Experimental results are reported on the compensation of thermal lensing caused by the radial thermal gradient in an optically pumped Nd:YAG laser. Poly(methyl methacrylate) (PMMA) with a higher negative d n / d T , a high damage threshold and low absorbance is very useful for compensating thermal effects in the amplifier. The results revealed that the use of PMMA resulted in the complete reduction of the thermal lens effect by an order of magnitude.
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Yoshida et al. (2007) studied this question.
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