High-power single-frequency Nd:YVO4 green laser by self-compensation of astigmatisms
نویسندگان
چکیده
For a Nd:YVO4 crystal, a strong thermal lens astigmatism is observed by using a probe beam technique. By orienting the c-axis of the Nd:YVO4 crystal in the tangential plane of the ring resonator, we find the two astigmatisms introduced by the ring cavity and thermal lens can be mutually compensated. Such compensation improves the stability, beam quality, and conversion efficiency of the laser. As a result, a singlefrequency green laser of 25.3 W (M < 1.10) was obtained with an optical-optical conversion efficiency of 32.2%, and the power stability is better than±0.4% over 8 hours. To the best of our knowledge, this is the highest output power and conversion efficiency of intracavity frequency-doubling single frequency green Nd:YVO4 laser. O u tp u t p o w e r, W 30
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