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1
Content available remote Obrazowanie MR przy użyciu spolaryzowanego 3^He - jak chcemy badać szczurze płuca w Krakowie
Cieślar K., Dohnalik T.
Postępy Fizyki
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2004
|
T. 55, z. 3
123-127
EN
Magnetic resonance imaging (MRI) with hyperpolarized 3^He is a new method of studying structure and function of lungs. We present a novel low field MRI system based on permanent magnet and the 3^He polarizing unit being built in Krakow. Our system is designed to perform experiments on small animals (rats).
2
Content available remote The 1.3 mu m Q-switched Nd:YAG laser.
Ostrowski R., Marczak J.
Optica Applicata
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2001
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Vol. 31, nr 3
553-562
EN
The paper presents experimental results of investigation of flash lamp pumped Nd:YAG laser operated at wavelength lambda =1.32 mu m. Thresholds and resonator losses have been determined. In the active Q-switched mode, output pulses up to 29 mJ energy and pulse width of 37 ns have been obtained. Moreover, an intracavity Raman laser producing 1.53 mu m radiation when pumped by Nd:YAG laser operated at 1.32 mu m is presented. Output Raman pulses up to 10 mJ energy have been obtained. Raman beam cleanup and 36% energy conversion efficiency, have been observed.
3
Content available remote Resonant cavity enhanced photonic devices.
Bugajski M., Muszalski J., Mroziewicz B., Regiński K., Ochalski T.J.
Optica Applicata
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2001
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Vol. 31, nr 2
273-288
EN
We review our recent works on technology, basic physics and applications of one-dimensional photonic structures. We demonstrate spontaneous emission control in In/sub x/Ga/sub 1-x/As/GaAs planar microcavities with DBR reflectors. The room temperature emission in lambda -sized cavities is enhanced in comparison with its free space value, while in lambda /2-sized cavities suppression of spontaneous emission is observed. The characteristics of spontaneous emission in microcavities depend on the wavelength difference between the emitter and the cavity resonance. It has been shown that ideal tuning of the cavity can be achieved by adjusting sample temperature. In general, observed trends are in agreement with theoretical predictions. These changes to the spontaneous emission process directly affect vertical-cavity laser (VCSEL) properties. An increased coupling efficiency of spontaneous emission into the lasing mode is observed in VCSELs with lambda -sized cavities. We demonstrate the operation of resonant-cavity light emitting diodes (RC LED) and optically pumped VCSELs developed recently at the Department of Physics and Technology of Low Dimensional Structures of the Institute of Electron Technology. The epitaxial growth issues, fabrication technology and basic characteristics of these devices are discussed
4
Content available remote Laser diode pumping of an upconversion laser
Kaczmarek F.
Optica Applicata
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2001
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Vol. 31, nr 2
373-376
EN
Laser diode pumping in commonly applied in all solid state laser devices. In the case of an upconversion laser, i.e., when infrared-to-visible upconversion takes place in a rare-earth doped optical fiber, laser diode pumping is of special interest. Excitation of a single mode optical fiber, typically of core diameter of about 2 mu m, requires that the emitting area of the diode must be limited to 1 mu m *3 mu m, otherwise its emission cannot be focused to a spot of a few micrometers in size. As we have shown, short focal length lenses of high (NA approximately=0.4) ensure the best results. Numerical aperture (NA) matching is of less importance.
5
1.3 [my]m ND:YAG laser passively and actively Q-switched
Ostrowski R., Marczak J., Mierczyk Z.
Journal of Technical Physics
|
2000
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Vol. 41, no 3
295-309
EN
The paper presents experimental results of investigation of flashlamp pumped Nd:YAG laser operated at, wavelengths lambda = 1.318 [my]m, lambda = 1.338 [my]m, lambda = 1.356 [my]m, lambda = 1.414 [my]m and lambda = 1.444 [my]m. Thresholds and resonator losses at these lines have been determined. The laser was also operated at line 1.318 [my]m in the Q-switched mode, both active and passive. In active Q-switching, output pulses up to 29 mJ energy and pulsewidth of 4l ns have been obtained. In passive Q-switching with V'3+:YAG crystalline saturable absorber, on the other hand, output pulses up to 4.5 mJ energy and 35 ns duration have been generated. Moreover, an intracavity Raman laser producing 1.53 [my]m radiation when pumped by Nd:YAG laser operated at 1.318 [mi]m is presented. Output Raman pulses up to 10 mJ energy have been obtained. Raman beam cleanup and 36% energy conversion efficiency have been observed.
6
Content available remote Manipulowanie atomami za pomoca fotonów
Cohen-Tannoudji C.
Postępy Fizyki
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1999
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T. 50, z. 1
2-19
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