Abstract

Previous methods of predicting focal spot parameters such as the Strehl ratio and encircled energy of large laser systems like the Los Alamos fusion CO2 lasers involved the digitization of interference patterns of the optical components and propagation of the complex amplitude and phase of the wave front throughout the system. In the new approach described in this paper, the computational procedure has been extended to produce computer plots of the final emerging wave front. This enables direct comparison with the experimentally produced wave front of the total system and opens the way for optical analysis, design, and possible optimization of laser systems, especially CO2 laser systems. The computational procedure and the Twyman-Green and Smartt IR interferometers constructed to verify this approach are described. The implications of the results are discussed.

© 1980 Optical Society of America

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  1. Gemini and Helios are, respectively, the two- and eight-beam laser fusion systems currently operational at Los Alamos.
  2. cdfl, computer-determined fringe locator, a program developed by W.S.Hall of LASL.
  3. An excellent description of the Zernike polynomials is given byM. Born, E. Wolf, Principles of Optics (Pergamon, New York, 1975).
  4. fringe is an interferogram reduction program developed by J. Loomis while at the U. Arizona, Optical Sciences Center.
  5. lots, laser optical transport system, developed by G. Lawrence while at the U. Arizona, Optical Sciences Center, in conjunction with LASL, Laser Division.
  6. V. K. Viswanathan, P. D. Bolen, Proc. Soc. Photo-Opt. Instrum. Eng. 179, 107 (1979).
  7. V. K. Viswanathan, Proc. Soc. Photo-Opt. Instrum. Eng. 147, 183 (1978).
  8. O. Kwan, J. C. Wyant, C. R. Hayslett, J. Opt. Soc. Am. 67, 1365A (1977).
  9. V. K. Viswanathan, R. B. Hammond, I. Liberman, B. D. Seery, A. Gibbs, P. D. Bolen, J. Opt. Soc. Am. 69, 1454A(1979).
  10. C. O. Koliopoulos, O. Kwan, R. Shagum, J. C. Wyant, C. R. Hayslett, Opt. Lett. 3, 118 (1978).
    [CrossRef] [PubMed]
  11. M. D. Montgomery et al., in Digest of Topical Meeting on Inertial Confinement Fusion (Optical Society of America, Washington, D.C., 1978), paper TuC3.
  12. V. K. Viswanathan, J. Sollid, W. S. Hall, I. Liberman, G. Lawrence, Am. Soc. Test. Mater. Spec. Tech. Publ. 666 (1978), p. 98.
  13. I. Liberman, in Digest of Topical Meeting on Inertial Confinement Fusion (Optical Society of America, Washington, D.C., 1980), paper TUB10.
  14. J. V. Parker, I. Liberman, V. K. Viswanathan, in Digest of Topical Meeting on Inertial Confinement Fusion (Optical Society of America, Washington, D.C., 1978), paper ThD13.

1979 (2)

V. K. Viswanathan, P. D. Bolen, Proc. Soc. Photo-Opt. Instrum. Eng. 179, 107 (1979).

V. K. Viswanathan, R. B. Hammond, I. Liberman, B. D. Seery, A. Gibbs, P. D. Bolen, J. Opt. Soc. Am. 69, 1454A(1979).

1978 (3)

V. K. Viswanathan, J. Sollid, W. S. Hall, I. Liberman, G. Lawrence, Am. Soc. Test. Mater. Spec. Tech. Publ. 666 (1978), p. 98.

C. O. Koliopoulos, O. Kwan, R. Shagum, J. C. Wyant, C. R. Hayslett, Opt. Lett. 3, 118 (1978).
[CrossRef] [PubMed]

V. K. Viswanathan, Proc. Soc. Photo-Opt. Instrum. Eng. 147, 183 (1978).

1977 (1)

O. Kwan, J. C. Wyant, C. R. Hayslett, J. Opt. Soc. Am. 67, 1365A (1977).

Bolen, P. D.

V. K. Viswanathan, R. B. Hammond, I. Liberman, B. D. Seery, A. Gibbs, P. D. Bolen, J. Opt. Soc. Am. 69, 1454A(1979).

V. K. Viswanathan, P. D. Bolen, Proc. Soc. Photo-Opt. Instrum. Eng. 179, 107 (1979).

Born, M.

An excellent description of the Zernike polynomials is given byM. Born, E. Wolf, Principles of Optics (Pergamon, New York, 1975).

Gibbs, A.

V. K. Viswanathan, R. B. Hammond, I. Liberman, B. D. Seery, A. Gibbs, P. D. Bolen, J. Opt. Soc. Am. 69, 1454A(1979).

Hall, W. S.

V. K. Viswanathan, J. Sollid, W. S. Hall, I. Liberman, G. Lawrence, Am. Soc. Test. Mater. Spec. Tech. Publ. 666 (1978), p. 98.

Hammond, R. B.

V. K. Viswanathan, R. B. Hammond, I. Liberman, B. D. Seery, A. Gibbs, P. D. Bolen, J. Opt. Soc. Am. 69, 1454A(1979).

Hayslett, C. R.

Koliopoulos, C. O.

Kwan, O.

Lawrence, G.

V. K. Viswanathan, J. Sollid, W. S. Hall, I. Liberman, G. Lawrence, Am. Soc. Test. Mater. Spec. Tech. Publ. 666 (1978), p. 98.

Liberman, I.

