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Solid-state amplifiers operating in the spectral region around 2 µm are interesting for environmental monitoring, high resolution molecular spectroscopy, frequency metrology, and medicine [1]. Holmium-doped crystals employed as gain materials in amplifiers operating near 2 µm are attractive for their high emission cross-sections and spectrally broad transition.
We report on the first demonstration of passive mode-locking laser operation of a diode-pumped Tm:GdLiF4 crystal. Pulse trains with 20-ps duration, average power of ~100 mW, and repetition rate of 75 MHz are obtained.
The purpose of this study is to evaluate the information content provided by the fluximetry information and the analysis of fetal heart rate (FHR) signals, obtained from cardiotocographic recordings, during prenatal monitoring, in a high risk population. The parameters assessed on FHR signals are divided in: (i) time domain parameters (ii) frequency domain parameters, and (iii) the complexity parameters:...
Solid-state lasers emitting in the 2 mum spectral region find important applications in remote sensing and gas detection, in high-resolution molecular spectroscopy, in frequency metrology, in medicine and in optical communications. Thulium- doped crystals employed as active materials in lasers operating near 2 mum are attractive especially for their wide tunability and high efficiency, besides the...
The measurement of the space-time structure variations induced by strong cosmic events (supernovae, coalescing binaries of neutron stars, etc.) requires an oscillator with a relative stability of 10-21 on time scales typically ap100 ms. We demonstrate that the Virgo interferometer with a wavelength of 1.064 degm has a laser frequency with an in-loop stability of 1.0 times 10-21 on a 100 ms time scale,...
We present the first observation of cryogenic operation in an all-solid-state refrigerator. A temperature drop of ~150 K is demonstrated in a 0.2 cm3 rare-earth doped fluoride crystal (Yb:YLF) using anti-Stokes fluorescence, at a record cooling power of 110 mW. Lowest electronic transition within Yb3+ Stark manifold along with cavity enhanced absorption and thermal-load management were key in achieving...
We report on the spectroscopy and laser results of diode pumped Pr-doped fluorides. We obtained efficient laser emission in the visible range with LiYF4, LiLuF4 and LiGdF4 crystals.
In this work a longitudinally pumped, widely tunable, solid state Yb:YLF laser was developed with special design for applications to optical frequency metrology, LIDAR measurements in the atmosphere and for absolute frequency stabilization. The YLF crystalline host, combined with efficient diode pumping, allows for wide wavelength tunability at around 1.03 mum. The novel laser source is being thoroughly...
We report on the first demonstration of passive mode-locked operation of a diode-pumped Yb:KYF4 crystal. Transform-limited pulses with duration of 170 fs, average power of 60 mW, and repetition rate of 55 MHz are obtained.
In this work a longitudinally pumped, widely tunable, solid state Yb:YLF laser was developed with special design for applications to optical frequency metrology, LIDAR measurements in the atmosphere and for absolute frequency stabilization. The YLF crystalline host, combined with efficient diode pumping, allows for wide wavelength tunability at around 1.03 mum. The novel laser source is being thoroughly...
The authors report on the spectroscopy and laser results of diode pumped Pr-doped fluorides. We obtained efficient laser emission in the visible range with LiYF4, LiLuF4 and LiGdF4 crystals.
We report on the first demonstration of passive mode-locked operation of a diode-pumped Yb:KYF4 crystal. Transform-limited pulses with duration of 170 fs, average power of 60 mW, and repetition rate of 55 MHz are obtained.
In this paper, cw diode-pumped Yb-doped fluoride lasers, based on KYF4 and LiYF4 active crystals, are reported with wavelength tunability ranges wider than 55 nm. The V-shaped laser cavity used in the laser experiments is composed by a high-reflectivity (HR) plane mirror, a HR curved mirror and a plane output coupler. The laser crystal is placed at Brewster angle close to the input mirror and is longitudinally...
We report development, spectroscopic and laser investigation of a novel mid-infrared Cr:ZnS/sub 0.42/Se/sub 0.58/ active medium, exhibiting similar to Cr:ZnS and Cr:ZnSe spectroscopic properties except for the broader emission, making it promising for tuning and mode-locking purposes.
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