Femtosecond nonlinear polarization evolution from cascade quadratic processes
We experimentally demonstrate strong amplitude modulation of 100 fs pulses with nonlinear polarization evolution based on type-I second-harmonic generation. Applications of this process to mode-locking of bulk and fiber lasers is promising and will be dis
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Nonlinear polarization evolution (NPE) provides intensity-dependent transmittance or reflection of light beams, which is essential for many applications. NPE based on cubic nonlinearities was first demonstrated by [1], and is now commonly employed in mode-locked fiber lasers [2, 3]. NPE can also be implemented using nonlinear phase shifts (Ll
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