THz polariton laser using an intracavity Mg:LiNbO_3 crystal with protective Teflon coating
| Autor: | Andrew J. Lee, Helen M. Pask, Tiago A. Ortega, David J. Spence |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Total internal reflection
Materials science Terahertz radiation business.industry Energy conversion efficiency Lithium niobate 02 engineering and technology Laser 7. Clean energy 01 natural sciences Atomic and Molecular Physics and Optics law.invention 010309 optics Crystal chemistry.chemical_compound 020210 optoelectronics & photonics Optics chemistry law 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Polariton business Diode |
| Zdroj: | Optics Express. 25:3991 |
| ISSN: | 1094-4087 |
| DOI: | 10.1364/oe.25.003991 |
| Popis: | An enhancement in the performance of a THz polariton laser based on an intracavity magnesium-doped lithium niobate crystal (Mg:LiNbO3) in surface-emitted (SE) configuration is demonstrated resulting from the deposition of a protective Teflon coating on the total internal reflection surface of the crystal. In this cavity geometry the resonating fields undergo total internal reflection (TIR) inside the lithium niobate, and laser damage to that surface can be a limiting factor in performance. The protective layer prevents laser damage to the crystal surface, enabling higher pump power, yielding higher THz output power and wider frequency tuning range. With the unprotected crystal, narrow-band THz output tunable from 1.50 to 2.81 THz was produced, with maximum average output power of 20.1 µW at 1.76 THz for 4 W diode pump power (limited by laser damage to the crystal). With the Teflon coating, no laser damage to the crystal was observed, and the system produced narrow-band THz output tunable from 1.46 to 3.84 THz, with maximum average output power of 56.8 µW at 1.76 THz for 6.5 W diode pump power. This is the highest average output power and the highest diode-to-terahertz conversion efficiency ever reported for an intracavity terahertz polariton laser. |
| Databáze: | OpenAIRE |
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