Gain recovery time in a terahertz quantum cascade laser
| Autor: | Reshma A. Mohandas, Joshua R. Freeman, Edmund H. Linfield, Paul Dean, Lianhe Li, David R. Bacon, A. Giles Davies |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Terahertz radiation business.industry Far-infrared laser Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology Laser 01 natural sciences Terahertz spectroscopy and technology law.invention Photomixing law Quantum dot laser 0103 physical sciences Optoelectronics 010306 general physics 0210 nano-technology business Quantum cascade laser Lasing threshold |
| ISSN: | 0003-6951 |
| Popis: | The gain recovery time of a bound-to-continuum terahertz frequency quantum cascade laser, operating at 1.98 THz, has been measured using broadband terahertz-pump-terahertz-probe spectroscopy. The recovery time is found to reduce as a function of current density, attaining a value of 18 ps as the laser is brought close to threshold. We attribute this reduction to improved coupling efficiency between the injector state and the upper lasing level as the active region aligns. |
| Databáze: | OpenAIRE |
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