PRINCIPLE OF OPERATION: Non-mechanical beam steering of a laser beam is achieved using an intra-cavity
fast spatial-time light modulator (STLM). The STLM consists of an electrooptic ceramic plate with vapor-deposited linear electrodes.
Mode of operation::
scanning of single pulses over random points on an array of 30x30 resolvable angles at a frequency up to 10 Hz;
generation of scanning pulses packets with a repetition frequency of 100 kHz in a packet;
generation of pulses with a repetition frequency of 10 Hz under continuous flash-lamp pumping
These are intended for modulation and scanning of optical radiation.
Area of application:
Under intracavity scanning of laser radiation:
laser location and laser viewing;
information transfer and processing at a rate of 1 Mbit/s;
exact and controlled delivery of radiation to a given point in space.
STML includes:
two PLZT- based modules with linear embedded electrodes;
transistor switches to control STLM;
software.
Technical characteristics
STLM material
PLZT (9/65/35)
Spectral range
0.5...5.5 µm
Number of controlled optical switches
32x32, 64x64, 128x128
Addressing
Matrix with free access
Size of optical switch
150õ150 µm
Electrode width
50 µm
Resistance of electrodes
40 Om
Control voltage
120 V (for l=0.63 µm)
Optical contrast
>1000
Electro-optical response time
1 µñ
Switching frequency
up to 105 Hz
Radiant resistance
11 J/cm2 (for tu=30 ns)
Side view
Front view
A PHOTODETECTOR ARRAY (PDA)
Is intended for recording of a pulse laser radiation with pulse duration of t=10...100 μs, for radiation processing.
In one mode of operation it displays a position number indicating which detector element has recorded the incoming light pulse.
Technical characteristics
Number of channels
64
Organization
square of 8 x 8 elements
Dimensions of lens raster
10õ10 mm
Focal distance of lens raster
59 mm
Plane viewing angle of a channel
9 mrad
Spectral working range without filters
800...1700 nm
Noise equivalent to energy for pulses of 1 ns to 10 μs
<6·10-16 J
Position accuracy of an object
0.5 element
Time for position computation
<20 μs
Data presentation
serial code
Supply voltage
12±2 V or 24±4 V
Power consumption
<10 W
Overall dimensions
180õ180õ300 mm
To minimize false alarms, the in-circuit and external
time selection are employed by the photodetector array.
