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Passive frequency stabilization in Nd:YAG pulse laser using reflective volume Bragg grating.

Liming Qian¹, Weijiang Zhao, Deming Ren

¹National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin, China. moneydawn@126.com

|November 16, 2011

Summary

Researchers developed a stable Q-switched single-longitudinal-mode (SLM) Nd:YAG laser. A volume Bragg grating output coupler successfully stabilized laser output and prevented mode hopping.

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Area of Science:

Optics and Photonics
Laser Physics
Materials Science

Background:

Q-switched lasers are crucial for high-power pulsed applications.
Achieving stable single-longitudinal-mode (SLM) operation in lasers can be challenging due to mode hopping.
Nd:YAG lasers are widely used solid-state gain media.

Purpose of the Study:

To demonstrate a stable Q-switched single-longitudinal-mode (SLM) Nd:YAG laser.
To investigate the effectiveness of a volume Bragg grating as an output coupler for laser stabilization.
To achieve high output energy from the SLM laser.

Main Methods:

Utilized a volume Bragg grating as the output coupler in a Q-switched Nd:YAG laser setup.
The volume Bragg grating acted as both a longitudinal mode selector and a passive frequency stabilizer.

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Characterized the laser output for stability and mode hopping suppression.

Main Results:

Successfully achieved stable Q-switched single-longitudinal-mode (SLM) operation.
The volume Bragg grating effectively eliminated the mode hopping effect.
Obtained a maximum output energy of 18.5 mJ from the SLM Nd:YAG laser.
Observed frequency separation significantly less than longitudinal mode separation, confirming SLM stability.

Conclusions:

A stable Q-switched SLM Nd:YAG laser was successfully demonstrated.
Volume Bragg gratings are effective components for achieving stable, single-mode laser operation.
The developed laser system offers potential for applications requiring stable, high-energy pulses.