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.

Inactive Publication Date: 2011-01-19
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology

The existing technologies for obtaining a hollow laser beam are to shape the laser beam emitted by the resonator through an optical device outside the resonator to obtain a hollow laser beam. This kind of scheme is not only complicated in structure, but also has a large energy loss, and also leads to The laser beam becomes less coherent

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  • Resonant cavity capable of obtaining hollow laser beams
  • Resonant cavity capable of obtaining hollow laser beams
  • Resonant cavity capable of obtaining hollow laser beams

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Embodiment Construction

[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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Abstract

The invention relates to a resonant cavity capable of obtaining hollow laser beams, which can directly output hollow conical laser beams, belonging to the field of laser technology. The current technology for obtaining the hollow laser beams uses an optical device outside the resonant cavity for reshaping the laser beams emitted by the resonant cavity to obtain the hollow laser beams, and the scheme not only has a complex structure, but also has large energy loss. The resonant cavity capable of obtaining the hollow laser beams of the invention comprises a reflector, a laser gain medium and an output coupling mirror, wherein the material of the output coupling mirror is biaxial crystal, and one optical axis of the biaxial crystal is parallel to the axial line of the resonant cavity.

Description

technical field [0001] The invention relates to a resonant cavity capable of obtaining a hollow laser beam, capable of directly outputting a hollow conical laser beam, and belongs to the field of laser technology. Background technique [0002] With the development of laser technology, hollow laser beams are not only widely used in biology, laser processing and atom cooling, but also can be applied to scanning imaging, remote sensing guidance, ranging and other fields. The existing technologies for obtaining a hollow laser beam are to shape the laser beam emitted by the resonator through an optical device outside the resonator to obtain a hollow laser beam. This kind of scheme is not only complicated in structure, but also has a large energy loss, and also leads to The degree of coherence of the laser beam is reduced. [0003] In the field of optical crystal materials, biaxial crystals have conical refraction effects. Contents of the invention [0004] In order to achieve...

Claims

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Application Information

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IPC IPC(8): H01S3/08
Inventor 吕彦飞夏菁
Owner CHANGCHUN UNIV OF SCI & TECH
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