2.70 μ m emission Er:Cr:YSGG laser with LiNbO3 Pockels cell
✍ Scribed by Y.H. Park; H.J. Kong; Y.S. Kim; G.U. Kim
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 77 KB
- Volume
- 6
- Category
- Article
- ISSN
- 1612-2011
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✦ Synopsis
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. Eout, mJ 10 15 5 0 90 85 80 75 70 65 Ein, J 1 Hz 2 Hz 5 Hz 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