Aliasing in a Hartmann wavefront sensor at x-ray wavelengths

Lisa A. Poyneer; Brian Bauman; Bruce Macintosh

doi:10.1117/12.946116

15 October 2012 Aliasing in a Hartmann wavefront sensor at x-ray wavelengths

Lisa A. Poyneer, Brian Bauman, Bruce Macintosh

Proceedings Volume 8503, Adaptive X-Ray Optics II; 85030I (2012) https://doi.org/10.1117/12.946116
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

The Hartmann Sensor is a simple and well-established method to interrogate wavefront quality. Recently the Hartmann sensor has been used at very short wavelengths, including the extreme UV. Here we consider the Hartmann sensor and its ability to measure the wavefront of an x-ray beam. We use both analytic methods and a wave-optics, Fresnel-diffraction simulation. The Hartmann sensor samples the wavefront, which means that it is susceptible to aliasing (the non-linear phenomenon where high-spatial frequency components are incorrectly measured as low-spatial frequency components). Our analysis shows that aliasing is more severe in the Hartmann sensor than in the corresponding (optical) Shack-Hartmann. Aliasing worsens as Hartmann hole size shrinks. The wave-optics simulations show that for reasonable optics-polishing errors and Hartmann mask design, aliasing errors can be of the same magnitude as the phase that is to be measured.

Citation Download Citation

Lisa A. Poyneer, Brian Bauman, and Bruce Macintosh "Aliasing in a Hartmann wavefront sensor at x-ray wavelengths", Proc. SPIE 8503, Adaptive X-Ray Optics II, 85030I (15 October 2012); https://doi.org/10.1117/12.946116

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available