1250C Acousto-Optic Modulator
APPLICATION
· Wideband Modulator
· Frequency Shifter
FEATURES
· Very High Video Bandwidth
· Low Drive Power
· Compact
· 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, 488-633nm (Options to 1.5um available) Interaction Medium: Lead Molybdate (PbMo04) Acoustic Velocity: 3.63mm/ms Active Aperture: 0.75mm 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
515
633
RF Drive Power (W):
<0.7
<0.8
<0.9
<1.3
Input Bragg Angle (mrad):
12.1
13.4
14.2
17.4
0th-1st Order Beam Separation (mrad):
24.3
26.9
28.4
34.9
Static Insertion Loss (%):
<10
<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, 488-633nm (Options to 1.5um available) [上升/下降时间] 10ns [活跃孔径] 0.75mm [操作频率] 40MHz [光学材料] PbMo04