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Chin. Phys. B, 2019, Vol. 28(9): 094204    DOI: 10.1088/1674-1056/ab327b

Stable continuous-wave single-frequency intracavity frequency-doubled laser with intensity noise suppressed in audio frequency region

Ying-Hao Gao(高英豪)1, Yuan-Ji Li(李渊骥)1,2, Jin-Xia Feng(冯晋霞)1,2, Kuan-Shou Zhang(张宽收)1,2
1 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China;
2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China

We demonstrated a continuous wave (cw) single-frequency intracavity frequency-doubled Nd:YVO4/LBO laser with 532 nm output of 7.5 W and 1.06 μm output of 3.1 W, and low intensity noise in audio frequency region. To suppress the intensity noise of the high power 532 nm laser, a laser frequency locking system and a feedback loop based on a Mach-Zehnder interferometer were designed and used. The influences of the frequency stabilization and the crucial parameters of the MZI, such as the power splitting ratio of the beam splitters and the locking state of the MZI, on the intensity noise of the 532 nm laser were investigated in detail. After the experimental optimizations, the laser intensity noise in the frequency region from 0.4 kHz to 10 kHz was significantly suppressed.

Keywords:  continuous wave single-frequency intracavity frequency-doubled laser      noise suppression      power stabilization      audio frequency  
Received:  15 March 2019      Revised:  26 June 2019      Accepted manuscript online: 
PACS:  42.55.Xi (Diode-pumped lasers)  
  42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)  
  42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps)  

Project supported by the National Key R&D Program of China (Grant No. 2016YFA0301401).

Corresponding Authors:  Yuan-Ji Li     E-mail:

Cite this article: 

Ying-Hao Gao(高英豪), Yuan-Ji Li(李渊骥), Jin-Xia Feng(冯晋霞), Kuan-Shou Zhang(张宽收) Stable continuous-wave single-frequency intracavity frequency-doubled laser with intensity noise suppressed in audio frequency region 2019 Chin. Phys. B 28 094204

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