Article comprising a cladding-pumped optical fiber laser

Details Article comprising a cladding-pumped optical fiber laser Article comprising a cladding-pumped optical fiber laser

1996-09-24

1998-01-13

Lee, John D.

Coherent light generators

Optical fiber laser

372 68, 385142, H01S 307

Patent

active

057086699

ABSTRACT:
A cladding pumped optical fiber laser comprises a length of optical fiber having a rare earth-doped region of diameter d.sub.RE >d.sub.01 where d.sub.01 is the mode diameter of the LP.sub.01 mode of the fiber at the laser radiation at wavelength .lambda.. In one embodiment the fiber has a core diameter d.sub.c selected such that the LP.sub.01 mode is the only guided spatial mode of the fiber, and d.sub.RE is greater than d.sub.c. In another embodiment the fiber supports at least one higher order guided spatial mode, typically LP.sub.11 or LP.sub.02, and d.sub.RE is approximately equal to or larger than d.sub.c. Currently preferred embodiments comprise a grating-defined laser cavity that comprises a mode-coupling refractive index grating. Cladding pumped lasers according to the invention will typically have efficient conversion of pump radiation to laser radiation, and consequently can typically be shorter than analogous prior art cladding pumped lasers.

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"A Novel Design for a High Brightness Diode Pumped Fiber Laser Source", by P. Glas et al., Optics Communications, vol. 122, Jan. 1, 1996, pp. 163-168.
"Calculation of Modes in an Optical Fiber Using the Finite Element Method and EISPACK", by T. A. Lenahan, The Bell System Technical Journal, vol. 62, No. 9, Part 1, Nov. 1983, pp. 2663-2694.

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