Ultrabroadband Midinfrared Pump-Probe Spectroscopy Using Chirped-Pulse Up-conversion in Gases

Shirai, Hideto; Yeh, Tien Tien; Nomura, Yutaka; Luo, Chih-Wei; Fuji, Takao

doi:10.1103/physrevapplied.3.051002

Cited by 20 publications

(16 citation statements)

References 27 publications

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“…These features can be qualitatively described by the Drude model, which treats the free carriers in a solid as the point charges with random collisions. Using the stationary reflectance R = 0.24 for Ge8, the dynamic reflectance R(t ) = R + Δ R(t ) = R × {1 + [Δ R(t )/ R ]} is used to fit the experimental data in Fig. 2.…”

Section: Resultsmentioning

confidence: 99%

“…To prevent the absorption of carbon dioxide and water vapor, the whole system is purged with nitrogen. The details of experiments have been reported in our previous work8.…”

Section: Methodsmentioning

confidence: 99%

“…Based on this novel ultrafast light source, Shirai et al 8. performed the transient pump-probe spectroscopy for Ge bulk crystal with 70-fs-time-resolution.…”

mentioning

confidence: 99%

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Ultrafast carrier dynamics in Ge by ultra-broadband mid-infrared probe spectroscopy

Yeh

Shirai

et al. 2017

Sci Rep

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In this study, we carried out 800-nm pump and ultra-broadband mid-infrared (MIR) probe spectroscopy with high time-resolution (70 fs) in bulk Ge. By fitting the time-resolved difference reflection spectra [ΔR(ω)/R(ω)] with the Drude model in the 200–5000 cm−1 region, the time-dependent plasma frequency and scattering rate have been obtained. Through the calculation, we can further get the time-dependent photoexcited carrier concentration and carrier mobility. The Auger recombination essentially dominates the fast relaxation of photoexcited carriers within 100 ps followed by slow relaxation due to diffusion. Additionally, a novel oscillation feature is clearly found in time-resolved difference reflection spectra around 2000 cm−1 especially for high pump fluence, which is the Lorentz oscillation lasting for about 20 ps due to the Coulomb force exerted just after the excitation.

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Section: Resultsmentioning

confidence: 99%

“…To prevent the absorption of carbon dioxide and water vapor, the whole system is purged with nitrogen. The details of experiments have been reported in our previous work8.…”

Section: Methodsmentioning

confidence: 99%

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Ultrafast carrier dynamics in Ge by ultra-broadband mid-infrared probe spectroscopy

Yeh

Shirai

et al. 2017

Sci Rep

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“…For example, structural dynamics of molecules in the femtosecond time scale was investigated with ultrafast pump-probe spectroscopy using the ultrabroadband MIR probe pulse [9][10][11], free-carrier dynamics in semiconductors were clearly observed in the very wide range of the probe energy [12][13][14], and two-dimensional spectroscopy with the ultrabroadband MIR probe was experimentally demonstrated [15,16].…”

Section: Ultrafast Pump-probe Spectroscopymentioning

confidence: 99%

“…The authors combined the chirped-pulse upconversion technique with the femtosecond 69 pump-probe spectroscopy [12,14] and attenuated total reflection spectroscopy (ATR) [23,24]. As a 70 demonstration of the ATR combined with CPU, the MIR absorption spectra of acetic acid (CH 3 COOH,…”

Section: Carrier-envelope Phase Of the Sub-cycle Mir Pulsesmentioning

confidence: 99%

Development and Application of Sub-Cycle Mid-Infrared Source Based on Laser Filamentation

Fuji¹,

Shirai²,

Nomura³

2017

Applied Sciences

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This paper is a perspective article which summarizes the development and application of sub-cycle mid-infrared (MIR) pulses generated through a laser filament. The generation scheme was published in Applied Sciences in 2013. The spectrum of the MIR pulse spreads from 2 to 50 µm, corresponding to multiple octaves, and the pulse duration is 6.9 fs, namely, 0.63 times the period of the carrier wavelength, 3.3 µm. The extremely broadband and highly coherent light source has potential for various applications. The light source has been applied for advanced ultrafast pump-probe spectroscopy by several research groups. As another application example, single-shot detection of absorption spectra in the entire MIR range by the use of chirped-pulse upconversion with a gas medium has been demonstrated. Although the measurement of the field oscillation of the sub-cycle MIR pulse was not trivial, the waveform of the sub-cycle pulse has been completely characterized with a newly developed method, frequency-resolved optical gating capable of carrier-envelope phase determination. A particular behavior of the spectral phase of the sub-cycle pulse has been revealed through the waveform characterization.

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Single‐Photon Time‐Stretch Infrared Spectroscopy

Sun,

Huang,

et al. 2024

Laser & Photonics Reviews

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Sensitive mid‐infrared (MIR) spectroscopy is highly demanded in various fields ranging from industrial inspection, biomedical diagnosis to astronomical observation. However, the detection sensitivity of conventional MIR spectrometers is severely limited by excessive noises for existing infrared sensors, which hinders widespread use in photon‐scarce scenarios. Here, a broadband MIR single‐photon time‐stretch spectrometer is devised and implemented based on high‐fidelity spectral upconversion and time‐correlated coincidence counting. Specifically, a nanophotonic supercontinuum illumination covering 2.4–4.2 µm is nonlinearly converted to the near‐infrared band, where low‐loss single‐mode fiber and high‐performance silicon detector can be leveraged to facilitate dispersive operation and sensitive detection, respectively. The arrival time for the dispersed upconversion photons is precisely registered with a low‐timing‐jitter photon counter, which enables us to obtain a high spectral resolution about 0.5 cm−1 under a low‐light‐level illumination down to 0.14 photons/nm/pulse. In comparison to previous MIR upconversion spectrometers, the presented time‐stretch architecture favors single‐pixel simplicity and high‐throughput acquisition for the single‐photon spectral measurement. The achieved MIR spectroscopic features of broadband spectral coverage, sub‐wavenumber resolution, single‐photon sensitivity, and room‐temperature operation would stimulate immediate applications in material and life sciences.

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Ultrabroadband Midinfrared Pump-Probe Spectroscopy Using Chirped-Pulse Up-conversion in Gases

Cited by 20 publications

References 27 publications

Ultrafast carrier dynamics in Ge by ultra-broadband mid-infrared probe spectroscopy

Ultrafast carrier dynamics in Ge by ultra-broadband mid-infrared probe spectroscopy

Development and Application of Sub-Cycle Mid-Infrared Source Based on Laser Filamentation

Single‐Photon Time‐Stretch Infrared Spectroscopy

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