Abstract

We report what is to our knowledge the first cw, dc-excited, fast-axial-flow CO2 laser using a variable-reflectivity output coupler. A super-Gaussian reflectivity profile of order 8 with 96% central reflectivity has been achieved by depositing a low-absorption coating onto a ZnSe substrate. The unstable resonator oscillated in the lowest-order mode to produce a diffraction-limited beam of 300 W of power and 0.35-mrad divergence angle (FWHM). The measured near field and far field are in good agreement with the mathematical model. The technique lends itself to extrapolation to the kilowatt level.

© 1990 Optical Society of America

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References

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  1. P. Muys, J. Bastiaensens, Proc. Soc. Photo-Opt. Instrum. Eng. 1027, 35 (1988).
  2. P. Muys, P. Sona, Laser Mag. (April1989), p. 38.
  3. S. de Silvestri, P. Laporta, V. Magni, O. Svelto, IEEE J. Quantum Electron. 24, 1172 (1988).
    [CrossRef]
  4. H. Hügel, Proc. Soc. Photo-Opt. Instrum. Eng. 650, 2 (1986).

1988 (2)

P. Muys, J. Bastiaensens, Proc. Soc. Photo-Opt. Instrum. Eng. 1027, 35 (1988).

S. de Silvestri, P. Laporta, V. Magni, O. Svelto, IEEE J. Quantum Electron. 24, 1172 (1988).
[CrossRef]

1986 (1)

H. Hügel, Proc. Soc. Photo-Opt. Instrum. Eng. 650, 2 (1986).

Bastiaensens, J.

P. Muys, J. Bastiaensens, Proc. Soc. Photo-Opt. Instrum. Eng. 1027, 35 (1988).

de Silvestri, S.

S. de Silvestri, P. Laporta, V. Magni, O. Svelto, IEEE J. Quantum Electron. 24, 1172 (1988).
[CrossRef]

Hügel, H.

H. Hügel, Proc. Soc. Photo-Opt. Instrum. Eng. 650, 2 (1986).

Laporta, P.

S. de Silvestri, P. Laporta, V. Magni, O. Svelto, IEEE J. Quantum Electron. 24, 1172 (1988).
[CrossRef]

Magni, V.

S. de Silvestri, P. Laporta, V. Magni, O. Svelto, IEEE J. Quantum Electron. 24, 1172 (1988).
[CrossRef]

Muys, P.

P. Muys, J. Bastiaensens, Proc. Soc. Photo-Opt. Instrum. Eng. 1027, 35 (1988).

P. Muys, P. Sona, Laser Mag. (April1989), p. 38.

Sona, P.

P. Muys, P. Sona, Laser Mag. (April1989), p. 38.

Svelto, O.

S. de Silvestri, P. Laporta, V. Magni, O. Svelto, IEEE J. Quantum Electron. 24, 1172 (1988).
[CrossRef]

IEEE J. Quantum Electron. (1)

S. de Silvestri, P. Laporta, V. Magni, O. Svelto, IEEE J. Quantum Electron. 24, 1172 (1988).
[CrossRef]

Proc. Soc. Photo-Opt. Instrum. Eng. (2)

H. Hügel, Proc. Soc. Photo-Opt. Instrum. Eng. 650, 2 (1986).

P. Muys, J. Bastiaensens, Proc. Soc. Photo-Opt. Instrum. Eng. 1027, 35 (1988).

Other (1)

P. Muys, P. Sona, Laser Mag. (April1989), p. 38.

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Figures (3)

Fig. 1
Fig. 1

The super-Gaussian reflectivity profile.

Fig. 2
Fig. 2

Transverse variation of the intensity gain.

Fig. 3
Fig. 3

Intensity distribution of the VRM cavity: (a) the near field (8 cm from the output coupler), (b) the far field, (c) comparison between the experimental (solid curve) and the computed (dashed curve) profiles.

Equations (1)

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R ( r ) = R 0 exp [ 2 ( r / w m ) n ] ( n > 2 ) .

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