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Turnov, Czech Republic

Mares J.A.,ASCR Institute of Physics Prague | Nikl M.,ASCR Institute of Physics Prague | Beitlerova A.,ASCR Institute of Physics Prague | Horodysky P.,CRYTUR Ltd. | And 3 more authors.
IEEE Transactions on Nuclear Science | Year: 2012

We summarize the latest R&D state-of-art of Ce 3+ and Pr 3+-doped mixed (Lu xY 1-x) 3Al 5O) 12 (LuYAG) garnet scintillator crystals and compare their properties with those of Lu 3 Al 5O) 12 (LuAG) and Y 3Al 5O) 12 (YAG) single crystal analogues. Light yield, energy resolution and proportionality were studied under radioisotope excitation within 8-1300 keV energy range. The highest light yield of about 27000 ph/MeV is obtained in the newest prepared Ce 3+-doped LuAG crystals while up to 17000 ph/MeV was measured in the Pr 3+-doped ones. On the contrary, the energy resolution and proportionality are noticeably better in the Pr 3+-doped crystals. Mixed Ce 3+-or Pr 3+-doped Lu xY 1-xAG (x=0.9-1) crystals show comparable light yield and energy resolution compared to those doped pure LuAG, but the content of slow components in scintillation pulses lower. © 2012 IEEE. Source


Fibrich M.,Czech Technical University | Sulc J.,Czech Technical University | Jelinkova H.,Czech Technical University | Nejezchleb K.,CRYTUR Ltd. | Skoda V.,CRYTUR Ltd.
Laser Physics Letters | Year: 2010

In the present work we report on two wavelength generation of Pr:YALO3 laser reached by Lyot filter tuning at room temperature. Laser emission at two transitions in the visible part of the electromagnetic spectrum (747 nm and 720 nm) has been demonstrated employing the broadband laser resonator mirrors in connection with the tuning element (Lyot filter). As a pumping source, GaN laser diode designed for operation around 448 nm wavelength and providing an output power of up to 1 W was utilized. © 2010 by Astro Ltd. Source


Jelinkova H.,Czech Technical University | Fibrich M.,Czech Technical University | Cech M.,Czech Technical University | Nejezchleb K.,CRYTUR Ltd. | Skoda V.,CRYTUR Ltd.
Laser Physics Letters | Year: 2010

In this contribution we report on blue generation of Pr:YAP laser under flash-lamp pumping at room temperature. Stimulated emission at 373.5 nm has been reached by intracavity frequency doubling of the red-emitting Pr:YAP laser operating in Q-switched pulsed regime at a fundamental wavelength of 747 nm. For Q-switching, electro-optical modulator based on LiNbO3 Pockels cell in quarter-wave configuration was used. Employing BBO crystal as a nonlinear medium for second harmonic generation, blue radiation with a pulse energy and length of 380 μJ and 38 ns, respectively, were generated. The red-to-blue conversion efficiency was determined to be more than 31%. © 2010 by Astro Ltd. Source


Fibrich M.,Czech Technical University | Sulc J.,Czech Technical University | Jelinkova H.,Czech Technical University | Nejezchleb K.,CRYTUR Ltd. | Skoda V.,CRYTUR Ltd.
Optics Letters | Year: 2010

We report the cw blue generation of Pr:YAP laser emission at room temperature, which has been achieved by intracavity frequency doubling of the near-IR-emitting Pr:YAP laser operating at a fundamental wavelength of 747 nm. For active medium pumping, a GaN laser diode providing up to 1W of output power at ∼448 nm was used. With beta barium borate crystal employed as a nonlinear medium, 12.3 mW of output power at 373.5 nm has been obtained. © 2010 Optical Society of America. Source


Fibrich M.,Czech Technical University | Jelinkova H.,Czech Technical University | Sulc J.,Czech Technical University | Nejezchleb K.,CRYTUR Ltd. | Skoda V.,CRYTUR Ltd.
Optics Letters | Year: 2010

A cw Pr : YAlO3 microchip-laser operation in the near-IR spectral region is reported. A microchip resonator was formed by dielectric mirrors directly deposited on the Pr:YAlO3 crystal surfaces. For active medium pumping, a GaN laser diode providing up to 1 W of output power at ∼448 nm was used. 139 mW of laser radiation at 747 nm wavelength has been extracted from the microchip-laser system. Slope efficiency related to the incident pumping power was ∼25%. © 2010 Optical Society of America. Source

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