Abstract
A novel method is applied to measure the focal length of thermal lens of a CW Nd:YAG laser. Using resonator critical stable point G1∗G2=0, by measuring output power as pumping power increasing, the laser rod thermal lens focal length fr of all rays polarized in radial direction and the thermal lens focal length fθ of all rays polarized in tangential direction can be calculated. The method can also be used to obtain the average effective thermal lens focal length f. The method requires no special equipment and is simple to implement. The measuring deviation of the method comparing with probe beam method is within the accuracy that is in the range of ±10%. It is less than the unstable-resonator method that is in the range of ±20%.
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