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We demonstrate passive mode-locking of a Nd:Sc0.2Y0.8SiO5 laser using a semiconductor saturable absorber mirror. The pulse train shows output power of 0.5 W and pulse duration of 3.5 ps at repetition rate of 118 MHz.
Our previous studies indicated that convex polyhedron PETs, such as dodecahedral PET, are able to achieve high performances similar to those of S-PETs. A convex polyhedron PET consisting of a couple of flat detectors is much easier to be constructed compared to an S-PET that needs detectors with curved surfaces. Typical convex polyhedrons suitable for PET include the dodecahedron (a regular convex...
Recently, diode-pumped solid-state lasers based on disordered Nd-doped crystals have attracted significant attention. In mode-locked operation they have a potential to generate tunable laser radiation with pulse duration in sub-picosecond time scale as well as to emit muti-wavelength ultrashort pulses which makes them attractive as a source for terahertz generation [1]. Nowadays, the binary and ternary...
An experimental investigation on the laser performance of an α-oriented Tm,Ho: YAIO3 crystal end-pumped by a wavelength tunable Ti:Sapphire laser is presented in this paper. Single- and dual-wavelength operations of Tm,Ho:YAIO3 lasers have been investigated in detail. Maximum output powers of 890mW at 2119nm, 836mW at 2103nm and 487mW at 2130nm for the α-oriented Tm,Ho:YAIO3 crystal have been obtained,...
By merging Yb fiber oscillator and cryogenically cooled DPSS Yb3+,Na+: CaF2 RA we have generated 195-fs 2-mJ pulses at a 1-kHz repetition rate. Amplification substantially beyond 2 mJ is feasible by improving the quality of surface polishing and AR coatings, as well as by optimizing the RA cavity. Spectral shaping of the seed is crucial for amplification of broad spectra and shows potential for attaining...
Using a novel broadband Yb-doped crystal close-loop cooled at -130degC we demonstrate a 2-6-W multi-kilohertz amplifier delivering sub-200-fs pulses with energies up to 2 mJ. This technology is straightforwardly scalable toward a kHz-repetition-rate multi-mJ output.
Absorption, photoluminescence spectra and CW lasing parameters of an Yb3+- and Na+-codoped CaF2 laser crystal are measured in the temperature range from 5 K to 290 K. The crystal appears to be a promising host for broadband multi-mJ kHz CW-pumped regenerative amplification.
Morphology and microstructure evolution of Al0.3Ga0.7N epilayers grown on GaN/sapphire templates with low-temperature (LT) AlN interlayers (ILs) by means of metal organic chemical vapor deposition have been investigated by transmission electron microscopy and atomic force microscopy. It is found that the IL improves the surface morphology, and suppresses edge-type threading dislocations (TDs). When...
Micromachining of bulk piezoelectric substrates for fabrication of high frequency, broadband piezoelectric composite transducers is reported in this paper. A deep reactive ion etching process was developed for bulk PMN-PT single crystal etching with an aspect ratio of >8. A piezoelectric composite with a resonance of 75 MHz was fabricated and the electromechanical coupling coefficient was measured...
Result of diode-pumped cw laser action of Yb:GYSO are demonstrated for the first time. The laser wavelength could be tuned from 1030 to 1089 nm, and a slope efficiency of 57% was achieved.
A diode pumped cw laser operation based on 5-at.% doped Yb:GSO crystal was reported. The optical conversion efficiency of 64.5% at 1089 nm was achieved and the tuning range extends to ~65 nm.
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