principles of operation
TITLE: laser (instrument)SECTION:
Types of lasers
A few other types of lasers are used in research. In dye lasers the laser medium is a liquid containing organic dye molecules that can emit light over a range of wavelengths; adjusting the laser cavity changes, or tunes, the output wavelength. Chemical lasers are gas lasers in which a chemical reaction generates the excited molecules that produce stimulated emission. In free-electron lasers...
TITLE: spectroscopy (science)SECTION:
...certain limited types of spectroscopic studies, a high-intensity tunable narrow-band source is needed for conventional high-resolution spectroscopic studies. This type of source is provided by the dye laser, in which laser emissions arise from the decay of dye molecules that have been excited into a multitude of closely spaced rovibronic (rotational-vibrational-electronic) levels by the...