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Cavity design with single-mirror THz frequency tuning for polariton lasers
Optics Letters
|July 15, 2022
Summary
We developed a novel cavity design for terahertz (THz) lasers using stimulated polariton scattering (SPS). This innovation simplifies angle tuning by employing a shared mirror for stationary field overlap, enabling adjustable THz output.
Area of Science:
- Optics and Photonics
- Quantum Electronics
- Terahertz Science and Technology
Background:
- Terahertz (THz) lasers based on stimulated polariton scattering (SPS) typically require complex angle tuning mechanisms.
- Achieving non-collinear cavity fields for fundamental and Stokes wavelengths necessitates precise alignment within an SPS crystal.
Purpose of the Study:
- To introduce a new cavity design for THz lasers that simplifies angle tuning.
- To enable efficient and tunable THz output through a novel mirror configuration.
Main Methods:
- A new cavity design featuring a shared mirror for fundamental and Stokes cavities was implemented.
- This design ensures stationary overlap of non-collinear fields within a rubidium titanyle phosphate (RTP) crystal.
- Single-mirror adjustment allows for tunable crossing angles between the fields.
Main Results:
- The demonstrated intracavity SPS laser design achieved single-mirror tuning of THz output.
- Tunable output was observed in the frequency bands between 3 and 5.8 THz.
- A maximum output power of 78 μW was recorded at 4.08 THz.
Conclusions:
- The novel cavity design significantly simplifies the angle tuning of THz lasers based on SPS.
- This approach offers a practical method for achieving tunable THz generation.
- The design holds promise for advancements in THz spectroscopy and imaging applications.
