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Observation of light-induced refractive index reduction in bulk glass and application to the formation of complex waveguides

2002; Optica Publishing Group; Volume: 10; Issue: 5 Linguagem: Inglês

10.1364/oe.10.000230

1094-4087

Ami M. Ljungström, Tanya M. Monro,

Advanced Fiber Optic Sensors

We show that illuminating bulk Nd-doped Bk7 glass at 488 nm induces a decrease in refractive index of order 10 -4 .Using this index change we experimentally demonstrate that it is possible to use self-writing to enhance the divergence of a Gaussian beam.Here simulations with a Laguerre-Gaussian 'donut' writing beam show that a depressed-index 'pipe' structure can be created.We demonstrate that these complex waveguide structures can subsequently be used to guide light of different wavelengths.