Active solid-state devices (e.g. – transistors – solid-state diode – Thin active physical layer which is – Heterojunction
Patent
1992-06-10
1993-10-12
Mintel, William
Active solid-state devices (e.g., transistors, solid-state diode
Thin active physical layer which is
Heterojunction
257 97, 257 95, 257 99, 372 48, H01L 3300
Patent
active
052528391
ABSTRACT:
A non-lasing edge-emitting LED (30) suitable for precision reflectometry has an absorber region (52) which is reverse-biased via a contact (58) to absorb light by Stark absorption or Franz-Keldysch effect. During operation, the gain region (50) is forward biased via contact (56) to produce light emission including stimulated emission from an edge of the device, The absorber region is sized to a length L.sub..alpha. >(gL.sub.g -1/21n(1/R.sub.1 R.sub.2))/.alpha. where g and .alpha. are coefficients of gain and absorption and R.sub.1 and R.sub.2 are the front and back facet (60, 64) reflectivities, such that round-trip power loss through the cavity is at least 60 dB. The length L.sub..alpha. is sufficient to preclude regenerative oscillation of light in the cavity during light emission including stimulated emission. Antireflection measures further reduce end facet reflectivity, limiting signal contributions due to internal reflections to less that -85 dB below the primary output signal. Controlling cavity width reduces sidewall reflections and using step-biased segmented contacts reduces gain/absorber interface reflections.
REFERENCES:
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patent: 5014280 (1991-05-01), Sanada et al.
patent: 5126803 (1992-06-01), Hager et al.
Dykaar et al., "Large-Signal Picosecond Response of InGaAs/InP Quantum Well Lasers with an Intracavity Loss Modulator," Appl. Phys. Lett. 56(17), Apr. 23, 1990, pp. 1629-1631.
Berthold et al., "Voltage-Controlled Q Switching of InGaAs/InP Single Quantum Well Lasers," Appl. Phys. Lett. 55(19), Nov. 6, 1989, pp. 1940-1942.
Levi et al., "Multielectrode Quantum Well Laser for Digital Switching", Appl. Phys. Lett. 56(12), Mar. 19, 1990, pp. 1095-1097.
Hewlett--Packard Company
Mintel William
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