Directly diode-pumped femtosecond Cr:ZnS amplifier with ultra-low intensity noise

Weigel, Alexander; Qu, Shizhen; Paudel, Asmita; Sebesta, Aleksandar; Steinleitner, Philipp; Nagl, Nathalie; Poetzlberger, Markus; Pervak, Vladimir; Mak, Kafai

doi:10.1364/ol.475438

Cited by 4 publications

(1 citation statement)

References 25 publications

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“…Even though optical frequency combs were developed almost 25 years ago, which shortly after that led to the Nobel Prize in Physics 2005, only recently there was a significant progress in generating broadband optical frequency combs in the mid-infrared. These achievements became possible due to the new development of mode-locked fiber [3] and solidstate laser [4,5,6] combs and efficient down-converting their frequencies through optical parametric oscillation (OPO) [7,8,9,10], difference-frequency generation (DFG) [11,12], and intra-pulse DFG (IDFG) [13,14] based on advanced χ (2) nonlinear crystals [15]. Furthermore, a new approach to DCS that combines the IDFG method to create an MIR sensing comb and EOS detection technique using a near-infrared (NIR) probe comb was presented in [16], allowing to overcome challenges of the conventional DCS that relies on cryogenically cooled photon detectors that suffer from higher noise and slower response at long infrared wavelengths.…”

Section: Introductionmentioning

confidence: 99%

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

Konnov,

Muraviev,

Vasilyev

et al. 2024

Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII

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

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Section: Introductionmentioning

confidence: 99%

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

Konnov,

Muraviev,

Vasilyev

et al. 2024

Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII

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

Konnov,

Muraviev,

Vasilyev

et al. 2023

APL Photonics

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

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Atmospheric dispersion management in mid-IR mode-locked oscillators

Sorokin¹,

Руденков²,

Tolstik³

et al. 2023

Opt. Express

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

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Directly diode-pumped femtosecond Cr:ZnS amplifier with ultra-low intensity noise

Cited by 4 publications

References 25 publications

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

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

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

Atmospheric dispersion management in mid-IR mode-locked oscillators

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