Beam alignment is used to control the pointing, rotation, and position of a beam automatically. We give an overview of the beam alignment system for a four-pass amplifier system. The coupling relationships between dependent quantities and deviations thereof for parameters of key optical elements are analyzed using matrix optics techniques. The rotation characteristics of a near field are discussed. The characteristics of the four-pass adjustment in the cavity spatial filter are shown and the output characteristics are provided. Finally, we develop an adjustment procedure.
© 2009 Optical Society of America
Lasers and Laser Optics
Original Manuscript: November 14, 2008
Revised Manuscript: January 11, 2009
Manuscript Accepted: February 13, 2009
Published: March 6, 2009
Yan-Qi Gao, Bao-Qiang Zhu, Dai-Zhong Liu, Xiao-Feng Liu, and Zun-Qi Lin, "Characteristics of beam alignment in a high power four-pass laser amplifier," Appl. Opt. 48, 1591-1597 (2009)