Study of intensity pulsations in proton-bombarded stripe-geometry double-heterostructure Al/sub x/Ga/sub 1-x/As lasers

Journal Article · Sun Jul 01 04:00:00 EDT 1979 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.326572· OSTI ID:6258674

van der Ziel, J P; Merz, J L; Paoli, T L

The pulsations in the laser emission from several lasers have been studied as a function of temperature, cavity length, external mirror illumination, and effect of mirror etching. Selected DH lasers with 12-..mu..m-wide stripes delineated by proton bombardment and 380-..mu..m-long cavities were used. The dependence on cavity length was studied using a series of 380-..mu..m-long unbonded chips which showed strong pulsations under pulsed operation and were then cleaved into approx.125-..mu..m-long sections. Of the short devices which lased, both center and end segments showed pulsations, indicating that unpumped end regions are not acting as saturable absorbers, resulting in the pulsations. The effects of illuminating the mirrors with 4880- and 6328-A laser radiation and injecting 1.06-..mu..m radiation into the active region were studied. The possibility that an oxide layer over the facet is associated with the pulsations was studied by stripping the oxide with a dilute NH/sub 4/OH solution. Most lasers had kinks in the L-I characteristic. The pulsations were quenched if the lasers were operated in a region near the kink. The models used previously to describe the pulsations do not appear to apply to the lasers studied here. Much of the pulsation behavior can be explained by a simple nonlinear-gain model in the electron-photon density equations of the laser. Such a nonlinear gain can result from spatial nonlinearities in the gain within the stripe.

• Research Organization: Bell Laboratories, Murray Hill, New Jersey 07974
• OSTI ID: 6258674
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 50:7; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
ALUMINIUM COMPOUNDS
ARSENIC COMPOUNDS
CAVITY RESONATORS
DIMENSIONS
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
FREQUENCY DEPENDENCE
GALLIUM COMPOUNDS
GEOMETRY
LASER CAVITIES
LASER RADIATION
LASERS
LENGTH
MATHEMATICS
MEDIUM TEMPERATURE
POWER
PULSATIONS
RADIATIONS
RESONATORS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
TEMPERATURE DEPENDENCE