Automated determination of best focus and minimization of optical path difference in Linnik white light interferometry

2011 ◽  
Vol 50 (30) ◽  
pp. 5861 ◽  
Author(s):  
Jingtao Dong ◽  
Rongsheng Lu ◽  
Yong Li ◽  
Kui Wu
Keyword(s):  
White Light ◽  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
White Light Interferometry ◽  
Automated Determination

Determination of Optical Path Difference of White Light Fibre Interferometer Using Peak Tracking Method

2014 ◽  
Vol 71 (5) ◽  
Author(s):  
Ley Hood Hong ◽  
Asiah Yahaya ◽  
Yusof Munajat
Keyword(s):  
Light Source ◽  
White Light ◽  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
White Led ◽  
Tracking Method ◽  
Peak Tracking ◽  
Wavelength Resolution

The aim of this paper is to evaluate the peak tracking method for determination of optical path difference of a fibre interferometer. This study narros the scope for Mach-Zehnder configuration with neutral white LED as its light source. The peak tracking method is then applied on the interference spectrum recorded from the output port of the interferometer using a spectrometer, allowing the optical path difference to be computed. Accuracy of this method is greatly affected by the wavelength resolution of the detector, where the uncertainty of the result is smaller with higher wavelength resolution and the maximum measurable path difference was found to be about 0.6 mm.  

Video-Based Interferogram Analysis for Measuring Influence of Vibration to White Light Interferometry

2010 ◽  
Vol 447-448 ◽  
pp. 599-603
Author(s):  
Wee Keat Chong ◽  
Xiang Li ◽  
Sardha Wijesoma
Keyword(s):  
White Light ◽  
Vibration Isolation ◽  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
Isolation System ◽  
Vibration Isolation System ◽  
White Light Interferometer ◽  
Vibration Pattern ◽  
Measurement Principle

In this paper, we present a video-based interferogram analysis method for measuring the influence of vibration on white light interferometer in terms of undesired change in optical path difference between reference and sample arms. The measurement principle is based on the analysis of interferograms which involves tracking and converting change in interferograms to physical change in optical path difference. The method proposed uses the original sensor in interferometer for data acquisition as such no additional hardware is required. Such an approach ensures that the properties of interferometer such as the bandwidth of sensor are considered and the vibration pattern recorded is close to the effective influence of vibration. With our method, the influence of vibration on white light interferometer and the performance of vibration isolation system can be objectively quantified and measured.

scholarly journals Determination of Nonlinear Refractive Index of Zinc Phthalocyanine by Pump Induced Fizeau Interferometry

2019 ◽  
Vol 69 (1) ◽  
pp. 27-30
Author(s):  
Anil Kumar ◽  
M. P. Singh ◽  
Devendra Mohan ◽  
A. K. Gupta
Keyword(s):  
Refractive Index ◽  
Optical Path Difference ◽  
Path Difference ◽  
Specific Region ◽  
Optical Path ◽  
Zinc Phthalocyanine ◽  
Fizeau Interferometer ◽  
Linearly Polarized ◽  
Intense Light

Experimental measurement of intense light induced refractive index is demonstrated using Fizeau interferometer. Refractive index is induced in a specific region of the sample with intense light pulse of a linearly polarized, Q- switched Nd:YAG laser at 1064nm wavelength. The respective change in optical path difference (OPD) is measured using Fizeau interferometer. The OPD so obtained is mapped in terms of change in refractive index in the area of interaction of pump beam and sample. The measured induced refractive index is then used to calculate thermo-optic coefficient of the ZnPc embedded polymeric sample.

scholarly journals Robust determination of optical path difference: fringe tracking at the Infrared Optical Telescope Array interferometer

2005 ◽  
Vol 44 (25) ◽  
pp. 5173 ◽  
Author(s):  
Ettore Pedretti ◽  
Wesley A. Traub ◽  
John D. Monnier ◽  
Rafael Millan-Gabet ◽  
Nathaniel P. Carleton ◽  
...  
Keyword(s):  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
Optical Telescope ◽  
Telescope Array ◽  
Fringe Tracking

Rhombic optical path difference bias white light interferometric fiber-optic gyroscope

2021 ◽  
Vol 46 (6) ◽  
pp. 1502
Author(s):  
Ang Li ◽  
Zhenguo Jing ◽  
Qiang Liu ◽  
Yueying Liu ◽  
Yang Cheung ◽  
...  
Keyword(s):  
White Light ◽  
Fiber Optic ◽  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
Fiber Optic Gyroscope

scholarly journals Determination of microrelief of the sample by singular beams superposition

2019 ◽  
Vol 43 (5) ◽  
pp. 741-746
Keyword(s):  
Cross Section ◽  
Topological Charge ◽  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
Sample Thickness ◽  
Phase Sensitivity ◽  
Rotational Angle ◽  
Time Determination

In present paper we propose easy way to implement method of interfering vortices with opposite topological charge for the real time determination of the thickness and information about the surface of studied samples with the resolution up to 7 nanometers. The determination of the characteristics of the medial cross-section of submicron-objects becomes possible due to phase sensitivity of interfering singular beams to the slightest changes in the optical path difference between them. The dependence of rotational angle of resulting interference pattern in case of different sample thickness for two singular beams superposition is considered in detail.

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