Sealing design is an effective way to prevent pollution of high power laser. The thermal stress and installation distortion of sealed optical window seriously affect the quality of laser beam. Based on the design scheme of glueless welding seal, this paper fully considering the material, absorption rate and welding layer interaction of the optical window and the base, combined with the finite element simulation method, the distortion of the sapphire and fused silica optical window surface caused by temperature drift and the installation stress was calculated. through the optimization and simulation of the V-shaped flexible release form of the installation stress, the physical model of the optimal design is obtained. Then, the temperature field, deformation and refractive index distribution of the optical window assembly is analyzed during the TEM00 mode Gaussian beam lasing process and the effect of optical window surface distortion, defocusing amount and beam quality degradation with lasting time is calculated. At last, the influence of the change of the internal and external pressure difference is calculated. The results show that the leakage rate after welding is better than 10-12Pa·m3/s, RMS of the mounting surface accuracy is 0.013 λ. The laser power is 10kw and the light lasting time is 120s, the laser beam quality degradation rate β < 1.1, the relax meets the system requirements. The research results provide an important reference for the design, simulation analysis, laser transmission beam quality control and correction of high-power laser anti-pollution and sealed light window components.
Since the difference between the film and the quartz, there are problems in metallization process such as low bonding
strength, poor wettability and the film stress; combined with the actual situation, carried out a series of exploration of the
above problems, take different measures to solve the practical problems.
With method of fixing wire in the high power pulsed xenon lamp tube, an experimental device of double lamp series
was established to simulate the actual working environment of the xenon lamp. The experimental results show that the
thermal damage with the pre delay time of 150μs is much more serious compared with the pre delay time of 250μs. The
reason could be that the metastable particles formed by pre discharge are uneven with the former. The tube pale first
appears near the left lamp anode and the right lamp cathode. The possible reason is that bifurcates and shifts of the
plasma discharge channel are affected by the wire. The test results show that the main reason of thermal damage is that
the temperature of discharge plasma is uneven inside the tube. By improving the structure of the lamp box and
optimizing the pre delay time, the discharge plasma temperature can be decreased for the avoidance of the thermal
damage.
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