Self-starting harmonic comb emission in THz quantum cascade lasers
| Autor: | Jérôme Faist, Alexey Belyanin, Mattias Beck, Giacomo Scalari, Andres Forrer, Yongrui Wang |
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| Rok vydání: | 2021 |
| Předmět: |
Physics and Astronomy (miscellaneous)
Terahertz radiation FOS: Physical sciences Physics::Optics 02 engineering and technology 01 natural sciences 7. Clean energy law.invention law 0103 physical sciences Quantum 010302 applied physics Physics business.industry 021001 nanoscience & nanotechnology Laser Mode-locking Cascade Optical cavity Harmonic Optoelectronics 0210 nano-technology business Physics - Optics Optics (physics.optics) Coherence (physics) |
| Zdroj: | Applied Physics Letters, 118 (13) |
| ISSN: | 1077-3118 0003-6951 |
| Popis: | Harmonic comb state has proven to be emerging in quantum cascade lasers and promoted by an interplay between parametric gain and spatial hole burning. We report here on robust, pure, self-starting harmonic mode locking in Copper-based double-metal THz quantum cascade lasers. Different harmonic orders can be excited in the same laser cavity depending on the pumping condition and stable harmonic combs spanning more than 600 GHz bandwidth at 80 K are reported. Such devices can be RF injected and the free running coherence is assessed by means of self-mixing technique performed at 50 GHz. A theoretical model based on Maxwell-Bloch equations including an asymmetry in the gain profile is used to interpret the data. Comment: Submitted to APL, 6 pages, 5 figures |
| Databáze: | OpenAIRE |
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