High-resolution and gapless dual comb spectroscopy with current-tuned quantum cascade lasers

Abstract

We present gapless, high-resolution absorption and dispersion spectra obtained with quantum cascade laser frequency combs covering 55 cm${}^{-1}$. Using phase-sensitive dual comb design, the comb lines are gradually swept over 10 GHz, corresponding to the free spectral range of the laser devices, by applying a current modulation. We show that with interleaving the spectral point spacing is reduced by more than four orders of magnitude over the full spectral span of the frequency comb. The potential of this technique for high-precision gas sensing is illustrated by measuring the low pressure (107 hPa) absorption and dispersion spectra of methane spanning the range of 1170 cm${}^{-1}$ - 1225 cm${}^{-1}$ with a resolution of 0.001 cm${}^{-1}$.

References in corpus (16)

• Frequency comb spectroscopy
• Coherent, multi-heterodyne spectroscopy using stabilized optical frequency combs
• High Coherence Mid-Infrared Dual Comb Spectroscopy Spanning 2.6 to 5.2 microns
• Phase-stabilized, 1.5-W frequency comb at 2.8 to 4.8 micron
• Spectroscopy of the Methane ν3 Band with an Accurate Mid-Infrared Coherent Dual- Comb Spectrometer
• Mid-infrared dual-comb spectroscopy with electro-optic modulators
• Cavity Enhanced Optical Vernier Spectroscopy, Broad Band, High Resolution, High Sensitivity
• Observing the intrinsic linewidth of a quantum-cascade laser: beyond the Schawlow-Townes limit
• Mid-Infrared Optical Frequency Combs based on Difference Frequency Generation for Molecular Spectroscopy
• Continuous probe of cold complex molecules with infrared frequency comb spectroscopy
• Self-corrected chip-based dual-comb spectrometer
• Computational coherent averaging for free-running dual-comb spectroscopy
• Mid-infrared feed-forward dual-comb spectroscopy at 3 $\mu$m
• Optical frequency comb spectroscopy at 3-5.4 μm with a doubly resonant optical parametric oscillator
• On-chip mid-infrared and THz frequency combs for spectroscopy
• Fourier transform spectroscopy around 3 microns with a broad difference frequency comb

Cited by in corpus (16)

• Photo-acoustic dual-frequency comb spectroscopy
• A mid-infrared dual-comb spectrometer in step-sweep mode for high-resolution molecular spectroscopy
• Optical Frequency Comb Fourier Transform Spectroscopy of ${}^{14}$N${}_2$${}^{16}$O at 7.8 μm
• Mid-infrared quantum cascade laser frequency combs with a microstrip-like line waveguide geometry
• 1 GHz dual-comb spectrometer for fast and broadband measurements
• Dual-Comb Real-Time Molecular Fingerprint Imaging
• Tunable dual-comb spectrometer for mid-infrared trace gas analysis from 3 to 4.7 μm
• Synchronization of frequency combs by optical injection
• Cavity-Enhanced Vernier Spectroscopy with a Chip-Scale Mid-Infrared Frequency Comb
• Mid-infrared quantum cascade laser frequency combs based on multi-section waveguides
• Battery-operated mid-infrared diode laser frequency combs
• Sub-nominal resolution Fourier transform spectrometry with chip-based combs
• Coherence analysis of tightly locked mid-infrared quantum cascade laser frequency combs
• Quantum Cascade Lasers as Broadband Sources via Strong RF Modulation
• Quantum Walk Comb in a Dual Waveguide Quantum Cascade Laser
• A methane line list with sub-MHz accuracy in the 1250 to 1380 cm-1 range from optical frequency comb Fourier transform spectroscopy