US4853937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser-active aqueous dispersion of a laser dye
Assignee: Karlsruher Institut für Technologie
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Filing: 1988-11-15
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Granted: 1989-08-01
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Expires: 2008-11-15
Abstract
Abstract A laser-active aqueous dispersion of a laser dye comprising microparticles containing a laser dye, with the microparticles being suspended in an aqueous liquid. The aqueous liquid has an index of refraction which is substantially equal to that of the microparticles.
Inventors
- 👤 Monika Rinke
- 👤 Hans Guesten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:43
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/14; H01S3/20; H01S3/213
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
49 words
A laser-active dispersion of a laser dye which can be excited to laser emission by a pumping laser, comprising: microparticles containing a laser dye, an aqueous liquid having a refractive index substantially the same as that of the microparticles, and wherein the microparticles are suspended in the aqueous liquid.
Claim 2
Dependent Claim
49 words
A laser-active dispersion of a laser dye which can be excited to laser emission by a pumping laser, comprising: microparticles containing a laser dye, an aqueous liquid having a refractive index substantially the same as that of the microparticles, and wherein the microparticles are suspended in the aqueous liquid.
Claim 3
Dependent Claim
18 words
A laser-active dispersion according to claim 1, wherein said microparticles comprise a transparent polymerized organic or inorganic compound.
Claim 4
Dependent Claim
22 words
A laser-active dispersion according to claim 2, wherein said microparticles comprise a polymethacrylate, a polyacrylate, a polysilane, a polycarbonate or a polystyrene.
Claim 5
Dependent Claim
32 words
A laser-active dispersion according to claim 2, wherein said microparticles comprise a polyacrylate or polymethacrylate fluorinated in the α-position, in the ester group or in both the α-position and the ester group.
Claim 6
Dependent Claim
14 words
A laser-active dispersion according to claim 1, wherein the aqueous liquid is pure water.
Claim 7
Dependent Claim
18 words
A laser-active dispersion according to claim 1, wherein the aqueous liquid comprises an immersion agent dissolved in water.
Claim 8
Dependent Claim
51 words
A laser-active dispersion according to claim 6, wherein the aqueous liquid containing the immersion agent water solution does not substantially absorb any light in the wavelength range of a pumping laser used to excite the laser dye or in the wavelength range of the laser beam emitted by the laser dye.
Claim 9
Dependent Claim
31 words
A laser-active dispersion according to claim 6, wherein the concentration of the immersion agent is adjusted so that the aqueous liquid has substantially the same index of refraction as the microparticles.
Claim 10
Dependent Claim
15 words
A laser-active dispersion according to claim 6, wherein the immersion agent is an inorganic salt.
Claim 11
Dependent Claim
17 words
A laser-active dispersion according to claim 6, wherein the immersion agent is ammonium chloride or ammonium sulfate.
Claim 12
Dependent Claim
32 words
A laser-active dispersion according to claim 6, wherein the immersion agent is at least one salt selected from the sulfate or chloride salts of the alkali metal or alkaline earth metal elements.
Claim 13
Dependent Claim
16 words
A laser-active dispersion according to claim 6, wherein the immersion agent comprises a water-soluble organic substance.
Claim 14
Dependent Claim
21 words
A laser-active dispersion according to claim 12, wherein said water-soluble organic substance is mono-ethylene glycol, glycerin, glucose or a mixture thereof.
Claim 15
Independent Claim
54 words
A method for producing laser light, which comprises exciting a laser-active aqueous dispersion of a laser dye by means of a pumping laser wherein said dispersion comprises microparticles containing a laser dye, and wherein said microparticles are suspended in an aqueous liquid having a refractive index substantially the same as that of said microparticles.
Claim 16
Independent Claim
54 words
A method for producing laser light, which comprises exciting a laser-active aqueous dispersion of a laser dye by means of a pumping laser wherein said dispersion comprises microparticles containing a laser dye, and wherein said microparticles are suspended in an aqueous liquid having a refractive index substantially the same as that of said microparticles.
Claim 17
Dependent Claim
22 words
A method for producing laser light as recited in claim 14, wherein said microparticles comprise a transparent polymerized organic or inorganic compound.
Claim 18
Dependent Claim
22 words
A method for producing laser light as recited in claim 14, wherein said aqueous liquid comprises an immersion agent dissolved in water.
Claim 19
Dependent Claim
29 words
A laser-active dispersion according to claim 8, wherein the aqueous liquid has an index of refraction which is ±0.003 with respect to the index of refraction of the microparticles.
Claim 20
Dependent Claim
22 words
A laser-active dispersion according to claim 1, wherein the aqueous liquid has the same index of refraction as that of the microparticles.
Claim 21
Dependent Claim
29 words
A laser-active dispersion according to claim 1, wherein the aqueous liquid has an index of refraction which is ±0.003 with respect to the index of refraction of the microparticles.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |