| Autor: |
Michiel Sinaasappel, N. F. Dabhoiwala, Jan Willem Gerritsen, Hericus J. C. M. Sterenborg, Herman P. Godfried |
| Rok vydání: |
1993 |
| Předmět: |
|
| Zdroj: |
Laser-Tissue Interaction IV. |
| ISSN: |
0277-786X |
| DOI: |
10.1117/12.147655 |
| Popis: |
In studies of pulsed laser-tissue interactions it is often necessary to vary the wavelength of the incident radiation over a wide range and at the same time keep the other parameters such as laser pulse duration constant. Dye lasers will allow continuous tuning over limited ranges only, while the use of different types of lasers may lead to orders of magnitude changes in pulse duration. Optical Parametric Oscillators (OPO) can simultaneously satisfy all these demands. In the current experiments an OPO based on the nonlinear crystal (Beta) - bariumborate (BBO) was pumped by the third harmonic of a nd:YAG laser at 355 nm Tuning was possible from 400 nm to 3000 nm with a 3 ns wide output pulse. Maximum available energy was approximately 25 mJ. For initial study with this OPO system we investigated the wavelength dependency of shock wave formation after pulsed irradiation on a urinary stone in distilled water. The generated shock waves were detected using a so called Schlieren technique. Measurements were taken in the range from 460 nm to 960 nm. Results indicate a gradual increase in threshold energy for shock wave formation with increasing wavelength with no strong peaks in the spectra. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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