Acousto Optic

AO Device from 180nm to 11µm

acousto optic Modulator
acousto optic Frequency Shifter
acousto optic Deflector
acousto optic Pulse Picker
acousto optic Tunable Filter AOTF
acousto optic Polychromatic Modulator
acousto optic Q-Switch
acousto optic Fiber Pigtailed

The applications:

Laser Printing
Laser Projection System
Laser Drilling/ Cutting
Optical Tweezer
Confocal Microscopy
Polarimetric Hyperspectral Imagery
Laser Doppler Velocimeter


The acoustic wave of an acousto-optic modulator is amplitude modulated. The operation of an acousto-optic modulator is based on the dependence of the acousto-optic diffraction efficiency on the intensity of the acoustic wave.

The acoustic intensity can be controlled by an electrical signal that generates the acoustic wave in a modulator. An acousto-optic modulator is an electronically addressed amplitude modulator that accepts an electrical modulation signal to vary the intensity of an optical beam accordingly.

Acousto-optic modulators have been put to many different applications. The straightforward application is amplitude modulation of an optical beam, thus encoding a modulation signal on an optical carrier or providing loss modulation to an optical system such as a Q-switched or mode-locked laser. Sophisticated applications include time-domain convolution and correlation of wide-band RF signals in signal processing systems.

Superconducting acousto-optic phase modulator

We report the development of a superconducting acousto-optic phase modulator fabricated on a lithium niobate substrate. A titanium-diffused optical waveguide is placed in a surface acoustic wave resonator, where the electrodes for mirrors and an interdigitated transducer are made of a superconducting niobium titanium nitride thin film. The device performance is evaluated as a substitute for the current electro-optic modulators, with the same fiber coupling scheme and comparable device size. Operating the device at a cryogenic temperature (T = 8 K), we observe the length–half-wave-voltage (length–Vπ) product of 1.78 V·cm. Numerical simulation is conducted to reproduce and extrapolate the performance of the device. An optical cavity with mirror coating on the input/output facets of the optical waveguide is tested for further enhancement of the modulation efficiency. A simple extension of the current device is estimated to achieve an efficient modulation with Vπ = 0.27 V.

Acousto-optic modulation of a wavelength-scale waveguide

Since the advent of the laser, acousto-optic modulators have been an important tool for controlling light. Recent advances in on-chip lithium niobate waveguide technology present new opportunities for these devices. We demonstrate a collinear acousto-optic modulator in a suspended film of lithium niobate employing a high-confinement, wavelength-scale waveguide. By strongly confining the optical and mechanical waves, this modulator improves a figure-of-merit that accounts for both acousto-optic and electro-mechanical efficiency by orders of magnitude. Our device demonstration marks a significant technological advance in acousto-optics that promises a novel class of compact and low-power frequency shifters, tunable filters, non-magnetic isolators, and beam deflectors.