Double-Peaked Mid-Infrared Generation Based on Intracavity Difference Frequency Generation

Article Engineering, Electrical & Electronic

130 W continuous-wave supercontinuum generation within a random Raman fiber laser

Xin Cheng et al.

Summary: We have generated a 134 W continuous-wave supercontinuum within a random Raman fiber laser, which is the highest power reported so far. The experiment was conducted using a standard telecom fiber and two different pump sources.

OPTICAL FIBER TECHNOLOGY (2022)

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Article Optics

High-power mid-infrared pulse MgO:PPLN optical parametric oscillator pumped by linearly polarized Yb-doped all-fiber laser

Yang He et al.

Summary: The study focused on the performance of a MgO:PPLN-based optical parametric oscillator pumped by an all-fiber Yb-doped fiber laser, investigating factors such as pump repetition rate, pulse width, and waist diameter. Through optimization, a maximum mid-infrared power output of 10.82 W with a conversion efficiency of 13.68% was achieved, resulting in a total output power of 35.4 W.

OPTICS AND LASER TECHNOLOGY (2022)

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Article Optics

Watt-level long-wave infrared CdSe pulsed-nanosecond optical parametric oscillator

Ke Yang et al.

Summary: In this paper, high output powers and good spatial beam quality were demonstrated using signal-resonant pulsed nanosecond optical parametric oscillators with two cadmium selenide crystals. The experiments showed efficient conversion efficiencies and tunable idler wavelengths in both linear and rectangular ring cavity designs.

OPTICS AND LASER TECHNOLOGY (2022)

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Article Optics

Dual-comb optical parametric oscillator in the mid-infrared based on a single free-running cavity

C. P. Bauer et al.

Summary: We demonstrate a free-running single-cavity dual-comb optical parametric oscillator (OPO) pumped by a single-cavity dual-comb solid-state laser. The OPO generates high-power idler and signal beams with narrow linewidth and low noise, making it suitable for sensitive mid-infrared dual-comb spectroscopy applications.

OPTICS EXPRESS (2022)

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Article Chemistry, Analytical

Application of Quantum Cascade Laser-Infrared Spectroscopy and Chemometrics for In-Line Discrimination of Coeluting Proteins from Preparative Size Exclusion Chromatography

Christopher K. Akhgar et al.

Summary: An external-cavity quantum cascade laser-based flow-through mid-infrared spectrometer was used for real-time analysis of protein elutions. The QCL-IR spectrometer's large optical path length, high signal-to-noise ratios, and wide spectral coverage allowed for robust spectra acquisition and accurate quantitation and structural fingerprinting of proteins. The results were in excellent agreement with off-line high-performance liquid chromatography reference analytics, demonstrating the effectiveness of QCL-IR detectors for in-line, real-time protein analysis.

ANALYTICAL CHEMISTRY (2022)

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Article Multidisciplinary Sciences

Analysis of a q-deformed hyperbolic short laser pulse in a multi-level atomic system

N. Boutabba et al.

Summary: This study investigates the effect of a fast laser pulse with a q-deformed hyperbolic function shape in a multi-level atomic system. The exact solution of the Bloch equations is derived to describe the dynamics of a two-level atom excited by a q-deformed laser pulse. The population inversion of a Rubidium 87 three-level atom driven by a classical weak field and a strong q-deformed control laser is analyzed. The dependence of coherence on the q-deformation is also investigated to understand the absorption and dispersion properties of the probe field.

SCIENTIFIC REPORTS (2022)

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Article Chemistry, Multidisciplinary

Performance of a Mid-Infrared Sensor for Simultaneous Trace Detection of Atmospheric CO and N2O Based on PSO-KELM

Guolin Li et al.

Summary: A field deployable sensor was developed in this article using a self-developed 4.58-mu m continuous wave quantum cascade laser for simultaneous detection of carbon monoxide and nitrous oxide. The sensor is based on TDLAS technology and PSO-KELM algorithm to improve detection precision, with validation experiments showing good performance.

FRONTIERS IN CHEMISTRY (2022)

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Article Optics

Simultaneous detection of multiple gaseous pollutants using multi-wavelength differential absorption LIDAR

Ze-hou Yang et al.

