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  • Title: Radially polarized and pulsed output from passively Q-switched Nd:YAG ceramic microchip laser.
    Author: Li JL, Ueda K, Musha M, Zhong LX, Shirakawa A.
    Journal: Opt Lett; 2008 Nov 15; 33(22):2686-8. PubMed ID: 19015709.
    Abstract:
    For the first time, to the best of our knowledge, a radially polarized laser pulse was produced from a passively Q-switched Nd:YAG ceramic microchip laser with a piece of Cr4+:YAG crystal as the saturable absorber and multilayer concentric subwavelength grating as the polarization-selective output coupler. The averaged laser power reached 450 mW with a slope efficiency of 30.2%. The laser pulse had a maximum peak power of 759 W, a minimum pulse duration of 86 ns, and a 6.7 kHz repetition rate at 3.7 W absorbed pump power. The polarization degree of the radially polarized pulse was measured to be as high as 97.4%. Such a radially polarized laser pulse with a high peak power and a short width is important to numerous applications such as metal cutting.
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