NDLI: Electron beam scanlaser

Content Provider	IEEE Xplore Digital Library
Author	Myers, R.A. Pole, R.V.
Copyright Year	1966
Description	Author affiliation: IBM Watson Research Center, Yorktown Heights, N.Y. (Myers, R.A.)
Abstract	This paper reports en experimental studies of the Electron Beam Scanlaser, a scanning laser device in which the transverse position of focused laser light is controlled by means of a conventionally deflected electron beam. In the Scanlaser, the method of scanning is based on a transversely degenerate laser cavity in which the Q is spoiled for all transverse modes but one. The resonator we are using is the Flat Field Conjugate (FFC) Resonator, which is capable of supporting as many as $10^{7}nearly$ degenerate transverse modes, and mode selection is accomplished by means of a modified electro-optic display tube, in which an electron beam induces a localized birefringence in an electro-optic crystal. Using a25 \times 25 \times 3mm z-cut KDP (or deuterate.d KDP) crystal and a low resolution 10 SP-type electron gun with conventional magnetic deflection, we have observed a field of 120 × 120 fully resolved spots. The active medium is a pulsed mercury hollow cathode discharge, emitting at 6150 A; the laser power in a one-microsecond pulse is 15mw, 20db greater than the electron beam power. By operating the laser very close to threshold, it is possible to reduce the spot size of the light output with respect to the spot size of the electron beam: Similarly, at threshold, the duration of the lasing process is shorter than the time constant of the KDP, which is of the order of 30msec. In this manner, we have obtained spots as small as thirty microns in diameter, and decay times of a few millisec. Since the first operation of this device, attempts have been made to optimize both the hollow cathode discharge tube and the electro-optic mode selector, and these will be described. High speed motion pictures of the operation of the device have given considerable information on the dynamics of the charge build-up and decay, and of its influence on the laser operation.
Starting Page	130
Ending Page	130
File Size	110997
Page Count	1
File Format	PDF
DOI	10.1109/IEDM.1966.187756
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1966-10-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electron beams Laser modes Electron tubes Optical pulses Cathodes Optical control Lighting control Displays Birefringence Power lasers
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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