Active phase locking of a tiled two-grating assembly for high-energy laser pulse compression using simultaneous controls from far-field profiles and interferometry

A prototype study on active phase locking of a tiled two-grating assembly (TTGA) using four electronic nanometric actuators has been reported, for its use in high-energy laser pulse compression. Measurement and correction of various phase errors of a TTGA have been demonstrated with a precision of s...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2017-04, Vol.123 (4), p.1-11, Article 117
Main Authors: Sharma, A. K., Joshi, A. S., Naik, P. A., Gupta, P. D.
Format: Article
Language:English
Subjects:
Active control
Applied physics
Assembly
Energy consumption
Energy measurement
Engineering
Interferometry
Laser beams
Lasers
Optical Devices
Optics
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Power spectra
Pulse compression
Quantum Optics
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Summary:A prototype study on active phase locking of a tiled two-grating assembly (TTGA) using four electronic nanometric actuators has been reported, for its use in high-energy laser pulse compression. Measurement and correction of various phase errors of a TTGA have been demonstrated with a precision of sub-50 nm in differential longitudinal translational and sub-10 µrad in differential angular errors using controls derived from simultaneous recording of laser interferogram and far-field profiles of reflected and diffracted beams from TTGA differentiating in-plane rotation with respect to tip error, which is otherwise difficult in the case of using interferometry alone. Multiple-level intensities in the thresholds of the power spectra of apodized interferogram and far-field profiles have been adapted to estimate spatial frequencies and beam peak positions with sub-pixel accuracies.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-017-6682-2