Abstract

Time-resolved M2 numerical computation and experimental measurements of nanosecond pulses from a Q-switched variable-reflectivity-mirror Nd:YAG laser are presented for the first time to our knowledge. The beam quality parameter is seen to vary approximately from 1 at the beginning to 2 at the end of a high-energy pulse, with a value of 1.35 at the peak of the pulse, which also corresponds to the M2 obtained from the time-averaged detection of the pulse profile.

© 1992 Optical Society of America

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References

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  1. VRM’s have been applied mainly in conjunction with unstable resonators. See, for example, G. Giuliani, Y. K. Park, R. L. Byer, Opt. Lett. 5, 491 (1980); N. McCarthy, P. Lavigne, Opt. Lett. 10, 553 (1985).
    [CrossRef] [PubMed]
  2. For example, computer code PARAXIA, version 1.0, Software Distribution Center, Stanford University, Stanford, Calif. (1991).
  3. Preliminary results were presented by A. Caprara, G. C. Reali, A. Tomaselli, in Digest of Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1991), paper CThD2.
  4. A. E. Siegman, Proc. Soc. Photo-Opt. Instrum. Eng. 1224, 1 (1990).
  5. A. E. Siegman, Lasers (University Science, Mill Valley, Calif., 1986).

1990

A. E. Siegman, Proc. Soc. Photo-Opt. Instrum. Eng. 1224, 1 (1990).

1980

Byer, R. L.

Caprara, A.

Preliminary results were presented by A. Caprara, G. C. Reali, A. Tomaselli, in Digest of Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1991), paper CThD2.

Giuliani, G.

Park, Y. K.

Reali, G. C.

Preliminary results were presented by A. Caprara, G. C. Reali, A. Tomaselli, in Digest of Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1991), paper CThD2.

Siegman, A. E.

A. E. Siegman, Proc. Soc. Photo-Opt. Instrum. Eng. 1224, 1 (1990).

A. E. Siegman, Lasers (University Science, Mill Valley, Calif., 1986).

Tomaselli, A.

Preliminary results were presented by A. Caprara, G. C. Reali, A. Tomaselli, in Digest of Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1991), paper CThD2.

Opt. Lett.

Proc. Soc. Photo-Opt. Instrum. Eng.

A. E. Siegman, Proc. Soc. Photo-Opt. Instrum. Eng. 1224, 1 (1990).

Other

A. E. Siegman, Lasers (University Science, Mill Valley, Calif., 1986).

For example, computer code PARAXIA, version 1.0, Software Distribution Center, Stanford University, Stanford, Calif. (1991).

Preliminary results were presented by A. Caprara, G. C. Reali, A. Tomaselli, in Digest of Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1991), paper CThD2.

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Figures (3)

Fig. 1
Fig. 1

(a) Theoretical calculated time–space intensity three-dimensional plot of the output pulse that corresponds to a stored energy of 0.3 J. (b) Experimental measured intensity three-dimensional plot under the same pump conditions as in (a).

Fig. 2
Fig. 2

Sequence of space–time measurements to get M2. The space–time intensity profiles are of different propagation distances after the beam passes a +0.33-diopter focusing lens.

Fig. 3
Fig. 3

Power profile and M2 time history of the ensemble of the pulses. The stored energy is 275 mJ.

Equations (2)

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R ( r ) = R 0 exp [ 2 ( r w m ) 2 ] ,
σ x 2 ( z ) = σ x 2 ( z 0 ) + M x 4 λ 2 16 π 2 σ x 2 ( z 0 ) ,

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