Optical element laser-induced damage characteristic transient measurement device and detection method

Abstract

The invention discloses an optical element laser-induced damage characteristic transient measurement device and detection method. The device comprises a light source, a first spectroscope, a second spectroscope, a first reflector, a second reflector, a light beam shaping and filtering system, a polarization delay control system, a sample table, a damage characteristic online measurement system, anenergy control system, a focusing system, a light beam quality diagnosis system, an optical shutter, an optical trap and a computer. According to the measurement device and detection method of the invention, a strong laser beam is split, one part of the strong laser beam is adopted as a damage test light beam, and the other part of the strong laser beam is adopted as a detection light beam; the polarization delay control system is adopted, the interval time of the detection light beam and the damage test light beam is adjusted; the damage characteristic online measurement system is adopted; the phase information and light intensity information of an irradiated area of an optical element are detected at different moments after the action of the pulse laser, and the three-dimensional form of a damage area and the relative change amount of transmittance distribution are obtained.

Description

technical field [0001] The invention relates to the transient measurement of laser-induced damage characteristics of optical components, in particular to a transient measurement device and detection method of laser-induced damage characteristics of optical components. Background technique [0002] Under high-flux pulsed laser irradiation, optical components are prone to damage, which affects their optical, mechanical, thermal and other properties. Under the action of subsequent pulsed lasers, even small initial damage points may grow rapidly and form larger-sized damage. Points or damaged areas will affect the performance and life of optical components, reduce the output energy of the laser system and the quality of the laser beam, and may endanger the operation safety of the entire high-power laser device. [0003] In view of the short interaction time between pulsed laser and optical materials, researchers have proposed a variety of time-resolved damage transient measureme...

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Problems solved by technology

Among them, the polarization shadow microscopic imaging technology is used to study the damage transient characteristics of fused silica optical materials under the action of nanosecond and picosecond pulsed lasers. Four detection optical paths are used to obtain the lateral direction of the damage area on the surface of fused silica at different times after the pulsed laser is applied. Growth and material splatter images (see prior art 1, S.G.Demos, R.N.Raman, R.A.Negres, et al, Time-resolved imaging of processes associated with exit-surface damage growth in fused silica following exposure to nanosecond laserpulses, Optics Express, 21(4), 4875-4888, 2013), the structure of the test light path is complex, and only the lateral size information of the damaged area can be obtained; the time-resolved digital holography technology uses the ideal beam as a reference, and the test beam passes through the damaged area to obtain the laser irradiation area of ​​the optical element The transient variation of the optical field intensity and phase information (see prior art 2, A.Melninkitis, N.Siaulys, B.Momgaudis, et al, What time-resolved measurements tell us about femtosecond laser damage, Proc.SPIE, 9632 , 96320O / 1-96320O / 11, 2015), susceptible to environmental influences

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