Improvement of the lateral-mode discrimination of broad-area diode lasers with a profiled reflectivity output facet

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Applied Optics

DOI:https://doi.org/10.1364/AO.35.005955· OSTI ID:399752

Stryckman, D; Rousseau, G; DAuteuil, M; McCarthy, N ^[1]

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1. Equipe Laser et Optique Guidee, Centre d`Optique, Photonique et Laser Departement de physique, Universite Laval, Quebec G1K 7P4 (Canada)

The emission of a broad-area laser always contains several lateral modes (along the junction plane) even at low drive levels. To increase the discrimination against high-order lateral modes, we developed simple techniques for depositing a profiled thin layer of SiO on the output facet of a broad-area laser that has a 75-{mu}m-wide injection current stripe. The profiled coating provided a nearly Gaussian reflectivity in the lateral direction (parallel to the junction plane). The resolved near-field spectra of the uncoated and coated lasers have been compared. The maximum output power in the single-lateral-mode regime was pushed to 25 mW with the profiled coating, compared with a corresponding power of less than 1 mW before deposition. Experimental results have confirmed the behavior predicted by our numerical simulations. This method is scalable to higher-power lasers. {copyright} {ital 1996 Optical Society of America.}

• Sponsoring Organization: USDOE
• OSTI ID: 399752
• Journal Information: Applied Optics, Journal Name: Applied Optics Journal Issue: 30 Vol. 35; ISSN 0003-6935; ISSN APOPAI
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
ABSORPTIVITY
DESIGN
GAIN
MILLIWATT POWER RANGE
OPTICS
REFLECTIVE COATINGS
REFRACTIVE INDEX
SOLID STATE LASERS