Substituted and unsubstituted ring-bridged para-oligophenylene UV laser dyes
First Claim
1. A laser dye capable of stimulated coherent emission in the range below 400 nm comprising ring-bridged p-oligophenylenes having at least 4 and no more than 8 phenyl groups, and having at least one bridge between two adjacent phenyl groups but no more than one bridge between any two adjacent phenyl groups.
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Abstract
The present invention relates to laser dyes having improved characteristics comprising substituted and unsubstituted ring-bridged p-oligophenylenes having at least four and no more than 8 phenyl groups. These improved laser dyes can be excited by pump lasers and are capable of producing stimulated coherent emission in the near ultraviolet range, particularly in the range below 400 nm, and have improved photostability. The p-oligophenylenes used according to the invention have the following characteristics:
(a) the number of bridges is a number from 1 to 7 but only one bridge exists between two adjacent phenylene groups;
(b) each bridge in the O,O'"'"'-cis position engages two adjacent phenylene groups;
(c) the bridges represent the same and/or different species from a defined group; and
(d) the phenylene rings may either be unsubstituted, except for the bridges, or one or several phenylene rings in the molecule, independent of whether they are bridged or not, may have one or two radicals R3 per phenylene ring, with different phenylene rings having the same or different radicals R3.
19 Citations
18 Claims
- 1. A laser dye capable of stimulated coherent emission in the range below 400 nm comprising ring-bridged p-oligophenylenes having at least 4 and no more than 8 phenyl groups, and having at least one bridge between two adjacent phenyl groups but no more than one bridge between any two adjacent phenyl groups.
- 6. In a dye laser the improvement comprising a laser dye capable of stimulated coherent emission in the range below 400 nm which comprises at least one ring-bridged p-oligophenylene having from 4 to 8 phenyl groups, and having one bridge between any two adjacent phenyl groups.
- 11. In a method of lasing, the improvement comprising a laser dye capable of stimulated coherent emission in the range below 400 nm which comprises at least one ring-bridged p-oligophenylene having from four to eight phenyl groups, and having one bridge between any two adjacent phenyl groups.
Specification