Design of precision control systems for tunable semiconductor lasers

CAO Yanchang; XIONG Jijun; HOU Qingzhi

doi:10.7510/jgjs.issn.1001-3806.2015.03.007

In order to meet the requirements of high stability of semiconductor laser in high precision measurement field, a semiconductor laser control system with high stability and low noise was proposed. The control system consists of a current driver and temperature controller. A negative feedback was used to maintain the current stability. A highly integrated MAX1978, as main control chip, was used to drive the thermoelectric cooler for temperature compensation. After the experiment verification, current was adjustable in the range of 200mA, current control accuracy was less than 1A. The effective value of alternating current noise voltage within 3kHz~100kHz bandwidth was less than 300nA and long-term temperature drift was less than 2m℃. The results show that the system can be used to drive distribibuted feedback external cavity LD lasers and distributed Bragg reflector LD lasers.

Design of precision control systems for tunable semiconductor lasers

Corresponding author: XIONG Jijun, cych.nuc@gmail.com;

1. National Key Laboratory for Electronic Measurement Technology, North University of China, Taiyuan 030051, China

Received Date: 2014-05-20

Accepted Date: 2014-08-14

Available Online: 2015-05-25

Abstract: In order to meet the requirements of high stability of semiconductor laser in high precision measurement field, a semiconductor laser control system with high stability and low noise was proposed. The control system consists of a current driver and temperature controller. A negative feedback was used to maintain the current stability. A highly integrated MAX1978, as main control chip, was used to drive the thermoelectric cooler for temperature compensation. After the experiment verification, current was adjustable in the range of 200mA, current control accuracy was less than 1A. The effective value of alternating current noise voltage within 3kHz~100kHz bandwidth was less than 300nA and long-term temperature drift was less than 2m℃. The results show that the system can be used to drive distribibuted feedback external cavity LD lasers and distributed Bragg reflector LD lasers.

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Reference (10)

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Design of precision control systems for tunable semiconductor lasers

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References

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