The properties of traditional silica are elevated to new dimensions by photonic crystal fibers, from the exploitation of the high optical nonlinearities of PCF in supercontinuum generation, to the low mid-infrared attenuation of hollow core PCF – a spectral region of growing interest for applications in medicine and spectroscopy considering the strong target absorption bands and the emergence of new generations of mid-IR laser sources.
The spectral attenuation of hollow core PCF (2000->4000 nm) and PCF (300-2700 nm) is measured by the cut-back technique using a Bentham DTMc300 triple-grating double monochromator with motorized slits, and fiber connectorized input, configured for the range 300-5000 nm.
Over this broad spectral range, simple operation is provided by fully automated grating control, detector selection, and slit adjustment for constant bandwidth. The sensitive detection offers a good signal to noise even with a single-mode fiber and a black body source. In the mid-IR, the use of a cryogenically cooled InSb detector enables accurate measurement of attenuation even in this unfavorable wavelength range.
Attenuation Spectrum of Hollow Silica Fiber
Inset: transmission spectrum through 83 m fiber (blue) and transmitted HeNe laser spectrum (red, 0.5 nm resolution) through 78 m of fiber.
Application information courtesy of Dr William Wadsworth, University of Bath.
This information has been sourced, reviewed and adapted from materials provided by Bentham Instruments Limited.
For more information on this source, please visit Bentham Instruments Limited.