Chromatic aberrations correction for imaging spectrometer based on acousto-optic tunable filter with two transducers.

Area of Science:

• Optics and Photonics
• Spectroscopy
• Optical Engineering

Background:

• Acousto-optic tunable filters (AOTFs) offer wide wavelength ranges and high spectral resolution.
• Long crystals in AOTFs cause chromatic focal shifts, while dual transducers induce angular beam mutations.
• These aberrations complicate the correction of longitudinal and lateral chromatic aberrations in AOTF systems.

Purpose of the Study:

• To quantitatively analyze the chromatic aberrations in AOTF systems.
• To propose a novel optical configuration for correcting these aberrations.
• To evaluate the effectiveness of the proposed configuration in AOTF-based imaging spectrometers.

Main Methods:

• Development of an AOTF optical model for quantitative aberration analysis.
• Design of a novel catadioptric dual-path optical configuration.
• Experimental testing and validation of the proposed configuration.

Main Results:

• Quantitative analysis confirmed the impact of crystal length and transducer arrangement on chromatic aberrations.
• The proposed catadioptric dual-path configuration demonstrated effective correction of both longitudinal and lateral chromatic aberrations.
• Test results validated the improved performance of AOTF-based imaging spectrometers using the novel configuration.

Conclusions:

• The novel catadioptric dual-path configuration is effective in correcting chromatic aberrations in AOTFs.
• This optical design enhances the performance of AOTF-based imaging spectrometers.
• The study provides a viable solution for improving the optical quality of AOTF systems.