Stimulated Emission of Ferroelectric Pb5Ge3O11:Nd3+, K+

Abstract

Investigations of spectroscopic properties and stimulated emission (SE) of rareearth ions (TR started in /1, 2/. Particularly, they show the possibility of SE excitation in the visible region of the spectrum, using activated insulators by up-conversion /3/.

Today and tomorrow of laser-crystal physics

“…Laser action can also be excited at this channel using the direct cascade SE 3P, --f ' G , + 3F, channels. New properties of Pr3+ ions have been discovered in YAlO, crystals: at 300 K with Xe flashlamp excitation, generation was obtained at 0.996 pm [209]. In [210] the possibility of exciting UV generation from the 'So level of Pr3+ ion fluoride hosts is analyzed.…”

“…For instance, the Eu3 + ion is considered as a sensitizer in [211]. To improve generation characteristics of praseodymium lasers, in [212] a by-pass "external" sensitizer (organic Coumarin-102 dye in ethanol) is proposed which transforms the UV radiation of Xe flashlamps to an emission corresponding to the active absorption bands of Pr3+ ions in crystals. New possibilities of increasing Pr3+ ion SE-excitation efficiency across the transitions starting with the 'Po state are analyzed in [213] using the "lifting ground-state'' method.…”

“…The authors of [214] have demonstrated the possible use of a "photon-avalanche'' phenomenon to obtain SE generation in the LaC1, : Pr3+ crystal. In the last few years an output energy of visible room-temperature praseodymium crystalline lasers with usual Xe flashlamp pumping amounting to 500 mJ has been achieved [212,215 to 2171. In [218,2191 CW laser action has been obtained at different generating channels in YAlO, : Pr3+ and LiGdF,: Pr3+ crystals with laser excitation.…”

Anomalous d.c. conductance in Nd+3-doped ferroelectric lead germanate single crystal

“…It is well known that tailor-made additives (Devo~ak and Gloger 1966;Yanorskil 1980;Dergunova et al 1988) can be planned to modify the ferroelectric behaviour. Nd +3 doping in lead germanate also provides laser active host material (Kaminskii et al 1983). Information on conductivity behaviour is a prerequisite for ferroelectric materials to be used as ferroelectric solid state devices.…”

LiYF4: Pr3+ laser at 639.5 nm with 30 J flashlamp pumping and 87 mJ output energy

“…In particular, low-threshold SE in the visible and near-1R ranges was obtained at room temperature and with Xe-flashlamp pumping (see, e.g. [4, 6]), and new praseodymium laser operating schemes were developed [7,8].…”