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A technology of birefringent crystal and laser beam combiner, which is applied in the intersection field of polarized optics and strong laser, can solve the problem that multiple polarized laser beams cannot be combined continuously, and achieve the effect of reducing reflection loss and increasing transmittance
Active Publication Date: 2020-07-03
QUFU NORMAL UNIV
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[0006] Aiming at the disadvantage that the reverse application of the existing birefringent crystalpolarization beam splitter cannot be used for continuous beam combining of multiple polarized lasers, the present invention provides a uniaxial birefringent crystal polarization laser beam combiner, which utilizes a single Axial birefringent crystals are designed and manufactured. For normal incident light, each part of the transmitted and totally reflected beams participating in the beam combiner can have the same optical path in the beam combiner, which meets the requirements for continuous beam combining of polarized lasers. conditions, so it can be used for continuous beam combining of multiple polarized lasers; the available wavelength band depends on the non-absorbing spectral range of the uniaxial birefringent crystal used, so high-power beam combining lasers can be obtained
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Embodiment 1
[0029] Such as Figure 1-2 As shown, a uniaxial birefringent crystal polarization laser beam combiner, which is made of uniaxial birefringent crystal, the left part is a right-angled triangular prism, the right part is a pentaprism, and the crystal optical axes of the left and right parts are in the same direction ; Use 10~15μm polyethylene film between the two parts to make a cushion layer with the same shape as the glued surface of the left and right parts, and an oval-shaped hollow inside, and then fix the left and right parts into a whole with glue around them. For a negative uniaxial crystal, the optical axis is parallel to the z axis, that is, in the ABCDF plane and parallel to AF and BC; for a positive uniaxial crystal, the optical axis is parallel to the x axis, that is, perpendicular to the ABCDF plane; giving such a crystal optical axis orientation , on the one hand, the polarized laser light that is transmitted and participates in beam combining can take the minimum...
Embodiment 2
[0060] The similarities between this embodiment and Embodiment 1 will not be repeated, and the difference lies in that the wavelength λ=808nm and the beam diameter Φ=8mm of the combined polarized laser light.
[0061] The specific design is as follows:
[0062] 1) According to the dispersion formula of icelandite crystal ordinary light, the n of icelandite crystal 808n is obtained o =1.66288,
[0063] θ c =36.968°;
[0064] 2) Take α=0.5°, get: β=37.468°;
[0065] 3) Get: AF=BC=CD=10.67mm, figure 2 The thickness perpendicular to the paper surface is equal to 10.67mm;
[0066] 4) Obtained from formulas (2), (4) and (5): GB=DF=2.87mm, ∠FGB=∠DFG=127.468°,
[0067] ∠BCD=105.064°;
[0068] Together with ∠FAG=∠GBC=∠CDF=90°, the parameters for making a multi-beam 808nm polarized laser beam combiner using negative uniaxial crystal Icelandic stone are all given.
Embodiment 3
[0070] The similarities between this embodiment and Embodiment 1 will not be repeated, and the difference lies in: the wavelength λ=1064nm of the combined polarized laser light, and the beam diameter Φ=8mm.
[0071] The specific design is as follows:
[0072] 1) According to the dispersion formula of icelandite crystal ordinary light, the n of Icelandicite crystal at 1064nm is obtained o =1.64267, θ c =37.500°;
[0073] 2) Take α=0.5° to get: β=38.000°;
[0074] 3) Get: AF=BC=CD=10.67mm, figure 2 The thickness perpendicular to the paper surface is equal to 10.67mm;
[0075] 4) Obtained from formulas (2), (4) and (5): GB=DF=2.66mm, ∠FGB=∠DFG=128.000°,
[0076] ∠BCD=104.00°;
[0077] Together with ∠FAG=∠GBC=∠CDF=90°, use negative uniaxial crystal icelandite to make multi-beams
[0078] The parameters of the 1064nm polarized laser beam combiner are given in full.
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Abstract
The invention relates to a single-axis birefringent-crystal polarization laser beam combiner made of single-axis birefringent crystals. The single-axis birefringent-crystal polarization laser beam combiner is characterized in that the combiner comprises a right-angle prism on the left and a pentaprism on the right, and the crystaloptical axis directions of the two parts are consistent; a pad layer made of polyethylene film of 10-15 micrometers is arranged between the two parts, the shape of the pad layer is identical with the adhering faces of the left part and the right part, the interior ofthe pad layer is of a hollow elliptical shape, and the periphery of the pad layer is provided with an adhesive to fixedly integrate the left part and the right part; the single-axis birefringent-crystal polarization laser beam combiner can use negative single-axis crystals and positive single-axis crystals, but the directions of the crystal axis are vertical to each other; the two incident end faces of the single-axis birefringent-crystal polarization laser beam combiner and the outgoing end face of the combined light beam are squares identical in side length; the structural angle beta of thesingle-axis birefringent-crystal polarization laser beam combiner is thetac+alpha, the alpha guarantees the allowance angle of S vibration polarization light beam total reflection, the alpha is 0.5 degree for the single-axis crystals with the birefringence larger than 0.1, and the alpha is 0.3 degree for the single-axis crystals with the birefringence smaller than 0.1.
Description
technical field [0001] The invention belongs to the cross technical field of polarization optics and strong laser, and relates to a uniaxial birefringence crystal polarization laser beam combiner and a design method. Background technique [0002] In recent years, high-power laser synthesis technology has become a research hotspot in the field of laser technology development. The simplest beam synthesis technology is incoherent synthesis based on spatial beam splicing. This technology only realizes the simple superposition of power on the target object, and cannot improve the brightness of the combined light. There is room for development in the interaction with long-distance targets. restricted. In order to improve the brightness, people have developed laser coherent combining technology, which is divided into split-aperture combining and common-aperture combining. The disadvantage of sub-aperture laser synthesis is that there are side lobes in the far-field output spot, w...
Claims
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