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Journals and Conferences
A maximum output power of 20.6 W at 2.825 μm from an erbium-doped all-fiber laser is reported, which we believe is the highest output power for this laser transition in single-mode operation. The slope efficiency of the passively cooled laser was up to 35.4% with respect to the absorbed pump power. Accounting for an estimated round-trip intracavity loss of… (More)
Fiber Bragg gratings were written in thulium-doped and undoped single-mode ZBLAN fibers by focusing femtosecond laser pulses on the fiber core through a phase mask. Maximum index modulation of the order of 1 x 10(-3) was induced in both types of fibers. Measurements of the transverse refractive index changes across the core and cladding regions indicate… (More)
We report what we believe is the first monolithic fluoride-fiber laser making use of fiber Bragg gratings written directly in the doped fluoride-fiber core. The Tm(3+):ZBLAN fiber laser is upconversion pumped at 1070 nm and emits at 1480 nm. Using two different all-fiber cavities, we observed a threshold as low as 75 mW and a conversion efficiency of up to… (More)
A 2.3 W single transverse mode thulium-doped fluoride fiber laser based on fiber Bragg gratings is presented. The laser has a conversion efficiency of 65% to be compared to the quantum limit of 72%. The performances of the laser are compared for two pump wavelengths of 1040 and 1064 nm and are analyzed based on a rate equation analysis.
This paper reports on the first fibre Bragg gratings (FBGs) written in non-photosensitized ZBLAN fibers using fs laser pulses. Index modulations almost two orders of magnitude larger than those previously reported in a fluoride fiber (10<sup>-3</sup> vs 10<sup>-5</sup>) were achieved providing grating reflectivity greater than 99%. Preliminary results of an… (More)
A method for writing a Bragg grating in a glass optical waveguide is provided. Ultrafast optical pulses are generated, preferably in the femtosecond range and 5 having a writing wavelength in the range of 300nm to 700nm and an intensity sufficient to induce a change of refractive index in the waveguide through densification. The optical pulses are… (More)
Compact, robust and efficient laser sources near 3 µm are needed for applications such as laser surgery, mid-infrared laser pumping and sensing. Extending the benefits of fiber laser technology to this wavelength region has proven a significant challenge, mainly due to the limited number of host glasses with maximum phonon energies that are… (More)
We report an advance in the power scaling of fluoride fiber lasers using FBGs. Watt-level output power at 1480 nm is demonstrated, which is four-fold greater than the best result obtained with external bulk mirrors.