Femtojoule level nanosecond pulse laser energy detection device

Abstract

The invention discloses a femtojoule level nanosecond pulse laser energy detection device, belonging to the technical field of optical measurement. The femtojoule level nanosecond pulse laser energy detection device comprises a convergent mirror assembly, a detector, a drive circuit and an amplification assembly, wherein the convergent mirror assembly is used for converging parallel light beams emitted from a femtojoule level nanosecond pulse laser light source to the light-sensitive surface of the detector; a PMT (Photo Multiplier Tube) detector with a silver oxygen cesium photocathode is selected as the detector, the drive circuit enables the detector to have high-sensitivity and low-dark current output through a potential-divider network and a filter network which are designed by proper high-voltage output and are matched; the bandwidth of the amplification assembly is more than 200MHz, and the output of the detector can be amplified 64 times, 512 times or 4096 times so as to meet the acquisition requirement of a subsequent application device. According to the femtojoule level nanosecond pulse laser energy detection device, the detection problem of femtojoule level nanosecond pulse laser is solved, and the amplification output of an ultra-high-speed weak pulse signal is realized.

Description

technical field [0001] The invention belongs to the technical field of optical metrology, and mainly relates to a set of laser energy detection devices, in particular to a set of femtojoule-level nanosecond pulse laser energy detection devices. Background technique [0002] For laser micro-energy detection with a wavelength of 1.064 μm, a pulse width of 5 ns to 1 μs, and an energy of 1 fJ to 500 fJ, it is a difficult problem to achieve accurate measurement, whether at home or abroad. British National Physical Laboratory (NPL), German Federal Institute of Physics and Technology (PTB), Russian All-Russian Institute of Optical Physics (VNIIOFI) in 1fJ~5×10 5 A lot of research has been done on the micro-energy detection of fJ, but the detection device and detection method of the femtojoke laser energy less than 500fJ have not been disclosed. At present, only the National Institute of Standards and Technology (NIST) of the United States has disclosed the calibration capability o...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a set of femtojoule-level nanosecond pulse laser energy detection device to solve the femtojoule-level nanosecond pulse with a wavelength of 1.064 μm, an energy of 1fJ~1pJ, and a pulse width of 5ns~1μs The problem of energy detection of laser light source

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