Optoelectronics, Instrumentation and Data Processing. Vol. 61, No. 1, Pages 12-18, 2025

A. V. Andrianov^a^,*, N. I. Sal’nikov^{a, b}, E. A. Anashkina^a, V. V. Dorofeev^{a, c}, S. E. Motorin^{a, c}, A. R. Sharafeev^c, O. V. Timofeev^c, and A. G. Litvak^a

^aGaponov-Grekhov Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, 603950 Russia

^bLobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, 603950 Russia

^cDevyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences, Nizhny Novgorod, 603951 Russia

Abstract— A tellurite glass based fiber with two interacting bimodal cores was manufactured to study the linear and nonlinear propagation of ultrashort pulses in it. In the manufactured fiber, the effect of the nonlinear optical switching of ultrashort pulses at a wavelength of \(1{.}56\) \(\mu\)m was experimentally demonstrated in the form of energy redistribution between the cores at the output from the fiber upon an increase in the energy of an input pulse supplied to one of the fiber cores. The effect was observed at relatively low pulse energies below 2 nJ to be of interest for the creation of saturable absorbers for fiber lasers with synchronization of modes.

Keywords: multicore light guides, nonlinear optical switchers, tellurite light guides, ultrashort pulses

Nonlinear Optical Switching of Ultrashort Pulses in a Two-Core Tellurite Light Guide