1,721,163 research outputs found
Development of a cw Co : MgF2 laser
No full textThe results obtained in the development of a cryogenic cw Co: MgF2 laser, realized at the Dipartimento di Fisica of the University di Pisa are presented. The laser can be tuned continuously in the range between 1.6 and 2.1 mum, with a typical output power of 1-2 W. A preliminary application to the spectroscopy of a Tin: YLF doped crystal is reported by using a photoacoustic apparatus. (C) 2002 Elsevier Science Ltd. All rights reserved
Development of a cw polycrystalline Cr2+: ZnSe laser
No full textWe present the preliminary results regarding the operation of a Cr2+ : ZnSe laser, based on a polycrystalline sample that was prepared at the Dipartimento di Fisica of the University di Pisa. The performance of this active medium for laser action is compared with that of a single crystal, showing the actual possibility of developing good quality systems based on polycrystalline samples. (C) 2002 Elsevier Science Ltd. All rights reserved
Novel approach for solid state cryocoolers
No full textLaser cooling in solids is based on anti-Stokes luminescence, via the annihilation of lattice phonons needed to compensate the energy of emitted photons, higher than absorbed ones. Usually the anti-Stokes process is obtained using a rare-earth active ion, like Yb. In this work we demonstrate a novel approach for optical cooling based not only to Yb anti- Stokes cycle but also to virtuous energy-transfer processes from the active ion, obtaining an increase of the cooling efficiency of a single crystal LiYF4 (YLF) doped Yb at 5at.% with a controlled co-doping of 0.0016% Thulium ions. A model for efficiency enhancement based on Yb-Tm energy transfer is also suggested
Measuring light speed with a modulated laser diode
No full textAbstract. The time of flight (TOF) of a light pulse travelling back and forth and optical path length measurements are used to estimate the velocity of light. The light pulse has a duration of 10 ns, and is obtained from a suitably modified CW commercial laser diode. The TOF is read with a digital oscilloscope connected to two fast sensors, detecting the signals at the switch-on of a laser diode and at the arrival of the light pulse reflected from a plane mirror placed at a known distance
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