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An AO Frequency Shifter (AOFS) is a device that modifies the frequency of the optical beam. This is a consequence of the Doppler effect; the travelling acoustic wave causing the frequency of the optical beam to be either increased or decreased by an amount equal to the RF carrier frequency. Since the RF frequency is typically of the order of tens or hundreds of Megahertz, and the optical frequency is typically of the order of 1014Hz, the frequency shift is relatively small and would not normally be perceivable, for example as a visible change in colour.
Utilising a wide range of materials including Crystal Quartz, Fused Silica, Tellurium Dioxide, Lead Molybdate, Chalcogenide Glass, Gallium Phosphate, Silicon and Germanium allows us to offer devices operating in the wavelength range 244 to 15000nm and RF frequencies ranging from <20MHz to >1GHz. We also manufacture a range of RF drivers including; single frequency, tunable frequency (VCO or DFS) and dual frequency master / slave. Typical applications include Interferometry, vibrometry & atom cooling. |
Model | FS040-2C-AR1 | FS040-2E-AR1 | FS040-2E-ME1 | FS110-8M-DS3 |
Frequency Shift | 40MHz | 40MHz | 40MHz | 110MHz |
Frequency Drift / C | < ±10ppm | |||
Wavelength | 532nm | 630-690nm | 630-690nm | 1900-2100nm |
Interaction Material | Tellurium Dioxide | Tellurium Dioxide | Tellurium Dioxide | Chalcogenide Glass |
Acoustic Mode | Anisotropic, slow shear | Anisotropic, slow shear | Anisotropic, slow shear | |
AR Coating Reflectivity | < 0.2% per surface | < 03% per surface | < 0.2% per surface | ≤ 04% per surface |
Transmission | > 95% @ 532nm | > 95% @ 532nm | > 95% | ≥ 95% |
Clear Aperture | 4x2.0mm (horizontal and vertical) | 4x20mm | 4x2mm | |
Active Aperture | 15mm (vertical) | 15mm (vertical) | 1.5mm (vertical) | 20mm |
Polarisation (input) | Linear and horizontal with | Linear; horizontal with | Linear & horizontal in | Any |
Polarisation | Linear and orthogonal to input | Linear and orthogonal to input | Linear & orthogonal to input | |
0/1st Order Polarisation | >100:1 | >100:1 | >100:1 | |
Zero and 1st Order | Symmetrical to the left and | Symmetrical to the left | Symmetrical to the left and | |
Angle between | 2.4 @655nm | |||
Vertical Angle of Deflection | <2mrad with respect to | <2mrad with respect | <2mrad with respect to | |
Angle between Input | 90 ±1 | 90 ±1 | 901 | |
Maximum Diffraction Efficiency | >90% @532nm | >90% @635nm | >90% | |
Supply Voltage | +5Vdc (±10%) | +5Vdc (±10%) | 15VDC (±10%) | |
Power Consumption | <1.5W | <15W | <1.5W | <2W |
Power Supply Connection | Lead-through filter | Lead-through fi |
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