Device and method for improving repetition frequency of transverse excitation atmospheric pressure CO2 laser

Abstract

The invention discloses a device and method for improving repetition frequency of a transverse excitation atmospheric pressure CO2 laser, and the device comprises a cavity which is of a hollow structure and plays a role in a working gas vacuum container and supporting protection; the annular discharge unit array is arranged in the cavity and comprises a plurality of discharge units, and each discharge unit comprises a pair of discharge electrodes; the tail mirror is arranged on the axis of the discharge area of each pair of discharge electrodes and serves as a reflecting mirror; the rotatable corner reflector is arranged on one side, far away from the tail mirror, of the exterior of the cavity; and the output mirror is arranged on the cavity axis in the cavity, and forms a resonant cavity with the tail mirror and the corner reflector. According to the invention, a turning resonant cavity rotating at a high speed is formed by a rotating corner reflector and an annularly distributed electrode array, rapid replacement of gas in a discharge area is realized through rapid switching of electrodes, and high repetition frequency output of the TEACO2 laser is realized.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a method for increasing the transverse excitation atmospheric pressure CO 2 Apparatus and method for laser repetition rate. Background technique [0002] Lateral Excitation Atmospheric Pressure CO 2 Laser, also known as TEA (Transversely Excited Atmospheric) CO 2 Laser is a kind of laser excited by pulse discharge, the output band is 9-11μm, it has good atmospheric transmission performance and high pulse peak power (MW level), and is widely used in laser processing, spectral detection, photoelectric countermeasures, etc. field. With the further development of various fields and the diversification of applications in recent years, the improvement of TEACO 2 The repetition rate of the laser has become a technical problem to be solved urgently. [0003] TEA CO 2 The laser will produce unfavorable conditions such as gas decomposition and impurity gas during each disc...

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Problems solved by technology

[0003] TEA CO 2 The laser will produce unfavorable conditions such as gas decomposition and impurity gas during each discharge process, which requires a short recovery time

To achieve repeated frequency work, the replacement of the gas in the discharge area (or cleaning) must be completed before the start of the next discharge, otherwise the stability of the next discharge will be greatly reduced, resulting in arcing

[0004] Under the condition of no active gas circulation, the plasma shock effect and natural diffusion effect generated by the laser pulse discharge have a certain cleaning effect on the gas between the electrodes, but its achievable repetition frequency is limited, generally <5Hz

Under the condition of adding active gas circulation, for example, in the traditional scheme, the gas is forced to reach a certain flow rate by means of a fan, which can achieve higher repetition frequency. Due to a series of reasons such as restrictions, there is a technical bottleneck in increasing the repetition rate

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