Study of Small-Scale Self-Focusing in High-Power Laser System

Baosuan, 陈宝算 Chen; Junyong, 张军勇 Zhang; Yanli, 张艳丽 Zhang; Dean, 刘德安 Liu; Jianqiang, 朱健强 Zhu

doi:10.3788/lop49.010002

Cited by 2 publications

(1 citation statement)

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“…In a complex high power laser system, the interference of stray light and chief ray can initiate self-focusing under certain conditions. As the path of stray light is complex, self-focusing can be observed even when energy density is below the threshold [7] [8] . Analysis and simulation of complex situation is of great significance.…”

Section: Nonlinear Effect and Self-focusingmentioning

confidence: 98%

Analysis of nonlinear self-focusing phenomenon in high-power laser system based on ray-tracing

Wang

Cen

et al. 2014

SPIE Proceedings

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In high power laser systems, nonlinear effect, one of the key factors of beam wavefront aberration and even irreversible damage to system, has always been one of the top considerations of researchers for decades. A hybrid ray-tracing method for both linear media and nonlinear media based on geometric optics is presented in this paper and realized by programming. In a simple optic system with KDP crystal, an obvious decline of beam quality is observed in high laser power density conditions and a method taking component intervals as compensation of beam quality is proved feasible. Considering the complexity of traditional modeling method based on surfaces, a modeling method based on components is established. Hopefully, the conclusions and flaws of this paper can shed light on relevant work and further research.

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Section: Nonlinear Effect and Self-focusingmentioning

confidence: 98%

Analysis of nonlinear self-focusing phenomenon in high-power laser system based on ray-tracing

Wang

Cen

et al. 2014

SPIE Proceedings

View full text Add to dashboard Cite

show abstract

Influence of phase error of optical elements on optical path design of laser facilities

Xu¹,

Xing-Qiang²,

Ze-Min³

2018

Acta Phys. Sin.

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Optical path design of high power laser facilities should consider several optimization measures such as those that are related to image transmission, ghost avoidance, and stray light management. According to the diffraction optical propagation theory, we study the the influences of wavefront characteristics of large aperture optical components on optimizing the design parameters of optical path in view of increasing the output load. The results show that the arrangement interval of the last stage optical drive can be very useful in improving the output load of the laser facilities if it is controlled to be over 6 m long. In general, a large aperture optical element with a phase error peak value of 0.34 can reduce the near field beam quality of a high-power laser by about 10% and give rise to a maximum decrease of about 21% when the phase error reaches 1.36. Superposition of multiple optical elements with different phase error distribution characteristics can reduce the negative effect of the mid frequency phase error. However, the nonlinear effect of large aperture optical components can aggravate the influence of the intermediate frequency phase error on the damage resistance capacity of the device. Under the premise that the damage threshold of the large caliber optical element is limited to 20 J/cm2, the using of a laser facility with a compact optical path, with an input laser energy density controlled to be below 16.8 J/cm2, will avoid damaging the optical components efficiently. A relatively flexible optical layout can further increase the average energy density of the final output laser and is very beneficial to the enhancing of the output load capacity of the laser facility.

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Study of Small-Scale Self-Focusing in High-Power Laser System

Cited by 2 publications

References 0 publications

Analysis of nonlinear self-focusing phenomenon in high-power laser system based on ray-tracing

Analysis of nonlinear self-focusing phenomenon in high-power laser system based on ray-tracing

Influence of phase error of optical elements on optical path design of laser facilities

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