Cw electro-optical properties of (Al,Ga)As modified-strip buried-heterostructure lasers

Journal Article · Tue Apr 01 04:00:00 EST 1980 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.327903· OSTI ID:5371264

Hartman, R L; Logan, R A; Koszi, L A; Tsang, W T

This paper presents a detailed study of the cw propeties of a modified-strip buried-heterostructure (MSBH) laser. Included are studies of the electrical, electro-optical, and optical beam properties, together with spectral characteristics, and temperature dependence of thresholds. A variation of this type of laser, a passive-mirror modified-strip buried heterostructure is also described. The MSBH laser possesses many desirable properties including excellent linearity of the lasing emission consistent with a second-harmonic content more than 40 dB below the fundamental, constant proportionality between the light emitted from the two mirror facets, ''kink-free'' emission to the maximum cw power levels measured (35 mW/mirror facet), nearly round near-field intensity distribution with an ellipicity of 1.3 : 1, lasing emission in the lowest-order transverse mode, full angle half-power perpendicular to the junction plane of 27.3/sup 0/ (significantly smaller than any other practical cw DH laser structure), and narrow cw spectra (emission is typically in only a few longitudinal modes). MSBH lasers are nonastigmatic signal sources so that diffraction-limited spherical optics can be used. Pulsations are not observed if the active stripe is free of absorbing defects. cw operation of 10 mW/mirror facet was obtained at ambient temperatures to 90 /sup 0/C with a T/sub 0/ of 126 /sup 0/K. For 380-..mu..m-long lasers pulsed threshold currents of 78 mA dc, slope efficiencies of 63%, forward resistances of 2 ..cap omega.., and zero-biased capacitances of 15 pF have been measured. At the operating power of 3 mW/mirror facet, the optical power density at the mirror facet is low (< or =10/sup 4/ W/cm/sup 2/) which may have positive reliability implications. The passive-mirror form of the MSBH laser (PM-MSBH laser) have been measured with thresholds of 104 mA dc and slope efficiencies of 31%.

• Research Organization: Bell Laboratories, Murray Hill, New Jersey 07974
• OSTI ID: 5371264
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 51:4; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
ALUMINIUM COMPOUNDS
ARSENIC COMPOUNDS
ARSENIDES
CRYSTAL STRUCTURE
DATA
ELECTRICAL PROPERTIES
ELECTRO-OPTICAL EFFECTS
EMISSION
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
INFORMATION
LASERS
MIRRORS
OPTICAL PROPERTIES
OSCILLATION MODES
PHYSICAL PROPERTIES
PNICTIDES
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
SPECTRA
TEMPERATURE DEPENDENCE