Concentration and Dye Length Dependence of Organic Dye Laser Spectra

Abstract

Experimental data comparing peak emission wavelength with organic dye laser cell length are presented. These data and knowledge of the variation of peak emission wavelength with organic dye concentration make reasonable the hypothesis that the observed effects are caused by self-absorption. A simple theory is developed on this hypothesis and the results of numerical calculations compared with the experimental data. Good agreement is obtained, but some departures from agreement suggest improvement may be expected from a time-dependent theory.

Characteristics of a broadband dye laser using Pyrromethene and Rhodamine dyes

“…This is due to the singlet-singlet re-absorption (self absorption and re-emission) process as discussed in Ref. [32] and [33]. This process is a result of the frequency overlap of the absorption and emission bands of the dye.…”

Dye laser intra-cavity enhanced absorption measured using a photodiode array direct reading spectrometer

“…The dyes typically broadband lase over about 100 to 200 A. The position of the spectrum often can be shifted (tuned) 200 A or more by changing such parameters such as dye concentration, cavity length (9,10), and solution pH. The rhodamine 6G dye laser spectrum (yellow) was centered on the europium and neodymium bands using concentration and cavity length tuning.…”