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Electrooptically Q-switched mid-infrared Er:YAG laser for medical applications

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Abstract

An actively Q-switched Er:YAG laser generating pulses at 2.94 μm has been developed and investigated. For a single Er:YAG generator at 3 Hz repetition rate, pulses of 91.2 ns duration and 137 mJ energy have been obtained. It corresponds to pulse train with high-peak power of ~ 1.5 MW. For 10 Hz repetition rate 30 mJ of output energy in single pulse has been achieved. These results, according to our knowledge, are the best world-wide achievements.

©2004 Optical Society of America

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Figures (8)

Fig. 1.
Fig. 1. Experimental set-up of Poclels cell Q-switched Er:YAG laser.
Fig. 2.
Fig. 2. Pulse output energy vs. pump energy for two values of voltage applied to Pockels cell (UPC).
Fig. 3.
Fig. 3. Oscilloscope picture of the shortest Q-switch pulse generated by Er:YAG laser. Lower trace - laser pulse, upper trace - voltage course applied to Pockels cell.
Fig. 4.
Fig. 4. Oscilloscope pictures of multi-pulse laser generation in case of inadequate selection of the pump energy and the control voltage of Pockels cell (a) and single-pulse generation in case of optimal laser set-up parameters (b). Upper trace - control voltage of the Q-switch, lower trace - laser pulse.
Fig. 5.
Fig. 5. Transmission dynamics of Pockels cell during have-wave voltage switching for the time base of 100 μs (a) and 2 μs (b). The measurements were carried out for the probe signal of 1.06 μm wavelength and Uλ/2 = 1.55 kV. Upper trace - Pockels cell transmission, lower trace - control voltage of Pockels cell.
Fig. 6.
Fig. 6. The dependence of the time of linear laser generation evolution (tln) on the pump energy.
Fig. 7.
Fig. 7. The dependence of normalized energy per pulse as a function of repetition rate for free-running mode of Er:YAG laser. Ep - pump energy.
Fig. 8.
Fig. 8. Hypothetical Er:YAG laser interaction with gelatine. The crater on the left was achieved for free-running pulses, and on the right - for Q-switch pulses.
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