Comparative gain measurements for twelve organic laser dye solutions

We have operated a dye laser over a broad wavelength range (593.8–667.0 nm) by shifting the dye emission profile with incremental changes of solvent composition. This was accomplished with the laser operating continuously, and only minor adjustment of the laser optics was required. Solvent tuning was facilitated by the critical dependence of the optimum laser wavelength on concentration of the second solvent. Using the known solvent-sensitive laser dye 9-diethylaminobenzo[a]phenoxaz-5-one (DBP), 87% of the tuning range from pure xylenes to pure methanol was covered by cumulative addition of 24 vol. % methanol to the starting xylenes solution. The optimum dye concentration was found to be independent of solvent composition, so that maximum laser power could be maintained by mixing equimolar dye solutions in the two solvents. These results establish the practicality of solvent-tuning as a method of conducting laser experiments over a broad wavelength range.

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Photo-stability of laser dye solutions under Copper-vapour-laser excitation

Applied Physics B ◽

10.1007/s003400100490 ◽

2001 ◽

Vol 72 (5) ◽

pp. 617-621 ◽

Cited By ~ 9

Author(s):

S. Sinha ◽

A.K. Ray ◽

S. Kundu ◽

S. Sasikumar ◽

S.K.S. Nair ◽

...

Keyword(s):

Laser Excitation ◽

Laser Dye ◽

Copper Vapour Laser ◽

Photo Stability ◽

Dye Solutions

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Solid cyclooctatetraene-based triplet quencher demonstrating excellent suppression of singlet–triplet annihilation in optical and electrical excitation

Nature Communications ◽

10.1038/s41467-020-19443-z ◽

2020 ◽

Vol 11 (1) ◽

Author(s):

Van T. N. Mai ◽

Viqar Ahmad ◽

Masashi Mamada ◽

Toshiya Fukunaga ◽

Atul Shukla ◽

...

Keyword(s):

Continuous Wave ◽

Fold Increase ◽

Complete Suppression ◽

Laser Dye ◽

Electrical Excitation ◽

Design And Synthesis ◽

Cw Operation ◽

Nanosecond Range ◽

Organic Laser ◽

Triplet Excitons

Abstract Triplet excitons have been identified as the major obstacle to the realisation of organic laser diodes, as accumulation of triplet excitons leads to significant losses under continuous wave (CW) operation and/or electrical excitation. Here, we report the design and synthesis of a solid-state organic triplet quencher, as well as in-depth studies of its dispersion into a solution processable bis-stilbene-based laser dye. By blending the laser dye with 20 wt% of the quencher, negligible effects on the ASE thresholds, but a complete suppression of singlet–triplet annihilation (STA) and a 20-fold increase in excited-state photostability of the laser dye under CW excitation, were achieved. We used small-area OLEDs (0.2 mm2) to demonstrate efficient STA suppression by the quencher in the nanosecond range, supported by simulations to provide insights into the observed STA quenching under electrical excitation. The results demonstrate excellent triplet quenching ability under both optical and electrical excitations in the nanosecond range, coupled with excellent solution processability.

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Gamma Ray Effect on the Properties of Coumarin C47 Laser Dye

Baghdad Science Journal ◽

10.21123/bsj.15.3.310-313 ◽

2018 ◽

Vol 15 (3) ◽

pp. 310-313

Author(s):

Baghdad Science Journal

Keyword(s):

Absorption Spectrum ◽

Gamma Ray ◽

Blue Shift ◽

Exposure Period ◽

Gamma Dose ◽

Red Shift ◽

Laser Dye ◽

60Co Source ◽

Before And After ◽

Dye Solutions

The research is concerned about studying the absorption spectrum of the solution coumarin dye C47. The chloroform solvent was used with C47 dye in three different concentrations 10-4, 10-5 and 10-6 M. The laser dye solution was prepared by dissolving the required amount of dye in chloroform alcohol, while studying absorption spectrum before and after irradiation with gamma ray by cobalt-60 source 60Co at exposure time, which are 0, 4, 6 and 18 hours with different absorbed doses 0, 136, 204 and 612 Gy. The results show that red shift in the absorption spectrum was increased by increasing the concentration of laser dye solutions , while the increase of gamma dose led to increase the red shift after irradiation, as the exposure period and irradiation dose increased from gamma ray at 60Co source. Furthermore, the decrease in the concentrations of laser dye solutions shifts the absorption spectrum peak towards the short wavelength blue shift.

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