Compact digital holoscope with dual wavelength

Jianglei Di; Jianlin Zhao; Anand Asundi

doi:10.1117/12.2001862

27 November 2012 Compact digital holoscope with dual wavelength

Jianglei Di, Jianlin Zhao, Anand Asundi

Proceedings Volume 8559, Information Optics and Optical Data Storage II; 855908 (2012) https://doi.org/10.1117/12.2001862
Event: Photonics Asia, 2012, Beijing, China

Abstract

Digital holography allows fast, nondestructive, full-field 3D measurement of reflecting as well as transmitting objects. It is a well-established two-step method of digital recording and numerical reconstruction of the full complex field of wavefront. It has found applications in diverse fields, such as micro-optics and MEMS metrology, cell imaging and particle characterization. However, for quantitative phase measurement there is 2π by phase ambiguities that limit measurements of optical path lengths to the wavelength of the illumination light. For continuous profiles, phase unwrapping is used to overcome the phase jumps. One approach is to use a synthetic wavelength using two lasers with different wavelengths. This synthetic wavelength would depend on the wavelengths of the two sources and thus can be tuned by selecting appropriate sources. In this paper, this concept is integrated into the compact digital holoscope which provides the system with the capability of measuring over a range of step heights from the nanometer to the micrometer realm. Applications of the system for reflecting geometries is discussed.

Citation Download Citation

Jianglei Di, Jianlin Zhao, and Anand Asundi "Compact digital holoscope with dual wavelength", Proc. SPIE 8559, Information Optics and Optical Data Storage II, 855908 (27 November 2012); https://doi.org/10.1117/12.2001862

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