title: Beam quality improvement by joint compensation of amplitude and phase.
abstract: The M² factor could be decomposed as amplitude term and phase term. A method to improve the beam quality of laser beams is proposed. In our method, the amplitude and phase of a laser beam are both compensated in order to improve the beam quality completely. In experiment, a laser amplifier is set to modulate the amplitude to Gaussian type, and a deformable mirror is used to compensate the phase aberration. The laser beam is well compensated by our method; the beam quality factor of the laser is improved from 1.7 to 1.1.
authors.affiliation: State Key Laboratory of Tribology, Center for Photonics and Electronics, Department of Precision Instruments, Tsinghua University, Beijing, China.
authors.forename: M L
authors.initials: ML
authors.lastname: Gong
authors.forename: Yuntao
authors.initials: Y
authors.lastname: Qiu
authors.forename: Lei
authors.initials: L
authors.lastname: Huang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Liu
authors.forename: Ping
authors.initials: P
authors.lastname: Yan
authors.forename: H T
authors.initials: HT
authors.lastname: Zhang