1250C-829A Acousto-Optic Modulator
APPLICATION
· Wideband Modulator
· Frequency Shifter
· Low Resolution Deflector
FEATURES
· Very High Video Bandwidth
· Low Drive Power
· Improved Beam Separation
· Good Temperature Stability
MODULATOR DRIVERS
526C (DIGITAL MODULATION) 536C (ANALOG MODULATION)
OUTLINE DRAWING
SPECIFICATIONS
Spectral Range: .442-> 1.5mm* Standard A/R Wavelengths: 360-420nm, 442-488nm Interaction Medium: Tellurium Dioxide (Te02) Acoustic Velocity: 4.2mm/ms Active Aperture: 0.45mm Centre Frequency: 260MHz (250MHz) RF Bandwidth: 100MHz RF Input Impedance: 50W Nominal DC Contrast Ratio: >1000:1 min (2000:1 typical)
PERFORMANCE vs. WAVELENGTH
Wavelength (nm)
375
405
442
488
RF Drive Power (W):
<0.45
<0.5
<0.55
<0.7
Diffraction efficiency(Beam dia’> 120um)
>85%
>85%
>85%
>85% Input Bragg Angle (mrad):
11.6
12.5
13.7
15.1
0th-1st Order Beam Separation (mrad):
23.2
25.1
27.4
30.2
Static Insertion Loss (%):
<7
<5
<5
<3
DYNAMIC CONTRAST RATIO
Maximum modulation bandwidth (50MHz) dynamic contrast ratio (CR) is obtained with a focussed beam diameter of 31mm. The typical MTF (depth of modulation) curve for the 1250C is shown at left. For larger beam diameters, the abscissa scales linearly. The value of M from the curve may be used to determine the sine wave contrast ratio at a particular modulating frequency according to the relation:
CR = 1+M/1-M
For digital, on-off modulation, the CR will be greater than the value calculated from the above equation.
商品属性 [波长] 360-420nm, 442-488nm [上升/下降时间] 9ns [活跃孔径] 0.45mm [操作频率] 40MHz [光学材料] TeO2