In this paper we report on the suitability of Ho3+:LiLuF4 and Ho3+:LaF3 as active media for solid state lasers emitting in the green spectral region. The ground state absorption spectra were measured and employed to calculate the emission cross section spectra via the reciprocity method. These allowed to derive the gain characteristics for various inversion ratios. The decay dynamics of the F-5(4),S-5(2) multiplet, which would act as upper laser level, were investigated to estimate the quantum efficiency. Measurements of the excited state absorption were conducted which showed that stimulated emission is the dominating effect around 550 nm. Laser operation was demonstrated in the green spectral region by employing Ho3+: LaF3 as gain medium. Laser oscillation occurred in a self-pulsed regime with a maximum average output power of 7.7 mW, a repetition rate of 5.3 kHz, and a pulse duration of 1.6 mu s. To the best of our knowledge this constitutes the first green laser emission of a Ho3+-doped crystal at room temperature. (C) 2014 Optical Society of America

The common scheme of femtosecond-laser inscription of waveguides in fluorides is a cladding geometry. The first crystalline Er:LiLuF4-upconversion waveguide laser is reported somewhere else. The poor stability and efficiency of the green emission were caused by nonoptimized cavity and fabrication parameters. In this paper, the mentioned drawbacks were tried to be overcome and an improvement in stability and output power is shown by the application of a circular cladding geometry. An output power of 10 mW at 552.6 nm could be achieved, with an incident pump power on the crystal of 1.5 W at 974 nm.

Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text F. Moglia, C. Brandt, and G. Huber, "Inband-pumped Er3+:LiLuF4 Laser Emitting in the 1.6 µm Spectral Range," in Lasers, Sources, and Related Photonic Devices, OSA Technical Digest (CD) (Optica Publishing Group, 2012), paper AM4A.22. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article

We present the first demonstration of laser oscillation of Ho3+:LiLuF4 in the visible spectral range. Furthermore, we investigated the spectroscopic properties with regard to its potential as an active medium for diode pumped solid state lasers.

We report on the first results of diode pumped laser operation of Pr3+:LaF3 in a quasi continuous wave (qcw) mode with average output powers of up to 80.0 mW (≈ 161.3 mW qcw) and a maximum slope efficiency of 37% at 719.8 nm. Furthermore it was possible to operate the laser at 537.1 nm and 635.4 nm and to tune the emission wavelength from 609 nm to 623 nm. The pump source was an InGaN laser diode with a maximum output power of 1 W at a central emission wavelength of 442 nm.

We have grown an Er3+:LaF3 crystal and present the spectroscopic analysis in order to confirm the possibility to realize an excited state absorption pumped upconversion laser in the green spectral range via near-infrared pumping.

We report on synthesis of europium-doped (Y1−xGdx)2O3 by flame-assisted spray py-rolysis in premixed propane/air flames. Phosphor powders with an average particle size on the order of 0.5 μm were obtained from 0.2 M aqueous solutions of the corresponding metal salts. Relative concentration of gadolinium (x) was varied in the range 0 to 1. For excitation at a wavelength of 254 nm, the highest intensity of photoluminescence was achieved for x = 0.2 (110% of brightness of the samples without gadolinia). Doping pure yttria and gadolinia with nanoparticles of Y2O3:Eu (dBET = 24 nm) was tested. Addition of nanoseeds (up to 50 mol.% in the obtained powders) noticeably decreased surface roughness of phosphor particles.