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Electrical and electronic engineering
Mid-infrared Raman sources based on spontaneous Raman scattering have been demonstrated in a 15-lm diameter glass-clad crystalline germanium optical fiber and in a germanium-wire. A quantum cascade laser was used as pump at a wavelength of 5.62 lm. Because of their ultra-high optical nonlinearities and extremely broad transparency window, germanium core fibers offer the possibility of fabricating compact and efficient mid-infrared sources.
Wang, P. et al (2013) Mid-Infrared Raman Sources Using Spontaneous Raman Scattering in Germanium Core Optical Fibers. Applied Physics Letters, 102, 011111; doi:10.1063/1.4773884