Spectroscopy and laser performance of in-band pumped Er:LLF and Er:YLF crystals

© 2016 IEEE.Spectroscopic properties and continuous-wave laser performance of in-band pumped Er:LiLuF4 and Er:LiYF4 crystals were investigated. For Er:LiLuF4 crystal maximum slope efficiency of 44 % was obtained at 1609 nm wavelength. Er:LiYF4 crystal laser operation was demonstrated for the first time under in-band pumping. Output power of 58 mW and slope efficiency of 21 % at 1606 nm were achieved

Micro-crystallization and spectroscopic properties of Er, Yb:RAl-borates (R=Y, Gd) obtained in RAl<inf>3</inf>(BO<inf>3</inf>)<inf>4</inf>–K<inf>2</inf>Mo<inf>3</inf>O<inf>10</inf>–B<inf>2</inf>O<inf>3</inf>–R<inf>2</inf>O<inf>3</inf> and RAl<inf>3</inf>(BO<inf>3</inf>)<inf>4</inf>–B<inf>2</inf>O<inf>3</inf> systems

© 2016 Elsevier B.V.The spontaneous YAl3(BO3)4 (YAB) and GdAl3(BO3)4 (GdAB) crystals (of nominal composition and co-doped with Er and Yb) up to 4–5 mm in length were grown from high-temperature solutions using K2Mo3O10 based fluxes in the temperature range of 1120–900 °C. Glass–ceramic composites based on the YAB and GdAB micro-crystals have been prepared by quenching YAB–B2O3 and GdAB–B2O3 melts and characterized by X-ray diffraction and spectroscopic methods. The vitrified melt was shown to contain micro- and nano-crystalline rare-earth borate phases. Their distribution over the composites has been investigated by electron microscopy and three-dimensional X-ray tomography. The absorption spectra of these materials co-doped with erbium and ytterbium as well as luminescence spectrum were demonstrated

Spectroscopy and femtosecond laser performance of Yb3+:YAlO3 crystal

We report what we believe to be the first demonstration of cw and passively mode-locked Yb3+:YAlO3(Yb:YAP) laser operation under diode pumping. Spectroscopic properties of a 0.6 at.%Yb3+-doped YAP single crystal were investigated. Output power up to 1.2 W with slope efficiency of 64.5% in the cw regime and 225 fs pulse duration with average power of 0.8 W from a mode-locked Yb:YAP laser were demonstrated

Micro-crystallization and spectroscopic properties of Er, Yb:RAl-borates (R=Y, Gd) obtained in RAl<inf>3</inf>(BO<inf>3</inf>)<inf>4</inf>-K<inf>2</inf>Mo<inf>3</inf>O<inf>10</inf>-B<inf>2</inf>O<inf>3</inf>-R<inf>2</inf>O<inf>3</inf> and RAl<inf>3</inf>(BO<inf>3</inf>)<inf>4</inf>-B<inf>2</inf>O<inf>3</inf> s

© 2016 Elsevier B.V.The spontaneous YAl3(BO3)4 (YAB) and GdAl3(BO3)4 (GdAB) crystals (of nominal composition and co-doped with Er and Yb) up to 4-5mm in length were grown from high-temperature solutions using K2Mo3O10 based fluxes in the temperature range of 1120-900°C. Glass-ceramic composites based on the YAB and GdAB micro-crystals have been prepared by quenching YAB-B2O3 and GdAB-B2O3 melts and characterized by X-ray diffraction and spectroscopic methods. The vitrified melt was shown to contain micro- and nano-crystalline rare-earth borate phases. Their distribution over the composites has been investigated by electron microscopy and three-dimensional X-ray tomography. The absorption spectra of these materials co-doped with erbium and ytterbium as well as luminescence spectrum were demonstrated

