A kind of film of depolarization beam combiner and design method thereof
A design method and depolarization technology, which is applied in the field of lasers, can solve the problem of inability to obtain high reflectivity, transmittance depolarization effect, large polarization separation of P-polarized light and S-polarized light, and inability to take both anti-reflection and high reflection into consideration. and other problems, to achieve good depolarization effect and spectral characteristics, eliminate polarization separation, and excellent spectral characteristics
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[0065] This embodiment provides a 45-degree near-infrared depolarization beam combiner film and a design method. Its combined laser beam wavelength: λ A 976nm, λ B It is 1010nm, that is, it needs to meet the high reflection of P-polarized light and S-polarized light at 976nm, and the high transmission of P-polarized light and S-polarized light at 1010nm, and eliminate the polarization separation of P-polarized light and S-polarized light. image 3 Shown is the regular high-reflection film: Sub|(HL)^20|Air transmittance spectrum, it can be seen that the initial film system has a large degree of polarization separation, even through optimization, it is difficult to completely eliminate polarization. Therefore, more effective depolarization design methods are needed.
[0066] The specific design method includes the following steps:
[0067] 45-degree near-infrared depolarization beam combiner film structure, such as figure 1 As shown, it includes a substrate 1 and a first thi...
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