Wavelength-agile telescope system with diffractive wavefront control and acousto-optic spectral filter

Details Wavelength-agile telescope system with diffractive wavefront control and acousto-optic spectral filter Wavelength-agile telescope system with diffractive wavefront control and acousto-optic spectral filter

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5553..182g&link_type=abstract

Advanced Wavefront Control: Methods, Devices, and Applications II. Edited by Gonglewski, John D.; Gruneisen, Mark T.; Giles, Mi

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Programmable diffractive optics (PDO) based on liquid-crystal (LC) technology has been demonstrated as a wavelength-agile means of compensating large aberrations over limited instantaneous spectral bandwidths. Acousto-optic tunable filters (AOTF) based on acousto-optic Bragg diffraction have been demonstrated as wavelength-agile means for selecting narrow spectral bands from white light with high rejection ratios. These technologies are integrated into a telescope system that includes a conventional primary mirror utilized off axis with more than 40 waves of aberration to view a white-light illuminated object bar chart. A high-resolution LC PDO, situated in a pupil plane, compensates for the large primary mirror aberration. The AOTF, operating in an image plane, rejects light outside a 2 nm spectral band centered about the wavelength at which the modulo-lambda phase profile of the PDO is defined. Wavelength-agile operation is achieved by synchronously tuning the PDO and AOTF over a 100nm spectral range. Near-diffraction-limited image quality is demonstrated.

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