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| Since the invention of mode-locked lasers, considerable effort has been directed towards the generation of ultrashort optical pulses. Novel techniques for broad-band dispersion control now enable self-mode-locked Ti:Sapphire lasers to directly produce 6.5 femtosecond pulses. Compression of pulses down to sub-5 fs is achievable by treating the outputs of such lasers with novel spectral broadening techniques in external pulse compressors. However, in cases where the pulses are uncharacterized, or when the spectral phase cannot be approximated, these techniques for pulse compression cannot be used efficiently, since the spectral transfer function needed to form the desired output pulse cannot be calculated. Furthermore, practical considerations limit the use of such techniques to situations where the pulse source is substantially constant in time. As the speed of optical communication increases, the disadvantages of currently available pulse compression technologies become more and more felt. The present invention seeks to provide an improved pulse compressor, which overcomes these disadvantages and drawbacks. An adaptive pulse compressor wherein the input pulses are modified in an iterative fashion, according to a feedback signal obtained from measurement of the output pulses. The feedback signal is programmed, by means of a programmable spatial light modulator, to allow for independent control of the individual spectral components of the incoming pulses, such that almost arbitrary phase functions can be realized to accomplish efficient compression.present relates field compression ultrashort optical pulses |
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