Terahertz quantum cascade ring lasers: comb operation and integration on Si-substrates

M. Jaidl; N. Opačak; M. A. Kainz; M. Ertl; D. Theiner; B. Limbacher; M. Beiser; M. Giparakis; M. A. Andrews; G. Strasser; B. Schwarz; J. Darmo; K. Unterrainer

doi:10.1117/12.2648329

17 March 2023 Terahertz quantum cascade ring lasers: comb operation and integration on Si-substrates

M. Jaidl, N. Opačak, M. A. Kainz, M. Ertl, D. Theiner, B. Limbacher, M. Beiser, M. Giparakis, M. A. Andrews, G. Strasser, B. Schwarz, J. Darmo, K. Unterrainer

Author Affiliations +

Proceedings Volume PC12440, Novel In-Plane Semiconductor Lasers XXII; PC124400Q (2023) https://doi.org/10.1117/12.2648329
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Ring resonators are interesting alternative cavity solutions to the commonly used ridge type waveguide for THz Quantum Cascade lasers. They either support a standing wave pattern showing spatial hole burning if there are defects implemented or a traveling mode in a defect-free cavity. We have fabricated two devices structures. The first one is episide-up with bonding pads. The measurements show a complex behavior of comb-formation most probably influenced by spatial hole burning. The second structure is a pure ring mounted episode down on Si-substrate. This structure shows a totally different comb formation as well as much reduced threshold currents.

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M. Jaidl, N. Opačak, M. A. Kainz, M. Ertl, D. Theiner, B. Limbacher, M. Beiser, M. Giparakis, M. A. Andrews, G. Strasser, B. Schwarz, J. Darmo, and K. Unterrainer "Terahertz quantum cascade ring lasers: comb operation and integration on Si-substrates", Proc. SPIE PC12440, Novel In-Plane Semiconductor Lasers XXII, PC124400Q (17 March 2023); https://doi.org/10.1117/12.2648329

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