摘要
We report on noniterative spectral phase retrieval of 1:1 nJ, 8 fs pulses at 600nm by using 300-μm-thick lithium triborate crystals in a standard collinear autocorrelator with ≈2 min data acquisition time. This method is simple, sensitive, and immune to the spectral distortion and UV absorption of the linear and nonlinear optics. © 2011 Optical Society of America.