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Proceedings Paper

Frequency locking of diode-pumped Nd:YAG lasers with the digital PID method at 532-nm iodine lines in incoherent wind lidar
Author(s): Songhua Wu; Dapeng Sun; Zhishen Liu
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Paper Abstract

In our new compact DDWL (direct-detect wind lidar), we use a CrystaLaser model IRCL-100-1064S laser as a seeder, which has a thermal frequency actuator inside. Given that the external frequency actuator can only achieve green radiation stability and are technically complicated and difficult of application, here we describe a simpler method-applying improved digital PID algorithm to a servo in the compact commercial CrystaLaser laser. A PID algorithm simplifies regulation of even the most difficult cryogenic systems. The PID controller can anticipate the load action to provide closer temperature stability for the laser frequency stabilization. After setting the desired locking point to the process, the controller calculates the output with improved digital PID algorithm, and the output is fed back into the thermal actuator of the laser, which keep the laser locked to the iodine line at a central laser frequency stability level of better than 1 MHz for arbitrarily long periods.

Paper Details

Date Published: 21 March 2003
PDF: 6 pages
Proc. SPIE 4893, Lidar Remote Sensing for Industry and Environment Monitoring III, (21 March 2003); doi: 10.1117/12.466460
Show Author Affiliations
Songhua Wu, Ocean Univ. of Qingdao (China)
Dapeng Sun, Ocean Univ. of Qingdao (China)
Zhishen Liu, Ocean Univ. of Qingdao (China)

Published in SPIE Proceedings Vol. 4893:
Lidar Remote Sensing for Industry and Environment Monitoring III
Upendra N. Singh; Toshikasu Itabe; Zhishen Liu, Editor(s)

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