Abstract

We demonstrate direct microwave modulation of diode lasers operated with optical feedback from a diffraction grating. We obtain substantial fractions of the laser power (2–30%) in a single sideband at frequencies as high 6.8 GHz with 20 mW of microwave power and simple inefficient microwave coupling. Using a single diode as modulated at 6.6 GHz, we trapped 87Rb atoms in a vapor cell. With only 10 mW of microwave power we laser trapped 85% as many atoms as were obtained by using two lasers in the conventional manner.

© 1993 Optical Society of America

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References

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  1. C. Monroe, W. Swann, H. Robinson, C. Wieman, Phys. Rev. Lett. 65, 1571 (1991).
    [Crossref]
  2. D. Hoffman, P. Feng, R. Williamson, T. Walker, Phys. Rev. Lett. 69, 753 (1992).
    [Crossref]
  3. R. D. Steele, Electron. Lett. 19, 69 (1983); S. D. Swartz, J. L. Hall, Joint Institute for Laboratory Astrophysics, Boulder, Colo. (personal communication, 1992); K. E. Gibble, D. S. Weiss, Stanford University, Palo Alto, Calif. (personal communication, 1992).
    [Crossref]
  4. S. Ezekiel, Final Technical Report RL-TR-91-413 (Rome Laboratory, AFMC, Griffiss Air Force Base, N.Y., 1993).
  5. C. Wieman, L. Hollberg, Rev. Sci. Instrum. 62, 1 (1991).
    [Crossref]
  6. L. Hollberg, M. Ohtsu, Appl. Phys. Lett. 53, 944 (1988).
    [Crossref]
  7. Hollberg and Ohtsu6 actually observed modulation at frequencies that were rational fractions of the reference-cavity free spectral range. In contrast, we found significant modulation only at integer multiples of the free spectral range of the cavity formed by the grating and the back facet of the laser.
  8. K. Macadam, A. Steinbach, C. Wieman, “A narrow-band tunable diode-laser system with grating feedback, and a saturated absorption spectrometer for Cs and Rb,” Am. J. Phys. (to be published).
  9. K. Petermann, Laser Diode Modulation and Noise (Kluwer, Dordrecht, The Netherlands, 1988).
    [Crossref]

1992 (1)

D. Hoffman, P. Feng, R. Williamson, T. Walker, Phys. Rev. Lett. 69, 753 (1992).
[Crossref]

1991 (2)

C. Wieman, L. Hollberg, Rev. Sci. Instrum. 62, 1 (1991).
[Crossref]

C. Monroe, W. Swann, H. Robinson, C. Wieman, Phys. Rev. Lett. 65, 1571 (1991).
[Crossref]

1988 (1)

L. Hollberg, M. Ohtsu, Appl. Phys. Lett. 53, 944 (1988).
[Crossref]

1983 (1)

R. D. Steele, Electron. Lett. 19, 69 (1983); S. D. Swartz, J. L. Hall, Joint Institute for Laboratory Astrophysics, Boulder, Colo. (personal communication, 1992); K. E. Gibble, D. S. Weiss, Stanford University, Palo Alto, Calif. (personal communication, 1992).
[Crossref]

Ezekiel, S.

S. Ezekiel, Final Technical Report RL-TR-91-413 (Rome Laboratory, AFMC, Griffiss Air Force Base, N.Y., 1993).

Feng, P.

D. Hoffman, P. Feng, R. Williamson, T. Walker, Phys. Rev. Lett. 69, 753 (1992).
[Crossref]

Hoffman, D.

D. Hoffman, P. Feng, R. Williamson, T. Walker, Phys. Rev. Lett. 69, 753 (1992).
[Crossref]

Hollberg, L.

C. Wieman, L. Hollberg, Rev. Sci. Instrum. 62, 1 (1991).
[Crossref]

L. Hollberg, M. Ohtsu, Appl. Phys. Lett. 53, 944 (1988).
[Crossref]

Macadam, K.

K. Macadam, A. Steinbach, C. Wieman, “A narrow-band tunable diode-laser system with grating feedback, and a saturated absorption spectrometer for Cs and Rb,” Am. J. Phys. (to be published).

Monroe, C.

C. Monroe, W. Swann, H. Robinson, C. Wieman, Phys. Rev. Lett. 65, 1571 (1991).
[Crossref]

Ohtsu, M.

L. Hollberg, M. Ohtsu, Appl. Phys. Lett. 53, 944 (1988).
[Crossref]

Petermann, K.

