Abstract

We measured the higher-order modes of a diffractive-optic graded-phase resonator by suppressing the lower-order modes of a flash-lamp-pumped Nd:YAG laser with spatial filters. A diffractive-optic end mirror was used to establish a flattop fundamental mode. Measurements of the fundamental and higher-order mode shapes agreed with theoretical models. Quantitative measurements of modal discrimination substantiate the predictions of large discrimination between the fundamental and second-order modes.

© 1995 Optical Society of America

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References

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  1. P. A. Bélanger, C. Paré, Opt. Lett. 16, 1057 (1991).
    [CrossRef] [PubMed]
  2. P. A. Bélanger, R. L. Lachance, C. Paré, Opt. Lett. 17, 739 (1992).
    [CrossRef] [PubMed]
  3. C. Paré, P. A. Bélanger, IEEE J. Quantum Electron. 28, 355 (1992).
    [CrossRef]
  4. V. Kermene, A. Saviot, M. Vampuille, B. Colombeau, C. Froehly, T. Dohnalik, Opt. Lett. 17, 859 (1992).
    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
  6. J. W. Goodman, Introduction to Fourier Optics (McGraw-Hill, San Francisco, Calif., 1968), p. 49.

1994

1992

1991

Bélanger, P. A.

Chen, D.

Colombeau, B.

Dohnalik, T.

Froehly, C.

Goodman, J. W.

J. W. Goodman, Introduction to Fourier Optics (McGraw-Hill, San Francisco, Calif., 1968), p. 49.

Kermene, V.

Lachance, R. L.

Leger, J. R.

Paré, C.

Saviot, A.

Vampuille, M.

Wang, Z.

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Figures (4)

Fig. 1
Fig. 1

Experimental measurements of (a) the near-field and (b) the far-field patterns of the fundamental mode.

Fig. 2
Fig. 2

Experimental measurements of (a) the near-field and (b) the far-field patterns of the second-order (TEM10) mode.

Fig. 3
Fig. 3

Comparison of the cross sections for (a) the experimental second-order mode and (b) the theoretical second-order mode for the 14th-order super-Gaussian diffractive mirror.

Fig. 4
Fig. 4

Measured modal threshold gain of the TEM00, TEM10, and TEM11 modes as a function of output aperture size. The modal threshold gain is normalized by the threshold gain of the fundamental mode with a 2-mm aperture.

Equations (1)

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σ = 1 S 2 π ( waves ) .

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