Spatial-Dependent Spectral Response of Acousto-Optic Tunable Filters with Inhomogeneous Acoustic Distribution.

Area of Science:

• Optics and Photonics
• Acousto-Optics
• Spectral Imaging

Background:

• The spectral response of acousto-optic tunable filters (AOTFs) is critical for spectral imaging systems.
• Ideal models assume uniform acoustic fields, simplifying spectral response calculations.
• Non-uniform acoustic fields in real-world AOTFs cause spatial variations in spectral response.

Purpose of the Study:

• To develop an analytical model for calculating the spatial-dependent spectral response of AOTFs.
• To investigate the impact of non-uniform acoustic fields on AOTF spectral characteristics.
• To provide a computational model for calibrating AOTF-based spectral imaging systems.

Main Methods:

• Development of an analytical model to compute spatial-dependent spectral response.
• Simulation of acoustic field distribution and its effect on diffracted light amplitude.
• Experimental validation using AOTF frequency scanning experiments.

Main Results:

• The proposed model accurately calculates the spatial-dependent spectral response of AOTFs.
• Non-uniform acoustic field distribution leads to spatially varying spectral responses.
• The study quantifies the variation pattern of diffracted light amplitude due to acoustic inhomogeneity.

Conclusions:

• Acoustic field distribution significantly impacts the spatial-spectral response of AOTFs.
• The developed computational model offers crucial data for calibrating AOTF systems.
• This work enhances the precision and reliability of AOTF-based spectral imaging.