A vacuum ultraviolet laser absolute energy measuring device

Abstract

The invention relates to a device capable of measuring the absolute energy value of a vacuum ultraviolet laser, which belongs to the field of photoelectric technology. The present invention comprises an airtight container and a valve thereof, wherein the airtight container is filled with a target gas, and the valve is used to control the air intake of the airtight container; the airtight container is provided with: a first cup-shaped electrode, The ammeter is connected to the positive pole of the power supply; the cup-shaped accelerating electrode has a hole in the middle, and the opening is opposite to the cup mouth of the first cup-shaped electrode; the shielding barrel is grounded and cylindrical, with a hole in the center axis, and the hole is in line with the cup The hole of the shaped accelerating electrode is opposite; the second cup-shaped electrode is grounded through the picoammeter, and the opening of the cup is opposite to the opening of the shielding barrel. The invention can measure the absolute energy of the vacuum ultraviolet in real time, is a completely 'transparent' device, does not affect the use of the laser at the back end when measuring the energy, and has a certain degree of tolerance to the position drift of the laser.

Description

technical field [0001] The invention relates to a device capable of measuring the absolute energy value of a vacuum ultraviolet laser, which belongs to the field of photoelectric technology. Background technique [0002] With the continuous development of laser technology, lasers are widely used in military, medical, industrial and scientific research fields, and the measurement of laser parameters is becoming more and more important. Among them, the measurement of laser energy is particularly important. Analyzing the effect of laser light on matter is very important. [0003] At present, the measurement of laser energy generally uses photodiodes, thermal probes and pyroelectric probes: [0004] A photodiode is actually a semiconductor p-n junction. When a photon of sufficient energy is incident on the p-n junction, the p-n junction will emit electrons, thereby generating an electric current in it. Photodiodes can work in either photovoltaic mode or photoconductive mode. ...

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Problems solved by technology

[0007] The above three measurement materials are undoubtedly very convenient for the measurement of conventional laser energy, but they are all equivalent to converting laser energy into other proportional means of expression, and they all need to be calibrated, that is to say, what they measure is The relative energy value of the laser cannot directly obtain the absolute energy of the laser, and due to the loss of use, the measured value often needs to be calibrated and cannot be measured in real time; and they are powerless for ultra-short pulses and short-wavelength vacuum ultraviolet light (no calibration reference, Or the power is too high to damage the probe)

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