Abstract

We report on the generation of over 900 mW of tunable cw light at 780 nm by single pass frequency doubling of a high power fiber amplifier in a cascade of two periodically poled Lithium Niobate (PPLN) crystals. Over 500 mW is generated in the first crystal. In the limit of low pump power, we observe an efficiency of 4.6 mW/W2-cm for a single crystal, and 5.6 mW/W2-cm for a combination of two crystals, with an enhancement of the doubling efficiency observed with two crystals due to the presence of second harmonic light from the first crystal acting as a seed for the second. We have frequency locked this laser source relative to a rubidium D2 hyperfine line and demonstrated its utility in a sophisticated laser cooling apparatus.

© 2003 Optical Society of America

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References

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  1. G. D. Miller, R.G. Batchko, W. M. Tulloch, M.M. Fejer, and R.L. Byer, �??42%-efficient single-pass cw second-harmonic generation in periodically poled lithium niobate,�?? Opt. Lett. 22, 1834-1836 (1997).
    [CrossRef]
  2. P.A. Champert, S.V. Popov, and J.R. Taylor, �??Power scalability to 6W of 770 nm source based on seeded fibre amplifier and PPKTP,�?? Electron. Lett. 37, 1127-1129 (2001).
    [CrossRef]
  3. D. Fluck, and P. Gunter, �??Efficient second-harmonic generation by lens wave-guiding in KNbO3 crystals,�?? Opt. Comm. 147, 305-308 (1998).
    [CrossRef]
  4. K. Dieckmann, R.J.C. Spreeuw, M.Weidemuller, and J.T.M. Walraven, �??Two-dimensional magneto-optical trap as a source of slow atoms,�?? Phys. Rev. A 58, 3891-3895 (1998).
    [CrossRef]
  5. C. Wieman, G. Flowers, and S. Gilbert, �??A narrow-band tunable diode laser system with grating feedback, and a saturated absorption spectrometer for Cs and Rb,�?? Am. J. Phys. 63, 317 (1995).
    [CrossRef]
  6. S. Peil, S. Crane, and C.R. Ekstrom, �??High power frequency doubling for the production of 780 nm light,�?? to appear in Proceedings of the Joint Meeting of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (2003).

Am. J. Phys. (1)

C. Wieman, G. Flowers, and S. Gilbert, �??A narrow-band tunable diode laser system with grating feedback, and a saturated absorption spectrometer for Cs and Rb,�?? Am. J. Phys. 63, 317 (1995).
[CrossRef]

Electron. Lett. (1)

P.A. Champert, S.V. Popov, and J.R. Taylor, �??Power scalability to 6W of 770 nm source based on seeded fibre amplifier and PPKTP,�?? Electron. Lett. 37, 1127-1129 (2001).
[CrossRef]

Opt. Comm. (1)

D. Fluck, and P. Gunter, �??Efficient second-harmonic generation by lens wave-guiding in KNbO3 crystals,�?? Opt. Comm. 147, 305-308 (1998).
[CrossRef]

Opt. Lett. (1)

Phys. Rev. A (1)

K. Dieckmann, R.J.C. Spreeuw, M.Weidemuller, and J.T.M. Walraven, �??Two-dimensional magneto-optical trap as a source of slow atoms,�?? Phys. Rev. A 58, 3891-3895 (1998).
[CrossRef]

Other (1)

S. Peil, S. Crane, and C.R. Ekstrom, �??High power frequency doubling for the production of 780 nm light,�?? to appear in Proceedings of the Joint Meeting of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (2003).

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Figures (3)

Fig. 1.
Fig. 1.

Schematic diagram of experimental apparatus.

Fig. 2.
Fig. 2.

Measured second harmonic power versus fundamental power after: a cascade of two crystals (diamonds), crystal-1 alone (squares), and after crystal-2, with the SH from crystal-1 removed by replacing the second of the two mirrors in Fig. 1 with a dichroic beamsplitter. For the first two cases the input power is measured at the entrance of crystal-1, for the third case it is measured at the entrance to crystal-2.

Fig. 3.
Fig. 3.

(a) Saturated absorption spectrum of three of the rubidium D2 lines; (b) error signal derived from the 87Rb F=2 spectrum by lock-in detection of the frequency modulated laser.

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