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All-fibre photonic crystal distributed Bragg reflector (PC-DBR) fibre laser

J. Canning, N. Groothoff, E. Buckley, T. Ryan, K. Lyytikainen, and J. Digweed

Open Access Open Access

Abstract

We describe an Er3+-doped aluminosilicate core photonic crystal fibre laser incorporating distributed Bragg reflectors written by two-photon 193nm irradiation through an optical phase mask as the feedback elements. The laser is diode pumped at 980nm and evidence of dual linewidth laser operation close to threshold is observed. However, at higher pumping levels gain competition preferentially selects one laser line.

©2003 Optical Society of America

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Figures (9)
Fig. 1
Fig. 1 Relative Index step from pure silica of preform core.

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Fig. 2
Fig. 2 White light transmission micrographs of cleaved 100µm diameter Er3+aluminosilicate-core photonic crystal fibre. On the right hand side is a greater magnification of the core region.

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Fig. 3
Fig. 3 Gain per unit length of Er3+-doped aluminosilicate core photonic crystal fibre as a function of wavelength.

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Fig. 4.
Fig. 4. Typical characteristic grating growth curves for grating in Er3+-doped aluminosilicate core photonic crystal fibre. Grating strength as a function of fluence is shown on the left and

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Fig. 5.
Fig. 5. Typical spectra of gratings in Er3+doped aluminosilicate core photonic crystal fibre used as laser feedback elements.

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Fig. 6.
Fig. 6. Transmission spectra of distributed Bragg reflector (DBR) resonator.

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Fig. 7.
Fig. 7. Schematic example of all-fibre laser configuration employed.

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Fig. 8.
Fig. 8. Evolution of the lasing signal as the pump power is ramped up. The onset of two primary lasing modes is observed-one at a significantly lower threshold than the other.

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Fig. 9.
Fig. 9. Characteristic laser curve for the photonic crystal fibre DBR laser.

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