Fiber-Q® Fiber Coupled Modulators (FCAOM)Fiber-coupled acousto-optic modulators (FCAOM) offer an elegant and robust solution for amplitude modulation of fiber lasers, allowing direct control of the timing, intensity, and temporal shape of the laser output. Our Fiber-Q® modulators offer high extinction ratio, low insertion loss, and excellent stability in both polarization maintaining (PM) and non-PM formats at modulation frequencies up to 80 MHz for visible and infrared wavelengths. Built for reliability, the Fiber-Q® series of products features a rugged hermetic design in a compact, low-profile package, ideal for ease of integration into all-fiber and OEM systems, including medical laser systems.Each Fiber-Q® acousto-optic modulator requires an RF driver to generate the RF signal creating the acoustic wave within the embedded AO crystal. Modulation of the beam through the Fiber-Q will depend upon the frequency and intensity of the applied RF signal.
Fiber-coupled acousto-optic modulators (FCAOM) were initially developed by G&H to modulate the intensity of light contained in fibers without having to break the fiber to install a free-space acousto-optic modulator (AOM). Traditionally, modulation in fiber lasers was achieved using a master oscillator power amplifier (MOPA). The MOPA limited the pulse shapes that could be created, and required a separate semiconductor seed laser system. Direct integration of a fiber optic acousto-optic modulator is a far simpler approach, and allows the optical path to remain closed for better power handling and reliability, in addition to lower loss. A fiber-coupled acousto-optic modulator (FCAOM) can directly control the temporal characteristics of the active output from a fiber laser, offering a wider variety of pulse shapes. As a byproduct of the acousto-optic effect, light passing through the 1st order diffraction mode of a fiber-coupled modulator also experiences a frequency shift and beam deflection. This allows our Fiber-Q® products to be used for more than just modulation, resulting in applications outside the laser such as optical heterodyne interferometry. The recent addition of visible Fiber-Q® products will also enable more compact all-fiber instrument designs in biomedical applications such as microscopy and flow cytometry. Today, G&H offers a line of fiber optic acousto-optic modulators designed for low insertion loss, high extinction ratio, and excellent return loss. Typical optical performance for the Fiber-Q® series includes:
- Insertion loss: as low as 2 dB, depending on model
- Extinction ratio: 50 dB
- Return loss: 40 dB
- Polarization extinction ratio: 20 dB (for polarization-maintaining models)
APPLICATIONS OF FIBER-COUPLED ACOUSTO-OPTIC MODULATORSIndustrial lasers, sensing, scientific research, telecommunication , quantum technology
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