US4714838A
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Second harmonic generation with N,N'-substituted barbituric acids
Assignee: 3M Co
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Filing: 1986-10-31
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Granted: 1987-12-22
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Expires: 2006-10-31
Abstract
Abstract Devices for and method of generating coherent second harmonic light radiation. The devices comprise a laser source of coherent light radiation at a fixed fundamental frequency, a crystalline N,N'-substituted barbituric acid that crystallizes in a non-centrosymmetric configuration, means for directing the output radiation of the laser onto the N,N'-substituted barbituric acid, and output means for utilizing the second harmonic frequency.
Inventors
- 👤 Roberta E. Harelstad
- 👤 John Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:56
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/355; G02F1/361; G02F1/3611; G02F1/3612; C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/46; C07D239/60; C07D239/62
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
72 words
A second harmonic generator comprising a laser source of coherent light radiation at a fixed fundamental frequency, an organic molecular crystalline compound, means for directing the output radiation of the laser onto the compound, and output means for utilizing the second harmonic frequency, said compound being a N,N'-substituted barbituric acid which crystallizes in a non-centrosymmetric configuration, said compound being transparent to radiation at said fixed fundamental frequency and said second harmonic frequency.
Claim 2
Dependent Claim
72 words
A second harmonic generator comprising a laser source of coherent light radiation at a fixed fundamental frequency, an organic molecular crystalline compound, means for directing the output radiation of the laser onto the compound, and output means for utilizing the second harmonic frequency, said compound being a N,N'-substituted barbituric acid which crystallizes in a non-centrosymmetric configuration, said compound being transparent to radiation at said fixed fundamental frequency and said second harmonic frequency.
Claim 3
Dependent Claim
89 words
The second harmonic generator of claim 1 wherein said organic molecular crystalline compound is represented by the formula: ##STR3## where R 1 and R 2 independently represent an alkyl group, an alkaryl group, an aralkyl group, or a heteroaromatic group, and R 3 and R 4 independently represent an alkyl group, an alkaryl group, an aralkyl group, a heteroaromatic group, an aromatic group, hydrogen, or R 3 and R 4 together, along with the carbon atom in the 5-position, form a ring containing from 3 to 7 ring members.
Claim 4
Dependent Claim
21 words
The second harmonic generator of claim 2 wherein R 1 represents an alkyl group having from 1 to 18 carbon atoms.
Claim 5
Dependent Claim
21 words
The second harmonic generator of claim 2 wherein R 2 represents an alkyl group having from 1 to 18 carbon atoms.
Claim 6
Dependent Claim
29 words
The second harmonic generator of claim 2 wherein R 1 represents a methyl group or an ethyl group and R 2 represents a methyl group or an ethyl group.
Claim 7
Dependent Claim
50 words
The second harmonic generator of claim 2 wherein at least one of R 1 , R 2 , R 3 , or R 4 is alkyl group having at least one substituent thereon, wherein said at least one substituent has a sigma constant of from about 0.062 to about 0.778.
Claim 8
Dependent Claim
41 words
The second harmonic generator of claim 2 wherein the ring formed by R 3 , R 4 , and the carbon atom in the 5-position contains one ring member selected from the group of atoms consisting of oxygen, nitrogen, and sulfur.
Claim 9
Dependent Claim
14 words
The second harmonic generator of claim 1 wherein the laser is a Nd-YAG laser.
Claim 10
Dependent Claim
13 words
The second harmonic generator of claim 1 wherein said compound is a solid.
Claim 11
Dependent Claim
62 words
A process for converting a fixed fundamental frequency of coherent laser light into a second harmonic frequency which comprises passing said laser light through a nonlinear optical element comprising an organic molecular crystalline compound, said compound being a N,N'-substituted barbituric acid which crystallizes in a non-centrosymmetric configuration, said compound being transparent to said fixed fundamental frequency and to said second harmonic frequency.
Claim 12
Dependent Claim
62 words
A process for converting a fixed fundamental frequency of coherent laser light into a second harmonic frequency which comprises passing said laser light through a nonlinear optical element comprising an organic molecular crystalline compound, said compound being a N,N'-substituted barbituric acid which crystallizes in a non-centrosymmetric configuration, said compound being transparent to said fixed fundamental frequency and to said second harmonic frequency.
Claim 13
Dependent Claim
87 words
The process of claim 9 wherein said organic molecular crystalline compound is represented by the formula: ##STR4## where R 1 and R 2 independently represent an alkyl group, an alkaryl group, an aralkyl group, or a heteroaromatic group, and R 3 and R 4 independently represent an alkyl group, an alkaryl group, an aralkyl group, a heteroaromatic group, an aromatic group, hydrogen, or R 3 and R 4 together, along with the carbon atom in the 5-position, form a ring containing from 3 to 7 ring members.
Claim 14
Dependent Claim
48 words
The process of claim 11 wherein at least one of R 1 , R 2 , R 3 , or R 4 is alkyl group having at least one substituent thereon, wherein said at least one substituent has a sigma constant of from about 0.062 to about 0.778.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-21 | 1991-06-22 | 1991-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-21 | 1995-06-22 | 1995-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-21 | 1999-06-22 | 1999-12-22 | $7700.00 | Window Closed / Lapsed |