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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 10 — Apr. 1, 2001
  • pp: 1599–1608

High-Dispersion Spherical Holographic Gratings in a Modified Rowland Mounting

Michel Duban  »View Author Affiliations


Applied Optics, Vol. 40, Issue 10, pp. 1599-1608 (2001)
http://dx.doi.org/10.1364/AO.40.001599


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Abstract

For holographic gratings requiring an extreme dispersion, I consider a modified Rowland mounting, in which the recording laser sources are moved away from the grating, to reduce the uncorrected higher-order aberrations. In addition, I choose the geometric parameters such that first-type coma is corrected. Then a plane multimode deformable mirror (MDM) or two auxiliary spherical holographic gratings (R3 device) are used to aberrate the grating’s recording sources; correction up to the fourth order is sufficient to obtain high image quality. Applied to the FUSE–Lyman (FUSE is Far Ultraviolet Spectroscopic Explorer) grating, with a groove density as high as 5767 grooves/mm, these recording devices produce a resolution (chromatic resolving power) as great as 611,000 with the MDM and 3,030,000 with the R3 device. These results far exceed the specified performance of 30,000. Since diffraction limits the resolution to 482,000, the images are diffraction limited with both devices.

© 2001 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(050.7330) Diffraction and gratings : Volume gratings
(220.1010) Optical design and fabrication : Aberrations (global)

Citation
Michel Duban, "High-Dispersion Spherical Holographic Gratings in a Modified Rowland Mounting," Appl. Opt. 40, 1599-1608 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-10-1599


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References

  1. M. Duban, “Theory of spherical holographic gratings recorded by use of a multimode deformable mirror,” Appl. Opt. 37, 7209–7213 (1998).
  2. G. R. Lemaître and M. Wang, “Active mirrors warped using Zernike polynomials for correcting off-axis aberrations of fixed primary mirrors. I. Theory and elasticity design,” Astron. Astrophys. Suppl. Ser. 114, 373 (1995).
  3. M. Duban, “Third-generation Rowland holographic mounting,” Appl. Opt. 30, 4019–4025 (1991).
  4. M. Duban, “Third-generation holographic Rowland mounting: fourth-order theory,” Appl. Opt. 38, 3443–3449 (1999).
  5. M. Duban, K. Dohlen, and G. R. Lemaître, “Illustration of the use of multimode deformable plane mirrors to record high-resolution concave gratings: results for the Cosmic Origins Spectrograph gratings of the Hubble Space Telescope,” Appl. Opt. 37, 7214–7217 (1998).
  6. G. Lemaître and M. Duban, “A general method of holographic grating recording with a null-powered multimode deformable mirror,” Astron. Astrophys. 339, L89–L93 (1998).
  7. M. Duban, “Theory and computation of three Cosmic Origin Spectrograph aspheric gratings recorded with a multimode deformable mirror,” Appl. Opt. 38, 1096–1102 (1999).
  8. M. Duban, “Recording high-dispersion spherical holographic gratings in a modified Rowland mounting by use of a multimode deformable mirror,” Appl. Opt. 39, 16–19 (2000).
  9. See the following URL: http://violet.pha.jhu.edu/papers/papers.html.
  10. M. Duban, “Holographic aspheric gratings printed with aberrant waves,” Appl. Opt. 26, 4263–4273 (1987).
  11. R. Grange, “Aberration-reduced holographic spherical gratings for Rowland circle spectrographs,” Appl. Opt. 31, 3744–3749 (1992).
  12. R. Grange, “Holographic spherical gratings: a new family of quasi-stigmatic designs for the Rowland-circle mounting,” Appl. Opt. 32, 4875–4880 (1993).

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