Article

Electrooptically Q-switched mid-infrared Er : YAG laser for medical applications

Military University of Technology, Warszawa, Masovian Voivodeship, Poland
Optics Express (Impact Factor: 3.49). 11/2004; 12(21):5125-30. DOI: 10.1364/OPEX.12.005125
Source: PubMed

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.

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    • "In the past several decades, much attention has been paid on the development of compact mid-infrared ( $ 3 μm) fiber laser owing to its extensive applications such as medical surgery, remote sensing and light detection and ranging (LIDAR) [1] [2] [3]. Er 3 þ is a suitable candidate active ion for achieving above applications due to the transition of 4 I 11/2 -4 I 13/2 at 2.7 μm. "
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    ABSTRACT: In this paper, Er3+ doped Y2O3 and Nb2O5 modified germanate glasses possessing good thermal stability are reported. On the basis of absorption spectra and Judd-Ofelt theory, a detailed investigation of Judd-Ofelt intensity parameters (Ω2,4,6) and radiative properties is carried out. Moreover, emission cross section at 2.7 μm is calculated based on Füchtbauer-Ladenburg equation and compared with other Er3+ doped glass systems. A reasonable energy transfer mechanism is proposed. It is interesting that the emission cross section and radiative transition probability in 5 mol% Nb2O5 modified germanate glass are much larger than those with 5 mol% Y2O3. Results indicate that present germanate glasses along with excellent 2.7 μm spectroscopic performance might have potential application for mid-infrared fiber laser.
    Full-text · Article · Jan 2014 · Journal of Quantitative Spectroscopy and Radiative Transfer
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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. "
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    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.
    Full-text · Article · Apr 2013 · Scientific Reports
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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 lasers
    Full-text · Article · Jun 2011 · Opto-Electronics Review
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