Electro-optically sampled broadband dual-comb spectroscopy across mid-IR to terahertz (6.6–200 µm) spectral range DOI
Dmitrii Konnov,

Andrey Muraviev,

Sergey Vasilyev

et al.

Published: March 12, 2024

Ultrabroadband Electro-Optic Sampling (EOS) with few-cycle optical pulses is known to be an exceptionally sensitive technique detect electric field amplitudes. By combining this method dual-comb spectroscopy and a new class of ultrafast lasers, we perform high-resolution (10-80 MHz, 0.0003-0.0027 cm-1) spectroscopic measurements across the whole frequency range 1.5 45 THz (6.6–200 μm), excluding strongly absorbing Reststrahlen band lattice resonances at 4.5–9 THz, instantaneous spectral coverage exceeding octave (e.g., 9–22 μm). As pump source, use pair mutually coherent low-noise combs centered 2.35 μm produced by mode-locked solid-state Cr:ZnS lasers. To produce molecular 'sensing' comb in long-wave infrared region, one two driving down-converted via Intrapulse Difference Frequency Generation (IDFG) ZGP or GaSe nonlinear crystals. The second doubled crystal near-IR for EOS. A low intensity phase noise our system allows capturing vast amount comb-mode resolved (mode spacing 80 MHz) information (⪆200,000 lines) up video rate 69 Hz. This result was also facilitated high IDFG conversion efficiency ⪆10% crystal). Our long-wavelength IR low-pressure gases: ethanol, isoprene, dimethyl sulfide reveal features that had never been explored before.

Language: Английский

High-resolution frequency-comb spectroscopy with electro-optic sampling and instantaneous octave-wide coverage across mid-IR to THz at a video rate DOI Creative Commons
Dmitrii Konnov,

Andrey Muraviev,

Sergey Vasilyev

et al.

APL Photonics, Journal Year: 2023, Volume and Issue: 8(11)

Published: Nov. 1, 2023

Ultrabroadband electro-optic sampling using few-optical-cycle probing pulses is a sensitive technique to detect electric field amplitudes with high dynamic range and up near-infrared optical frequencies. By combining this method dual-frequency-comb spectroscopy new class of ultrafast lasers, we perform high-resolution, 80 MHz/0.0027 cm−1 (10 MHz/0.0003 spectral interleaving), spectroscopic measurements in the frequency 1.5–45 THz (6.6–200 µm), excluding strongly absorbing Reststrahlen band lattice resonances at 4.5–9 THz, an instantaneous coverage exceeding octave (e.g., 9–22 μm). As driving source, use pair mutually coherent combs from Kerr-lens mode-locked solid-state Cr:ZnS (2.35 μm) lasers. One downconverted via intrapulse difference generation produce longwave “sensing” comb, while second comb doubled near-IR “probe” for (EOS). The low intensity phase noise our dual-comb system allow capturing large amount information (200 000 comb-mode-resolved lines spaced by MHz) mid-IR portion spectrum video rate 69 Hz, signal-to-noise ratio limited shot EOS balanced detection system. Our low-pressure gaseous ethanol, isoprene, dimethyl sulfide reveal Doppler-limited signatures that have never been explored before.

Language: Английский

Citations

17
Ultra-CEP-stable single-cycle pulses at 2.2 µm DOI Creative Commons
Maciej Kowalczyk,

Nathalie Nagl,

Philipp Steinleitner

et al.

Optica, Journal Year: 2023, Volume and Issue: 10(6), P. 801 - 801

Published: May 12, 2023

Single-cycle optical pulses with controllable carrier-envelope phase (CEP) form the basis to manipulate nonlinear polarization of matter on a sub-femtosecond time scale. Moreover, light–matter energy exchange and frequency conversion processes benefit from longer, infrared wavelengths. We report highly stable source 6.9-fs, single-cycle at 2.2 µm, based directly diode-pumped Cr:ZnS oscillator 22.9-MHz repetition rate. Extreme spectral broadening output super-octave bandwidth (1.1–3.1 µm) is achieved in single rutile (TiO 2 ) plate. Excellent agreement simulations provides precise understanding underlying pulse propagation. A comprehensive investigation alternative materials additional out exceptional TiO due favorable interplay self-focusing, plasma formation accompanied by self-phase modulation self-compression. Unprecedented reproducibility waveforms ensured unique combination active CEP stabilization residual jitter only 5.9 mrad (0.1 Hz 11.45 MHz) relative intensity noise 0.036% 1 MHz). The new permits efficient downconversion mid-infrared cascaded intra-pulse difference generation, giving access manipulation electric currents low-bandgap an unprecedented degree control.

Language: Английский

Citations

15
Long-Term Stable, Multi-Watt direct femtosecond amplification based on Cr:ZnS DOI
Yanlei Hu, Xiaoming Lu, Rongjie Xu

et al.

Optics & Laser Technology, Journal Year: 2025, Volume and Issue: 188, P. 112924 - 112924

Published: April 10, 2025

Language: Английский

Citations

0
Atmospheric dispersion management in mid-IR mode-locked oscillators DOI Creative Commons
Evgeni Sorokin,

Alexander Rudenkov,

Nikolai Tolstik

et al.

Optics Express, Journal Year: 2023, Volume and Issue: 31(12), P. 18790 - 18790

Published: May 1, 2023

The atmospheric dispersion in the mid-infrared transparency windows presents an important albeit often neglected factor when developing ultrashort-pulsed lasers. We show that it can amount to hundreds of fs2 2-3 µm window with typical laser round-trip path lengths. Using Cr:ZnS as a test-bed, we demonstrate influence on femtosecond and chirped-pulse oscillator performance humidity fluctuations be compensated by active control, greatly improving stability mid-IR few-optical cycle sources. approach readily extended any ultrafast source windows.

Language: Английский

Citations

4
Electro-optically sampled broadband dual-comb spectroscopy across mid-IR to terahertz (6.6–200 µm) spectral range DOI
Dmitrii Konnov,

Andrey Muraviev,

Sergey Vasilyev

et al.

Published: March 12, 2024

Ultrabroadband Electro-Optic Sampling (EOS) with few-cycle optical pulses is known to be an exceptionally sensitive technique detect electric field amplitudes. By combining this method dual-comb spectroscopy and a new class of ultrafast lasers, we perform high-resolution (10-80 MHz, 0.0003-0.0027 cm-1) spectroscopic measurements across the whole frequency range 1.5 45 THz (6.6–200 μm), excluding strongly absorbing Reststrahlen band lattice resonances at 4.5–9 THz, instantaneous spectral coverage exceeding octave (e.g., 9–22 μm). As pump source, use pair mutually coherent low-noise combs centered 2.35 μm produced by mode-locked solid-state Cr:ZnS lasers. To produce molecular 'sensing' comb in long-wave infrared region, one two driving down-converted via Intrapulse Difference Frequency Generation (IDFG) ZGP or GaSe nonlinear crystals. The second doubled crystal near-IR for EOS. A low intensity phase noise our system allows capturing vast amount comb-mode resolved (mode spacing 80 MHz) information (⪆200,000 lines) up video rate 69 Hz. This result was also facilitated high IDFG conversion efficiency ⪆10% crystal). Our long-wavelength IR low-pressure gases: ethanol, isoprene, dimethyl sulfide reveal features that had never been explored before.

Language: Английский

Citations

0