In-cavity aberration detection system and cavity regulating method for lineal confocal unstable cavity

Abstract

The invention relates to a system for adjusting the confocal unsteady cavity and detecting the optical aberration, characterized in that it comprises a He-Ne light source, a confocal unsteady cavity lacuna, a light beam matching telescope, a Hageman sensor, a four-quadrant intensity sensor, an image collecting card and a computer, wherein the confocal unsteady cavity lacuna comprises the 45 deg. reflecting mirror group, coupling output mirrors, convex reflecting mirrors and concave reflecting mirrors. The invention can adjust the optical cavity coaxials quickly, and can detect, process and decide the optical aberration in the cavity.

Description

Technical field [0001] The invention relates to an intracavity aberration detection system of a resonant cavity used in an optical detection system and a cavity tuning method thereof, in particular to a positive branch confocal unstable cavity tuning and aberration detection system and a cavity tuning method thereof. Background technique [0002] Since the working wavelength of lasers with positive branch confocal unstable cavity structure is generally in the infrared region, it is very important whether the resonator is adjusted before working. This is one of the important prerequisites to ensure better beam quality output by the resonator. At present, some predecessors have made some explorations and attempts in this regard. [0003] Jack Hanlon et al propose a method in "Alignment Technique for Unstable Resonators", Jack Hanlon and Steve Aiken, Applied Optics, Vol.13, No.11, November1974, pp.2461, that is, insert a strip near the concave cavity mirror The 45° mirror of t...

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Problems solved by technology

Although this method can intuitively see the near-field and far-field intensity modes of the beam, the obvious disadvantage is that it cannot directly reflect the phase characteristics of the beam, and it does not subdivide the comprehensive effect reflected into each order of optical aberration. meaning is not obvious

[0005] D.Anafi et al. studied positive branch confocal cavity CO in "Intracavity Adaptive Optics.2: Tilt Correction performance", Applied Optics, Vol. 2 In the adaptive optics correction of laser intracavity aberration, an intracavity beam splitter (Intracavity BeamSplitter) with a reflectivity of 3% is placed near the intracavity coupling output mirror to directly detect the intracavity intensity mode. The advantage is that it can directly reflect Intra-cavity light intensity mode, but its disadvantage is that its own aberration may directly affect the coupled output cavity mode, and even generate high-order modes, and this type of device is generally not resistant to strong light, so it cannot be directly placed in a high-energy laser. detection

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