Lithium tetraborate Li/sub 2/B/sub 4/O/sub 7/ (LB4) has proved to be very promising for the generation of the fourth and fifth harmonics of Nd:YAG lasers. The birefringence of LB4 is higher than that of LBO. LB4 is negative uniaxial and belongs to the 4 mm point group which means that its effective nonlinearity is maximized under the conditions of 90/spl deg/ phase-matching. The clear transmittance spans from 170 nm to 3300 nm. We demonstrate sum-frequency generation of tunable VUV femtosecond pulses with LB4 from 185 nm down to 170 nm (7.3 eV), the lower limit being set by the available fourth harmonic tunability. A comparison with an LBO reference sample reveals that LB4 has a superior performance in the VUV spectral region below 180 nm.


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    Title :

    Generation of 100-fs light pulses down to 170 nm by sum-frequency mixing in lithium tetraborate


    Contributors:
    Petrov, V. (author) / Rotermund, F. (author) / Noack, F. (author) / Komatsu, R. (author) / Sugawara, T. (author) / Uda, S. (author)


    Publication date :

    1999-01-01


    Size :

    173219 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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