Abstract
In this study, a model is proposed to design and manage the stray light of a compact final optics assembly (FOA) for a high energy laser system. Based on the method we proposed, the high-order stray light can be managed to optimizing the position and angle of the optical elements. A light trap is designed to manage the first-order stray light with high fluence. Applying the method, we provide an experimental demonstration to designing a compact FOA. By comparing the cleaning results with no management testing result, it proves that using the above design and management, it can achieve the great improvement of cleanliness from ISO Class 5 to Class 3, which is significant to improve the output capability of the high energy laser system. In addition, we also verify the stray light by an optical field paper. It demonstrates that the field characteristics and position calculation of stray light are reliable.
Highlights
Final optics assembly (FOA) is the last stage of high power laser equipment, which bears the highest laser energy
When the fluence of stray light is strong on the optical components and structural parts of the terminal, hundreds of thousands of pollution particles will be added to the optical system, which will reduce the lifetime of the optical elements and limit the output energy of the laser system [4,5,6]. erefore, it becomes an important issue in the compact FOA to avoid the deterioration of stray light on the clean environment of the system in the FOA design of the high power laser system, which is important for the improvement of system output energy and the safe operation of the laser system. e FOA design scheme determines the limiting factor of output capability for high power laser facility [7,8,9]
It can be seen from formulas (6) and (7) that the firstorder stray light does not act on the structural parts, and the fluence of stray light at the optical element is less than 1 J/ cm2
Summary
Final optics assembly (FOA) is the last stage of high power laser equipment, which bears the highest laser energy It is composed of frequency crystals, focusing lens, vacuum window, and other expensive transmission optical elements [1,2,3]. Erefore, it becomes an important issue in the compact FOA to avoid the deterioration of stray light on the clean environment of the system in the FOA design of the high power laser system, which is important for the improvement of system output energy and the safe operation of the laser system. It is necessary to avoid high-order stray light focusing on the optical components and structural parts by controlling the distance and angle of the vacuum window and shield. We accomplish the experiment, and the result demonstrates that the compact FOA can achieve the great improvement of cleanliness from ISO Class 5 to Class 3, and the field characteristics and position calculation of stray light are reliable
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