Red and infrared gas laser beam for therapy

Mihail-Lucian Pascu; Marin Ristici; E. Ristici; Madalina-Elena Tivarus

doi:10.1117/12.389467

28 June 2000 Red and infrared gas laser beam for therapy

Mihail-Lucian Pascu, Marin Ristici, E. Ristici, Madalina-Elena Tivarus

Proceedings Volume 4166, Laser Florence '99: A Window on the Laser Medicine World; (2000) https://doi.org/10.1117/12.389467
Event: Laser Florence '99, 1999, Florence, Italy

Abstract

For the low power laser therapy, the experiments show that better results are obtained when the laser beam is an overlapping of two radiations: one in the visible region of the spectrum and the other in IR region. Also, some experiments show that for good results in biostimulation it is important to have a high coherence length of laser beam; this is not the case of the laser diodes The He-Ne laser has the best coherence, being able to generate laser radiations in visible and IR. It has tow strong laser lines: 633 nm and 1.15 micrometers . Although their gains are about the same, the available power of the red radiation is 3-4 times higher because of its larger width, when they oscillate separately. Using special dichroic mirrors for simultaneous reflection of the both liens, the laser beam will consist of the two radiations, each of them having good coherence . A 420 mm active length, 1.8 mm inner diameter He-Ne laser tube and a special designed resonator has been developed. The mirrors reflect both radiations as follows: one reflects 99.9 percent and the other, the output mirror, reflects 98 percent. There is a competition between them because these lines have a common lower level. The output power of the laser beam as 6 mW for 633 nm and 4 mW for 1.15 micrometers , respectively.

Citation Download Citation

Mihail-Lucian Pascu, Marin Ristici, E. Ristici, and Madalina-Elena Tivarus "Red and infrared gas laser beam for therapy", Proc. SPIE 4166, Laser Florence '99: A Window on the Laser Medicine World, (28 June 2000); https://doi.org/10.1117/12.389467

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