Research of intensity noise suppression in laser diode pumped Nd:YAG lasers

LIANG Yinglei; YANG Suhui; ZHAO Changming; ZHANG Haiyang

doi:10.7510/jgjs.issn.1001-3806.2016.01.025

In order to reduce the relaxation oscillation noise of a diode pumped solid-state laser and improve its stability of output power, the intensity noise was suppressed by means of optoelectronic negative feedback. Theoretical characteristics of laser intensity noise were analyzed. According to the results of theoretical analysis, a proportion-integration-differention(PID) feedback control circuit was designed. By carrying out feedback circuit to suppress the laser intensity noise, ideal experimental data were obtained. When pumped power is 700mW, peak frequency of relaxation oscillation is 300kHz, intensity noise at relaxation oscillation peak and low frequency decreases to 45dB and 15dB respectively. When pumped power is 550mW, relaxation oscillation peak frequency is 250kHz, intensity noise at relaxation oscillation peak and low frequency decreases to 40dB and 10dB respectively. The results shows that the feedback control circuit can effectively reduce intensity noise of a diode pumped solid state laser and improve the stability of laser output power.

Research of intensity noise suppression in laser diode pumped Nd:YAG lasers

Corresponding author: YANG Suhui, suhuiyang@bit.edu.cn;

1. School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China

Received Date: 2014-12-10

Accepted Date: 2015-01-23

Available Online: 2016-01-25

Abstract: In order to reduce the relaxation oscillation noise of a diode pumped solid-state laser and improve its stability of output power, the intensity noise was suppressed by means of optoelectronic negative feedback. Theoretical characteristics of laser intensity noise were analyzed. According to the results of theoretical analysis, a proportion-integration-differention(PID) feedback control circuit was designed. By carrying out feedback circuit to suppress the laser intensity noise, ideal experimental data were obtained. When pumped power is 700mW, peak frequency of relaxation oscillation is 300kHz, intensity noise at relaxation oscillation peak and low frequency decreases to 45dB and 15dB respectively. When pumped power is 550mW, relaxation oscillation peak frequency is 250kHz, intensity noise at relaxation oscillation peak and low frequency decreases to 40dB and 10dB respectively. The results shows that the feedback control circuit can effectively reduce intensity noise of a diode pumped solid state laser and improve the stability of laser output power.

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Reference (15)

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Research of intensity noise suppression in laser diode pumped Nd:YAG lasers

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