Accession Number:

ADA002309

Title:

Photochemical Studies on Organic Lasers.

Descriptive Note:

Final rept. 1 Feb 73-31 Jan 74,

Corporate Author:

IBM THOMAS J WATSON RESEARCH CENTER YORKTOWN HEIGHTS N Y

Personal Author(s):

• Srinivasan,R.
• von Gutfeld,R. J.
• Angadiyavar,C. S.
• Tynan,E. E.

Report Date:

1974-06-01

Pagination or Media Count:

26.0

Abstract:

The fluorescence emission from alcoholic solutions of 7-monoalkyl-amino-4-methyl coumarins shifts from blue to blue-green on the addition of acid. Fluorescence and excitation spectra measured, and lasing species are discussed. New laser dyes based on the coumarin skeleton have been synthesized by varying the substituent groups at the 3- and 7-positions. 7-Amino-coumarins which were partially or totally alkylated were efficient lasers. The presence of a benzthiazole group at the 3- position shifted the laser emission to the green region. New laser dyes of the pyridine class were also synthesized. These were effective in the violet region of the spectrum.

Descriptors:

• *FLUORESCENCE
• *COUMARINS
• *DYE LASERS
• *PYRIDINES
• EXCITATION
• SYNTHESIS(CHEMISTRY)
• EMISSION SPECTRA
• MOLECULAR STRUCTURE
• DYES
• DIMERS

Subject Categories:

• Lasers and Masers
• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE