Triggering GaAs lock-on switches with laser diode arrays
- Sandia National Labs., Albuquerque, NM (USA)
- David Sarnoff Research Center, Princeton, NJ (USA)
Many of the applications that require the unique capabilities of Photoconductive Semiconductor Switches (PCSS) demand a compact package. We have been able to demonstrate that GaAs switches operated in the high gain mode called lock-on'' meet the required electrical switching parameters of several such applications using small switch sizes. The only light source that has enough power to trigger a PCSS and is compatible with a small package is a laser diode. This paper will describe the progress that leads to the triggering of high power PCSS switches with laser diodes. Our goal is to switch up to 5 kA in a single shot mode and up to 100 MW repetitively at up to 10 kHz. These goals are feasible since the switches can be used in parallel or in series. Low light level triggering became possible after the discovery of a high electric field, high gain switching mode in GaAs (and later in InP). At electric fields below 3 kV/cm GaAs switches are activated by creation of, at most, only one conduction electron- valence hole pair per photon absorbed in the sample. This linear mode demands high laser power and, after the light is extinguished, the carriers live for only a few nanoseconds. At higher electric fields GaAs behaves as a light activated Zener diode. The laser light generates carriers as in the linear mode and the field induces gain such that the amount of light required to trigger the switch is reduced by a factor of up to 500. The gain continues until the field across the sample drops to a material dependent lock-on field. At this point the switch will carry as much current as, and for as long as, the circuit can maintain the lock-on field. The gain in the switch allows for the use of laser diodes. 8 refs., 11 figs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- AC04-76DP00789; AC03-87SF17127
- OSTI ID:
- 6877599
- Report Number(s):
- SAND-90-0157C; CONF-9006176--9; ON: DE90013400
- Country of Publication:
- United States
- Language:
- English
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360603 -- Materials-- Properties
42 ENGINEERING
426000* -- Engineering-- Components
Electron Devices & Circuits-- (1990-)
ARSENIC COMPOUNDS
ARSENIDES
CHROMIUM COMPLEXES
COMPLEXES
DOPED MATERIALS
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
EQUIPMENT
FREQUENCY ANALYSIS
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
LASERS
LIGHT SOURCES
MATERIALS
MODE LOCKING
PERFORMANCE
PNICTIDES
POWER DENSITY
PULSE CIRCUITS
PULSE TECHNIQUES
RADIATION SOURCES
RECOMBINATION
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
SEMICONDUCTOR SWITCHES
SOLID STATE LASERS
SWITCHES
TRANSITION ELEMENT COMPLEXES
TRIGGER CIRCUITS
WAVE FORMS