Richard Švejkar

Richard Švejkar
Czech Technical University in Prague | ČVUT · Department of Physical Electronics

Doctor of Philosophy

About

42
Publications
1,341
Reads
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125
Citations
Introduction
Richard Švejkar currently works at the Department of Physical Electronics, Faculty of Nuclear Sciences and Physical Engineering, the Czech Technical University in Prague. He received his PhD degree in physical engineering from the CTU FNSPE in 2021. He researches near- and mid-infrared solid-state lasers, mostly erbium-doped active media. Now, he researches a short pulse generation at 3 µm.
Additional affiliations
September 2016 - present
Czech Technical University in Prague
Position
  • Researcher
Description
  • Research of solid-state lasers
September 2013 - September 2016
Extreme Light Infrastructure
Position
  • Research Assistant
Education
September 2016 - March 2021
Czech Technical University in Prague
Field of study
  • Laser physic
September 2010 - June 2016
Czech Technical University in Prague
Field of study
  • Laser and electronics

Publications

Publications (42)
Article
The main goal of this work was to present spectroscopic and laser characteristics including the wavelength tunability of Er-doped Gd 3 Ga 3 Al 2 O 12 (Er:GGAG) crystal. Seven Er:GGAG crystals of various Er/Gd concentrations were investigated. The maximum output peak power of 0.99 W with an absorbed pumping peak power amplitude of 5.22 W for the cry...
Article
Full-text available
We report on the first continuous-wave quasi three-level laser emitting in the cyan-blue spectral range in praseodymium-doped oxide materials, as we believe. Pr:YAlO3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setle...
Conference Paper
Er:Y 2 O 3 and Er:Lu 2 O 3 ceramics were used in compact resonator for laser generation in gain-switching regime. The pulse duration 456 ns and 375 ns, and peak power 2.99 W and 3.11 W were obtained with Er:Y 2 O 3 and Er:Lu 2 O 3 , respectively.
Article
Lasers based on erbium ions using ⁴I11/2 →⁴I13/2 transition can generate laser radiation in the spectral range from 2.7 μm to 3 μm. Since the strong absorption peak of water is located at 3 μm, there has been an effort to develop a suitable laser source for various medical applications, e.g. dentistry, dermatology, urology, or surgery. Laser radiat...
Article
Spectroscopic and laser parameters of Er-doped Gd3Ga3Al2O12 crystal (Er:GGAG) are presented in the temperature range 80 - 340 K. The significant influence of crystal temperature on resonantly diode pumped Er:GGAG laser, emitting at 1650.6 nm, was observed. The maximal reached output peak power was 2.8 W with corresponding slope efficiency up to 54...
Conference Paper
Highly doped Er:YAG microchip was prepared to make laser resonator compact and generate short pulses in gain switching regime. Pulse duration 306 ns with peak power 7 W and repetition rate 400 Hz were reached.
Conference Paper
Compact CW Er: YLF laser with output power 2.9 W and slope efficiency 26 % is presented. Using Fe:ZnSe crystal the passive Q-switching was achieved with pulse duration 21 ns, repetition rate 50 kHz, and peak power 252 W.
Article
KLuS 2 single crystal samples undoped and doped with a low (5 %) or high (38 %) concentration of trivalent thulium or ytterbium ions were synthesized in the form of thin hexagonal plates. The low phonon energy (∼220 cm ⁻¹ ) was confirmed using Raman spectroscopy. Samples were studied also by using optical absorption and emission as well as electron...
Conference Paper
Spectroscopic and laser characteristics of Er-doped Gd3Ga3Al2O12 (Er:GGAG) are presented in the temperature range 80 - 300 K. The significant influence of crystal temperature on resonantly diode pumped Er:GGAG laser, emitting at 1648nm, was observed.
Conference Paper
For the first time, laser based on Yb,Ho:GGAG crystal emitting radiation at 2.09 µm and 2.94 µm is presented. The tunability of Yb,Ho:GGAG laser was obtained in spectral bands 2063 - 2113 nm and 2860 - 2944 nm.
Article
The main goal of this work was to prove Er:YAlO3 laser generation at 1623 nm wavelength pumped by fiber coupled 1453 nm or 1461 nm laser diodes. The investigation concerned the influence of temperature ranging from 80 K to 300 K on the spectroscopic and laser properties of an Er:YAlO3 crystal in the eye-safe spectral region. For Er:YAlO3 active med...
