Introduction to A-O Deflectors/Scanners
一個(gè)聲偏轉(zhuǎn)器/掃描器可以改變一個(gè)激光束的方向角度,角度的位置呈線形的于聲頻成正比.因此頻率越高,射頻的角度越大。
聲光偏轉(zhuǎn)器的物理特點(diǎn)是它的光孔徑大小，高（H）；寬（D）。通常，因?yàn)樾阅芎驮O(shè)計(jì)的局限性，光的寬度要大于高度。因此，激光的輸入和輸出需要圓柱體的光學(xué)將偶然光從一個(gè)環(huán)形光轉(zhuǎn)變成一個(gè)變短的長(zhǎng)方形光，然后經(jīng)過(guò)偏轉(zhuǎn)器再返回到環(huán)形光。這個(gè)輸出的光通常聚焦到發(fā)生片狀的環(huán)形光上又在輸出片上形成線形的焦點(diǎn)。
| 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
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