Polarization-independent quasi-phase-matching frequency multiplier and manufacturing method thereof
A manufacturing method and matching technology, which can be used in instruments, lasers, phonon exciters, etc., can solve problems such as polarization state dependence of fundamental frequency light, and achieve the effect of improving stability and overcoming dependence.
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[0035] According to the design, a depolarizer and two identical PPLN crystals are used, and their c axes are along the z direction and the y direction respectively. A fiber laser is selected as the light source for pumping the fundamental frequency light, and the output laser with a changed polarization state is incident along the x direction. After passing through the depolarizer, the polarization degree of the fundamental frequency light can be reduced to 1% (the polarization degree of natural light is 0). At this time, the intensity of the z-direction polarization component of the fundamental frequency light is approximately equal to the intensity of the y-direction polarization component. Then the z-polarized light undergoes EEE-type frequency doubling in the first PPLN, and the y-polarized light also undergoes EEE-type frequency doubling in the second PPLN. The effective lengths of the two nonlinear processes are equal, so The linear coefficients are equal and are the lar...
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