Fabrication and Evaluation of Deep Surface Grating DFB Stripe Lasers Using Quantum Well Material

Abe, Hiroaki (1994) Fabrication and Evaluation of Deep Surface Grating DFB Stripe Lasers Using Quantum Well Material. MSc(R) thesis, University of Glasgow.

Abstract

This thesis describes experiments performed to fabricate and evaluate deep surface grating distributed feedback (DFB) lasers using double quantum well material. The distributed feedback structure was created by deep, dry etched, gratings alongside the ridge in the top confining layer of the laser. The material system used consisted of two 0.01 mum GaAs quantum wells and 0.01 mum Al0.2Ga0.8As barriers. The typical emission wavelength of the lasers was about 860 nm. Conditions were optimised to produce a third order 1:1 mark-space ratio grating using holographic exposure, shadow evaporation and reactive ion etching. The typical threshold current of the 2.5 mum stripe DFB lasers was 20% lower compared with the laser fabricated without etching of the GaAs contact layer in pulsed operation and was 37 mA in CW operation. The typical external differential quantum efficiency per facet was 15% in CW operation. The temperature range for single transvere DFB mode operation was found to be from 10 to 75

• Item Type: Thesis (MSc(R))
• Qualification Level: Masters
• Additional Information: Adviser: Richard Da La Rue
• Keywords: Electrical engineering, Optics
• Date of Award: 1994
• Depositing User: Enlighten Team
• Unique ID: glathesis:1994-75510
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 19 Nov 2019 19:36
• Last Modified: 19 Nov 2019 19:36
• URI: https://theses.gla.ac.uk/id/eprint/75510