Abstract

We demonstrate simultaneous octave-level spectral broadening and carrier-envelope-offset sensing of mode-locked Er- and Yb-doped femtosecond fiber lasers using constant-period and chirped reverse-proton-exchanged periodically poled lithium niobate waveguides. Chirped quasi-phase-matching gratings greatly improve spectral broadening of Yb-fiber lasers.

© 2007 Optical Society of America

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References

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2005 (3)

2001 (2)

2000 (1)

D. J. Jones, S. A. Diddams, J. K. Ranka, A. Stentz, R. S. Windeler, J. L. Hall, and S. T. Cundiff, Science 288, 635 (2000).
[CrossRef] [PubMed]

1997 (1)

Opt. Express (1)

I. Hartl, G. Imeshev, M. E. Fermann, C. Langrock, and M. M. Fejer, Opt. Express 17, 6490 (2005).
[CrossRef]

Opt. Lett. (5)

Science (1)

D. J. Jones, S. A. Diddams, J. K. Ranka, A. Stentz, R. S. Windeler, J. L. Hall, and S. T. Cundiff, Science 288, 635 (2000).
[CrossRef] [PubMed]

Other (2)

J.Ye and S.T.Cundiff, eds., (Springer, 2005).

C. Langrock, I. Hartl, M. E. Fermann, and M. M. Fejer, 2006 IEEE Lasers and Electro-Optics Society Annual Meeting (IEEE Lasers and Electro-Optics Society, 2006), paper PD1.4.

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Figures (4)

Fig. 1
Fig. 1

Experimental setup showing the amplified mode-locked (a) Er-doped and (b) Yb-doped fiber laser and RPE PPLN waveguide device.

Fig. 2
Fig. 2

(a) Visible and NIR spectral components created inside the waveguide by doubling (medium gray area), tripling (dark gray area), and quadrupling (white area) of the broadened (light gray area) input laser spectrum (dashed curve) for two different QPM grating lengths, 5.8 (black solid curve) and 17.4 mm (light gray solid curve). The distinctive spikes in the data correspond to (higher-order) QPM interactions. (b) f rep - and CEO-related beat signals detected in a 10 - nm -wide spectral slice around 700 nm using a Si-APD. (c) Zoom into the CEO-related beat signals. The free-running beat signal can be fitted with a 64 - kHz Lorentzian line shape. When phase locked to an RF synthesizer, the center of the beat note collapses to a resolution-bandwidth-limited coherent peak.

Fig. 3
Fig. 3

Infrared spectra out of an Er-fiber-laser-pumped RPE PPLN waveguide as a function of (a) QPM period and (b) QPM grating length ( 28 μ m period) taken with a scanning grating monochromator; energy of pump pulses was 1.2 nJ . The dashed circle in (a) marks spectral components located near the zero SHG GVM wavelength. The spectrum of the mode-locked fiber laser is shown in black (dashed curve). (c) Plot of GVM for SHG, and GVD at fundamental wavelength, for bulk lithium niobate (extraordinary wave) from dispersion data of [9].

Fig. 4
Fig. 4

NIR spectra out of a Yb-fiber-laser-pumped RPE PPLN waveguide as a function of (a) QPM period at fixed power ( 350 mW after the waveguide), (b) input power at fixed period ( 7.9 μ m ) , and (c) QPM chirp rate. The input spectrum of the Yb-fiber laser is shown in black (dashed curve).

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