Under the normal temperature, Nd:YAG crystal has three fluorescence spectrums, the strength of 1.06 micrometers spectrum is nearly 4 times to that of 1.32 micrometers 's, only by selecting frequency method, 1.32 micrometers oscillation can be obtained. Modulating the 1.32 micrometers wavelength and doubling its frequency, 0.66 micrometers the SHG of 1.32 micrometers can be output. In this experiment, we obtain 23.7 W 1.32 micrometers maximum laser output and 500 mW 0.66 micrometers red laser output.
We brought forward a scheme for knubbly therapy with laser and designed a multifunctional therapeutical equipment applying two wavelengths KTP/YAG laser. Applied in clinic, it showed excellent performance and could treated the knub with multiform ways.
The purpose of program is researching the green laser amorphous silicon (a-si) solar cells material processing system and the technology of processing. The a-si cells absorption spectrum peak due to light wavelength is near 0.55 micrometers region, which is very closed to 0.53 micrometers wavelength, the second harmonic generation of 1.06 micrometers Nd:YAG laser. Using nonlinear crystal frequency doubled and Q-switch modulating technology, we can obtain more than 10 W 0.53 micrometers laser power.
Because of its high power and excellent optical features, laser has almost been applied to everywhere of medical research and clinic. Over the past several years, laser medical has achieved a rapid progress, and laser medical instruments has developed promptly, each new wavelength can be successfully applied in diagnostic and treatment of diseases. Among the medical lasers, Nd:YAG solid-state laser systems have proven useful in surgical use operate, such as neurosurgery, gastroenterology, cardioangiology, urology, gynecology, dermatology and ENT. As with other solid-state lasers, the Nd:YAG laser can be made to emit various wavelengths by means of suitable resonator configurations and some newest solid-state laser technology, pumped by the Krypton lamp, the Nd:YAG laser at room temperature exhibits transition at 1.06 micrometer Nd:YAG, using nonlinear crystal and Q-switch to double its frequency can attain 0.53 micrometer green beam. In our laser systems, the efficiency at 1.06 micrometer is more than 3 percent, an efficiency of 0.5 percent at 1.32 micrometer and 0.53 micrometer can be attained. For a power of 100w at 1.06 micrometer, 15w at 1.32 micrometer and 0.53 micrometer can therefore be produced. All of three kinds Nd:YAG laser hold these characteristics: high output power; optical fiber transition that can be cooperated with endoscope. The paper mainly discusses laser operating characteristics and clinic applications of three kinds wavelengths at 0.53 micrometer 1.06 micrometer and 1.32 micrometer Nd:YAG laser systems.