LIQUID-LASER CAVITIES AND WAVE-GUIDES - III - RADIATION COUPLING-OUT AND FLUORESCENCE UNDER UNIFORM EXCITATION - EVAPOLATORS

An investigation was made of laser radiation coupling-out from totally reflecting closed liquid cavities by local frustration of total inter nal reflection with the aid of internal water spheres and external con tact with a substrate or a prism. A rotating drop of ethanol containin g rhodamine B in an envelope of liquid C8F18 generated laser radiation with a divergence of several angular degrees and an efficiency up to 5% relative to the excitation energy. A transparent drop of ethanol wi th rhodamine B, suspended in air, and subjected to uniform pumping was used to determine the depth of the zone in which lasing took place in a liquid cavity. An increase in the integral (during the pump time) f luorescence energy from a selected internal part of this drop, which d id not participate in lasing, on increase in the excitation flux was i n agreement with the expectations and it began to fall at high pump in tensities. Characteristics of oscillations in immiscible liquids which evaporated in an evaporator-oscillator ('evapolator') were discussed.