Er:KY(WO42 and Er:LiYF4 crystals for eye-safe in-band pumped lasers

© OSA 2015. Laser operation of in-band pumped Er:KY(WO4)2 and, for the first time to our knowledge, Er:LiYF4 crystals was demonstrated. The maximal slope efficiencies of 40% and 21% were obtained for Er:KY(WO4)2 and Er:LiYF4 crystals, respectively

http://ntv.ifmo.ru/file/article/10373.pdf

Comparative analysis of spectral and luminescent properties for glasses SiO2-Al2O3-MgO-K2O-TiO2 doped with chromium ions and forsterite nano-glass ceramic have been done. Initial glasses were obtained by using a conventional melt quenching method. Glass ceramics were produced by the two-stage secondary heat treatment of initial glasses. At the first step of the heat treatment nucleation centers were formed at 700º C. At the second step there was an increase of Mg2SiO4: Cr crystalline phase. Crystalline phase composition and the crystals size were determined by X-ray diffractometer. It is shown that the crystalline phase of Mg2SiO4 (forsterite) is precipitated during the heat treatment. Valency state and the chromium ion position in a forsterite or a glassy matrix are determined according to luminescence and absorption spectra. Identification of absorption and luminescence bands in initial and heat-treated samples is carried out. The dependence between spectral and luminescent properties of chromium and heat treatment modes is examined. The results demonstrate that ions of the trivalent and tetravalent chromium are transforming to the forsterite crystalline phase during the heat treatment, and a part of them remains in the glassy phase. Presented research results can be used for the development of glasses and nanoscale glassceramic for fiber tunable lasers and broadband optical amplifiers of a near infrared range which are used in information and telecommunication technologies

Continuous wave diode pumped Yb:LLF and Yb:NYF lasers

Experimental and theoretical results of investigation of CW Yb:LiLuF4 (Yb:LLF) and Yb:Na4Y6F22 (Yb:NYF) lasers under longitudinal diode laser pump are reported. Slope efficiencies of 41%, 58% with 0.21, 0.53 W of output powers were obtained for the Yb:LLF and Yb:NYF lasers, correspondingly. The Yb:NYF laser demonstrated tunability in the region from 1005 to 1061 nm. The mathematical modelling of CW laser operation predicts under optimized laser parameters optical to optical efficiencies of about 55% and 51% for Yb:LLF and Yb:NYF lasers, respectively. © 2009 Elsevier B.V. All rights reserved

Laser performance of Er-doped potassium double tungstate epitaxial layers

© 2018 IEEE. Laser operation of Er-doped epitaxial layer of monoclinic double tungstate composition grown onto undoped KYW substrate is demonstrated for the first time. Maximum output power of 16 mW with slope efficiency of 64% is achieved at 1606 nm under direct in-band pumping by a diode-pump Er,Yb-laser at 1522 nm

Laser performance of in-band pumped Er : LiYF4 and Er : LiLuF4 crystals

Spectroscopic properties of Er : LiLuF4 and Er : LiYF4 crystals in the spectral region near 1.5 mm and the lasing characteristics of these crystals under in-band pumping at a wavelength of 1522 nm are studied. With the Er : LiLuF4 crystal, the maximum slope efficiency with respect to the absorbed pump power was 44 % at a wavelength of 1609 nm. Continuous-wave operation of an in-band pumped Er : LiYF4 laser is obtained for the first time. The output power at a wavelength of 1606 nm was 58 mW with a slope efficiency of 21%

Diode-pumped continuous Wave Tm:KLu(WO<inf>4</inf>)<inf>2</inf> and Tm:KY(WO<inf>4</inf>)<inf>2</inf> microchip lasers

© 2016 IEEE.Laser performance of Tm doped KLu(WO4)2 and KY(WO4)2 crystals was investigated in a microchip cavity configuration with fiber coupled laser diode as a pump source. The highest output power of 1013 mW with 51 % slope efficiency was obtained for Tm:KY(WO4)2 crystal. Using Tm:KLu(WO4)2 crystal output power of 912 mW and slope efficiency of 38 % were achieved