Resonant cavity capable of obtaining hollow laser beams
A hollow laser beam and resonant cavity technology, applied in the field of resonant cavity, can solve the problems of reduced laser beam coherence, complex structure, large energy loss, etc.
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[0025] The resonator that can obtain the hollow laser beam of the present invention is made up of mirror 1, laser gain medium 2 and output coupling mirror 3, see figure 2 As shown, the material of the output coupling mirror 3 is a biaxial crystal, and one optical axis of the biaxial crystal is parallel to the axis of the resonant cavity. The pumping source 4 is an 808nm 30W laser diode array. The pump light 4 is coupled into the laser gain medium 2 in the resonant cavity by a coupling device. The coupling device is composed of a coupling fiber 5 and a coupling lens 6 . The coupling fiber 5 has a core diameter of 400 μm and a numerical aperture NA=0.22. The coupling lens 6 is composed of a pair of plano-convex lenses with opposite convex surfaces and a convex radius of 50mm. Both sides of each plano-convex lens are coated with an 808nm anti-reflection film, and the transmittance T>95%. Reflector 1 is a plano-concave mirror, one side of the cavity is concave, both sides are ...
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