Thin-film waveguide evanescent dye laser and its gain measurement

Abstract
Superradiant waveguide evanescent‐type dye lasers are realized by polyurethane top layers containing Rhodamine 6G and Rhodamine B respectively on single‐mode glass waveguides with N2 uv laser pumping. A new determination method of gain factor (negative absorption coefficient) by active guide length dependence of a triangle shape top layer is proposed.

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