Abstract

We demonstrate, for the first time to our knowledge, the use of a coherent polarization locked diode as the high-brightness pump source for a femtosecond laser. Four diode emitters are coherently locked to produce more than 5W linearly polarized, narrow linewidth, and single-lobed pump beam. This gives >10× brightness improvement over the conventional diode array. The diode beam is then used to pump a Yb:KYW laser to obtain 2W output with 57% slope efficiency in cw laser operation. By using a saturable absorber mirror, we achieved cw mode-locking operation with a 177fs pulse width at an average power of 0.55W.

© 2011 Optical Society of America

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[CrossRef]

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[CrossRef]

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[CrossRef]

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M. Hildebrandt, U. Bunting, U. Kosch, D. Haussmann, T. Levy, M. Krause, O. Muller, U. Bartuch, and W. Viol, Opt. Commun. 259, 796 (2006).
[CrossRef]

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Papadopoulos, D. N.

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[CrossRef]

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Siddiqui, A.

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Viol, W.

M. Hildebrandt, U. Bunting, U. Kosch, D. Haussmann, T. Levy, M. Krause, O. Muller, U. Bartuch, and W. Viol, Opt. Commun. 259, 796 (2006).
[CrossRef]

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Wasylczyk, P.

P. Wasylczyk and C. Radzewicz, Laser Phys. 19, 129 (2009).
[CrossRef]

Weingarten, K. J.

Weiss, S.

Zaouter, Y.

J. Opt. Soc. Am. B (1)

Laser Phys. (1)

P. Wasylczyk and C. Radzewicz, Laser Phys. 19, 129 (2009).
[CrossRef]

Opt. Commun. (1)

M. Hildebrandt, U. Bunting, U. Kosch, D. Haussmann, T. Levy, M. Krause, O. Muller, U. Bartuch, and W. Viol, Opt. Commun. 259, 796 (2006).
[CrossRef]

Opt. Express (3)

Opt. Lett. (8)

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Figures (5)

Fig. 1
Fig. 1

Experimental setup of coherent polarization locked diode laser.

Fig. 2
Fig. 2

(a) Measurement of absorption along the Nm axis in a 3 mm , Brewster-cut, 5% doped Yb:KYW used in our experiment. (b) Solid line, spectrum of CPL diode; and dashed line, Yb:KYW absorption around 980 nm .

Fig. 3
Fig. 3

Experimental setup of Yb:KYW laser pumped by CPL diode.

Fig. 4
Fig. 4

CW laser measurement with three different output couplers with transmissions of 1.5%, 3%, and 5%.

Fig. 5
Fig. 5

Left: spectrum of Yb:KYW mode-locked laser. Right: dotted line, intensity autocorrelation trace of the pulse; solid line, sech 2 function fitting.

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