Abstract

The mode-locking technique using nonlinear polarization rotation via Type I second-harmonic generation (SHG) is demonstrated on the femtosecond timescale. The narrow spectral bandwidth of the loss modulation was broadened via a double crystal approach, which allows for mode-locking broadband gain media. We prove the predicted advantages of the technique to be correct utilizing intrinsic dispersion compensation and group-velocity mismatch management to produce 193 fs pulses. This eliminates the need for dispersion compensating elements. The technique can be applied to high-power lasers at any wavelength where a suitable SHG process is possible.

© 2016 Optical Society of America

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