Scintillator and dye lasers in the range 350 to 600 nm pumped by a 200 kW nitrogen laser

Abstract

A comparative study is presented of the laser output characteristics of ten fluorescent solutes in different solvents, pumped with the 337.1 nm radiation from a 200 kW nitrogen laser. With both 2 mm and 10 mm dye path lengths, peak output powers of several kilowatts were obtained at wavelengths ranging from 350 to 600 nm and with pulse-widths as short as 0.5 nsec FWH M. The dependence of the laser characteristics on such variables as the concentration and the transmission of the solutions and the way of focusing the exciting radiation into the dye cavity were investigated. Three dye cells were made to lase in cascade, one of the stages with an efficiency of 50%.

Spectroscopy of Amplified Spontaneous Emission Laser Spikes in Phenyloxazoles. Prototype Classes

“…This paper presents a fuller account of our previous communication . Research on the general lasing action of these phenyloxazoles (Table ) has been reported previously − in qualitative surveys.…”

Lasing action in a family of perylene derivatives: singlet absorption and emission spectra, triplet absorption and oxygen quenching constants, and molecular mechanics and semiempirical molecular orbital calculations

“…14 The first high efficiency lasing of a perylene derivative, the bis((2,6-dimethylphenyl)imide) (BXP, lb), was reported by Sadrai and Bird.15 Perylene itself produced only short lasing pulses of low efficiency because of the larger quantum yield of triplet formation and the overlap of T, -*• T" absorption with the fluorescence band. 16 However, perylene has been used successfully as a singlet sensitizer by Pavlopoulos to enhance the lasing output of a longer wavelength rhodamine dye.17 Weak lasing of BBPI has been observed recently,18 and efficient lasing has been reported for BXP in "sol-gel" media by Reisfeld et al 19 The properties of a good laser dye are strong absorption, high quantum yield of fluorescence, photochemical stability under intense excitation, a region of strong luminescence well out of the absorption wing, very low quantum yield of triplet states, and preferably minimal overlap between both the regions of strong 0022-3654/92/2096-7988$03.00/0 © 1992 American Chemical Society T, -T" and Si -*• S" pumping absorption and the S, -S0 laser dye emission. The O' -0" vibronic fluorescence band cannot participate in laser action, since the ground and excited states cannot easily be inverted for this transition; thus one seeks to shift fluorescence intensity away from this band, as we have done earlier with a family of rhodol or rhodamone dyes.…”

Intersystem-crossing and excited-state absorption in eosin Y solutions determined by picosecond double pulse transient absorption measurements

“…It is applied as a photo-oxidation sensitizer due to its high efficiency of singlet oxygen generation [3][4][5][6]. Laser action of eosin Y was achieved in various solvents [7][8][9][10][11][12]. The dye was applied to nonlinear optical processes like low power phase conjugation [13][14][15] and spatial light modulation [16].…”