Optical spectroscopy and diode-pumped laser performance of Nd/sup 3+/ in the CNGG crystal (original) (raw)
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Optics Express, 2007
A bulk crystal of Er 3+ :Yb 3+ :LaMgB 5 O 10 was grown successfully by the top seeded solution growth (TSSG) method. The spectroscopic characterization of this material, including the polarized absorption and fluorescence spectra and the fluorescence decay curve, were recorded. The fluorescence quantum efficiency of the 4 I 13/2 level of Er 3+ ions and the efficiency of energy transfer from Yb 3+ to Er 3+ ions were estimated. Continuous-wave laser output of 160 mW at 1567 nm was realized under the absorbed pump power of 3.1 W in a hemispherical cavity. When the output coupler transmission was 1.7% the absorbed pump threshold was 1.5W and the slope efficiency of the laser was 10.1%. The results show that Er 3+ :Yb 3+ :LaMgB 5 O 10 crystal is a promising laser material.
Multi-wavelength diode-pumped Nd:LGGG picosecond laser
Applied Physics B, 2010
Laser operation near 1.06 µm by a diode-pumped Nd:(Lu x Gd 1−x ) 3 Ga 5 O 12 (Nd:LGGG) disordered crystal has been investigated. Cw oscillation, with a slope efficiency as high as 61% and 230 mW output power, was achieved with 400 mW absorbed power from a 1-W laser diode. Stable passive mode locking with single-or multi-banded spectrum was obtained with a semiconductor saturable absorber mirror (SAM) and a single-prism, dispersion-compensated cavity. Fourier limited pulses with duration ≈3-9 ps and output power ≈40 mW were generated at three well-defined laser transitions in the range 1062-1067 nm.
Efficient diode-pumped Nd:GGG laser operation at 933.6 and 937.3 nm
Applied Physics B, 2012
CW laser emission on the quasi 3-level ( 4 F 3/2 → 4 I 9/2 ) transition in Nd:GGG is reported for different pump focusing and resonator dimensions. A nearly hemispherical plano-concave resonator led at 937.3 nm to a maximum output power of 4.1 W for an incident pump power of 21.7 W, thus corresponding to a slope efficiency of about 23.5%. Laser operation was also obtained for the first time around 933.6 nm by using a glass etalon for frequency selection with a maximum output power of 2.3 W and a slope efficiency of 16% with respect to the incident pump power. Dual-wavelength operation (around 933.6 and 937.3 nm), which offers a potential source to generate THz radiation, is also reported. B. Xu · P. Camy ( ) · J.L. Doualan · A. Braud · R. Moncorgé Centre de Recherche sur les Ions, les Matériaux et la Photonique
Journal of the Optical Society of America B, 2003
Diode-pumped laser action at 1.34 m from the Nd 3ϩ :Ca 3 Ga 2 Ge 3 O 12 system is demonstrated and the physical parameters of relevance in laser dynamics reported. The pump-to-infrared conversion efficiency has been investigated as a function of both Nd 3ϩ concentration and output mirror transmittance. From the analysis of laser curves it has been demonstrated that the low laser efficiencies arise from the inhomogeneous line broadening of emission bands induced by multicenter distribution. This analysis has also been employed to determine the ratio between inhomogeneous and homogeneous line broadening (⌬ inh /⌬ h Ϸ 2.5), the result being in good agreement with that obtained from spectroscopy. Other mechanisms that could affect the extraction efficiency, such as excited-state absorption and energy-transfer upconversion, have also been evaluated, the results indicating that their influence in laser dynamics is negligible. Finally, we also report on the influence of multicenter distribution on the spectral shape of the 1.34-m output laser radiation.
Journal of Alloys and Compounds, 2021
We report on the growth, structure refinement, optical spectroscopy, continuous wave and femtosecond mode-locked laser operation of a Tm 3þ ,Ho 3þ-codoped disordered calcium niobium gallium garnet (CNGG) crystal. The 2.64 at.% Tm, 0.55 at.% Ho:CNGG is grown by the Czochralski method. Its cubic structure, sp. gr. Ia3d-O 10 h , a ¼ 12.4952(1) Å, is refined by the Rietveld method revealing a random distribution of Ga 3þ and Nb 5þ cations over octahedral and tetrahedral sites. The Ho 3þ transition probabilities are determined within the Judd-Ofelt theory accounting for an intermediate configuration interaction (ICI). For the 5 I 7 / 5 I 8 Ho 3þ transition, the maximum stimulated-emission cross-section s SE is 0.47 Â 10 À20 cm 2 at 2080.7 nm. The gain bandwidth of Tm,Ho:CNGG at~2 mm is > 150 nm and the thermal equilibrium decay time-6.80 ms. The Tm 3þ 4 Ho 3þ energy transfer parameters are determined. A diode-pumped Tm,Ho:CNGG microchip laser generated 413 mW at 2088.4 nm with a slope efficiency of 15.9%. A continuous wavelength tuning between 1940.3 and 2144.6 nm is demonstrated. Ultrashort pulses as short as 73 fs are achieved at 2061 nm from a Tm,Ho:CNGG laser mode-locked by a GaSb semiconductor saturable absorber mirror at a repetition rate of 89.3 MHz.
Diode pumped Nd:GSAG and Nd:YGG laser at 942 and 935nm
Optics Communications, 2007
Two new Nd 3+ doped crystals show laser activity between the 4 F 3/2 and 4 I 9/2 levels. Diode pumped emission of Nd:GSAG at 942 nm wavelength with 950 mW output power and 14% optical to optical efficiency as well as laser emission of Nd:YGG at 935 nm with 700 mW output power and 11% efficiency have been obtained. These wavelengths are useful for water vapour absorption measurements.
Diode-pumped actively Q-switched Nd:GGG laser operating at 938nm
Optics & Laser Technology, 2012
The stimulated emission cross-section of Nd:GGG crystal in 938 nm transition was measured by the amplifier approach. It is 2.3 Â 10 À 20 cm 2. A quasi-continuous-wave diode pumped, actively Q-switched Nd:GGG laser operating at 938 nm was demonstrated. Pumped by laser diodes with 900 W peak power and 300 ms pulse duration, it generated 168 mJ energy in long pulse mode. The slope efficiency was 36%. Q-switched by a KDnP Pockels cell, 41 mJ output pulse energy was obtained. The pulse duration and peak power were 120 ns and 340 kW, respectively. The optical to optical efficiency was 7%.
Optical properties and lasing of Nd:SrGdGa_3O_7
Journal of the Optical Society of America B, 1991
Absorption and emission cross sections for the 4I92 'F 312 transition in Nd:SrGdGa 3 O, have been measured as a function of temperature. A fluorescence branching ratio of 0.42 for this transition was calculated from a Judd-Ofelt analysis. Diode-pumped lasing was demonstrated at 0.911 ,um at reduced temperature and 1.06 ,um at room temperature.