Anisotropy in the laser performance of NdP5O14

Abstract

We report, for the first time in a biaxial laser material, on the distribution of fluorescence cross sections in the index ellipsoid. The largest effective fluorescence cross section of pure NdP5O14 at room temperature (2.0±0.1) ×10−19 cm2 for light at 1.0512 μ wavelength polarized parallel to the 2 axis which coincides with the crystallographic b axis. We predict from the cross sections the cw thresholds and polarizations of the four highest-gain laser transitions and verify the results quantitatively by operating one crystal in all major polarizations. We measured the major phase and group refractive indices and the thermal expansion coefficient of the optical lengths near 1.05 μ wavelength. We also discuss the twin domains which have different orientations of the crystallographic and optic axes. In imperfect crystals they can easily be created by thermal stresses which can drastically increase the laser threshold.

Growth and spectroscopic properties of Nd3+: BaLaLiWO6 crystal

“…There are three emission bands corresponding to the 4 F 3/2 -4 I j transitions, which are observed in the 850-987, 1028-1173 and 1310-1421 nm ranges with peaks at 911, 1074 and 1351 nm, respectively. The emission cross-section, s em , at 1074 nm was determined from the following formula [19]:…”

Growth and spectral properties of Nd3+-doped Li3Ba2Ln3(MoO4) (Ln=La, Gd) crystals

“…In the fluorescence spectra three emission bands corresponding to the 4 F 3/2 → 4 I 9/2 , 4 I 11/2 and 4 I 13/2 transitions are observed at 860-940, 1036-1120, 1320-1405 nm. The emission cross-section em of both crystals can be calculated using the following formula [34]:…”

Growth of Nd3+ doped LiNbO3 crystals using Bridgman method and its spectral properties

“…The calculated phenomenological intensity parameters (Ω λ ), radiative transition rates (Α r ), total radiative lifetimes (T r ), and the branching ratios (β) are listed in table 2. For lines with Lorentz line shape, the stimulated emission cross-section, σ em , for the transition 3 F 3/2 → 4 I J (J = 9/2, 11/2, 13/2, 15/2) was estimated using the formula (Huber et al 1975) …”