New disordered Ca₂Ga₂SiO₇:Nd³⁺crystal for high-power solid-state lasers

Abstract

A description of nonstationary simple waves and Riemann invariants in a relativistically hot electron-positron magnetoplasma is presented. It is noted that at relativistic temperatures the photon energy far exceeds the internal kinetic energy and that the particle effective mass depends strongly on the temperature. Starting from a set of relativistic radiation magnetohydrodynamic equations, the nonlinear characteristics and velocities of simple waves are obtained. The equations are further employed to examine the Riemann invariants in the presence of isentropic flow. It is found that at ultra-relativistic temperatures the photon pressure and the relativistic mass variation play a very important role.

Many-phonon stimulated Raman scattering and related cascaded and cross-cascaded χ(3)-nonlinear optical effects in melilite-type crystal Ca2ZnSi2O7

“…[2][3][4][5][6][7][8]). Special attention in recent years was devoted to studies of various manifestation of cascaded χ (3) ↔ χ (3) and χ (3) ↔ χ (2) interactions in these crystals and to elici-Crystal SE channels of Nd 3+ ions Observed χ (3) -and χ (2) -nonlinear laser effects SRS-promoting vibration modes, cm ≈ 667, ≈ 500 4 F 3/2 → 4 I 13/2 [3,15] [present work] Sr2MgGe2O7 SRS, SHG, THG, SFG, self-SFG(FD) h) , ≈ 779 [12] self-SFG(FD,SRS) i) , St-ASt comb [12] Sr 2 ZnGe 2 O 7 SRS, SHG, THG, SFG, self-SFG(FD), ≈778 [11] self-SFG(FD,SRS), St-ASt comb [11] Ba 2 MgGe 2 O 7 4 F 3/2 → 4 I 11/2 [1,5] SRS, SHG, THG, SFG, "Cherenkov-type" SHG j) , 771.5 [9] self-FD(SRS) k) , self-SRS(FD) l) , self-SRS(SFG) m) , self-SFG(FD,SRS) n) , St-ASt comb [9] Ba2ZnGe2O7 4 F 3/2 → 4 I 11/2 [2,5] SRS, SHG, THG, SFG, self-FD(SRS), self-SRS(FD), ≈ 770, ≈ 257 [12] self-SRS(SRS), St-ASt comb [12] Note: only references from peer-reviewed journals are included. a) Also known as mineral hardystonite (see, e.g.…”

Cascaded nonlinear-laser interactions in melilite-type crystals of Sr2MgGe2O7 and Ba2ZnGe2O7

“…Since 1968 [1], crystals with non-centrosymmetric tetragonal melilite-type structure are in the focus of attention as laser host crystals, with particular interest to those that show a disordered crystal field for trivalent lanthanide ions (Ln 3+ ) [2][3][4][5][6][7][8][9][10][11][12][13] (see also [14][15][16][17]). Doped with Nd 3+ , crystals of the melilite family, e.g.…”

“…Doped with Nd 3+ , crystals of the melilite family, e.g. Ca 2 Ga 2 SiO 7 [8,9], Ba 2 MgGe 2 O 7 [1], and Ba 2 ZnGe 2 O 7 [2] (see Table 1), were successfully used in high-power lasers, both, with Xe-flashlamp pumping and with laser-diode pumping. They served also as selective laser excitation sources, e.g.…”