cell to which the laser light is emitted, a light converter which converts the laser light passing through the absorption cell to a light output signal, a third order differential lock-in amplifier which generates a third order differential signal of the light output signal, and a controller. When a predetermined waveform of the third order differential signal is detected, the controller includes a return controller that determines a return direction of a resonator length based on the predetermined waveform and a resonator length controller that changes the resonator length to the return direction.

公开(公告)号：US09825423B2

公开(公告)日：2017-11-21

申请号：US15042627

申请日：2016-02-12

Applicant: MITUTOYO CORPORATION

Inventor： Ryunosuke Yano ,  Yusuke Shirakawa ,  Tatsuya Narumi

IPC: H01S3/13 ,  H01S3/139

CPC classification number: H01S3/1305 ,  H01S3/1392

Abstract: A laser-frequency stabilizer includes: a light detector that converts a laser beam passing through an iodine cell to an optical output signal, an actuator that changes a resonator length in accordance with a received output voltage, and a control unit that controls the output voltage applied to the actuator. The control unit searches for a target saturated absorption line based on the optical output signal and, when the output voltage when the target saturated absorption line is found is within a normal voltage range that is predetermined corresponding to the target saturated absorption line, locks a oscillation frequency of the laser beam to the target saturated absorption line.