Transient thermal blooming of collimated multi-pulse laser propagation in atmosphere

Tian-he Liao; Wei Liu; Qiong Gao

doi:10.1117/12.902422

22 August 2011 Transient thermal blooming of collimated multi-pulse laser propagation in atmosphere

Tian-he Liao, Wei Liu, Qiong Gao

Proceedings Volume 8192, International Symposium on Photoelectronic Detection and Imaging 2011: Laser Sensing and Imaging; and Biological and Medical Applications of Photonics Sensing and Imaging; 81924F (2011) https://doi.org/10.1117/12.902422
Event: International Symposium on Photoelectronic Detection and Imaging 2011, 2011, Beijing, China

Abstract

This paper describes the contents of a general "four-dimensional" computer code for the transient thermal blooming of multi-pulse laser beam propagation. The solutions of the scalar wave equation in Fresnel approximation and the hydrodynamic equations are obtained by means of the discrete Fourier transform method. Based upon the scalar wave equation and the equations of hydrodynamics, the paper makes a model for collimated multi-pulse laser, simulates the transient thermal blooming numerically, and gives the laser beams irradiance distribution by changing respectively the value of the propagation distance, the pulse-repetition rate, the power, and the time. Besides, we simulate the thermal blooming of cw in order to make a contrast with multi-pulse laser. The results show multi-pulse lasers minimize thermal-blooming; if the pulse-repetition rate decreases, thermal blooming decrease, and the quality of the beam is better.

Citation Download Citation

Tian-he Liao, Wei Liu, and Qiong Gao "Transient thermal blooming of collimated multi-pulse laser propagation in atmosphere", Proc. SPIE 8192, International Symposium on Photoelectronic Detection and Imaging 2011: Laser Sensing and Imaging; and Biological and Medical Applications of Photonics Sensing and Imaging, 81924F (22 August 2011); https://doi.org/10.1117/12.902422

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KEYWORDS

Thermal blooming

Atmospheric propagation

Laser beam propagation

Collimation

Continuous wave operation

Optical simulations

Thermal modeling

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