Abstract
Normal dispersion cavities make possible the use of very long cavity lengths to maximise pulse energy in fiber lasers. However, a long cavity can minimise the effect of gain dispersion and cavity modulation, both of which act to shorten chirped pulse widths.[1] Sinusoidal modulation at the fundamental cavity mode of a long cavity results in very broad, low power pulses with narrow band- widths due to the reduced effect of self phase modulation (SPM). One solution is to use a narrow pulse to modulate the cavity, and highly chirped pulses with bandwidths of over 10 nm have been generated using this technique. [2] If the pulse chirp is not known, the side range of possible pulse modulation shapes makes an ansatz analysis difficult because a full characterisation of the pulse solution requires definition of both pulse intensity and chirp. In this paper, a method is derived for determining the pulse chirp, given the pulse shape.
© 1996 Optical Society of America
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