A5016772224- Solid State Laser Technologies
- Laser Design and Applications
- Luminescence Properties of Advanced Materials
- Chalcogenide Semiconductor Thin Films
- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Spectroscopy and Laser Applications
- Photorefractive and Nonlinear Optics
- Crystal Structures and Properties
- Photonic Crystal and Fiber Optics
- Laser Material Processing Techniques
- Collaboration in agile enterprises
- Glass properties and applications
- Advanced Chemical Physics Studies
- Business Process Modeling and Analysis
- Scheduling and Optimization Algorithms
- Magneto-Optical Properties and Applications
- Laser Applications in Dentistry and Medicine
- Dental Erosion and Treatment
- Dental Anxiety and Anesthesia Techniques
- Multi-Agent Systems and Negotiation
- Quantum Dots Synthesis And Properties
- Education, Psychology, and Social Research
- Economic and Fiscal Studies
- Laser-induced spectroscopy and plasma
Czech Technical University in Prague
2002-2024
Charles University
2020
This Letter determines the Cr2+-Fe2+ ions energy transfer process parameters in Zn1−xMnxSe:Cr2+,Fe2+ (x=0.3) crystal and demonstrates a dipole-dipole type of nonradiative transfer. The intracavity pumping as well through Zn1−xMnxSe:Cr2+, Fe2+ under 1735 nm excitation by an YLF:Er laser was realized temperature range 78 up to 150 K for first time, best our knowledge. Output pulse 20 μJ at ∼4400 5.5 mJ absorbed pump obtained mode.
Millisecond-pulse laser operation of Fe2+ ions at 78 K is demonstrated in the Zn1-xMnxSe:Fe2+,Cr2+ (x=0.3) crystal under a Tm fiber 1940 nm pumping through Cr2+→Fe2+ energy transfer process for first time, to best our knowledge. The slope efficiency was 1% with respect absorbed nm. central wavelength shift from 4450 up 4510 110 observed. Tunability 4350 4670 achieved using an intracavity tuning element.
Two different mid-infrared (mid-IR) solid-state crystalline laser active media of Cr2+, Fe2+:Zn1-xMnxSe and Fe2+:Zn1-xMgxSe with similar amounts manganese or magnesium ions x ≈ 0.3 were investigated at cryogenic temperatures for three excitation wavelengths: Q-switched Er:YLF the wavelength 1.73 μm, Er:YAG 2.94 gain-switched Fe:ZnSe operated a liquid nitrogen temperature 78 K ∼4.05 μm. The dependence spectral characteristics was measured. Depending on selected output coupler, both systems...
A nonradiative Cr 2+ → Fe ions energy transfer process in Zn 1-x Mn x Se:Cr ,Fe (x = 0.05) single crystal with a to concentration ratio about 2.5:1 was investigated under short-pulse (200 ns) ∼1.73 µm excitation by YLF:Er laser. lasing temperature range from 78 K up 200 achieved and the central oscillation wavelength observed increase 4.1 4.4 µm, depending on of active medium. Moreover, stable “long” pulse (1 ms, 10 Hz) ∼1.71 laser diode were demonstrated. The generated 110 at around ∼4.17...
Temperature dependences of spectroscopic (absorption, fluorescence, lifetime) and laser output properties (energy, oscillation spectra) the Fe 2+ :ZnSe under ~4 μm radiation pumping are presented. Wide spectrum up to ~4.9 is demonstrated.
This paper presents the temperature dependence of spectroscopic and laser properties Fe 2+ :ZnSe single crystal under excitation by radiation at a wavelength ∼4.04µm. Excitation was supported Er:YAG (∼2.94µm) operated in Q-switched or free-running (FR) mode that pumped Fe:ZnSe cooled liquid nitrogen to 78 K. system generated Temperature absorption, fluorescence spectra, decay time ions measured. The optimal allows efficient operation with maximum output energy sought both regimes. It...
This paper presents work carried out within the "ExPlanTech " project (IST - 1999-20171) funded by European Commission Information Technologies Programme. The mission of ExPlanTech is to introduce, customize and exploit a multi-agent production planning technology (ProPlanT system research prototype) in two specific industrial enterprises. An agent driven service negotiations decision process based on usage-centered knowledge about task requirements substitutes traditional activity. We...
Spectroscopic properties of Cr2+ ions in a range cubic Zn1-xMnxSe (x = 0–0.4) solid solutions were investigated. A close to linear decrease 5E level energy resulting both absorption and fluorescence maxima shifts about 30 cm-1 per each 10% Mn was observed. Temperature dependence decay time measured, an increase nonradiative quenching rate with content (x) revealed. The zero-phonon line position (about 4871 cm-1) the 0.4) crystal determined.
The compact tunable Fe <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> :Zn <sub xmlns:xlink="http://www.w3.org/1999/xlink">0.95</sub> Mn xmlns:xlink="http://www.w3.org/1999/xlink">0.05</sub> Se laser at liquid nitrogen temperature (80 K) was investigated. diode-pumped free-runing Er:YAG room-temperature used for pumping of cryogenic-cooled Se. slope efficiency up to 30.5 % reached in non-selective cavity. Using intracavity birefringent...
Chromium ions Cr<sup>2+</sup> are known to have good fluorescence properties in the mid-infrared spectral region around wavelength of 2.5 μm. The aim this study was investigation new laser crystal materials – Zn<sub>0.95</sub>Mn<sub>0.05</sub>Se, Zn<sub>0.70</sub>Mn 0<sub>.30</sub>Se, and Zn<sub>0.75</sub>Mg<sub>0.25</sub>Se doped by comparison their characteristics. spectroscopic parameters as absorption spectra well lifetimes were measured. As optical pumping diode generating radiation at...
Radiation with a wavelength of ~4 µm was used for quasi-collinear excitation the Fe:ZnSe laser. The highest output energy achieved at optimal crystal temperature 230 K generated radiation ~4.5 µm.