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The polarized absorption, emission spectra, and the fluorescence decay curve of Er3+ ions in the anisotropic Ca3(BO3)2 crystal were investigated at room temperature. The experimental oscillator strengths for the transitions from the ground state to excited states were compared with the theoretical electric dipole oscillator strengths calculated from the Judd-Ofelt [Phys. Rev. 127, 750 (1962); J. Chem. Phys. 37, 511 (1962)] theory. The emission cross sections and gain cross sections of the π and σ spectra were determined for the 4H13/2→4H15/2 transition of special interest for laser application. [ABSTRACT FROM AUTHOR]

We have demonstrated two self-frequency conversions from the bifunctional laser and optical nonlinear GdAl3(BO3)4:Nd3+ crystal. For the first one, the laser operated in a dual-wavelength mode in the 4F3/2→4I11/2 (at 1062 nm) and 4F3/2→4I13/2 (at 1338 nm) channels, under a fixed wavelength pumping (at 747.7 nm) and with a fixed crystal orientation (28.5°). Then the self-sum frequency mixing 1/1062+1/1338→1/592 process occurred, leading to a weak yellow beam at 592 nm. In the second self-frequency conversion, the Nd3+:GdAl3(BO3)4 laser operated in a single wavelength mode at 1062 nm. Then the self-difference frequency mixing process 1/λP-1/1062=1/λI occurred at a 29.9° phase matching angle. The idler wavelength λI was tunable in the 2450–2600 nm range, due to the tunability of the λP pump wavelength. The highest yield was 0.12%. New Sellmeier formulas valid at least up to 2600 nm have been established. [ABSTRACT FROM AUTHOR]

The spectroscopic properties of GdAl3(BO3)4:Tm3+ single crystal for the Tm3+ transition near 1.9 μm are presented. The absorption cross section, the emission cross section, and the potential laser gain near 1.9 μm are investigated for both σ and π polarizations. The broad absorption band at about 797 nm and high value of the above cross section are promising features for obtaining a laser diode pumped Tm3+ laser. The maximum emission cross sections are 1.29×10-20 and 6.60×10-20 cm2 at 1.85 μm for the σ and π polarizations, respectively. The potential laser gain curves indicate that more than 200 nm tunability range is expected for this material. [ABSTRACT FROM AUTHOR]

We combine inside a single noncentrosymmetric laser crystal, GdAl[sub 3](BO[sub 3])[sub 4]:Nd[sup 3+], a stimulated emission and two second-order nonlinearities in cascade. The first one self-doubles the 1062.8 nm Nd[sup 3+] laser emission corresponding to the [sup 4]F[sub 3/2]→[sup 4]I[sub 11/2] channel, despite the fact that it is not phase-matched. The second one can be phase-matched or not and mixes the laser wave and its second harmonic (SH) in order to produce the third harmonic (TH) at 354.3 nm. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Demonstrates the retraces of phase-matching angles and non-critical phase-matching temperatures for second harmonic generation in lithium triborate (LBO) crystals. Sensitivity of the crystal angle to the index of refraction; Determination of the Sellmeier's equation reliability; Suitability of LBO for doubling.

Observes the blue light second harmonic emission from an organic nonlinear optical crystal of 4-aminobenzophenone (ABP) pumped by a laser diode. Measurement of refractive indices and nonlinear optical coefficients; Transmittance spectra of ABP crystal; Estimation of second-harmonic generation and conversion efficiency of a laser diode.

Investigates the broadband optical parametric amplification (OPA) in a lithium triborate crystal. Generation of the picosecond laser pulse; Energy of the laser pulse train and duration; Spectral characteristics of OPA.

Reports the operation of the visible optical parameter oscillator using LiB[sub 3]O[sub 5] crystal as nonlinear element. Percentage of energy conversion efficiency of the visible signal wave; Generation of visible output energy; Range of continuous tuning.

Reports on the operation of an efficient visible and near-infrared optical parametric oscillator that uses Beta-BaB[sub 2]O[sub 4] as the nonlinear medium. Energy conversion efficiency; Pump depletion.

Reports on the detection of defects in bulk beta-barium metaborate (BBO) crystals by using an improved light scattering tomograph method. Observation of microdefects of small size that can be detected by ordinary optical methods; Use of a laser beam to detect dislocation lines decorated by impurity atoms.

We have demonstrated two self-frequency conversions from the bifunctional laser and optical nonlinear GdAl3(BO3)4:Nd3+ crystal. For the first one, the laser operated in a dual-wavelength mode in the 4F3/2→4I11/2 (at 1062 nm) and 4F3/2→4I13/2 (at 1338 nm) channels, under a fixed wavelength pumping (at 747.7 nm) and with a fixed crystal orientation (28.5°). Then the self-sum frequency mixing 1/1062+1/1338→1/592 process occurred, leading to a weak yellow beam at 592 nm. In the second self-frequency conversion, the Nd3+:GdAl3(BO3)4 laser operated in a single wavelength mode at 1062 nm. Then the self-difference frequency mixing process 1/λP-1/1062=1/λI occurred at a 29.9° phase matching angle. The idler wavelength λI was tunable in the 2450–2600 nm range, due to the tunability of the λP pump wavelength. The highest yield was 0.12%. New Sellmeier formulas valid at least up to 2600 nm have been established. [ABSTRACT FROM AUTHOR]