Particulars of Hydrothermal Synthesis of Nanosize Powder (Zr1–xYx)Oy

Development of Saturable Absorbers for Laser Passive Q‐Switching near 1.5 μm Based on Transparent Ceramic Co2+:MgAl2O4

“…The disk-shaped green parts (30 mm internal metal die diameter) were consolidated by a two-stage pressing operation: after shaping by a mild unidirectional pressing at 10 MPa the disks were inserted into evacuated plastic bags, and subjected to cold isostatic pressing (CIP) by consecutive 10 min dwells at 80, 140, and 200 MPa (maximal pressure). Sintering the green specimens in open air at high temperatures (t S°) , dependent on the powder type, was used to achieve a density of at least~97% of the theoretical material density (3. The ZnAl 2 O 4 glass-ceramic used as reference, was prepared using the technology described by M. Sirota et al; 26 Co 2+ concentration was of 0.2 at.%.…”

“…A part of the reduction in the ground-states density may be attributed to a small thermal depletion of the ground state. Cross sections and saturation values, for single crystals (including spinel) and glass-ceramics are given in the literature, e.g.,: [2,8,[15][16][17]26]. Some typical values are collected in Table II.…”

“…All the relevant spectral features of Co 2+ :MgAl 2 O 4 (ceramic) are compared to those of a reference sample of a glass-ceramic that we have previously developed. 26 This host was selected as reference because it can already be produced industrially and is likely to constitute-in the near future-the main new competitor for ceramic host based switches. The Co 2+ cations in the reference glass-ceramic are embedded in the lattice of nano-gahnite ZnAl 2 27 The latter site exhibits a sixfold coordination (six closest oxygen-neighboring atoms), and thus are often addressed to as the "octahedral site".…”