Auxiliary adjusting instrument of light spot center of expanded narrow laser beam

Abstract

The invention relates to an auxiliary adjusting instrument of the light spot center of an expanded narrow laser beam, belonging to the laser instrument field. The instrument is a screen which is fixed on a magnetic base by a bracket; the center of the screen is provided with a hole for penetrating the narrow light beam through, the upper part, the lower part; the left part and the right part of the screen are provided with four grooves which take the center of the screen as the symmetrical center and are mutually perpendicular, and the middle of each groove is provided with an insulating plate which divides the groove into two slits; and four photoresistors which are equal in resistivity and consistent in characteristic are across the insulating plates and slide in the slots; two pins of each photoresistor are inserted in the slits at both sides of the insulating plate; the screen is provided with a plurality of annular scales taking the center of the screen as the circle center; the edge of the screen is provided with two observation holes; two light-emitting diodes are arranged at the back sides of the observation holes; the pins of the four photoresistors are arranged at the back side of the screen and are connected into a bridge circuit, and the voltage difference of midpoints of two arms of the bridge circuit is amplified by an operational amplification circuit and an output end of the bridge circuit is connected with the light-emitting diodes. The instrument is used for judging whether the laser spot center of the laser beam expanded by a beam expander is height-equal and coaxial with the incident beam.

Description

technical field [0001] The invention relates to an optical experiment instrument, in particular to an auxiliary adjustment instrument capable of quickly and intuitively judging whether the center of the expanded beam spot is coaxial with the contour of the incident light after a thin laser beam is expanded by a beam expander, belonging to optical Instrument field. Background technique [0002] In optical experiments, it is often necessary to expand a thin laser beam with a diameter of 1 to 2 mm through a beam expander to obtain a larger spot. The center is coaxial with the height of the incident ray. If the spot center after beam expansion is not at the same height as the incident light, it will affect the results of optical experiments. However, currently, there is no instrument to detect whether the center of the beam spot after beam expansion is coaxial with the contour of the incident light, and it is usually observed and judged with the naked eye. Therefore, it is dif...

AI Technical Summary

Problems solved by technology

If the spot center after beam expansion is not at the same height as the incident light, it will affect the results of optical experiments

However, at present, there is no instrument to detect whether the center of the beam spot after beam expansion is coaxial with the contour of the incident light, and it is usually observed and judged by the naked eye. Therefore, it is difficult to ensure the accuracy of adjustment

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