Inp-Based Quantum Cascade Lasers Monolithically Integrated Onto Silicon

Abstract

Lasing is reported for ridge-waveguide devices processed from a 40-stage InP-based quantum cascade laser structure grown on a 6-inch silicon substrate with a metamorphic buffer. The structure used in the proof-of-concept experiment had a typical design, including an Al0.78In0.22As/In0.73Ga0.27As strain-balanced composition, with high strain both in quantum wells and barriers relative to InP, and an all-InP waveguide with a total thickness of 8 µm. Devices of size 3 mm x 40 µm, with a high-reflection back facet coating, emitted at 4.35 µm and had a threshold current of approximately 2.2 A at 78 K. Lasing was observed up to 170 K. Compared to earlier demonstrated InP-based quantum cascade lasers monolithically integrated onto GaAs, the same laser structure integrated on silicon had a lower yield and reliability. Surface morphology analysis suggests that both can be significantly improved by reducing strain for the active region layers relative to InP bulk waveguide layers surrounding the laser core.

Publication Date

8-20-2018

Publication Title

Optics Express

Volume

26

Issue

17

Number of Pages

22389-22393

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/OE.26.022389

Socpus ID

85051762847 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85051762847

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