Product Overview

CASTECH's acousto-optic frequency shifters (AOFS) are compact devices designed to achieve frequency conversion of an input laser beam. As the beam passes through the device, the diffracted output beam is frequency shifted up or down — depending on the angle of incidence — by the frequency of the applied RF signal. Two or more devices can be cascaded to achieve sum or difference frequency combinations.

Key Features

• Standard frequency shifts from 20–300 MHz, many realizable in bicrystal devices
• Built with high acoustic- and optical-grade Tellurium Oxide (TeO2), grown and polished in-house at CASTECH
• Low insertion loss and high damage threshold
• Cascadable configurations for sum or difference frequency output
• Customizable center frequency and shifted frequency values
• Matched series of RF driver options available to pair with each device

Product Series

• Free-Space Frequency Shifters — Model: CATF-w-a-mt-f-c-h
• Fiber-Coupled Frequency Shifters — Model: CAFSF-f-r-mtq-xb-w-c-h

Highlight Specifications

• Standard operating wavelengths from 355 nm to 1550 nm
• Active apertures from 1 mm to 3 mm
• Center frequencies as low as 20 MHz and up to 110 MHz ± 15 MHz on select models

Full model-by-model specifications, wavelength/aperture/frequency combinations, and part-number definitions are available on the CASTECH website — visit www.castech.com for complete details.

Applications

• Interferometry
• Laser cooling
• Laser Doppler velocimetry
• Optical heterodyne detection

Manufacturing Capability

Founded in 1990, CASTECH INC. (Shenzhen Stock Exchange: 002222) has grown over 30+ years into a globally recognized supplier of crystals, optics, and laser components.

• 450,000+ sq ft (approx. 40,000 sqm) manufacturing facility
• 1,000+ employees dedicated to performance and cost-effective solutions
• Around 50% of products exported worldwide
• In-house crystal growth and polishing (including TeO2) for full control over material quality and device performance

Get in Touch

Contact CASTECH today to discuss custom center-frequency specifications and matched RF driver options for your application, or visit our website for the full technical datasheet.