Index of refraction measurement on sapphire at low temperatures and visible wavelengths. Measurements for a number of binary oxide and fluoride crystals have been analyzed under the assumption that the hyperpolarizability of the anion is much larger than that of the cation. COVID-19 is an emerging, rapidly evolving situation. When operating near the SC generation threshold, the overall degrees of temporal and spectral coherence exhibit an axial dip in the spatial domain, whereas in the far field, the degree of coherence is highest around the optical axis. The nonlinear refractive index, n2, of sapphire was experimentally measured in the 550–1550-nm wavelength range by use of a picosecond Z-scan technique. You may subscribe either as an OSA member, or as an authorized user of your institution. The detailed characteristics of the dynamics of the track evolution depend on the temporal shape of the incident laser pulse. J. Opt. The nonlinear indices of a number of complex oxides (i.e., those with more than one cation) have been calculated from the partial hyperpolarizabilities deduced from the data for the binary oxides. Contact your librarian or system administrator Article level metrics are available to subscribers only. A numerical model for such non-linear pulse coupling is presented and compared to data taken at the high-power laser Draco with self-referenced spectral interferometry (SRSI). A 3(12) 2109-2115 (1986). The nonlinear refractive indices (n2) of a large number of optical crystals have been measured at a wavelength near one micrometer with use of nearly degenerate three-wave mixing. Refractive index of Irtran 2 as a function of wavelength and temperature. Active 2 years, 9 months ago. Initial results are presented for a number of materials of scientific and technological interest. You do not have subscription access to this journal. The measurements were made over a wavelength range of 477-701 nm and a temperature range of 20-295 K. These pulse durations are to our knowledge the shortest ever generated directly from a laser oscillator. The results were modeled by applying a theory based on the second-order perturbation theory and the Kramers-Kronig relationship for direct-gap semiconductors, which are important for the development of GaN-based nonlinear photonic devices. Tapping and M. L. Reilly, "Index of refraction of sapphire between 24 and 1060°C for wavelengths of 633 and 799 nm," J. Opt. Appl Opt. Am. The result demonstrates that Raman-induced self-frequency shifting of the pulse does not limit sub-10-fs pulse generation from colquiriite crystals. Since spinels have an isometric crystal structure, they have no double refraction. The measured halide ion hyperpolarizabilities for several alkali-halide crystals are in reasonable agreement with recent self-consistent calculations. The measurements were made over a wavelength range of 477-701 nm and a temperature range of 20-295 K. A three-term Sellmeier dispersion equation was fit to the data to permit refractive-index interpolation within several parts in 10(4). Low-dispersion prisms and double-chirped mirrors provide broadband controlled dispersion and high reflectivity. This website uses cookies to deliver some of our products and services as well as for analytics and to provide you a more personalized experience. This site needs JavaScript to work properly. | The dispersive nonlinear refractive index of ultra-silicon-rich nitride, and its two-photon and three-photon absorption coefficients are measured in the wavelength range between 0.8 µm–1.6 µm, covering the O- to L – telecommunications bands.