Electrooptically Q-switched mid-infrared Er : YAG laser for medical applications
ABSTRACT An actively Q-switched Er:YAG laser generating pulses at 2.94 microm has been developed and investigated. For a single Er:YAG generator at 3 Hz repetition rate, pulses of 91.2 ns duration and 137 mJ energy have been obtained. It corresponds to pulse train with high-peak power of ~ 1.5 MW. For 10 Hz repetition rate 30 mJ of output energy in single pulse has been achieved. These results, according to our knowledge, are the best world-wide achievements.
- SourceAvailable from: Zhongmin Yang
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- "In recent years, solid state lasers operating around 2.7 μm have attracted more and more attention due to their potential applications in various fields, such as remote sensing, atmosphere pollution monitoring, and military, etc12345. However, during the research process of mid-infrared lasers, there are many kinds of problems which restrict their development, such as the luminous efficiency of rare-earth ions, the stability of host materials, etc6. "
ABSTRACT: Yttrium fluoride YF3:Er(3+) and yttrium oxyfluoride YOF:Er(3+) submicron-crystals with mid-infrared fluorescent emissions were synthesized for the first time. The rhombohedral phase YOF submicron-crystals were synthesized by the crystalline phase transformation from pure orthorhombic YF3 submicron-crystals, which were prepared by co-precipitation method. The composition and morphology were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM), which showed that submicron-crystals were quasi-spherical with the particle size of ~400 nm. A novel formation mechanism of YOF submicron-crystals was proposed. Photoluminescence (PL) spectra indicated the 2.7 μm emission of Er(3+) has remarkably enhanced with the increase of Er(3+) doping concentration, and a novel dynamic circulatory energy transfer mechanism was proposed. Fourier transform infrared spectra (FTIR) were used to demonstrate the change of hydroxyl content. These oxyfluoride submicron-crystals provide a new material for nano/submicron-crystals-glass composites, and open a brand new field for the realization of mid-infrared micro/nano-lasers.Scientific Reports 04/2013; 3:1598. DOI:10.1038/srep01598 · 5.58 Impact Factor
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ABSTRACT: The 2940 nm Er:YAG laser Q-switched mechanically by means of a rotating mirror was developed. It generated the output pulses of up to 30 mJ energy, below 300 ns duration and record repetition rate of 25 Hz. The developed laser was effectively used for the investigation of laser beam interaction with selected organic matter simulants. Keywordserbium lasers–Q-switched lasers–medical applications of lasersOpto-Electronics Review 06/2011; 19(2):206-210. DOI:10.2478/s11772-011-0011-9 · 1.28 Impact Factor
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ABSTRACT: Two types of electro-optically Q-switched Er:Cr:YSGG lasers with different polarizing mechanisms have been operated. For the one Q-switching and polarizing are realized with only a LiNbO3 crystal with both ends cut at Brewster's angle and for the other they are achieved by a cubic LiNbO3 crystal and a Glan-Taylor prism, respectively. The two schemes are compared with regard to both the mechanical and laser Q-switched properties. (© 2006 by Astro, Ltd. Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA)Laser Physics Letters 07/2006; 3(7):349 - 352. DOI:10.1002/lapl.200610020 · 2.96 Impact Factor