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14-September-2008 18:38:49 - laser Close-up of a table-top dye laser based on Rhodamine 6G, emitting at 580 nm yellow-orange. The emitted laser beam is visible as faint yellow lines. The orange dye solution enters the laser from the left, and is pumped by a 514 nm blue-green beam from an argon laser. The dye jet is in the center of the image, behind the yellow window. Close-up of a table-top dye laser based on Rhodamine 6G, emitting at 580 nm yellow-orange. The emitted laser beam is visible as faint yellow lines. The orange dye solution enters the laser from the left, and is pumped by a 514 nm blue-green beam from an argon laser. The dye jet is in the center of the image, behind the yellow window. An atomic vapor laser isotope separation experiment at LLNL. Green light is from a copper vapor pump laser used to pump a highly tuned dye laser which is producing the orange light. An atomic vapor laser isotope separation experiment at LLNL. Green light is from a copper vapor pump laser used to pump a highly tuned dye laser which is producing the orange light. A dye laser is a laser which uses an organic dye as the lasing medium, usually as a liquid solution. Compared to gases and most solid state lasing media, a dye can usually be used for a much wider range of wavelengths. The wide bandwidth makes them particularly suitable for tunable lasers and pulsed lasers. Moreover, the dye can be replaced by another type in order to generate different wavelengths with the same laser, although this usually requires replacing other optical components in the laser as well. Dye lasers are also used dermatologically, to make skin tone more even. Contents 1 Construction 2 Chemicals used 3 Ultra-short optical pulses 4 References Construction Since organic dyes tend to degrade under the influence of light, the dye solution is normally circulated from a large reservoir1. The dye solution can be flowing through a cuvette, i.e., a glass container, or be as a dye jet, i.e., as a sheet-like stream in open air from a specially-shaped nozzle. With a dye jet, one avoids reflection losses from the glass surfaces and contamination of the walls of the cuvette. These advantages come at the cost of a more-complicated alignment. Dye lasers emission is inherently broad. In order to produce narrow bandwidth tuning these lasers use many types of cavities and resonators which include gratings, prisms, and etalons2. Chemicals used Some of the dyes are Rhodamine 6G, fluorescein, coumarin, stilbene, umbelliferone, tetracene, malachite green, and others. Adamantane is added to some dyes to prolong their life. Cycloheptatriene and cyclooctatetraene COT can be added as triplet quenchers for rhodamine G, increasing the laser output power. Output power of 1.4 kilowatt at 585 nm was achieved using Rhodamine 6G with COT in methanol-water solution. A ring dye laser. P-pump laser beam; G-gain dye jet; A-saturable absorber dye jet; M0, M1, M2-planar mirrors; OC-output coupler; CM1 to CM4-curved mirrors. A ring dye laser. P-pump laser beam; G-gain dye jet; A-saturable absorber dye jet; M0, M1, M2-planar mirrors; OC-output coupler; CM1 to CM4-curved mirrors. Ultra-short optical pulses R. L. Fork, B. I. Greene, and C. V. Shank have demonstrated, in 1981, the generation of ultra-short laser pulse using a ring-dye laser or dye laser exploiting colliding pulse mode-locking. Such kind of laser is capable of generating laser pulses of ~ 0.1 ps duration.3 References ^ F. P. Schäfer and K. H. Drexhage, Dye Lasers., 2nd rev. ed., vol. 1, Berlin ; New York: Springer-Verlag, 1977 ^ F. J. Duarte and L. W. Hillman, Dye Laser Principles Academic, 1990 ^ R. L. Fork, B. I. Greene, and C. V. Shank 1981, Generation of optical pulses shorter than 0.1 psec by colliding pulse mode locking, Applied Physics Letters, 38: 671-672. Retrieved from http://en..org/wiki/Dye_laser Categories: Lasers Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Deutsch Español Italiano Nederlands Português РуÑ?Ñ?кий This page was last modified on 13 September 2008, at 20:35
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