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A new long-period fiber grating structure based on a tapered fiber side contacted with a metal grating is proposed and demonstrated in this paper. The temperature/index tuning sensitivity can be enhanced, and the unusual spectral response of decreasing phase-matching wavelength with respect to increasing grating period and temperature is observed.
Ultra-short pulse compression for tunable mode-locked Ti:sapphire lasers is demonstrated by utilizing a 1-mum-diameter tapered fiber with grating pairs. For 100 fs input pulses at the 880-nm center wavelength, the optical bandwidth is broadened from 14 nm to 45 nm after propagating through the 1-cm long tapered fiber. After passing through the grating pairs with 1.6 cm separation, the final pulse...
A simple long-period fiber grating structure using a tapered fiber side-contacted with a metal grating is proposed and demonstrated. The temperature/index tuning sensitivity can be enhanced and the un-usual spectral response of decreasing phase-matching wavelength with respect to increasing temperature has been observed.
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