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By fabricating a periodically-poled frequency-doubling crystal with a linearly-varying grating period one can define the position in the crystal at which any frequency is converted to its second harmonic. Using this method stretched pulses from an erbium-doped fibre laser were recompressed in aperiodically-poled lithium niobate [1]. In our work we describe the use of an aperiodically-poled crystal of KTP [2] to frequency-double and compress the chirped femtosecond output pulses from an optical parametric oscillator (OPO) running at a wavelength of 1.25 µm.
© 1998 IEEE
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