Compensation of low order aberrations with reflective beam shaping system

Wenguang Liu; Qiong Zhou; Dianyu Gu; Zongfu Jiang

doi:10.1117/12.2051024

1 May 2014 Compensation of low order aberrations with reflective beam shaping system

Wenguang Liu, Qiong Zhou, Dianyu Gu, Zongfu Jiang

Proceedings Volume 9135, Laser Sources and Applications II; 913511 (2014) https://doi.org/10.1117/12.2051024
Event: SPIE Photonics Europe, 2014, Brussels, Belgium

Abstract

Compensation of low order aberrations is essential for high power solid state slab laser. With the increase of output power, the peak-to-valley of wavefront distortion increase to dozens of micrometer. It’s difficult to control the wavefront with deformable mirrors which always has limited stroke(<20μm). In this paper, a reflective beam shaping system is designed to shaping the beam spot from rectangular to squarer. The beam shaping system consists of two x-oriented cylindrical mirrors and two y-oriented cylindrical mirrors. Simulations of PID control algorithm for actively compensating of low-order aberrations with reflective beam shaping system are presented. It shows that different combinations of defocus, 0o astigmatism and 45° astigmatism, which is the main contributor of beam aberrations in slab laser, can be well compensated by adjustment of distance and rotation angle of mirrors. And the convergence is fast when the control error signal is set to a suitable combination of low order Zernike coefficients. For beam with wave aberrations (PtV=82.6λ, RMS=18.2λ, Z4=23.6, Z5=7.1, Z6=19.6), the adjustment of distance between mirrors is below 100mm, and the rotation angle about z-axis is below 2 degree. The wavefront aberrations are decreased to a low level (PV=0.16λ, RMS=0.04λ) which can be easily corrected later with DM.

Citation Download Citation

Wenguang Liu, Qiong Zhou, Dianyu Gu, and Zongfu Jiang "Compensation of low order aberrations with reflective beam shaping system", Proc. SPIE 9135, Laser Sources and Applications II, 913511 (1 May 2014); https://doi.org/10.1117/12.2051024

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available