Study on high power green lasers with unstable resonators

OU Tian-you; ZHANG Ning; PANG Qing-sheng; LI Gang

doi:10.3969/j.issn.1001-3806.2012.01.022

In order to improve its laser beam quality,obtain collimated laser beam and provide an excellent high-power green laser source to pump Ti:sapphire,a diode-side-pumped acoustic-optic Q-switched intra-cavity frequency doubling Nd:YAG laser was studied.In the experiment,a convex-plane unstable resonator was adopted assuming the convex mirrors and gain medium thermal lens as a telescope system.Experimental results show that a convex-plane unstable resonator has lager mode volume and better stability.Using a second type phase-matched KTP(KTiOPO4) for intra-cavity frequency doubling,with 200W pump power,42W green laser was output with 109ns pulse width,9.3kHz pulse repetition frequency,less than 2mrad divergent angle,21% optical-optical conversion efficiency and instability less than 2% during 24h work.It is proven that an effective output of green laser can be achieved with an unstable resonator and side pump module.

Study on high power green lasers with unstable resonators

1. 61711 Unit, Chinese People's Liberation Army, Kashi 844000, China;

2. Institute of Laser Engineering, Beijing University of Technology, Beijing 100022, China

Received Date: 2011-03-15

Accepted Date: 2011-05-17

Available Online: 2012-01-25

Abstract: In order to improve its laser beam quality,obtain collimated laser beam and provide an excellent high-power green laser source to pump Ti:sapphire,a diode-side-pumped acoustic-optic Q-switched intra-cavity frequency doubling Nd:YAG laser was studied.In the experiment,a convex-plane unstable resonator was adopted assuming the convex mirrors and gain medium thermal lens as a telescope system.Experimental results show that a convex-plane unstable resonator has lager mode volume and better stability.Using a second type phase-matched KTP(KTiOPO4) for intra-cavity frequency doubling,with 200W pump power,42W green laser was output with 109ns pulse width,9.3kHz pulse repetition frequency,less than 2mrad divergent angle,21% optical-optical conversion efficiency and instability less than 2% during 24h work.It is proven that an effective output of green laser can be achieved with an unstable resonator and side pump module.

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Reference (15)

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Study on high power green lasers with unstable resonators

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