Broad area lasers with folded-resonator geometry for integrated transverse mode selection

Dirk Hoffmann; Klaus Huthmacher; Christoph Doering; Henning Fouckhardt

doi:10.1117/12.873378

16 February 2011 Broad area lasers with folded-resonator geometry for integrated transverse mode selection

Dirk Hoffmann, Klaus Huthmacher, Christoph Doering, Henning Fouckhardt

Proceedings Volume 7953, Novel In-Plane Semiconductor Lasers X; 79531R (2011) https://doi.org/10.1117/12.873378
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

AlGaInAsSb-based broad area lasers (BALs) with a monolithically integrated Fourier-optical 4f set-up in a folded-resonator geometry are realized. The two resonator branches - each one d = 0.825 mm long - are connected through a dry-etched cylindrical total-internal-reflection (TIR) mirror acting as a Fourier-transform element. Transverse mode selection (TMS) is achieved by monolithically integrated spatial-frequency filters positioned in the back focal plane of the mirror (i.e. in the Fourier-transform plane). The whole resonator is gain section (active medium) as well as part of the TMS 4f set-up at the same time. The integration of TMS within the active BAL chip is shown to be successful. All employed BAL/TMS type-II heterostructure lasers are MBE-grown on GaSb substrates, designed for an emission wavelength in the mid-infrared around 2 μm. Different laser samples without any filter elements (no-TMS) and with filters for the selection of the fundamental transverse mode (#0; TMS0) are prepared and characterized. Just for a proof of principle also samples for the selection of higher order transverse modes, here exemplarily mode #6 (TMS6) and #8 (TMS8), have been processed and investigated. The free spectral range between the longitudinal modes is found to be around 0.33 nm corresponding to the BAL's total-resonator length 2d = 1.65 mm (with an effective refractive index n_eff ≈ 3.8). This result strongly emphasizes that both resonator branches act together as one entity.

Citation Download Citation

Dirk Hoffmann, Klaus Huthmacher, Christoph Doering, and Henning Fouckhardt "Broad area lasers with folded-resonator geometry for integrated transverse mode selection", Proc. SPIE 7953, Novel In-Plane Semiconductor Lasers X, 79531R (16 February 2011); https://doi.org/10.1117/12.873378

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KEYWORDS

Optical filters

Mirrors

Resonators

Spatial frequencies

Gallium antimonide

Near field

Semiconductor lasers

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