Strong long-period fiber gratings recorded at 352 nm.
We describe long-period grating inscription in hydrogenated telecom fibers by use of high-intensity femtosecond 352 nm laser pulses. We show that this technique allows us to fabricate high-quality 30 dB gratings of 300 microm period and 2 cm length by use of a three-photon absorption mechanism.
Dubov
Mykhaylo
M
Photonics Research Group, Electronic Engineering, Aston University, Birmingham B4 7ET, UK.
Bennion
Ian
I
Slattery
Stephen A
SA
Nikogosyan
David N
DN