| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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High-Repetition-Rate and High-Beam-Quality Laser Pulses with 1.5MW Peak Power Generation from a Two-Stage Nd:YVO$_{4}$ Amplifier |
| Qiu-Run He1, Jing Guo2, Bao-Fu Zhang1**, Zhong-Xing Jiao1,3** |
1School of Physics, Sun Yat-sen University, Guangzhou 510275
2Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082
3National Demonstration Center for Experimental Physics Education, Sun Yat-sen University, Guangzhou 510275
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| Cite this article: |
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Qiu-Run He, Jing Guo, Bao-Fu Zhang et al 2019 Chin. Phys. Lett. 36 114202 |
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Abstract We develop a two-stage end-pumped Nd:YVO$_{4}$ amplifier seeded by a passively Q-switched microchip laser. An average output power of 13.5 W with repetition rate up to 7 kHz and pulse duration of $\sim$1.24 ns is obtained, corresponding to a pump extraction efficiency of 16.1% (19.5% for the second stage) and peak power of $\sim $1.5 MW. The beam quality factors at maximum output power are measured to be $M_{x}^{2}=1.56$ and $M_{y}^{2}=1.48$. We introduce an analytical model to estimate gain and beam quality after amplification. This model focuses on the influence of ratio of seed spot radius to pump spot radius when designing an amplifier. Moreover, our experiments reveal that the re-imaging system in the double-pass configuration can be used to enhance the beam quality.
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Received: 13 August 2019
Published: 21 October 2019
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| PACS: |
42.55.-f
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(Lasers)
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42.55.Xi
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(Diode-pumped lasers)
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42.60.Lh
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(Efficiency, stability, gain, and other operational parameters)
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| Fund: Supported by the Natural Science Foundation of Guangdong Province under Grant Nos 2017A030310305 and 2018A030310092, and the Young Teachers Training Program of the Fundamental Research Funds for Sun Yat-sen University under Grant No 20174500031610017. |
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