声光偏转器
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Introduction to A-O Deflectors/Scanners
一个声偏转器/扫描器可以改变一个激光束的方向角度,角度的位置呈线形的于声频成正比.因此频率越高,射频的角度越大。
声光偏转器的物理特点是它的光孔径大小，高（H）；宽（D）。通常，因为性能和设计的局限性，光的宽度要大于高度。因此，激光的输入和输出需要圆柱体的光学将偶然光从一个环形光转变成一个变短的长方形光，然后经过偏转器再返回到环形光。这个输出的光通常聚焦到发生片状的环形光上又在输出片上形成线形的焦点。
| Item | Units | TED-750-500-650 |
| Substrate | - | TeO2 |
| Wavelength of Operation | nm | 650 |
| Frequency Shift | MHz | 750 |
| Bandwidth (3 dB) | MHz | 500 |
| Access Time | us | 0.2 |
| Time Bandwidth Product | - | 100 |
| Active Aperture | mm | 0.05 x 1 |
| Optical Transmission | % | >80 |
| Diffraction Efficiency | % | 20-30 |
| Wave Front Distortion | - | l/10 |
| Bragg Angle | mrad | 57 |
| Separation Angle | mrad | 113 |
| Acoustic Velocity | m/s | 4.20E+03 |
| Maximum RF Power | W | 1 |
| Input Impedance | ohms | 50 |
| V.S.W.R | - | 2.1:1 |
| Optical Polarization * | - | Linear |
| RF Connector | - | SMA |
Item Units TED2-412.5-100-532 Substrate - TeO2 Wavelength of Operation nm 532 Center Frequency MHz 412.5 RF Bandwidth MHz 100 (Per Request) Rise Time ms 2 Time-Bandwidth Product 200 Active Aperture mm 0.5 x 9.0 Separation Angle mrad 52 @ 412.5 MHz Deflection Angle mrad 13 over 100 MHz Optical Transmission % >98 Diffraction Efficiency * % ~60 Extinction Ratio >1000:1 Wave Front Distortion l/10 Bragg Angle mrad 26 Acoustic Velocity m/s 4200 Maximum RF Power** W ~2 Input Impedance ohms 50 V.S.W.R % 0.084027778 Optical Polarization - Linear RF Connector - SMA
Item Units TED-320-200-633 Substrate - TeO2 Wavelength of Operation nm 633 Center Frequency MHz 320 Bandwidth (3 dB) MHz 200 Rise Time ms 2 Active Aperture mm 0.5 x 9.0 Separation Angle mrad 48 Deflection Angle mrad 30 Optical Transmission % >95 Diffraction Efficiency * % ~60 Extinction Ratio >1000:1 Wave Front Distortion l/10 Bragg Angle mrad 24 Acoustic Velocity m/s 4200 Maximum RF Power** W 2 Input Impedance ohms 50 V.S.W.R % 0.084027778 Optical Polarization - Linear RF Connector - SMA
Item Units TED20-100-50-532-AR Substrate - TeO2 Wavelength of Operation nm 532 Center Frequency MHz 100 RF Bandwidth MHz 50 Active Aperture mm 3 x 14 mm Access Time ms 20 Optical Transmission % >95 Time-Bandwidth Product* - 1000 Deflection Angle mrad ~40 Diffraction Efficiency (peak value) % ~70 Extinction Ratio >30 dB Wave Front Distortion l/10 Acoustic Velocity m/s 660 Maximum RF Power W ~1 Input Impedance ohms 50 V.S.W.R % 3.1:1 Optical Polarization - Linear RF Connector - SMA
Item Units TED3-90-40-1.3-AR Substrate - TeO2 Wavelength of Operation nm 1300 Center Frequency MHz 90 Bandwidth (3 dB) MHz 40 Optical Aperture mm 1 x 2 Access Time ms 3 Time-bandwidth Product - 120 Optical Transmission % >90 Diffraction Efficiency (total) % ~40 Deflection Angle mrad 88 (~5 deg) Maximum RF Watts 3 Acoustic Velocity m/s 680 Input Impedance ohms 50 V.S.W.R % <3.1:1 Optical Polarization - Linear RF Connector - SMA
