Device and method for detecting weak absorption of optical element
An optical element, weak absorption technology, applied in the direction of testing optical performance, etc., can solve the problems of low measurement results, low sensitivity of thermal lens, increase the complexity of system structure, etc., to achieve the effect of improving sensitivity and accuracy
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[0031] Such as figure 1As shown, the device for detecting weak absorption of optical elements described in the present invention includes a pump laser 10, a nonlinear crystal 30, a dichroic mirror 11, a reflection structure, a first focusing mirror 12, a second focusing mirror 13, The filter element 22, the pinhole 21 and the photodetector 20, the pump laser 10 in the embodiment of the present invention is a Q-switched solid-state laser whose working substance is Nd:YAG. The nonlinear crystal 30 is arranged at the laser emitting end of the pump laser 10 for converting part of the pump laser light into frequency-doubled laser light. The dichroic mirror 11 and the nonlinear crystal 30 have an included angle, which is used to separate the frequency-doubled laser from the pump laser. In the embodiment of the present invention, the dichroic mirror 11 and the nonlinear crystal 30 The included angle is 45°. The first focusing mirror 12 is arranged between the dichroic mirror 11 and...
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