Th. Halldorsson

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We present the results of experimental and theoretical investigations on the interaction of Nd: YAG laser light with biological tissue in general, and with the bladder in particular. A comparison is made between the thermal effects achieved with this laser and those of the argon and CO2 types. A therapeutically safe yet effective dosage for the endoscopic(More)
A mathematical model is presented for the calculation of the 3-D time-dependent temperature distribution in a biological tissue (slab) irradiated by a laser beam of rectangular or Gaussian profile, which takes into account the different thermooptical properties of the tissue. Detailed consideration is given to the phenomenon of redistributive internal(More)
In laser projection systems the observer in the far field of the image points on the screen will recognize serious speckle noise. There are many methods to reduce or eliminate speckles in the near field by reducing or eliminating temporal or spatial coherence of the laser. But for the far field it is hardly possible to change the coherence properties of(More)
The preconditions relating to radiation safety for application of the Nd:YAG laser in the various fields of open and endoscopic surgery are studied. Potential eye hazards of clinical personnel using a Nd:YAG laser photocoagulator in surgical procedures are investigated and methods of eye protection are discussed. The amount of exposure of the eye to(More)
A new resonator design for doubly resonant continuous-wave intracavity sum-frequency mixing is presented. We generated 212 mW of coherent radiation at 618 nm by mixing the radiation of a 1080-nm Nd(3+):YAlO(3) laser and a 1444-nm Nd(3+):YAG laser. Two different mixing resonator setups and several nonlinear-optical crystals were investigated. So far output(More)
We present the results of experimental and theoretical investigations on the interaction of ND:YAG laser light with biological tissue in general, and with that of the bladder in particular. A comparison is made of the thermal effects achieved with this laser and those of the argon and CO2 types. A therapeutically safe yet effective dosage for the endoscopic(More)