Unstable cavity laser

A laser and unstable cavity technology, applied in the laser field, can solve problems such as large loss of polarized light, loss of light intensity, thermal depolarization, etc., achieve smooth and uniform spatial distribution, high-power laser output, and reduce thermal depolarization loss

Active Publication Date: 2019-06-18
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

However, if the method of directly inserting the polarizer into the unstable resonant cavity, due to the thermal effect of the gain medium, the degree of polarization of the polarized light oscillating in the resonant cavity will decrease, the loss will increase, and the output power will decrease; The thermal depolarization phenomenon makes the polarized light oscillating

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[0030] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the specific embodiments and the accompanying drawings. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts of the present invention.

[0031] The accompanying drawings show a schematic structural diagram of an embodiment of the present invention. The figures are not to scale, some details are exaggerated for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships are only exemplary, and in practice, there may be deviations due to manufacturing tolerance...

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Abstract

The invention discloses an unstable cavity laser. The unstable cavity laser comprises a second reflector (5), and a first reflector (1), a gain medium (2), a curved surface polarization direction controller (3) and a polarizer (4) which are sequentially arranged along an optical axis, wherein the first reflector (1) and the second reflector (5) form an unstable cavity; the curved surface polarization direction controller (3) has a preset thickness, so that the polarization direction of a light beam penetrating through the curved polarization direction controller is rotated at different anglesalong with the increase of the radius of a light spot; the polarizer (4) is arranged according to a Brewster angle; the second reflector (5) is arranged on the optical axis of light reflected or transmitted by the polarizer (4); and the light correspondingly penetrating through the polarizer (4) or the light reflected by the polarizer (4) is output. The curved surface polarization direction controller and the polarizer are used cooperatively, so that the effects of similar Gaussian mirror and output mirror can be realized, and the polarized laser output with high light beam quality can be obtained while the thermal depolarization loss is reduced.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to an unstable cavity laser. Background technique [0002] Solid-state lasers with polarization, high power, and high beam quality have important applications in material processing and scientific research due to their large output energy, high peak power, compact device structure, and long service life. In order to obtain polarized laser light with high power and high beam quality, the prior art mainly adopts the following three methods, but these three methods have the following disadvantages. [0003] 1) Stable resonator: If a stable resonator is used, high output power and high beam quality are often not satisfied at the same time, and the output beam is usually a Gaussian beam, and the beam quality is usually poorer than that of an unstable resonator. [0004] 2) Directly insert the polarizer into the unstable resonator: the appearance of the unstable resonator is a better solu...

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Application Information

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IPC IPC(8): H01S3/08H01S3/10H01S3/106
Inventor 薄勇彭钦军卞奇左军卫许祖彦宗庆霜
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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