New Ca10Li(VO4)7 laser host: growth and properties

Alexey N. Shekhovtsov 1Myron B. Kosmyna 1Viacheslav M. Puzikov 1Boris N. Nazarenko 1Wojciech Paszkowicz 2Akram Behrooz 2Przemysław Romanowski 2Anatoliy S. Yasukevich 3Nikolay V. Kuleshov 3Maxim P. Demesh 3Wojciech Wierzchowski 4Krzysztof Wieteska 5Carsten Paulmann 6

1. Institute for Single Crystals NAS of Ukraine (ISC), 60 Lenin Ave., Kharkov 61001, Ukraine
2. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
3. Belarussian National Technical University (BNTU), F. Skariny, 65, Minsk 220027, Belarus
4. Institute of Electronic Materials Technology (ITME), Wólczyńska 133, Warszawa 01-919, Poland
5. National Centre for Nuclear Research, Radioisotope Centre POLATOM (NCNR), Andrzeja Soltana 7, Otwock-Świerk 05-400, Poland
6. HASYLAB at DESY, Notkestr., Hamburg 22607, Germany

Abstract

The unique combination of physical-chemical properties of the vanadate crystals makes them promising hosts for active elements of diode-pumped high-efficient CW, Q-switched and mode-locked lasers. The particular advantages of these materials are high thermal conductivity, chemical stability, low lasing threshold, and high lasing efficiency. The stimulated emission cross section of Nd3+ is much larger than that of YAG:Nd crystal.

Disordered calcium vanadates with trigonal structure are attractive materials for non linear optics because of efficient second harmonic generation [1]. Moreover disordered calcium vanadates are promising hosts for diode pumping lasers. The Ca10Li(VO4)7 vanadate was chosen for investigations of crystal growth and laser application abilities.

A solid state synthesis was carried out to produce Ca10Li(VO4)7 compound. For the growth process, an automatic “Analog” puller equipped with a weight control system was used. Cylindrical crystals of diameter up to 25 mm and length up to 50 mm were grown from a [001] oriented seed by the Czochralski technique. The pure crystals were of yellow colour, whereas Nd doped crystals were lilac.

The crystal structure of Ca10Li(VO4)7 single crystal was determined by the powder diffraction method. Defect structure of crystal was studied with the use of both, high-resolution diffraction using a laboratory instrument and X-ray topographic techniques employing synchrotron radiation at the Hasylab laboratory (Hamburg).

Polarized absorption and luminescence spectra of Nd doped Ca10Li(VO4)7 crystal were investigated in details. Spectral and temporal characteristics of Nd3+ luminescence associated with 4F3/24I9/2, 4I11/2 and 4I13/2 transitions were studied. At Nd3+ doping the laser oscillation was obtained under flash lamp pumping. The slope efficiency of 0.87% was achieved in the free-running mode. The ways of lasing efficiency increasing are discussed.

 

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Presentation: Oral at 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17, Topical Session 6, by Alexey N. Shekhovtsov
See On-line Journal of 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17

Submitted: 2013-03-29 14:21
Revised:   2013-03-29 14:21