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Thermal-induced two dimensional beam distortion in planar waveguide amplifiers.

Xiao-Jun Wang¹, Wei-Wei Ke, Hua Su

¹Institute of Applied Physics and Computational Mathematics, Beijing 100094, China. wang_xiaojun@iapcm.ac.cn

|August 14, 2013

Summary

This summary is machine-generated.

This study investigates thermal distortions in solid-state planar waveguide (PWG) laser amplifiers. Single-mode PWGs exhibit less thermal distortion than multi-mode ones, crucial for beam quality.

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Area of Science:

Optics and Photonics
Laser Physics
Materials Science

Background:

Solid-state planar waveguide (PWG) laser amplifiers are critical components in various laser systems.
Thermal gradients, arising from cooling and pumping inhomogeneity, significantly impact amplifier performance and beam quality.
Understanding mode characteristics under thermal stress is essential for optimizing laser design.

Purpose of the Study:

To theoretically investigate the mode characteristics in solid-state PWG laser amplifiers.
To analyze the effects of temperature gradients and refractive index variations on mode distortions.
To compare thermal distortion effects in single-mode versus multi-mode PWGs.

Main Methods:

Analytical solution of the vector wave equation using the perturbation method for refractive index variations dominated by low spatial frequencies.
Modeling of temperature gradients caused by cooling across the thickness and pumping inhomogeneity along the width.
Illustration of crossing mode distortions due to two-dimensional index variations.

Main Results:

Phase aberration along the width coordinate significantly degrades beam quality, similar to zigzag slab amplifiers.
Mode profiles are demonstrably altered by index variations in both thickness and width directions.
Single-mode or few-mode PWGs experience less severe thermal-induced distortion across the thickness compared to multi-mode PWGs.

Conclusions:

Two-dimensional thermal index variations induce complex mode distortions in PWG laser amplifiers.
The degree of thermal distortion is dependent on the number of modes supported by the waveguide.
Minimizing thermal effects in single-mode PWGs is key to preserving high beam quality in advanced laser systems.