Merged beam laser design for reduction of gain-saturation and two-photon absorption in high power single mode semiconductor lasers | Zendy

Mykhaylo Lysevych | Zendy; Hark Hoe Tan | Zendy; F. Karouta | Zendy; Lan Fu | Zendy; C. Jagadish | Zendy

Open Access

Merged beam laser design for reduction of gain-saturation and two-photon absorption in high power single mode semiconductor lasers

Author(s) -

Mykhaylo Lysevych,

Hark Hoe Tan,

F. Karouta,

Lan Fu,

C. Jagadish

Publication year - 2013

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.21.008276

Subject(s) - laser , optics , materials science , semiconductor laser theory , optoelectronics , injection seeder , semiconductor optical gain , optical amplifier , waveguide , single mode optical fiber , amplifier , semiconductor , physics , cmos

In this paper we report a method to overcome the limitations of gain-saturation and two-photon absorption faced by developers of high power single mode InP-based lasers and semiconductor optical amplifiers (SOA) including those based on wide-waveguide or slab-coupled optical waveguide laser (SCOWL) technology. The method is based on Y-coupling design of the laser cavity. The reduction in gain-saturation and two-photon absorption in the merged beam laser structures (MBL) are obtained by reducing the intensity of electromagnetic field in the laser cavity. Standard ridge-waveguide lasers and MBLs were fabricated, tested and compared. Despite a slightly higher threshold current, the reduced gain-saturation in MBLs results in higher output power. The MBLs also produced a single spatial mode, as well as a strongly dominating single spectral mode which is the inherent feature of MBL-type cavity.

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