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Automatic Phase Compensation for Extremely Short Optical-Pulse Generation Using Wavelet Transform

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4 Author(s)
Hazu, K. ; Hokkaido Univ., Sapporo ; Narita, K. ; Sekikawa, T. ; Yamashita, M.

We introduce the wavelet transform (WT) method to automatic phase compensation for the generation of extremely short optical pulses with a duration of a few to several femtoseconds. This method is based on the immediate negative feedback of the spectral phase which is directly reconstructed by the wavelet-transform analysis with no uncertainty in phase retrieval without any manual decision, unlike the Fourier transform method. It is shown that the wavelet-transform method is useful for automatic compensations for three types of ultrabroadband pulses with different characteristics, such as: 1) a strong chirp; 2) a 600-rad spectral-phase variation over one octave bandwidth; and 3) a complicated spectral phase as well as a structured intensity spectrum.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:43 ,  Issue: 12 )