A novel technique for the measurement of low optical absorption coefficients of the massive crystal boules of an arbitrary shape is proposed. It is based on the concept of equivalent temperature of the crystal interacting with laser radiation. Optical absorption coefficient of the LBO boule was measured. The accuracy of the method was theoretically estimated.
We propose a novel technique for measuring the surface temperature distribution of optical elements interacting with high power laser radiation. This technique is based on measuring the temperature sensitive piezoelectric resonance frequencies of nonlinear-optical crystals that are transparent at involved laser radiation wavelengths. Using small thermoresonators made of lithium niobate (LiNbO3) crystals the kinetics of the surface temperature distribution of the silica lens heated by 11W CW laser radiation at 1064 nm was measured. Modeling of the experiment results reveal the optical absorption coefficient of the lens to be 6×10-5 cm-1.
In this work, we present the first histological in vivo and ex vivo study of effects of fractional Er fiber laser (wavelength 1550 nm, peak power 25 W) on keratinized gum and alveolar mucosa for gum regeneration. Biopsy with subsequent NBTC staining was used as primary evaluation technique. Ex vivo, porcine tissue model was used. Effects of pulse energy, beam diameter, and beam divergence were investigated in detail. It has been demonstrated that under optimal conditions columns up to 800 μm in depth could be reliably produced with 130 mJ pulses. Clinically, 2 subjects were treated and 4 punch biopsies were collected. The results were compared with ex vivo data. Both ex vivo and in vivo datasets suggest feasibility of a dental fractional system intended for gum regeneration.
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