An acousto-optical imaging spectrometer for astrophysical measurements

Hyperspectral imaging acousto-optic system with spatial filtering for optical phase visualization

“…In contrast to previously reported acousto-optic HSI systems, 10,11,29,30,38,39,41 our schemes are based on a spatial filter and a single AOTF as a monochromator in the detection part of the optical scheme. Lower spatial frequencies at jkj < k min are blocked by the mask, resulting in suppression of uniform background in the image.…”

“…Strictly speaking, an AOTF is not an axially symmetrical optical element; therefore, it can cause astigmatism and angular dispersion. 30 However, the angular dispersion is cancelled in the confocal scheme, 38 and astigmatism is minimized if the diffracted beam is parallel to the input one.…”

“…23,24 Our research focuses on the acousto-optic HSI method because of its high spectral and spatial resolution and adaptivity of the angular transfer function. [25][26][27][28][29][30] An AOTF usually is used as a wide-field tunable monochromator. Ultrasound induces a dynamical phase grating in crystal volume, and diffracted wavelength is determined by the frequency of ultrasound.…”

Measurement of amplified binary-modulated chirped laser pulses generated by different acousto-optic pulse shaping algorithms

“…Anikin et al showed that there are two types of angular dispersion in AO filters [34]. The first type of angular chirp is caused by dispersion of birefringence and manifests itself as beam scanning under phase matching condition.…”