A5005338913- Solid State Laser Technologies
- Laser Design and Applications
- Photorefractive and Nonlinear Optics
- Optical and Acousto-Optic Technologies
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- Ocular and Laser Science Research
- Cryospheric studies and observations
- Isotope Analysis in Ecology
- Optical properties and cooling technologies in crystalline materials
- Atomic and Molecular Physics
- Laser Applications in Dentistry and Medicine
- Optical Coherence Tomography Applications
- Spectroscopy and Chemometric Analyses
- Geology and Paleoclimatology Research
- Transition Metal Oxide Nanomaterials
- Random lasers and scattering media
- Pesticide Residue Analysis and Safety
- Water Quality Monitoring and Analysis
- Spectroscopy Techniques in Biomedical and Chemical Research
- Muon and positron interactions and applications
- Advanced Fluorescence Microscopy Techniques
- Laser Material Processing Techniques
National Institute of Advanced Industrial Science and Technology
2023-2025
RIKEN
2007-2023
Nitto RIKEN (Japan)
2008-2023
RIKEN Center for Advanced Photonics
2014-2023
Waseda University
2018
Photonics (United States)
2016
Tokyo University of Science
2006-2010
Institute for Solid State Physics and Optics
2008
Nippon Soken (Japan)
2007
Tokai University
2004
The thermal stability of perovskite solar cells (PSCs) remains a critical challenge for their integration into power grid applications. Incorporating additives Spiro-OMeTAD has been shown to enhance conductivity, enabling increased thickness the hole-transport layer (HTL), which is essential scalable fabrication techniques such as blade coating roll-to-roll processing. However, sufficient thermally durable with suitable yet be proposed. Here, we successfully demonstrate stable PSCs by...
We demonstrated a high-pulse-energy, laser-diode-pumped Tm:YAG laser in AO Q-switched operation. In experiments, we introduced composite-type rod with undoped endcaps. The was pumped by 785-nm quasi-continuous-wave diodes side-pumping configuration. To obtain high energy and beam quality, designed cavity utilizing the thermal lens effect of rod. A output 128 mJ at 10 Hz pulse width 160 ns obtained from oscillator room temperature, slope efficiency reached 14%. quality TEM <sub...
We have developed a mid-infrared (mid-IR) tunable Cr:CdSe laser with nanosecond pulse operation. A broad tuning range from 2.25 to 3.08 µm and an output energy exceeding 4 mJ at 2.64 μm were demonstrated. The maximum conversion for absorbed reached 35% when the pump fluence was 2.1 J/cm2. showed that is attractive material obtaining high-energy pulses in mid-IR region has high potential biomaterial processing.
We demonstrated a Q-switched, Tm:YAG-laser-pumped electronically tuned Cr:ZnSe laser, which was equipped with an acousto-optic tunable filter as wavelength-tuning element. A tuning range from 2.17 to 2.71 μm and maximum output energy of 7.9 mJ at 2.41 were realized. The conversion efficiency reached 34.1% μm. In addition, the laser produced high-quality beam in TEM(00) mode.
The results of coupled thermo-optical modeling Tm,Ho solid-state laser operation are reported. A rate dynamics model integrated together with a TEM00 distribution for the total number stimulated photons is two-dimensional time-dependent heat transfer model. includes absorption, release, and inside crystal as well thermal effect spontaneously emitted infrared radiation. In water cooled this radiation shown to be absorbed within boundary layer, producing significant inhibition dissipation...
We have developed an electronically tuned Cr:ZnSe master oscillator power amplifier with nanosecond pulse operation. The system produced a broad tuning range from 2.26 to 2.66 μm and output energy exceeding 50 mJ was obtained over of 100 nm. maximum conversion reached 46.6% at wavelength 2.41 when the pump fluence 1.4 J/cm2. In addition, we show that is excellent gain medium for pulsed laser amplifiers obtain high in mid-IR region extraction efficiency under low input mJ/cm2 order.
Muonic hydrogen is a bound state of proton and negative muon. Its Bohr radius 200 times smaller than that an electronic atom. Therefore, spectroscopy the muonic highly sensitive to finite size effect proton. Recent years, charge was determined by laser Lamb shifts in The experiment significantly results past measurements. This anomaly called "proton puzzle" it has been important unsolved problem subatomic physics. Towards solving puzzle, new measurement ground-state hyperfine splitting...
Background and Objective Mid‐infrared erbium: yttrium‐aluminum‐garnet (Er:YAG) erbium, chromium: yttrium‐scandium‐gallium‐garnet (Er,Cr:YSGG) lasers (2.94‐ 2.78‐μm, respectively) are utilized for effective dental hard tissue treatment because of their high absorption in water, hydroxide ion, or both. Recently, a mid‐infrared tunable, nanosecond pulsed, all‐solid‐state chromium‐doped: cadmium‐selenide (Cr:CdSe) laser system was developed, which enables oscillation the broad spectral range...
Since resonant absorption of light caused by a variety different molecular bond occurs in the mid-infrared (MIR) wavelength region, many applications using tunable MIR lasers have been reported. However, applicable fields restricted their large size and high cost equipments. Therefore, we are developing compact laser an optical parametric oscillator (OPO). To obtain long term stability conversion efficiency, diode-pumped Q-switched Tm,Ho:YAG ceramic with 2.1 μm was adopted for pump source. A...
