Sensitivity enhancement by increasing the nonlinear crystal length in second-order autocorrelators for ultrashort laser pulses measurement

Jarabo, S. (Universidad de Zaragoza) ; Rodríguez-Martín, E. ; Saldaña-Díaz, J.E. ; Salgado-Remacha, F.J. (Universidad de Zaragoza)

Resumen: A theoretical model for interferometric autocorrelation with long nonlinear crystal (input depleted) has been developed and applied to the measurement of the duration of ultrashort pulses. The phase-matching condition is assumed throughout pulse spectrum. The interferometric autocorrelation trace of a mode-locked fibre laser (20 nJ energy, 100 kW peak power, centred at 1595 nm) has been measured by employing a fibre interferometer to avoid misalignment effects and a BBO nonlinear crystal as long as 2 mm, in order to generate higher second-harmonic power. BBO crystal was used because it can keep the phase-matching condition throughout a wide spectrum around 1600 nm. By fitting the experimental measurements and computing according to the theoretical model exposed, it has been demonstrated that the autocorrelator sensitivity is clearly enhanced by increasing the nonlinear crystal length. A temporal duration of 0.18 ps has been obtained by fitting theoretical and experimental values.

Idioma: Inglés

DOI: 10.1016/j.optcom.2019.01.005

Año: 2019

Publicado en: Optics Communications 437 (2019), 367-372
ISSN: 0030-4018

Factor impacto JCR: 2.125 (2019)

Categ. JCR: OPTICS rank: 49 / 97 = 0.505 (2019) - Q3 - T2

Factor impacto SCIMAGO: 0.698 - Electrical and Electronic Engineering (Q1) - Physical and Theoretical Chemistry (Q2) - Electronic, Optical and Magnetic Materials (Q2) - Atomic and Molecular Physics, and Optics (Q2)

Financiación: info:eu-repo/grantAgreement/ES/MINECO/FIS2013-44174-P
Financiación: info:eu-repo/grantAgreement/ES/UZ/UZ-SANTANDER

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Física Aplicada (Dpto. Física Aplicada)
Área (Departamento): Área Óptica (Dpto. Física Aplicada)