It is suggested that the addition of water spray for 1 or more seconds after irradiation reduces post-irradiation temperature rise, possibly leading to thermal damage on the dental pulp tissue.
Abstract:In this study, an electro-optically Q-switched 2.70 μm emission Er:Cr:YSGG laser with a LiNbO3 Pockels cell is investigated and compared with a FTIR Q-switched scheme. It can obtain nanosecond pulse at a low voltage of 1.4 kV using a CaF 2 polarizer and a LiNbO3 crystal with Brewster's angle cut ends. Wavelength generation of 2.70 μm was possible with a Fresnel loss at a rear mirror with a dielectric dichroic coating. The maximum output energy of 21.5 mJ (at 1 Hz repetition rate) was achieved in TEM21 mode using the output coupler with a reflectivity of 55% at 2.70 μm. The generated maximum pulse energy and pulse width were 13.3 mJ and 159 ns in TEM 00 mode, respectively. The pulse width was shorter than 1.3 μs of the FTIR Q-switched scheme. Q-switched pulse energy and pulse width as a function of the electrical input energy (output coupler with 55% reflectivity at 2.70 μm and a switching time of 120 μs) at a repetition rate of 1 Hz
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