1.34 μm VECSEL mode-locked with a GaSb-based SESAM
Research output: Contribution to journal › Article › Scientific › peer-review
Details
Original language | English |
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Pages (from-to) | 3353-3356 |
Number of pages | 4 |
Journal | Optics Letters |
Volume | 43 |
Issue number | 14 |
DOIs | |
Publication status | Published - 15 Jul 2018 |
Publication type | A1 Journal article-refereed |
Abstract
Mode locking of a 1.34 μm vertical external cavity surface emitting laser is demonstrated using a GaSb-based semiconductor saturable absorber mirror (SESAM). The SESAM includes six AlGaSb quantum wells (QWs) with an absorption edge at ∼1.37 μm. The proposed approach has two key benefits: the QWs can be grown lattice matched, and only a small number of Bragg reflector layers is required to provide high reflectivity. Pump–probe measurements also reveal that the AlGaSb/GaSb structure exhibits an intrinsically fast absorption recovery on a picosecond timescale. The mode-locked laser pulse train had a fundamental repetition rate of 1.03 GHz, a pulse duration of ∼5 ps, and a peak power of ∼1.67 W. The demonstration paves the way for exploiting GaSb-based SESAMs for mode locking in the 1.3–2 μm wavelength range, which is not sufficiently addressed by GaAs and InP material systems.