K. Petermann, Laser Diode Modulation and Noise (Kluwer, Dordrecht, The Netherlands, 1988).
[Crossref]

Robinson, H.

C. Monroe, W. Swann, H. Robinson, C. Wieman, Phys. Rev. Lett. 65, 1571 (1991).
[Crossref]

Steele, R. D.

R. D. Steele, Electron. Lett. 19, 69 (1983); S. D. Swartz, J. L. Hall, Joint Institute for Laboratory Astrophysics, Boulder, Colo. (personal communication, 1992); K. E. Gibble, D. S. Weiss, Stanford University, Palo Alto, Calif. (personal communication, 1992).
[Crossref]

Steinbach, A.

K. Macadam, A. Steinbach, C. Wieman, “A narrow-band tunable diode-laser system with grating feedback, and a saturated absorption spectrometer for Cs and Rb,” Am. J. Phys. (to be published).

Swann, W.

C. Monroe, W. Swann, H. Robinson, C. Wieman, Phys. Rev. Lett. 65, 1571 (1991).
[Crossref]

Walker, T.

D. Hoffman, P. Feng, R. Williamson, T. Walker, Phys. Rev. Lett. 69, 753 (1992).
[Crossref]

Wieman, C.

C. Monroe, W. Swann, H. Robinson, C. Wieman, Phys. Rev. Lett. 65, 1571 (1991).
[Crossref]

C. Wieman, L. Hollberg, Rev. Sci. Instrum. 62, 1 (1991).
[Crossref]

K. Macadam, A. Steinbach, C. Wieman, “A narrow-band tunable diode-laser system with grating feedback, and a saturated absorption spectrometer for Cs and Rb,” Am. J. Phys. (to be published).

Williamson, R.

D. Hoffman, P. Feng, R. Williamson, T. Walker, Phys. Rev. Lett. 69, 753 (1992).
[Crossref]

Appl. Phys. Lett. (1)

L. Hollberg, M. Ohtsu, Appl. Phys. Lett. 53, 944 (1988).
[Crossref]

Electron. Lett. (1)

R. D. Steele, Electron. Lett. 19, 69 (1983); S. D. Swartz, J. L. Hall, Joint Institute for Laboratory Astrophysics, Boulder, Colo. (personal communication, 1992); K. E. Gibble, D. S. Weiss, Stanford University, Palo Alto, Calif. (personal communication, 1992).
[Crossref]

Phys. Rev. Lett. (2)

C. Monroe, W. Swann, H. Robinson, C. Wieman, Phys. Rev. Lett. 65, 1571 (1991).
[Crossref]

D. Hoffman, P. Feng, R. Williamson, T. Walker, Phys. Rev. Lett. 69, 753 (1992).
[Crossref]

Rev. Sci. Instrum. (1)

C. Wieman, L. Hollberg, Rev. Sci. Instrum. 62, 1 (1991).
[Crossref]

Other (4)

S. Ezekiel, Final Technical Report RL-TR-91-413 (Rome Laboratory, AFMC, Griffiss Air Force Base, N.Y., 1993).

Hollberg and Ohtsu6 actually observed modulation at frequencies that were rational fractions of the reference-cavity free spectral range. In contrast, we found significant modulation only at integer multiples of the free spectral range of the cavity formed by the grating and the back facet of the laser.

K. Macadam, A. Steinbach, C. Wieman, “A narrow-band tunable diode-laser system with grating feedback, and a saturated absorption spectrometer for Cs and Rb,” Am. J. Phys. (to be published).

K. Petermann, Laser Diode Modulation and Noise (Kluwer, Dordrecht, The Netherlands, 1988).
[Crossref]

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Figures (2)

Fig. 1
Fig. 1

Percent of laser power in a single sideband for both a free-running laser (dashed curve) and a laser with grating feedback (solid curve). The free spectral range of the external cavity formed by the grating and the back facet of the laser was 3.3 GHz. The frequency response of the free-running laser shows many circuit resonances (e.g., at 6.57 GHz) owing to the inefficient coupling of the microwave power.

Fig. 2
Fig. 2

Number of atoms trapped with a single microwave modulated laser as a function of power out of the microwave source. The number of atoms is plotted relative to the number obtained in the conventional trap in which a second laser provides the hyperfine pumping. At 20 mW of microwave power, there is 2.2% of the laser light in the +6.6-GHz sideband.

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