Voltage tuning of gain spectra in quantum cascade lasers

Yu Yao; Kale J. Franz; Zhijun Liu; Anthony J. Hoffman; Claire F. Gmachl

doi:10.1117/12.808295

3 February 2009 Voltage tuning of gain spectra in quantum cascade lasers

Yu Yao, Kale J. Franz, Zhijun Liu, Anthony J. Hoffman, Claire F. Gmachl

Author Affiliations +

Proceedings Volume 7230, Novel In-Plane Semiconductor Lasers VIII; 723012 (2009) https://doi.org/10.1117/12.808295
Event: SPIE OPTO: Integrated Optoelectronic Devices, 2009, San Jose, California, United States

Abstract

The voltage tuning of gain spectra in three types of Quantum Cascade laser designs is investigated. The gain spectra of the luminescence device are tunable over the whole voltage operation range for all designs. The lasers are as tunable as the electroluminescence below threshold, while a reduced tunability is observed in all lasers above threshold. This is attributed to the decrease of resistance across the laser active region as the photon density increases. A resumed tunability high above threshold occurs in all lasers based on the anti-crossed designs. Lasers based on the anti-crossed diagonal transition are tunable above threshold, with a tuning range of about 40 cm^-1 (~4% of the laser emission wavenumber) at room temperature, i.e. a tuning rate of 800 cm-1 per volt per period of active region and injector.

Citation Download Citation

Yu Yao, Kale J. Franz, Zhijun Liu, Anthony J. Hoffman, and Claire F. Gmachl "Voltage tuning of gain spectra in quantum cascade lasers", Proc. SPIE 7230, Novel In-Plane Semiconductor Lasers VIII, 723012 (3 February 2009); https://doi.org/10.1117/12.808295

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