Dispersion tailoring of femtosecond laser written chirped fiber Bragg gratings by selective femtosecond laser post-processing

Timothy O. Imogore; Ria G. Krämer; Thorsten A. Goebel; Thorsten A. Goebel; Christian Matzdorf; Daniel Richter; Stefan Nolte; Stefan Nolte

doi:10.1364/OL.411679

Optics Letters
Vol. 45,
Issue 23,
pp. 6526-6529
(2020)
•https://doi.org/10.1364/OL.411679

Dispersion tailoring of femtosecond laser written chirped fiber Bragg gratings by selective femtosecond laser post-processing

Timothy O. Imogore, Ria G. Krämer, Thorsten A. Goebel, Christian Matzdorf, Daniel Richter, and Stefan Nolte

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Timothy O. Imogore, Ria G. Krämer, Thorsten A. Goebel, Christian Matzdorf, Daniel Richter, and Stefan Nolte, "Dispersion tailoring of femtosecond laser written chirped fiber Bragg gratings by selective femtosecond laser post-processing," Opt. Lett. 45, 6526-6529 (2020)

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Abstract

We present the tuning of the dispersion properties of a femtosecond (fs) laser inscribed chirped fiber Bragg grating (CFBG), realized by selectively modifying the refractive index of the already inscribed CFBG by fs laser post-processing. This Letter demonstrates for the first time, to the best of our knowledge, a flexible approach for tailoring higher-order dispersion terms of a fs inscribed CFBG via fs post-processing of selected grating regions, thus paving the way, e.g., for applications in dispersion management of ultrashort pulse fiber lasers.

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	SOD ( ${p s}^{2}$ )	TOD ( ${p s}^{3}$ )	Maximum $Δ n_{d c}$
Pristine CFBG 1	$- 12.1 \pm 0.2$	$- 0.02 \pm 0.10$	$3.1 \times 10^{- 4}$
PP-Step 1	$- 12.2 \pm 0.2$	$+ 1.49 \pm 0.10$	$6.3 \times 10^{- 4}$
PP-Step 2	$- 12.1 \pm 0.2$	$+ 1.84 \pm 0.10$	$7.9 \times 10^{- 4}$

	SOD ( ${p s}^{2}$ )	TOD ( ${p s}^{3}$ )	Maximum $Δ n_{d c}$
Pristine CFBG 2	$- 12.0 \pm 0.2$	$+ 0.38 \pm 0.10$	$3.4 \times 10^{- 4}$
PP	$- 11.9 \pm 0.2$	$- 0.62 \pm 0.10$	$2.7 \times 10^{- 4}$

	SOD ( ${p s}^{2}$ )	TOD ( ${p s}^{3}$ )	Maximum $Δ n_{d c}$
Pristine CFBG 1	$- 12.1 \pm 0.2$	$- 0.02 \pm 0.10$	$3.1 \times 10^{- 4}$
PP-Step 1	$- 12.2 \pm 0.2$	$+ 1.49 \pm 0.10$	$6.3 \times 10^{- 4}$
PP-Step 2	$- 12.1 \pm 0.2$	$+ 1.84 \pm 0.10$	$7.9 \times 10^{- 4}$

	SOD ( ${p s}^{2}$ )	TOD ( ${p s}^{3}$ )	Maximum $Δ n_{d c}$
Pristine CFBG 2	$- 12.0 \pm 0.2$	$+ 0.38 \pm 0.10$	$3.4 \times 10^{- 4}$
PP	$- 11.9 \pm 0.2$	$- 0.62 \pm 0.10$	$2.7 \times 10^{- 4}$

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