Cavity mirror misalignment monitoring system based on positive-branch confocal unstable resonator and monitoring method thereof
A monitoring system and unstable cavity technology, which are applied in the field of monitoring systems for the misalignment of laser resonator cavity mirrors, can solve the problems of uneven near-field light intensity distribution, beam eccentricity, and increased tilt aberration, and achieve a shorter waiting time. Effect
Inactive Publication Date: 2010-06-30
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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[0006] The above-mentioned studies have made a useful exploration of the influence of intracavity tilt aberration on the output mode of the resonator, but none of them has touched on a key issue: due to the misalignment of the intracavity components, there may be some commonality in the extracavity monitoring. In short, the concave There are some similarities between mirror misalignment and convex mirror misalignment, for example, they will cause uneven distribution of light intensity in the near field, increase in beam decentering and oblique aberration
At present, there are no literature reports on the separate monitoring methods for different components in the unstable cavity.
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[0030] Such as figure 1 As shown, the intracavity comprehensive aberration detection system of the present invention consists of He-Ne light source 1, unstable cavity mirror, beam matching system 6, H-S wavefront sensor 7, beam splitter 8, autocollimator 9, image acquisition and Data processing computer 10, focusing lens 11, centroid detection CCD 12, stepper motor and its controller 13, 14, wherein the unstable cavity is composed of 45° mirror group 2, coupling output mirror 3, convex mirror 4, concave mirror 5 Composition, the angle between two mirrors in the 45 ° reflector group 2 is 90 °, the convex mirror 4 is located before the reflector 1 with the coupling hole in the 45 ° reflector group 2, and the position is close to the concave mirror 5 (the distance between the two is 200° ~300mm is suitable for the following reasons: firstly, the cavity mirror mechanical adjustment mechanism itself has a certain size, so the spacing cannot be zero; secondly, in order to avoid the ...
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Disclosed is a method for positive-branch confocal unstable cavity mirror disorder monitoring which is characterized in that: monitor system comprising He-Ne light source, unstable cavity mirror, beam splitter, focusing lens, light beam mass center detecting CCD, light beam matching telescope, stepper motor and controller, H-S wave front sensor, image collecting card, autocollimator and data collect process computer; wherein the positive-branch confocal unstable cavity comprising 45 degree reflector group, coupling output mirror, convex reflector and concave reflector. The inventive method has the advantages of being able to judge which optical component is disordered in cavity easily and of being able to calculate disorder value accurately.
Description
Technical field [0001] The invention relates to a monitoring system and a monitoring method for the misalignment of a laser resonator cavity mirror, in particular to a system for quickly judging the misalignment of different components in an unstable confocal cavity based on positive branches and accurately measuring the misalignment amount and a measurement method thereof. Background technique [0002] Since the working wavelength of lasers with positive branch confocal unstable cavity structure is generally in the infrared region (for example, 1.315 μm, 3.8 μm), it is found that the misalignment of the cavity mirror will directly bring about uneven distribution of near-field light intensity and eccentricity of the beam. And if the detuning angle of the cavity mirror is large, it will directly bring about the increase of many optical aberrations. Therefore, how to monitor the detuning of the cavity mirror in real time and adjust it back to the initial calibration position is...
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IPC IPC(8): G01M11/00G01M11/02
Inventor 张翔许冰戴云杨伟
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI