Nonlinear optical spectrum of diamond at femtosecond regime

Author(s)

Almeida, Juliana M. P. ^[1] ; Oncebay, Charlie ^[1] ; Siqueira, Jonathas P. ^[1] ; Muniz, Sergio R. ^[1] ; De Boni, Leonardo ^[1] ; Mendonca, Cleber R. ^[1]

Affiliation

^[1] Univ Sao Paulo, Sao Carlos Inst Phys, POB 369, BR-13560970 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: SCIENTIFIC REPORTS; v. 7, OCT 30 2017.
• Web of Science Citations: 5

Abstract

Although diamond photonics has driven considerable interest and useful applications, as shown in frequency generation devices and single photon emitters, fundamental studies on the third-order optical nonlinearities of diamond are still scarce, stalling the development of an integrated platform for nonlinear and quantum optics. The purpose of this paper is to contribute to those studies by measuring the spectra of two-photon absorption coefficient (beta) and the nonlinear index of refraction (n(2)) of diamond using femtosecond laser pulses, in a wide spectral range. These measurements show the magnitude of beta increasing from 0.07 to 0.23 cm/GW, as it approaches the bandgap energy, in the region from 3.18 to 4.77 eV (390-260 nm), whereas the n(2) varies from zero to 1.7 x 10(-19) m(2)/W in the full measured range, from 0.83-4.77 eV (1500-260 nm). The experimental results are compared with theoretical models for nonlinear absorption and refraction in indirect gap semiconductors, indicating the two-photon absorption as the dominant effect in the dispersion of the third-order nonlinear susceptibility. These data, together with optical Kerr gate measurements, also provided here, are of foremost relevance to the understanding of ultrafast optical processes in diamond and its nonlinear optical properties. (AU)

• FAPESP's process: 11/12399-0 - Femtosecond pulses applied to nonlinear optics: spectroscopy, pulse shaping and microfabrication
• Grantee: Cleber Renato Mendonça
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/07276-1 - CEPOF - Optics and Photonic Research Center
• Grantee: Vanderlei Salvador Bagnato
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 16/20886-1 - Ultrafast nonlinear optical spectroscopy: Transient Absorption and optical Kerr Gate with polarization control
• Grantee: Leonardo de Boni
• Support Opportunities: Regular Research Grants
• FAPESP's process: 15/17058-7 - Implementation and application of LIFT with femtosecond laser in glasses of high optical nonlinearities
• Grantee: Juliana Mara Pinto de Almeida
• Support Opportunities: Scholarships in Brazil - Post-Doctoral