Optical vortex position detection with a Shack-Hartmann wavefront sensor using extended closed contour method

Hongxin Huang; Jia Luo; Yoshinori Matsui; Haruyoshi Toyoda; Takashi Inoue

doi:10.1117/12.2078471

10 March 2015 Optical vortex position detection with a Shack-Hartmann wavefront sensor using extended closed contour method

Hongxin Huang, Jia Luo, Yoshinori Matsui, Haruyoshi Toyoda, Takashi Inoue

Author Affiliations +

Proceedings Volume 9379, Complex Light and Optical Forces IX; 93790J (2015) https://doi.org/10.1117/12.2078471
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

We propose a new method, based on Shack-Hartmann wavefront sensor (SH-WFS), to achieve high-accuracy position detection of phase singular points of optical vortex (OV) beam. The method calculates evaluation values related to phase slopes of incoming wavefront from Hartmanngram recorded by SH-WFS, and then determines precisely the position of the singular points by calculating the centroid of the 3x3-evaluation-value distribution centered at peak position. A main point is that, in evaluation-value calculation, we use a closed contour connecting the centers of 8-connected, instead of 2x2, lenslet apertures. Theoretical analysis shows that the measurement errors can be greatly reduced in comparison to that of 2x2 closed contour. Proof experiments were performed to confirm its accuracy by measuring singular points of OV beams generated by a liquid crystal on silicon spatial light modulator. The root-mean-square error of the measured position of singular points was approximately 0.052, in units of the lens size of lenslet array used in the SH-WFS. The method achieves fast-speed and sub-lens size spatial resolution detection, is suitable for real-time control applications.

Citation Download Citation

Hongxin Huang, Jia Luo, Yoshinori Matsui, Haruyoshi Toyoda, and Takashi Inoue "Optical vortex position detection with a Shack-Hartmann wavefront sensor using extended closed contour method", Proc. SPIE 9379, Complex Light and Optical Forces IX, 93790J (10 March 2015); https://doi.org/10.1117/12.2078471

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
9 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Spiral phase plates

Wavefront sensors

Optical vortices

Liquid crystal on silicon

Phase measurement

Beam splitters

Error analysis

Show All Keywords

Keywords/Phrases

Search In:

Publication Years