Experimental Investigation into a Method of Detecting SHF Modulated Laser Radiation by a Photocell

A device is described in which a SHF-modulated laser beam is modulated using a lithium niobate crystal and demodulated by use of a photoelectric multiplier photocathode. The modulator and demodulator are located in the same coaxial cavity resonator, in externally applied electrical and magnetic fiel...

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Bibliographic Details
Main Authors: Movsesyan,R. A, Papyan,V. A, Gyunashyan,K. B
Format: Report
Language:English
Subjects:
AERIAL PHOTOGRAPHY
CAVITY RESONATORS
LASER MODULATORS
Lasers and Masers
LITHIUM COMPOUNDS
Lithium niobates
NIOBATES
Optical Detection and Detectors
Optical modulators
PHOTOCATHODES
PHOTODETECTORS
RANGE FINDING
TRANSLATIONS
USSR
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Summary:A device is described in which a SHF-modulated laser beam is modulated using a lithium niobate crystal and demodulated by use of a photoelectric multiplier photocathode. The modulator and demodulator are located in the same coaxial cavity resonator, in externally applied electrical and magnetic fields; the light beam passing through the modulator is reflected from a reflector mounted on a micrometer scale and a mirror to the photocathode. The phase difference between the signal received and the reference signal (the electrical field) is measured with a high degree of accuracy at the light flux minima registered on an oscillograph. Advantages and disadvantages of this method, compared with those of demodulation in a device identical to the modulator are discussed. Unedited trans. of Geodeziya i Kartografiya (USSR) n2 p39-43 Feb 73.