Efficient Raman converter in the yellow range with high spatial and spectral brightness

Abstract

We present a Raman converter emitting at 583 nm on the second Stokes order of a line of propan-2-ol pumped by a microlaser at 532 nm in the sub-nanosecond regime. We used a mixture of liquids to adapt the transmission band of a photonic bandgap fiber. The internal conversion efficiency is 67% in photon numbers, and the output power is 1.06 mW, corresponding to a maximum peak power of 338 W. The beam delivered by the converter presents a Gaussian spatial structure and a high spectral brightness, typically more than five times higher than supercontinuum sources in this spectral range.

Highly efficient and reproducible evanescent Raman converters based on a silica nanofiber immersed in a liquid

“…Two different standard silica fibers were tested and compared (SMF28 and 460HP). These evanescent Raman converters are low-cost alternatives to Raman converters based on hollow core photonic crystal fibers (HCPCF) filled with liquids [19,20]. The two technologies present Raman conversion efficiencies of the same order of magnitude.…”

Liquid‐Core Optical Fibers—A Dynamic Platform for Nonlinear Photonics

“…[ 146 ] This scheme compares very well with previous results of the group where they demonstrated 67% conversion efficiency in carefully designed photonic bandgap fiber filled with propanol. [ 147 ] Yet, the evanescent Raman conversion provides a higher level of reconfigurability as the Raman‐active liquid can straight‐forward be exchanged.…”