1250C-974(M)OEM Acousto-Optic Modulator
APPLICATION
· Wideband Modulator
· Frequency Shifter
· Optimised for visible wavelengths
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:
488-633nm
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)
532
RF Drive Power (W):
<0.9 Input Bragg Angle (mrad):
12.7
0th-1st Order Beam Separation (mrad):
25.3
Static Insertion Loss (%):
<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] 488-633nm [上升/下降时间] 7ns [活跃孔径] 0.4mm [操作频率] 50MHz [光学材料] TeO2