Coherent light generators – Particular component circuitry – Optical pumping
Patent
1988-10-13
1990-05-08
Gonzalez, Frank
Coherent light generators
Particular component circuitry
Optical pumping
350 9631, 350 9633, 350 9634, 372 6, G02B 610
Patent
active
049232797
ABSTRACT:
An optical fibre for use in fibre lasers has the lasing additive eg Er.sup.3+, concentrated in center of the core. Preferably the core has an inner region which contains the additive and an outer region which is dopant free. The concentration of the dopant reduces the pump threshold for a laser and improves the gain performance for a given pump power. The fibre is conveniently made in MCVD. The use of Al.sub.2 O.sub.3 in the inner zone appears to reduce loss of dopant during tube collapse.
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Ainslie Benjamin J.
Armitage Jonathan R.
Craig Susan P.
British Telecommunications PLC
Gonzalez Frank
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