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

• Type: Article in International Scientific Journal
• Date: 2022

Authors

Gomes, T (Author) Other; Canhota, M (Author) FCUP; Crespo, H (Author) FCUP

Journal

Title: Optics Letters

Vol. 47

Pages: 3660-3663

ISSN: 0146-9592

Publisher: Optical Society of America

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Other information

Authenticus ID: P-00W-WQX

DOI: 10.1364/ol.460069

Abstract (EN): We present a new, to the best of our knowledge, variant of dispersion scan (d-scan) based on surface third-harmonic generation (STHG) and a ptychographic algorithm tailored for full retrieval (amplitude and phase) of broadband laser pulses. We demonstrate the technique by temporally measuring and compressing few-cycle pulses with 7 fs and 2.5 nJ from a Ti:sapphire oscillator, using a sapphire window as the nonlinear medium. The results are in very good agreement with standard second-harmonic d-scan measurements based on a nonlinear crystal. The intrinsically broadband and phase-matching-independent nature of STHG make this technique very suitable for the characterization of ultrashort laser pulses over a broad wavelength range extending into the mid-infrared. (C) 2022 Optica Publishing Group

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4