title: Adaptive wavefront sensor based on the Talbot phenomenon.
abstract: A new adaptive method of wavefront sensing is proposed and demonstrated. The method is based on the Talbot self-imaging effect, which is observed in an illuminating light beam with strong second-order aberration. Compensation of defocus and astigmatism is achieved with an appropriate choice of size of the rectangular unit cell of the diffraction grating, which is performed iteratively. A liquid-crystal spatial light modulator is used for this purpose. Self-imaging of rectangular grating in the astigmatic light beam is demonstrated experimentally. High-order aberrations are detected with respect to the compensated second-order aberration. The comparative results of wavefront sensing with a Shack-Hartmann sensor and the proposed sensor are adduced.
authors.forename: Dmytro V
authors.initials: DV
authors.lastname: Podanchuk
authors.forename: Andrey A
authors.initials: AA
authors.lastname: Goloborodko
authors.forename: Myhailo M
authors.initials: MM
authors.lastname: Kotov
authors.forename: Andrey V
authors.initials: AV
authors.lastname: Kovalenko
authors.forename: Vitalij N
authors.initials: VN
authors.lastname: Kurashov
authors.forename: Volodymyr P
authors.initials: VP
authors.lastname: Dan'ko