Cavity design with single-mirror THz frequency tuning for polariton lasers

Ondrej Kitzler*, Ameera Jose, Andrew Lee, David J. Spence, Helen M. Pask

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We demonstrate a new, to the best of our knlowledge, cavity design for terahertz (THz) lasers based on stimulated polariton scattering (SPS). The design simplifies the angle tuning of these lasers, which require non-collinear cavity fields at fundamental and Stokes wavelengths to cross in an SPS crystal with adjustable crossing angle. A mirror shared by both the fundamental and Stokes cavities ensures stationary overlap of the fields within the crystal, with the angle between the fields tunable by adjustment of one axis of a single mirror. We demonstrate the design for an intracavity SPS laser using a rubidium titanyle phosphate (RTP) crystal, and achieve single-mirror tuning of the THz output in bands between 3 and 5.8 THz, with a maximum output of 78 µW at 4.08 THz.

Original languageEnglish
Pages (from-to)3391-3394
Number of pages4
JournalOptics Letters
Issue number14
Publication statusPublished - 15 Jul 2022


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