Passively Q-switched microchip lasers have proved to be ideal laser sources for efficient wavelength conversion. These lasers have several advantages, such as, simple construction, compact size and ease-of-use. They also provide very high peak powers that enable efficient wavelength conversion. Recently, we have used the sub-nanosecond ‘pulse-gap’ region of Nd:YAG/Cr4+:YAG passively Q-switched microchip lasers to obtain very efficient second harmonic generation (SHG) [1], and fourth harmonic generation (FHG) [2, 3].

© 2013 IEEE

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