Article
In this Letter, for the first time, to the best of our knowledge, a pulse and CW laser based on an Er-doped Gd3Ga2.7Al2.3O12 (Er:GGAG) active medium emitting laser radiation at 2.8 μm are presented. With the longitudinal diode pumping, the maximal output energy of 4.9 mJ and slope efficiency of 13.5% in the pulse regime were reached. Using the bire...
Article
The tunability of Er:SrF2 lasers was investigated at room temperature. Under pulsed laser diode pumping, the mid-infrared (2.75 μm) radiation was obtained with a maximal reached output power amplitude of 1.3W and a slope efficiency up to 9.2 %. Laser tunability was reached using a MgF2 birefringent filter and the tuning range of 123 nm (2690 nm - 2...
Article
In this work, a cryogenic cooled, longitudinal diode-pumped Dy²⁺:CaF2 laser was investigated for the first time. The temperature dependence of the spectroscopy and the laser properties of Dy²⁺:CaF2 are presented. The tested Dy²⁺:CaF2 crystal was a longitudinal pump in a near-IR region (926 nm) by laser diode radiation. The maximal mean output power...
Conference Paper
Mid-infrared 2.73 μm radiation was obtained with diode-pumped Er:SrF2 at room-temperature. Output power amplitude was 1.3W with slope efficiency 9.2% and new maximal tuning range 123 nm (2690 nm - 2813 nm) was reached.
Conference Paper
The temperature influence on diode-pumped Tm(0.4 mol%):CaF2 laser performance and tunability was investigated down to cryogenic temperatures. Laser efficiency up to 21 % and wide, red-shifted, tuning range (1783-1915 nm) was demonstrated at 80 K.
Conference Paper
Glass matrix doped with rare-earth ions is a promising laser active medium for high power laser systems. Due to amorphous structure of glasses the absorption and emission spectra lines are broader in comparison with crystalline materials thus pumping radiation can be absorbed efficiently, moreover much broader gain bandwidth is suitable for generat...
Article
The influence of the phosphorus pentoxide (P2O5) content on the material properties of Er,Yb-doped potassium-lanthanum phosphate glass was studied. Glass samples of the following nominal composition 35.0K2O-6.8Yb2O3-8.0La2O3-0.2Er2O3-50.0P2O5 (in mol%) were prepared from starting materials mixed with five additional amounts of P2O5 (0, 7.5, 15.0, 3...
Conference Paper
The laser and spectroscopic properties of crystal Er,La:SrF2-CaF2 at temperature range 80 - 300 K, which is appropriate for generation of radiation around 2.7 um is presented. The sample of Er,La:SrF2-CaF2 (concentration Er(0.04), La(0.12):Ca(0.77)Sr(0.07)) had plan-parallel face-polished faces without anti-reflection coatings (thickness 8.2 mm). D...
Article
Full-text available
The goal of this work was an investigation of the temperature influence (in range from 80 up to 330 K) on the laser properties of Er:CaF2 ceramics, which is suitable as a gain medium for generation of radiation at 2.7 μm. The tested Er:CaF2 ceramics sample, prepared using a hot-forming technique, was doped with 5.5% of ErF3. The sample was in the f...
Article
The spectroscopic and laser properties of Er:SrF2 crystal were investigated. Laser emission at wavelength 2720.6 nm was demonstrated from the diode pumped Er:SrF2 laser for the first time.
Conference Paper
The goal of our work was preparation and investigation of Er-doped potassium ytterbium lanthanum orthoand metha-phosphate glassy mixtures developed as a solid-state laser active medium. The tested samples were prepared by rapid quenching of molten mixture of starting K2CO3, YbPO4, LaPO4, YbPO4 and P2O5. Their cations molar concentration was as foll...
Conference Paper
The spectroscopic and laser properties of Er:SrF<sub>2</sub> crystal were investigated. Laser emission at wavelength 2720.6 nm was demonstrated from the diode pumped Er:SrF<sub>2</sub> laser for the first time.
Article
Full-text available
Spectroscopic and laser properties of a newly developed high optical quality Er: CaF2 hot-formed ceramic were investigated. Under pulsed 968 nm laser diode pumping, the mid-infrared (2.7 mu m) radiation was obtained with a slope efficiency of 3%. Laser tunability was reached using a birefringent filter and the laser tuning range of 118 nm, from 268...

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Projects

Project (1)
Project
Novel Laser Active Media Genrating Radiation in Mid-infrared Region of the Electromagnetic Spectrum