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Raman Wavelength Conversion in Ionic Liquids

Rotem Kupfer1,*,§, Furong Wang2,†, James F. Wishart2,‡, Marcus Babzien1, Mikhail N. Polyanskiy1, Igor V. Pogorelsky1, Triveni Rao3, Luca Cultrera3, Navid Vafaei-Najafabadi1,4 et al.

Mark A. Palmer1

  • 1Accelerator Test Facility, Brookhaven National Laboratory, Upton, New York 11973 USA
  • 2Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973 USA
  • 3Instrumentation Division, Brookhaven National Laboratory, Upton, New York 11973 USA
  • 4Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA

  • *kupfer2@llnl.gov
  • †fwang1@bnl.gov
  • ‡wishart@bnl.gov
  • §Current address: Lawrence Livermore National Laboratory, Livermore CA 94550, USA
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Phys. Rev. Applied 19, 014052 – Published 19 January, 2023

DOI: https://doi.org/10.1103/PhysRevApplied.19.014052

Abstract

We explore the use of room-temperature ionic liquids (ILs) as Raman wavelength converters. ILs provide an engineerable framework to design suitable liquids for wavelength conversion over a broad spectral range, through careful selection of the molecular structures of the IL anions and cations so that specific characteristics can be obtained, such as a desirable Raman shift, low Brillouin scattering, and good optical transmission in the pump and Stokes wavelengths. Applying such criteria, we demonstrate that 1-ethyl-3-methylimidazolium dicyanamide (EMIM DCA) is an effective medium for conversion of 532-nm pulses from a Q-switched Nd:YAG laser to 603 nm. This corresponds to an approximate 2200 cm−1 shift, which can be used to generate mid-infrared radiation through subsequent difference frequency generation for optical pumping of CO2 lasers. Threefold-higher Raman conversion efficiency is obtained in EMIM DCA compared with water under identical conditions in a proof-of-principle single-pass conversion setup, resulting in an efficient generation of multimillijoule, <6 ns duration, high-quality orange laser pulses in a wavelength region that is difficult to access at high energies. Consequently, we examine ILs representing two other classes of Raman-active functional groups and obtain conversion up to the fifth-order Stokes shift and first anti-Stokes shift. Through the tunable selection of their components and their useful dynamical properties, ILs provide a platform for efficient, simple, and alignment-tolerant high-energy Raman shifting with numerous industrial and technological applications.

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Physics Subject Headings (PhySH)

synopsis

A Salt-Based Laser Color Converter

Published 19 January, 2023

Artificial salts that are liquid at room temperature can be used to efficiently tune the wavelength of a laser source.

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Phys. Rev. Applied 19, 014052– Published 19 January, 2023
  • Received 16 June 2022
  • Accepted 8 December 2022
Article part of CHORUS
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