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Three typical emission spectra from ≈ 14-μm-diameter ethanol/R6G droplets pumped by a cw Ar+ laser at 514.5 nm. Laser pump intensity is increased by ≈ 1.5× for each spectrum from bottom to top.
(a) Ethanol/R6G droplet emission spectra and computed cavity-mode positions for the low wave-number half of the total R6G emission region. Two experimental spectra shown in the upper part of the figure were taken under identical conditions except that the excitation intensity was changed by ≈ 1.5.× Calculated cavity-mode positions are indicated by arrows in the horizontal plane of the three-dimensional plot and then projected by broken lines into the vertical plane of the spectra for comparison, (b) The same emission spectra shown in (a) have been continued here into a higher-wave-number region. Computed cavity-mode positions for this region are shown in a similar way with arrows pointing up (down) indicating TE (TM) modes.