We report on an all-solid-state rapidly tunable pulsed coherent 6-10 μm light source achieved in optical parametric oscillator (OPO) pumped with electronically tuned Cr:ZnSe laser and its application to lidar remote sensing for environmental detection. designed a system using the telescope primary mirror of 50 cm high-efficient HgCdTe detector. The would be valuable measurement chemical agents 100-300 m.
Many plants, including fruits and vegetables, release biogenic gases containing various volatile organic compounds such as ethylene (C2H4), which is a gaseous phytohormone. Non-destructive in-situ gas sampling technology to detect trace C2H4 released from plants in real time would be attractive for visualising the ageing, ripening, defence reactions of plants. In this study, we developed detection system with limit 0.8 ppb (3σ) using laser absorption spectroscopy. The consists mid-infrared...
We investigated the design of an acousto-optic tunable filter (AOTF) as a wavelength-tuning element laser in terms dependences diffraction efficiency, bandwidth and stability wavelength on internal temperature AOTF. In simulation, efficiency reached more than 90% region from 700 to 1000 nm, variation was less ±1.0% at temperatures 20 30 °C experiment, we demonstrated that AOTF induces shift 0.12 nm/°C. Most experimental results for output characteristics with agreed those predicted numerically.
Abstract The development of mid-infrared (mid-IR) tunable lasers has been driving various laser spectroscopic technologies. Herein, we report wavelength-scanning cavity ring-down spectroscopy (WS-CRDS) in the mid-IR region using an electronically tuned Cr:ZnSe (ET-Cr:ZnSe) laser, which could achieve a nanosecond pulse operation, with broad wavelength tuning 2–3 µm. This allowed WS-CRDS-induced trace detection refrigerant, CH 2 F . A limit 0.66 ppm (3σ), and H O was realized wavelength-tuning...
This Letter presents the first, to best of our knowledge, demonstration noncritically birefringent-phase-matched parametric downconversion, which is associated with stimulated emission via vibronic transition in a laser gain medium. The so-called self-difference frequency generation realized along a-axis Cr:CdSe single crystal pumped by Tm:YAG pulse at 2.013 µm, directly producing an infrared spectrum centered 9 µm maximized effective nonlinearity. light source, benefits from broad...
Mid-infrared tunable coherent light sources are used in various laser applications, such as trace gas detection, processing, and biomedical diagnostics. This study demonstrates mid-infrared generation the 8.3-11 µm (i.e., 900-1200 cm-1) spectral range by configuring intracavity difference-frequency (DFG) using ZnGeP2 (ZGP) an electronically tuned Cr:ZnSe laser. The broad tunability is achieved with maximum pulse energies exceeding 100 μJ combining electronic wavelength tuning sligh angle...
Polycrystalline ceramic with activator ions has already become popular material as laser medium. In this study, composite type rod which consisted doped- and undoped-YAG sections was prepared for the experiments. By improvement of pumping chamber, pulse energy 930 mJ obtained from oscillator TEM00 in normal mode at 10 Hz room temperature. Giant generation carried out by inserting an AO Q-switch into cavity. Because limitation surface damage thresholds on mirrors, maximum output up to 21 obtained.
We report a rapid and random wavelength-tuned mid-infrared (IR) light source with difference-frequency generation, using an electronically tuned dual-wavelength-oscillated Ti:Al2O3 laser. A tuning range from 5.4 to 8.2 µm is achieved. The wavelength stability of the mid-IR radiation measured be less than ±1.1 ×10-3 µm, we realize switching speed 1 ms. Using source, real-time monitoring acetone vaporization demonstrated absorption at 7.33 compared water 6.25 µm. results show that our...
We revisit self-difference frequency generation –– nonlinear mixing of the lasing field induced by stimulated emission with its pump source in a laser gain medium employing transition-metal doped chalcogenides along standard birefringent phase-matching techniques for mid-infrared applications. The use an a-cut Cr:CdSe crystal under noncritical PM condition has significantly improved conversion efficiency compared to previous results obtained Cr:ZnSe slab Fresnel phase-matching. To generalize...
Abstract We developed a novel laser melting sampler (LMS) for ice cores to measure the stable water isotope ratios (δ 18 O and δD) as temperature proxies at sub-centimeter depth resolutions. In this LMS system, 2 mm diameter movable evacuation nozzle holds an optical fiber through which beam irradiates core. The intrudes into core, radiation meanwhile melts cylindrically, meltwater is pumped away simultaneously same transferred vial analysis. To avoid isotopic fractionation of vaporization,...
We demonstrated Gaussian-shaped pulse oscillation of gain-switched nanosecond Cr:ZnSe laser based on numerical and experimental research. The pulses with width 56 ns was obtained without any Q-switch devices inside the cavity.
We demonstrated a three-stage Cr:ZnSe power-amplifier pumped with Tm:YAG laser. Maximum pulse energy of 52.2 mJ was obtained at 2.41 μm in the power amplifier. Energy conversion efficiency amplifier reached more than 44%.