Reference-frequency generation by Raman-enhanced four-photon mixing.
Reference-frequency generation for optical fiber instrumentation is now restricted to the frequency bands in which the reference materials have well-resolved absorption lines. We study analytically and experimentally the possibility of generating reference wavelengths by use of Raman-enhanced four-photon mixing in an optical fiber. We show that it is possible to generate efficiently frequencies that are 10-40 nm away from the absorption bands of the usual reference materials: acetylene (12C2H2), hydrogen cyanide (HCN), and similar or derived species. As a demonstration we use an acetylene cell to generate reference frequencies that cover the whole C (1530-1565 nm) and some part of the L (1565-1625 nm) transmission bands of the optical fiber.
Martín López
Sonia
S
Instituto de Física Aplicada, Consejo Superior de Investigaciones Científicas, Serrano 144, 28006 Madrid, Spain. ltqm358@cetef.csic.es
González Herráez
Miguel
M
Corredera
Pedro
P
Hernanz
María Luisa
ML
Corróns
Antonio
A