Quantum cascade lasers as broadband sources via strong RF modulation
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Date
2024-03
Publication Type
Journal Article
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yes
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Abstract
In this work, we demonstrate that in a regime of strong modulation, by generating pulses of the length of the order of a few cavity lifetimes (hundreds of ps), a broadband quantum cascade laser can be driven to lase on a bandwidth (250 cm⁻¹) limited by the gain. In addition, the amplitude noise of the radiation was shown to be limited by the detector. A laser linewidth study has been performed under different operating conditions, finding values spanning from 20 to 800 MHz, indicating a trade-off between emission bandwidth, amplitude stability, and coherence. The pulsed intensity of the output arises from the gain switching dynamics of the laser, while the self-seeded nature of the emission is responsible for the low amplitude noise and the relatively narrow linewidth of the individual spectral lines of the multimode emission.
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Publication status
published
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Journal / series
Volume
9 (3)
Pages / Article No.
36110
Publisher
American Institute of Physics
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Edition / version
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Geographic location
Date collected
Date created
Subject
Infrared radiation; Amplitude modulation; Fourier transform spectroscopy; Four wave mixing; Frequency combs; Lasers
Organisational unit
03759 - Faist, Jérôme / Faist, Jérôme
Notes
Funding
101070700 - MID-INFRARED QUANTUM TECHNOLOGY FOR SENSING (SBFI)