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

Abstract

We report a method for phase visualization in the images of transparent specimens using analog image processing in incoherent light. The experimental technique is based on adaptive bandpass spatial filtering with an amplitude mask matched with an acousto-optic tunable filter in a telecentric optical system. We demonstrate the processing of microscopic images of unstained and stained histological sections of human thyroid tumor with improved contrast.

Optical image processing using acousto-optic modulators as programmable volume holograms: a review [Invited]

“…Some recent publications involving anisotropic Bragg processing include the works in Refs. [21][22][23][24][25][26][27].…”

Research on the characteristics of Klein–Cook parameter and diffraction efficiency of acousto-optic interaction for low-frequency ultrasonic in the liquid

“…With the development of laser technology, the theory and the application of the acousto-optic effect have been promoted rapidly. By using the principle of acousto -optic interaction, various acousto-optic devices have been made, such as acousto-optic modulator, acousto-optic Q switch, tunable filter, acousto-optic deflector [4][5][6][7][8]. These devices can control the direction, intensity and frequency of laser beam quickly and effectively, and convert electrical signals into optical signals in real time.…”

Double-Frequency-Shift Acousto-Optic Modulator with Controllable Pulse Pair Frequency Difference

“…Since the discovery of light diffraction caused by ultrasound wave [1], researchers have made an in-depth exploration of acousto-optic interaction [2][3][4][5]. They used an acoustooptic effect to modulate the frequency, intensity and propagation direction of optical signal, and then design an acousto-optic tunable filter (AOTF) [6][7][8], acousto-optic deflector (AOD) [9][10][11], acousto-optic modulator (AOM) [12][13][14] and other optical devices, which are widely used in optical communication, laser control, spectrum detection and other fields [15][16][17]. Among them, an AOM uses diffraction to realize the frequency shift of the diffracted light relative to the incident light.…”