1250C-848 Acousto-Optic Modulator
APPLICATION
· Wideband Modulator
· Frequency Shifter
FEATURES
· Very High Video Bandwidth
· Low Drive Power
· Improved Dynamic Contrast Ratio
· Good Temperature Stability
DRIVERS
525C-L (DIGITAL MODULATION)
620C-200(VARIABLE FREQUENCY & DIGITAL MOD’N)
535C-L (ANALOG MODULATION)
630C-200(VARIABLE FREQUENCY & ANALOG MOD’N)
OUTLINE DRAWING
SPECIFICATIONS
Spectral Range: .442-> 1.5mm* Standard A/R Wavelengths: 442-488nm, 532nm (Options to 1.5um available)
Interaction Medium: Tellurium Dioxide (Te02) Acoustic Velocity: 4.2mm/ms Active Aperture: 0.5mm Centre Frequency: 200MHz RF Bandwidth: 100MHz RF Input Impedance: 50W Nominal DC Contrast Ratio: >1000:1 min (2000:1 typical)
PERFORMANCE vs. WAVELENGTH
Operating Wavelength (nm)
442
488
532
RF Drive Power (W):
<0.6
<0.7
<0.9
Input Bragg Angle (mrad):
10.5
11.6
12.7
0th-1st Order Beam Separation (mrad):
21.1
23.2
25.3
Static Insertion Loss (%):
<5
<3
<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] 442-488nm, 532nm (Options to 1.5um available) [上升/下降时间] 7ns [活跃孔径] 0.5mm [操作频率] 50MHz [光学材料] TeO2