An emulsion dye laser

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Abstract
A laser dye which is insoluble in water has been dissolved in hexane and emulsified in a water matrix. When pumped with a nitrogen laser, this mixture was observed to lase. The emulsion is superior to a simple hexane solution because the excellent thermo‐optical properties of the water matrix help prevent refractive‐index gradients from degrading laser performance. This is a useful characteristic for flash‐pumped dye lasers, laser‐pumped dye lasers, and liquid filters. Another type of solvent system, a critical solution, is also discussed. For certain dyes, a critical solution has even better thermo‐optical properties because of its ability to absorb heat as it undergoes a liquid‐liquid phase transition.

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