Applied Laser Medicine by G. Müller (auth.), Professor Dr. H.-Peter Berlien, Professor

By G. Müller (auth.), Professor Dr. H.-Peter Berlien, Professor Dr.-Ing. Gerhard J. Müller (eds.)

The historical past of laser functions in drugs begins al­ within the early Nineteen Nineties a concerted motion software such a lot with the discovery of the laser itself. backed via the eu fee used to be conducted in Europe for the dissemination of the secure use of It was once just a couple of months after Maiman's invention lasers in drugs, and in 1996 the same application used to be whilst this new high-intensity gentle resource was once used for scientific functions. mild as a healing device built with Russia. It was once this German--Russian had lengthy been utilized in medication, specifically in oph­ cooperation that resulted in a Russian model of the Ger­ thalmology and dermatology. as a result, those disci­ guy unique loose-leaf guide. The editors genuine­ plines have been the 1st to exploit this new instrument. ized an ever-growing call for for an English model of this instruction manual, too. for that reason, the editors are very even though the early effects weren't as promising as thankful to the Springer publishing residence for aid­ anticipated, a brand new box for scientific prognosis and deal with­ ment have been outlined. lots of the problems within the ing the English version of the German original.

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By using Q-switching, typical pulse energies of up to a few Joule can be reached. Modern flash lamps achieve lifetimes of more than 107 discharges. Continuously pumped lasers can also employ Qswitching. In this case, much higher repetition rates in the MHz range - are possible. However, for pulsed Nd:YAG lasers, the achievable repetition rates are almost 3 orders of magnitude lower. Due to its reduced efficiency, cw pumping achieves a considerably lower pulse power and pulse energy. Approximately constant pulse power can be delivered for a a repetition frequency which is associated with the lifetime of the upper laser level (for Nd:YAG this is about 250 Jls).

Employing presently available dyes, it is possible to cover the entire wavelength range from 400 to 900 nm. Basic Design Two types of dye laser design can be distinguished: firstly, the pulsed system with a dye-filled cuvette as presented in Fig. 1. Figure 1 indicates an example of a dye laser. The dye molecules are excited by a flash lamp arranged parallel to the cuvette. An elliptical mirror surrounds the flash lamp and optic cell, focusing all the light of the flash lamp onto the cuvette. To increase the service life of the dye, the contents of the optical cell is pumped over and cooled.

Design of a flash lamp-pumped dye laser K. Diirschel and J. Helfmann 38 through a small flat nozzle and are excited as a free beam by the pumping laser. Laser Media Various dyes are employed as laser media. A typical representative of these aromatic molecules with conjugated double bonds, is rhodamine 6G (R 6G); its structural formula is indicated in Fig. 2. Since these dyes can be applied only for a limited wavelength range, various dyes are employed to cover the complete visible spectral range.

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