Pulse gas laser intracavity flow field measurement device based on four-quadrant detector

Abstract

The invention discloses a pulse gas laser intracavity flow field measurement device based on a four-quadrant detector. The pulse gas laser intracavity flow field measurement device comprises a detection light source, a detection light receiving system and a signal processing system. A light beam sent out by the detection light source is parallel to the optical axis direction of a pulse gas laser. The detection light receiving system comprises a four-quadrant photoelectric detector, a photosensitive face faces towards a detection area and is perpendicular to a detection light beam to be used for receiving the detection laser light beam, and signals of the four-quadrant photoelectric detector can be processed by a signal processing system to obtain laser wave transmission characteristic parameters. The pulse gas laser intracavity flow field measurement device is simple in structure and convenient to operate. The four-quadrant photosensitive sensor simplifies an experiment device. Laser wave disturbance and transmission direction of the laser wave can be judged according to movement of the center of a light spot of the four-quadrant photosensitive detector to improve detection flexibility. Simultaneously, a dichroic mirror is used to separate the detection light beam form laser of the pulse gas laser. The laser oscillation can simultaneously obtain real-time test results to overcome the defect that thermal deposition in non-laser resonant cavity test discharging area is high.

Description

technical field [0001] The invention belongs to the technical field of optical measurement, and relates to a device for measuring flow field fluctuations, in particular to a device for measuring shock wave propagation characteristics in a flow field based on a four-quadrant photoelectric detector, using each quadrant of the four-quadrant photoelectric detector The output change realizes the measurement of the propagation direction of the shock wave and its disturbance size. This method is especially suitable for the measurement of gas flow field disturbance in pulsed gas lasers. Background technique [0002] Pulsed gas laser pumped by pulsed discharge has the characteristics of high repetition rate, high energy and low cost, and has been widely used in industry, such as integrated circuit lithography, laser medical treatment and industrial processing. During the working process of the pulsed gas laser, due to the large instantaneous injection energy in the limited space, sh...

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Problems solved by technology

Although the disturbance of the shock wave in the flow field can be obtained by using this device, the method cannot accurately detect the propagation direction of the shock wave

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