Tunable Ultraviolet Vertically-emitting Organic Laser

TL;DR

This paper reports a compact, tunable ultraviolet organic laser with intracavity frequency doubling, achieving 309-322 nm emission with high spectral purity and 2% efficiency, suitable for portable spectroscopic uses.

Contribution

It introduces a novel solid-state organic thin-film laser with intracavity frequency doubling that is tunable in the ultraviolet range, offering a low-cost portable alternative.

Findings

Tunable UV emission from 309 to 322 nm achieved.

Laser efficiency of 2% with 1 μJ output at 315 nm.

Spectrally narrow output (<0.5 nm FWHM).

Abstract

A solid-state organic thin-film laser with intracavity frequency doubling is reported. Tunable ultraviolet emission from 309 to 322 nm is achieved from a vertical external cavity surface-emitting organic laser, with 2 % efficiency (1 $\mu$J at 315 nm). The laser comprises a polymethyl(methacrylate) layer doped with Rhodamine 640, spun-cast onto a plane mirror, a remote concave mirror, a nonlinear crystal and a dichroic separator. The output is spectrally narrow (<0.5 nm FWHM) and tunable through phase-matching selection of the fundamental radiation lasing modes. These results highlight a low-cost and portable alternative to tunable UV laser sources, useful for spectroscopic applications.