Photodecomposition of uric-acid crystals by using a mode-locked and broadband spectrum Ytterbium fiber ring laser

We introduce a photochemical alternative procedure for uric-acid crystals degradation by controlled exposure of pulsed near infrared radiation from a ring fiber laser. The laser provides a wide spectrum from 1050 nm to 1120 nm, this spectrum exhibits a burst pulsed response with a pulse packet frequency rate of 210 kHz and an internal pulse frequency of 29 MHz. To demonstrate the technique, uric acid crystals were prepared synthetically and exposed under different radiation conditions, then by using an effective digital image processing the samples are before and after compared. Results confirm it is possible to exponentially reduce the number of crystals by an adequate combination of energy and number of pulses. The technique offers the possibility to reduce up to 50 % of the initial uric acid in a long period of safety wavelength radiation.