Method for simultaneously measuring output single-pulse energy and waveforms of lasers

Abstract

The invention discloses a method for simultaneously measuring the output single-pulse energy and the waveforms of lasers; the method comprises the steps that: the design of a detection optical path, and the calibration and the actual detection of a photoelectric detector; the photoelectric detector acquires a plurality of groups of pulse waveforms which correspond to different energy, and a calibration optical path energy detection system measures corresponding energy; a computer first pre-processes the actually measured waveforms, eliminates background noise, then integrates the processed waveforms, obtains an area integral value between a waveform curve and the horizontal axis of time, and finally fits a relation curve between the area integral value and an actually measured energy value as a calibration curve of the photoelectric detector. During an actual detection process, the computer eliminates the background noise for the actually measured pulse and integrates the actually measured pulse, obtains the area integral value, then inserts a value in the calibration curve, and obtains the pulse energy. The method for simultaneously measuring the output single-pulse energy and the waveforms of the lasers uses a sensor to measure the parameters of a plurality of lasers, simplifies a measurement system, saves the cost, and is applicable to occasions on which the output energy and the waveforms of the lasers need to be monitored in real time.

Description

technical field [0001] The invention belongs to the field of laser output parameter detection, in particular to a method capable of simultaneously measuring the energy and waveform of a single pulse output by a laser. Background technique [0002] In the actual application process, the output energy and pulse waveform of the pulsed laser are the parameters we mainly pay attention to. At present, the detection of laser energy mainly relies on a special light energy meter, and the detection of laser pulse waveform mainly relies on the combination of photodetectors and oscilloscopes. . Energy detection and waveform detection are mostly carried out separately, and the detection process is relatively complicated. In fact, the photodetector used to measure the pulse waveform can be used as a laser energy meter at the same time after being calibrated. Based on this principle, this patent proposes a photodetector-based method that can simultaneously measure the single pulse energy...

AI Technical Summary

Problems solved by technology

The essential principle is that the output beam of the laser is sampled by a spectroscope or frosted glass, and then input to an energy probe, CCD, photodiode, photodetector, spectrometer, etc., and the signals collected by these instruments are collected by a data acquisition card and input to a computer. The analysis and processing of the computer finally obtains the parameters to be measured. It can be seen that in the method described in this patent, the measurement of each laser parameter still relies on a separate special instrument, such as measuring the output laser energy with an energy probe and measuring the output laser energy with a photodiode. Output laser pulse width, etc. Therefore, this patent only provides a more compact laser multi-parameter measuring instrument, but the type and number of probes or sensors required have not been reduced, so the structure has not been simplified

In addition, a document (2007, Vol.12 NO.34:P1732-1735) on "China Laser" described a laser power / energy meter based on the laser-induced thermoelectric voltage effect, which can measure The energy value of the laser pulse can also record the pulse waveform. The essential principle is that after the laser acts on the LCMO film, a thermoelectric voltage can be induced in the film. There is a linear relationship between the peak value of the thermoelectric voltage and the pulse laser energy. Although this method In principle, the method of simultaneously measuring the laser pulse energy value and pulse waveform can also be realized, but the measurement of laser output parameters with LCMO thin films is still in the research stage and is quite immature. At the current level of technology, it cannot be used in production practice.

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