Acousto-Optic Microscope Detection for Spectral Imaging With Low Light Loss

The detection system is segmented into multiple independent photodetector elements (pixels) arranged in a photodetector array, where each element detects a specific spatial position. This segmentation enables the system to capture spectral information across multiple wavelengths simultaneously by assigning different photodetector elements to different spectral ranges, thereby achieving spectral content quantification without requiring a completely complex system architecture.

The patent transitions from single-point detection to multi-element array detection, adding a spatial dimension to the detection process. By arranging photodetector elements in a two-dimensional array, the system can simultaneously detect light at different positions and wavelengths, enabling spectral imaging capability while maintaining manageable device complexity through parallel detection architecture.

The patent extracts and utilizes only the first diffraction order generated by the acousto-optical modulator, deliberately discarding higher diffraction orders that would cause light loss. By configuring the optical system to accept only the first diffraction order, the system achieves sufficient spectral separation capability while minimizing energy loss to higher orders, thus resolving the contradiction between measurement precision and energy conservation.

The acousto-optical modulator is configured with specific operating parameters (acoustic frequency, acoustic power) to generate diffraction patterns where the first diffraction order contains the desired spectral information. By optimizing these parameters, the system maximizes the intensity and purity of the first diffraction order while minimizing the generation of higher diffraction orders, thereby reducing light loss while maintaining spectral separation capability.

The detection system segments the detection function across multiple photodetector elements, where each element can be optimized for specific polarization states or wavelength ranges. This segmentation allows the system to detect multiple polarization states simultaneously using independent photodetector elements, thereby improving the signal-to-noise ratio through parallel detection while keeping each individual element relatively simple.

The photodetector array is designed with universal elements that can detect multiple polarization states and wavelength ranges simultaneously. Each photodetector element in the array serves multiple functions: detecting light at its assigned spatial position, resolving polarization state, and identifying wavelength through the diffraction pattern. This multi-functionality improves the signal-to-noise ratio by capturing comprehensive spectral and polarization information without requiring separate dedicated detectors for each parameter.