V. K. Viswanathan, R. B. Hammond, I. Liberman, B. D. Seery, A. Gibbs, P. D. Bolen, J. Opt. Soc. Am. 69, 1454A(1979).

V. K. Viswanathan, J. Sollid, W. S. Hall, I. Liberman, G. Lawrence, Am. Soc. Test. Mater. Spec. Tech. Publ. 666 (1978), p. 98.

I. Liberman, in Digest of Topical Meeting on Inertial Confinement Fusion (Optical Society of America, Washington, D.C., 1980), paper TUB10.

J. V. Parker, I. Liberman, V. K. Viswanathan, in Digest of Topical Meeting on Inertial Confinement Fusion (Optical Society of America, Washington, D.C., 1978), paper ThD13.

Montgomery, M. D.

M. D. Montgomery et al., in Digest of Topical Meeting on Inertial Confinement Fusion (Optical Society of America, Washington, D.C., 1978), paper TuC3.

Parker, J. V.

J. V. Parker, I. Liberman, V. K. Viswanathan, in Digest of Topical Meeting on Inertial Confinement Fusion (Optical Society of America, Washington, D.C., 1978), paper ThD13.

Seery, B. D.

V. K. Viswanathan, R. B. Hammond, I. Liberman, B. D. Seery, A. Gibbs, P. D. Bolen, J. Opt. Soc. Am. 69, 1454A(1979).

Shagum, R.

Sollid, J.

V. K. Viswanathan, J. Sollid, W. S. Hall, I. Liberman, G. Lawrence, Am. Soc. Test. Mater. Spec. Tech. Publ. 666 (1978), p. 98.

Viswanathan, V. K.

V. K. Viswanathan, R. B. Hammond, I. Liberman, B. D. Seery, A. Gibbs, P. D. Bolen, J. Opt. Soc. Am. 69, 1454A(1979).

V. K. Viswanathan, P. D. Bolen, Proc. Soc. Photo-Opt. Instrum. Eng. 179, 107 (1979).

V. K. Viswanathan, Proc. Soc. Photo-Opt. Instrum. Eng. 147, 183 (1978).

V. K. Viswanathan, J. Sollid, W. S. Hall, I. Liberman, G. Lawrence, Am. Soc. Test. Mater. Spec. Tech. Publ. 666 (1978), p. 98.

J. V. Parker, I. Liberman, V. K. Viswanathan, in Digest of Topical Meeting on Inertial Confinement Fusion (Optical Society of America, Washington, D.C., 1978), paper ThD13.

Wolf, E.

An excellent description of the Zernike polynomials is given byM. Born, E. Wolf, Principles of Optics (Pergamon, New York, 1975).

Wyant, J. C.

Am. Soc. Test. Mater. Spec. Tech. Publ. (1)

V. K. Viswanathan, J. Sollid, W. S. Hall, I. Liberman, G. Lawrence, Am. Soc. Test. Mater. Spec. Tech. Publ. 666 (1978), p. 98.

J. Opt. Soc. Am. (2)

O. Kwan, J. C. Wyant, C. R. Hayslett, J. Opt. Soc. Am. 67, 1365A (1977).

V. K. Viswanathan, R. B. Hammond, I. Liberman, B. D. Seery, A. Gibbs, P. D. Bolen, J. Opt. Soc. Am. 69, 1454A(1979).

Opt. Lett. (1)

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

V. K. Viswanathan, P. D. Bolen, Proc. Soc. Photo-Opt. Instrum. Eng. 179, 107 (1979).

V. K. Viswanathan, Proc. Soc. Photo-Opt. Instrum. Eng. 147, 183 (1978).

Other (8)

M. D. Montgomery et al., in Digest of Topical Meeting on Inertial Confinement Fusion (Optical Society of America, Washington, D.C., 1978), paper TuC3.

Gemini and Helios are, respectively, the two- and eight-beam laser fusion systems currently operational at Los Alamos.

cdfl, computer-determined fringe locator, a program developed by W.S.Hall of LASL.

An excellent description of the Zernike polynomials is given byM. Born, E. Wolf, Principles of Optics (Pergamon, New York, 1975).

fringe is an interferogram reduction program developed by J. Loomis while at the U. Arizona, Optical Sciences Center.

lots, laser optical transport system, developed by G. Lawrence while at the U. Arizona, Optical Sciences Center, in conjunction with LASL, Laser Division.

I. Liberman, in Digest of Topical Meeting on Inertial Confinement Fusion (Optical Society of America, Washington, D.C., 1980), paper TUB10.

J. V. Parker, I. Liberman, V. K. Viswanathan, in Digest of Topical Meeting on Inertial Confinement Fusion (Optical Society of America, Washington, D.C., 1978), paper ThD13.

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Figures (6)

Fig. 1
Fig. 1

Schematic of Twyman-Green IR interferometer.

Fig. 2
Fig. 2

Schematic of apparatus for Smartt interferometer. (Pyroelectric should read pyroelectric.)

Fig. 3
Fig. 3

Twyman-Green interferograms. Left interferogram was obtained experimentally; right interferogram was computed generated.

Fig. 4
Fig. 4

Smartt interferograms. Left interferogram was obtained experimentally; right interferogram was computer generated.

Fig. 5
Fig. 5

Optical schematic of a single Helios beamline.

Fig. 6
Fig. 6

Application of Smartt interferometry to Helios in conjunction with a hole grating.

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