Design and comparison of laser windows for high-power lasers
2014
High-power laser systems are getting more and more widely used in industry and military affairs. It is necessary to develop
a high-power laser system which can operate over long periods of time without appreciable degradation in performance.
When a high-energy laser beam transmits through a laser window, it is possible that the permanent damage is caused to the
window because of the energy absorption by window materials. So, when we design a high-power laser system, a suitable
laser window material must be selected and the laser damage threshold of the window must be known.
In this paper, a thermal analysis model of high-power laser window is established, and the relationship between the laser
intensity and the thermal-stress field distribution is studied by deducing the formulas through utilizing the
integral-transform method. The influence of window radius, thickness and laser intensity on the temperature and stress
field distributions is analyzed. Then, the performance of K9 glass and the fused silica glass is compared, and the
laser-induced damage mechanism is analyzed. Finally, the damage thresholds of laser windows are calculated. The results
show that compared with K9 glass, the fused silica glass has a higher damage threshold due to its good thermodynamic
properties. The presented theoretical analysis and simulation results are helpful for the design and selection of high-power
laser windows.
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