Summary: Differential absorption LIDAR (DIAL) is an effective method to remotely detect air pollutants and hazardous chemicals in the atmosphere. A multi-wavelength differential absorption LIDAR (MW-DIAL) is reported, which can simultaneously measure multiple pollutant gases in the atmosphere and improve the precision of the technology.

OPTICS COMMUNICATIONS (2022)

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Article Optics

Femtosecond pulses from a mid-infrared quantum cascade laser

Philipp Taeschler et al.

Summary: Near-transform-limited 630 fs pulses with 4.5 W of peak power are generated by compensating the dispersion of a quantum cascade laser emitting around 8 µm. Their temporal nature is assessed by a new method called asynchronous upconversion sampling. This study opens up new pathways for nonlinear physics in the mid-infrared.

NATURE PHOTONICS (2021)

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Article Optics

Integrated path DIAL for standoff detection of acetone vapors under topographic target condition

M. K. Jindal et al.

Summary: A mid infrared tunable Differential Absorption Lidar (DIAL) has been developed, evaluated by measuring diesel and acetone vapors, and calibrated using transmittance spectra. Acetone, a precursor for IED, was used in field experiments and its concentration was measured at different wavelengths. The study also analyzed the impact of atmospheric interfering molecules on the return signals at online and offline wavelengths.

OPTICS AND LASER TECHNOLOGY (2021)

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Article Chemistry, Multidisciplinary

Development Progress of 3-5 μm Mid-Infrared Lasers: OPO, Solid-State and Fiber Laser

Tingwei Ren et al.

Summary: The 3-5 μm mid-infrared band is an important window for atmospheric transmission, with applications in various fields. Different techniques for realizing mid-infrared laser output have been explored, along with a brief description of the advantages and disadvantages of various mid-infrared lasers.

APPLIED SCIENCES-BASEL (2021)

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Article Optics

Tunable dual wavelength and narrow linewidth laser using a single solid-state gain medium in a double Littman resonator

Diep Van Nguyen et al.

Summary: The proposed scheme allows for the generation of two tunable laser wavelengths with narrow linewidths using only one solid-state laser gain medium, enabling applications in various fields that require tunable dual wavelengths with narrow linewidths.

OPTICS COMMUNICATIONS (2021)

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Article Optics

Room-temperature Fe:ZnSe laser tunable in the spectral range of 3.7-5.3 μm applied for intracavity absorption spectroscopy of CO2 isotopes, CO and N2O

Peter Fjodorow et al.

Summary: An intracavity absorption spectroscopy system based on a broadband Fe:ZnSe laser was developed, achieving sensitive detection of CO2 isotopes, CO, and N2O with low detection limits. The system's sensitivity is limited by the short pump-pulse duration, with possibilities for enhancement discussed.

OPTICS EXPRESS (2021)

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Article Materials Science, Multidisciplinary

Atomic population inversion and absorption dispersion-spectra driven by modified double-exponential quotient pulses in a three-level atom

N. Boutabba et al.

Summary: This study demonstrates control of a three-level atomic system using a modified QEXP control field, achieving atomic population inversion and temporal atomic coherence control, and deriving absorption and dispersion spectra. The proposed modified QEXP pulse achieves an electromagnetically induced transparency window in the absorption spectrum compared to a continuous wave control field.

RESULTS IN PHYSICS (2021)

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Article Optics

Compact dual-crystal Tm,Ho:YLF laser with balanced orthogonal polarization output power

Xinlu Zhang et al.

Summary: In this study, a compact dual-crystal orthogonally polarized Tm,Ho:YLF laser was reported for the first time, achieving balanced orthogonal polarization output power. By inserting uncoated solid state etalons into the resonator, a dual-wavelength single-longitudinal-mode laser with orthogonal polarization was obtained, showing potential applications in differential absorption lidars and coherent THz wave generation.

OPTICS EXPRESS (2021)

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Article Optics

Supercontinuum generation from a quasi-stationary doubly resonant optical parametric oscillator

Chengxiao Ning et al.

Summary: This study reports a quasi-stationary operation state in a femtosecond doubly resonant optical parametric oscillator, demonstrating that power fluctuations can be suppressed through an averaging procedure. The quasi-stationary DRO can be configured to generate broadband supercontinuum with a bandwidth limited only by the parametric gain bandwidth.

OPTICS LETTERS (2021)

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Article Optics