A method and device for continually adjusted attenuation of high energy laser

Bin Wu; Yunkun Ni; Junhong Su; Junqi Xu; Shenjiang Wu

doi:10.1117/12.3014851

4 March 2024 A method and device for continually adjusted attenuation of high energy laser

Bin Wu, Yunkun Ni, Junhong Su, Junqi Xu, Shenjiang Wu

Author Affiliations +

Proceedings Volume 13070, Speckle 2023: VIII International Conference on Speckle Metrology; 130700N (2024) https://doi.org/10.1117/12.3014851
Event: Speckle 2023: VIII International Conference on Speckle Metrology, 2023, Xi'an, China

Abstract

The laser attenuation device has always been an important component of the LIDT system,the attenuation adjustment ability of the laser attenuation device directly affects the performance of the testing system.The continuous attenuation device of high energy laser is achieved by combining polarization cube with rotating half wave plate,when the angle of the rotating half wave plate changes from 0° to 45°, the transmissivity of the attenuator changes from 99.9% to 0.3%.This design scheme reduces the volume of the attenuation device while achieving continuous adjustment of the transmissivity.Adopting optical devices with large aperture and high damage threshold, the maximum single pulse energy that the system can withstand is 2J@1064nm. The attenuated energy is tested by using a Ophir PE50BF-DIF-C pyroelectric energy sensor,the results show that the laser energy transmissivity can be continuously adjusted within the range of [0.3%,99.9%]. Using Beamtech China SGR20 laser, it can work stably with the power density of 2J@1064nm whose experimental results meet the design re-quirements. Compared with the traditional optical variable attenuator,this design has the advantages of large dynamic regulation range, stable attenuation and continuous regulation.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Bin Wu, Yunkun Ni, Junhong Su, Junqi Xu, and Shenjiang Wu "A method and device for continually adjusted attenuation of high energy laser", Proc. SPIE 13070, Speckle 2023: VIII International Conference on Speckle Metrology, 130700N (4 March 2024); https://doi.org/10.1117/12.3014851

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KEYWORDS

Laser energy

Transmittance

Wave plates

Polarized light

Laser damage threshold

Optical attenuators

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