(Color online) (a) Absorption and photoluminescence properties of the Nd:PLZT sample; (b) schematic diagram of the end-pumping geometry in optical amplification both for continuous wave and pulse mode pumping; typical dynamics of the gain measurement recorded with a HP Infinium digital oscilloscope as the pumping power was fixed at 5.0 W; (c) the crossing angle was set at 19.7° under cw pumping case; and (d) the crossing angle at 155° under pulse pumping.
(Color online) (a) Schematic diagram of a unit cell of perovskite structure to which PLZT belongs; (b) a AFM micrograph of the surface of a 20 μm thick PLZT film made by metal-organic chemical liquid deposition (MOCLD); (c) schematic of a polycrystalline ceramic with vacancies and defects within and on boundaries of grains that trap electrons.
Schematic diagram of energy levels that illustrates the continuous trap distribution (Refs. 16–18): ST-shallow trap level; TAT-thermally active level at energy Ea; TDT-thermally disconnected traps; RC-recombination center.
(Color online) (a) A typical photochromic pattern written on a 1.0 mol% Nd3+:PLZT sample after exposure to a royal blue LED light (centered at 455 nm, 300 mW) for 1 min; (b) broadband absorption originated from photochromism in the 1.0 mol% Nd:PLZT samples: circles, before royal blue light illumination; stars, after 5 s; black line with solid squares, after 10 min.
(Color online) (a) Thermal bleaching time of darkening pattern in a Nd3+:PLZT ceramic slug vs surrounding temperature in darkness; the left panel in the inset was the metal mask, and the right panel the darkening pattern formed on the slug after exposure to a royal blue LED for ten minutes; (b) a typical photo-induced bleaching dynamic of photochromic effect from the HP Infinium digital oscilloscope.
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