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We present a new variant of dispersion scan (d-scan) based on surfacethird-harmonic generation (STHG) and a ptychographic algorithm taylored forfull retrieval (amplitude and phase) of broadband laser pulses. We demonstratethe technique by temporally measuring and compressing few-cycle pulses with 7fs and 2.5 nJ from a Ti:Sapphire oscillator, using a sapphire window as thenonlinear medium. The results are in very good agreement with standardsecond-harmonic d-scan measurements based on a nonlinear crystal. Theintrinsically broadband and phase-matching-independent nature of STHG make thistechnique very suitable for the characterization of ultrashort laser pulsesover a broad wavelength range extending into the mid-infrared.

Temporal characterization of broadband femtosecond laser pulses by third-harmonic dispersion scan with ptychographic retrieval