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[0007] For the reverse application of existing birefringent crystal polarizing beam splitters, which cannot be used for continuous beam combining of multiple polarized lasers, and the currently commonly used uniaxial birefringent crystal has a limited transmission spectrum, the present invention provides a The biaxial birefringent crystal α-BTM infrared polarization laser beam combiner is designed and manufactured by using the orthogonal phase biaxial birefringent crystal α-BTM. For the normal incident light, the transmission and total reflection can be respectively involved. Each part of the combined beams has the same optical path in the beam combiner, which meets the conditions for continuous beam combining of polarized lasers, so it can be used for continuous beam combining of 1.0~5.0µm infrared polarized lasers, so that high beam combining laser
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Embodiment 1
[0031] Such as Figure 1-2 As shown, a biaxial birefringent crystal α-BTM infrared polarized laser beam combiner is used to
[0032] It is made of biaxial birefringent crystal α-BTM. The left side is a rectangular prism and the right side is a pentagonal prism. The shape made of 10~15µm polyethylene film between the two parts is the same as the glued surface of the beam combiner. It is an oval-shaped hollow cushion, and the two parts are fixed as a whole with glue around it. The crystal orientation of the two parts is the same, and the x of the crystal 1 The axis is in the DEFGH plane and parallel to the HD and EF sides, x 3 The axis is perpendicular to the DEFGH plane, and the combined beam is along x 2 shaft output. Given such a crystal orientation, on the one hand, the polarized laser light that transmits and participates in the beam combination can take the minimum refractive index in the crystal, and it is P-vibrated relative to the glued interface, which can reduce t...
Embodiment 2
[0058] The similarities between this embodiment and Embodiment 1 will not be described again, and the difference lies in: the wavelength λ=1310nm of the combined polarized laser light. The specific design parameters are determined as follows:
[0059] 1) By the main refractive index n of α-BTM crystal 3 The dispersion formula, get n 3 =2.18126, β c =27.29°;
[0060] 2) Take α=0.5° to get θ=27.79°;
[0061] 3) It can be obtained from the above, HD=EF=FG=10.67mm, figure 2 The thickness perpendicular to the paper surface is equal to 10.67mm;
[0062] 4) From formulas (2), (4) and (5), IE=GH=7.31mm, ∠HIE=∠GHI=117.79°, ∠EFG=124.42°;
[0063] Together with ∠HDI=∠IEF=∠FGH=90°, the parameters of the biaxial birefringent crystal α-BTM infrared polarization laser beam combiner with a beam diameter of Φ=8mm and 1310nm are all given.
Embodiment 3
[0065] The similarities between this embodiment and Embodiment 1 will not be repeated, and the difference lies in: the wavelength λ=1550nm of the combined polarized laser light. The specific design parameters are determined as follows:
[0066] 1) By the main refractive index n of α-BTM crystal 3 The dispersion formula, get n 3 =2.17389, β c =27.39°;
[0067] 2) Take α=0.5° to get θ=27.89°;
[0068] 3) It can be obtained from the above, HD=EF=FG=10.67mm, figure 2 The thickness perpendicular to the paper surface is equal to 10.67mm;
[0069] 4) From formulas (2), (4) and (5), IE=GH=7.26mm, ∠HIE=∠GHI=117.89°, ∠EFG=124.22°;
[0070] Together with ∠HDI=∠IEF=∠FGH=90°, the parameters of the biaxial birefringent crystal α-BTM infrared polarization laser beam combiner with a beam diameter of Φ=8mm and 1550nm are all given.
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Abstract
A near- and mid-infrared polarized laser beam combiner based on a biaxial birefringent crystal α-BTM material belongs to the cross technical field of polarization optics and strong laser, and is characterized in that it uses an orthorhombic phase bariumtelluriummolybdate (BaTeMo 2 o 9 ) crystal, the left side is a right angle triangular prism, the right side is a pentaprism, the crystal orientation of the two parts is consistent; the shape made of 10~15μm polyethylene film between the two parts is the same as the glued surface of the beam combiner, and the inner It is an oval-shaped hollow cushion, and the two parts are fixed as a whole with glue around it. The two incident end faces and the outgoing end faces of the beam combiner are square, and the side lengths are equal. Through the special design of the structure angle of the beam combiner, two-way coherent laser combination or non-coherent power combination with high efficiency and high beam quality can be realized.
Description
technical field [0001] The invention belongs to the cross technical field of polarization optics and strong laser, and relates to a biaxial birefringent crystalbariumtelluriummolybdateinfrared 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 brightness, people have developed laser coherent combining technology, which can be divided into sub-aperture combining and common-aperture combining. The disadvantage of sub-aperture laser synthesis is that there are side lobes...
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