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声光移频器
声光移频器

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声光移频器

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Acousto-Optic Frequency-Shifter 声光移频器
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
Frequency Shift
40MHz
40MHz
40MHz
110MHz
Frequency Drift / ºC
 
 
< ±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
< 0·3% per surface
< 0.2% per surface
≤ 0·4% per surface
Transmission
> 95% @ 532nm
> 95% @ 532nm
> 95%
≥ 95%
Clear Aperture
4x2.0mm (horizontal and vertical)
4x2·0mm (horizontal and vertical)
4x2mm (horizontal and vertical)
 
Active Aperture
1·5mm (vertical)
1·5mm (vertical)
1.5mm (vertical)
2·0mm
Polarisation (input)
Linear and horizontal with respect housing
Linear; horizontal with respect housing
Linear & horizontal in respect to housing
Any
Polarisation (output 1st order)
Linear and orthogonal to input
Linear and orthogonal to input
Linear & orthogonal to input
 
0/1st Order Polarisation Extinction Ratio
>100:1
>100:1
>100:1
 
Zero and 1st Order Beam Symmetry
Symmetrical to the left and right of the straight through direction ±0·5º
Symmetrical to the left and right of the straight through direction ±0·5º
Symmetrical to the left and right of the straight through direction ±0.5º
 
Angle between 0/1st Order Beams
 
 
2.4º @655nm
 
Vertical Angle of Deflection
<2mrad with respect to straight through
<2mrad with respect to straight through
<2mrad with respect to straight through
 
Angle between Input Beam and Housing
90º ±1º
90º ±1º
90º ± 1º
 
Maximum Diffraction Efficiency
>90% @532nm
>90% @635nm
>90%
 
Supply Voltage
+5Vdc (±10%)
+5Vdc (±10%)
15VDC (±10%)
 
Power Consumption
<1.5W
<1·5W
<1.5W
<2W
Power Supply Connection
Lead-through filter
Lead-through filter
 
 
RF Input Connector
SMB bulkhead jack
SMB bulkhead jack
 
SMA Female
RF Input
40MHz sine-wave voltage of 0.5 to 1V p-p
40MHz sine-wave; 0·5 to 1V p-p
 
 
RF Input Impedance
 
 
 
50Ω
Reference RF Output
 
 
10MHz sine-wave voltage of 0.5 to 1V peak to peak as a reference signal (drive frequency ÷ 4)
 
Diffraction Efficiency
 
 
 
≥85%
Harmonic Distortion
 
 
< 40dB @ 40MHz
 
Dimension and drawing
FS040-2C-AR1
FS040-2E-AR1
 
AOFS for Fibre Sensors M040-8J-F2S
 
l  Polarisation insensitive
l  Choice of wavelengths, 1450 to 1650nm
l  Choice of operating frequencies, 35 to 45MHz
 
A compact fibre-coupled acousto-optic frequency shifter ideal for use in interferometric fibre sensor systems such as Mach-Zehnder and laser Doppler configurations.
 
Available in frequencies from 35 to 45MHz and either up-shift or down-shift. This device operates over a broad wavelength range making it the first choice frequency shifter for distributed  sensor networks.
 
 
Specification
Interaction Material
Chalcogenide Glass
Wavelength
1520 to 1610nm
Polarisation Dependant Loss
None
Polarisation Mode Dispersion
None
Insertion Loss
<3.0dB
Extinction Ratio (1st order on/off)
>50dB
Rise-Time / Fall-Time
110ns
Frequency
40MHz
VSWR
<1.2:1 (50Ω input impedance)
RF Power
0.2W typical
Frequency Shift
-40MHz, down shift
Fibre Type
Single mode, 2m
Fibre Connectors
FC/PC, Seiko-Geiken
 
Options
Frequency: 35 to 45MHz
Frequency Shift: Up shift
Wavelength Range: Centred on 1500 to 1580nm
Fibre Type: Polarisation maintaining, multimode
Fibre Connectors: Pig-tails for splicing, FC/APC
 
Driver Selection
Digital Modulation: A118, N21040-0.4DM
Analogue Modulation: A025, N21040-0.4AM
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广州市盛雄激光设备有限公司 版权所有  备ICP:粤ICP备08017276号
总机：（86）020-31573062  传真：（86）020-62691015
售后专线：13312832727 网址：http://www.gz-laser.com E-mail:gz_laser@126.com
公司地址：广州市三元里大道447号瑶华大厦706-708室(三元里地铁站C2出口前三百米)