Abstract
We report on two types of polarization maintaining solid photonic crystal fibers that guide light by a combination of a photonic bandgap and total internal reflection. Group and phase birefringence are studied experimentally and numerically for stress-applying parts made from B-doped and F-doped silica. The stress field originating from Ge-doped cladding rods is shown to interfere with the stress field from the B-doped and F-doped rods. Since the differential expansion coefficients of B-doped and F-doped silica have opposite signs this interference is either destructive or constructive. Consequently, we found that the fiber with F-doped stress applying parts has the highest modal phase birefringence, and polarization cross talk is characterized by an h-parameter below 310(-5) m(-1).
Highlights
Solid photonic bandap fibers (SPBGF) are useful for intracavity dispersion control in pulsed lasers [1]
We report on two types of polarization maintaining solid photonic crystal fibers that guide light by a combination of a photonic bandgap and total internal reflection
The stress field originating from Ge-doped cladding rods is shown to interfere with the stress field from the B-doped and F-doped rods
Summary
Solid photonic bandap fibers (SPBGF) are useful for intracavity dispersion control in pulsed lasers [1]. Polarization noise can degrade the output pulse shape and limit the achievable pulse duration. This can be avoided by making the laser system polarization maintaining. The photonic bandgap cladding allows single mode operation and anomalous dispersion at 1030 nm, while having a relatively large mode field diameter. These properties are not simultaneously achievable using a conventional total internal reflection (TIR) guiding fiber. The bandgap fiber approach, on the other hand, readily enables polarization maintaining operation and has the benefit of acting as a spectral filter due to the finite bandwidth of the photonic bandgaps [4]
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