On-chip, self-detected THz dual-comb spectrometer

Abstract

We present a directly generated on-chip dual-comb source at THz frequencies. The multi-heterodyne beating signal of two free-running THz quantum cascade laser frequency combs is measured electrically using one of the combs as a detector, fully exploiting the unique characteristics of quantum cascade active regions. Up to 30 modes can be detected corresponding to a spectral bandwidth of 630 GHz, being the available bandwidth of the dual comb configuration. The multi-heterodyne signal is used to investigate the equidistance of the comb modes showing an accuracy of $10^{-12}$ at the carrier frequency of 2.5 THz.

References in corpus (4)

• Octave-spanning semiconductor laser
• On-chip Dual-comb based on Quantum Cascade Laser Frequency Combs
• Intrinsic linewidth of quantum cascade laser frequency combs
• High density THz frequency comb produced by coherent synchrotron radiation

Cited by in corpus (21)

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• Computational coherent averaging for free-running dual-comb spectroscopy
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• Towards Compact and Real-Time Terahertz Dual-Comb Spectroscopy Employing a Self-Detection Scheme
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• Self-starting Harmonic Comb Emission in THz Quantum Cascade Lasers
• Active Stabilization of Terahertz Semiconductor Dual-Comb Laser Sources Employing a Phase Locking Technique
• Regenerative Terahertz Quantum Detectors
• Frequency-modulated combs via on-chip field enhancement
• Intensity autocorrelation measurements of quantum cascade laser frequency combs in the Terahertz range
• Farey tree locking of terahertz semiconductor laser frequency combs
• Self-Referenced Terahertz Semiconductor Dual-Comb Sources
• Broadband surface-emitting THz laser frequency combs with inverse-designed integrated reflectors
• Broadband monolithic extractor for metal-metal waveguide based terahertz quantum cascade laser frequency combs
• Broadband Terahertz Quantum Cascade Laser Dual-Comb Sources with Off-Resonant Microwave Injection
• Coexisting frequency combs spaced by an octave in a monolithic quantum cascade laser
• RF Injection Locking of THz Metasurface Quantum-Cascade VECSEL
• Non-resonant Optical Injection Locking in Quantum Cascade Laser Frequency Combs