Abstract
We propose two ways of generating high- intensity subfemtosecond (~10−17-s) pulses and solitons of very high repetition rate. One approach1 is based on multifrequency cascade Raman stimulated scattering (CSRS). We predict that a pump-laser wave with frequency ωL and many cascade-excited Stokes and anti-Stokes components with frequencies ωi = ωL + jω0, j = ±1, ±2, ±3, …, can be mode locked to each other through a fast full-swing 2π nutation of population at the Raman transition with frequency ω0 ≪ ωL. Similar to bright–bright 2-π solitons in CSRS with two2 and three3 components, these solitons have a new, very simple Lorentzian intensity profile. Because of the engagement of many mode- locked components, however, their total electromagnetic field in the time domain consists of a train of ultrashort, of the order of the pump cycle 2π/ωL or even shorter, pulses separated by the interval 2π/ω0. The major feature of the proposed effect is that all the frequency components of the new soliton are so-called bright solitons, in contrast to the well-known bright-dark soliton combination in SRS.4 The high-order CSRS required to observe the proposed effect was first observed experimentally in Ref. 5 and later in many other experiments, with the total number of components as high as 10–15.
© 1995 Optical Society of America
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