OSA's Digital Library

Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 33 — Nov. 20, 2012
  • pp: 7953–7961

Precision in ground-based solar polarimetry: simulating the role of adaptive optics

Nagaraju Krishnappa and Alex Feller  »View Author Affiliations


Applied Optics, Vol. 51, Issue 33, pp. 7953-7961 (2012)
http://dx.doi.org/10.1364/AO.51.007953


View Full Text Article

Acrobat PDF (872 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

Accurate measurement of polarization in spectral lines is important for the reliable inference of magnetic fields on the Sun. For ground-based observations, polarimetric precision is severely limited by the presence of Earth’s atmosphere. Atmospheric turbulence (seeing) produces signal fluctuations, which combined with the nonsimultaneous nature of the measurement process cause intermixing of the Stokes parameters known as seeing-induced polarization cross talk. Previous analysis of this effect [Appl. Opt.43, 3817 (2004)] suggests that cross talk is reduced not only with increase in modulation frequency but also by compensating the seeing-induced image aberrations by an adaptive optics (AO) system. However, in those studies the effect of higher-order image aberrations than those corrected by the AO system was not taken into account. We present in this paper an analysis of seeing-induced cross talk in the presence of higher-order image aberrations through numerical simulation. In this analysis we find that the amount of cross talk among Stokes parameters is practically independent of the degree of image aberration corrected by an AO system. However, higher-order AO corrections increase the signal-to-noise ratio by reducing the seeing caused image smearing. Further we find, in agreement with the earlier results, that cross talk is reduced considerably by increasing the modulation frequency.

© 2012 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.5410) Instrumentation, measurement, and metrology : Polarimetry

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: April 24, 2012
Revised Manuscript: August 28, 2012
Manuscript Accepted: October 22, 2012
Published: November 19, 2012

Citation
Nagaraju Krishnappa and Alex Feller, "Precision in ground-based solar polarimetry: simulating the role of adaptive optics," Appl. Opt. 51, 7953-7961 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-33-7953


Sort:  Author  |  Year  |  Journal  |  Reset

References

  1. B. W. Lites, “Rotating waveplates as polarization modulators for Stokes polarimetry of the sun—Evaluation of seeing-induced crosstalk errors,” Appl. Opt. 26, 3838–3845 (1987). [CrossRef]
  2. P. G. Judge, D. F. Elmore, B. W. Lites, C. U. Keller, and T. Rimmele, “Evaluation of seeing-induced cross talk in tip-tilt-corrected solar polarimetry,” Appl. Opt. 43, 3817–3828 (2004). [CrossRef]
  3. K. Nagaraju, A. Feller, S. Ihle, and H. Soltau, “Atmospheric turbulence and high-precision ground-based solar polarimetry,” Proc. SPIE 8148, 81480S (2011). [CrossRef]
  4. F. Roddier, Adaptive Optics in Astronomy (Cambridge University, 1999).
  5. B. L. McGlamery, “Computer simulation studies of compensation of turbulence degraded images,” Proc. SPIE 74, 225–233 (1976). [CrossRef]
  6. R. G. Lane, A. Glindemann, and J. C. Dainty, “Simulation of a Kolmogorov phase screen,” Waves Random Media 2, 209–224 (1992). [CrossRef]
  7. A. Glindemann, R. G. Lane, and J. C. Dainty, “Simulation of time-evolving speckle patterns using Kolmogorov statistics,” J. Mod. Opt. 40, 2381–2388 (1993). [CrossRef]
  8. F. Roddier, M. J. Northcott, J. E. Graves, D. L. McKenna, and D. Roddier, “One-dimensional spectra of turbulence-induced Zernike aberrations: time-delay and isoplanicity error in partial adaptive compensation,” J. Opt. Soc. Am. A 10, 957–965 (1993). [CrossRef]
  9. H. Socas-Navarro, “Stokes inversion techniques: recent achievements and future horizons,” in Advanced Solar Polarimetry—Theory, Observation, and Instrumentation, M. Sigwarth, ed., Vol. 236 of Astronomical Society of the Pacific Conference Series (Astronomical Society of the Pacific, 2001), pp. 487–501.
  10. A. Vögler and M. Schüssler, “Studying magneto-convection by numerical simulation,” Astron. Nachr. 324, 399–404 (2003). [CrossRef]
  11. A. Vögler, “Effects of non-grey radiative transfer on 3D simulations of solar magneto-convection,” Astron. Astrophys. 421, 755–762 (2004). [CrossRef]
  12. A. Vögler, S. Shelyag, M. Schüssler, F. Cattaneo, T. Emonet, and T. Linde, “Simulations of magneto-convection in the solar photosphere. Equations, methods, and results of the MURaM code,” Astron. Astrophys. 429, 335–351 (2005). [CrossRef]
  13. R. J. Noll, “Zernike polynomials and atmospheric turbulence,” J. Opt. Soc. Am. 66, 207–211 (1976). [CrossRef]
  14. A. H. Stroud, Approximate Calculation of Multiple Integrals (Prentice-Hall, 1971).
  15. F. Roddier, Adaptive Optics in Astronomy (Cambridge University, 1999).
  16. P. Holoborodko, www.holoborodko.com .
  17. M. Northcott, Performance Estimation and System Modeling in Adaptive Optics in Astronomy (Cambridge University, 1999), p. 155.
  18. C. U. Keller, J. W. Harvey, and M. S. Giampapa, “SOLIS: an innovative suite of synoptic instruments,” Proc. SPIE 4853, 194–204 (2003). [CrossRef]
  19. J. O. Stenflo, “Solar magnetic and velocity-field measurements: new instrument concepts,” Appl. Opt. 23, 1267–1278 (1984). [CrossRef]
  20. C. Beck, W. Schmidt, T. Kentischer, and D. Elmore, “Polarimetric Littrow spectrograph—instrument calibration and first measurements,” Astron. Astrophys. 437, 1159–1167 (2005). [CrossRef]
  21. K. Nagaraju, K. B. Ramesh, K. Sankarasubramanian, and K. E. Rangarajan, “An efficient modulation scheme for dual beam polarimetry,” Bull. Astron. Soc. India 35, 307–318 (2007).
  22. D. P. Greenwood, “Bandwidth specification for adaptive optics systems,” J. Opt. Soc. Am. 67, 390–393 (1977). [CrossRef]
  23. J. W. Hardy, Adaptive Optics for Astronomical Telescopes(Oxford University, 1998).
  24. T. R. Rimmele, S. L. Keil, C. U. Keller, F. Hill, J. Briggs, N. E. Dalrymple, B. D. Goodrich, S. L. Hegwer, R. Hubbard, J. M. Oschmann, R. R. Radick, D. Ren, J. Wagner, S. Wampler, and M. Warner, “Technical challenges of the advanced technology solar telescope,” Proc. SPIE 4837, 94–109 (2003). [CrossRef]

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.


« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited