Improved second-harmonic two-wavelength interferometer with refractive index correction without effect modulation

Bernd Bodermann; Jens Flugge; Karl Meiners-Hagen

doi:10.1117/12.509868

20 November 2003 Improved second-harmonic two-wavelength interferometer with refractive index correction without effect modulation

Bernd Bodermann, Jens Flugge, Karl Meiners-Hagen

Author Affiliations +

Proceedings Volume 5190, Recent Developments in Traceable Dimensional Measurements II; (2003) https://doi.org/10.1117/12.509868
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

Refractive index fluctuations due to changing environmental conditions or due to air turbulence can significantly influence the measurement uncertainty of interferometric length measurements in air ambiance. A two wavelength interferometer is to some extend capable of measuring synchronously a path difference and the integral refractive index along this path difference. The best performance is achieved using two harmonically correlated optical fields like in a second harmonic interferometer. We developed a new type of a second harmonic two wavelength interferometer based on a double heterodyne interferometer with electronic frequency multiplication of one heterodyne frequency. The optical setup of the interferometer uses a measurement and a reference interferometer, both with spatially separated measurement and reference beam to avoid optical nonlinearities and reduce the influence of mechanical vibrations. The phase difference between measurement and reference interferometer is kept constant which reduces possible nonlinearities of the phase analysis. The system is capable of measuring the integral index of refraction without any effect modulation like e.g. a variation of the path difference which makes the design also applicable for absolute measuring interferometry. First experimental results will be presented

Citation Download Citation

Bernd Bodermann, Jens Flugge, and Karl Meiners-Hagen "Improved second-harmonic two-wavelength interferometer with refractive index correction without effect modulation", Proc. SPIE 5190, Recent Developments in Traceable Dimensional Measurements II, (20 November 2003); https://doi.org/10.1117/12.509868

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