By Helena Jelínková
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Additional info for Lasers for medical applications: Diagnostics, therapy and surgery
New possibilities offered by lasers in medical applications include the connection of various types of lasers with endoscopes, microscopes, or operating electro-coagulators. A prerequisite for the further development of laser systems in medicine is to deepen basic biological research into the interactions between lasers and living tissue at the cellular and molecular level. Sophisticated, highly manageable devices, along with better knowledge of the optical properties of tissue, will enable accurately determined destruction of pathological tissue and its treatment in the future.
He-Ne) (b) or excimer laser (c). 9 Continued. g. g. Rhodamine 6G laser) (e). (Used with permission from JENOPTIK Laser GmbH). 2 Laser resonator fundamentals The resonator can be constructed in a stable or unstable arrangement according to the direction of radiation from its mirrors after reflection (Hodgson and Weber, 2005; Siegman, 1986). The resonator configurations which are mostly used in the laser system are stable, meaning that they concentrate the wave after the reflection on the mirrors into the active medium placed inside the resonator.
16). In the case of a Q-switched regime the energy is stored inside the active material using a special shutter inserted inside the optical resonator, which decreases the quality factor Q and prevents the origin of the oscillation (for more details see Chapter 5). When the maximum possible stored energy is reached in the active medium, the shutter is released from the resonator, laser radiation is quickly amplified going through the laser resonator, and a very intensive so-called giant pulse is generated.
Lasers for medical applications: Diagnostics, therapy and surgery by Helena Jelínková