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Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
Active control of grating interferometers for extended-range low-noise operation
Omkar Karhade1, Levent Degertekin, Thomas Kurfess
1School of Mechanical Engineering, Georgia Institute of Technology, 801 Ferst Drive, Atlanta, Georgia 30318, USA. omkar.karhade@intel.com
Optics Letters
|October 2, 2009
Summary
A new active control method enhances grating-based laser interferometry for subpicometer resolution and extended unambiguous range. This technique simultaneously achieves high precision and a wide operational range, improving measurement capabilities.
Area of Science:
- Optics and Photonics
- Metrology
- Precision Engineering
Background:
- Grating-based laser interferometry is crucial for high-precision measurements.
- Existing methods often face trade-offs between resolution and unambiguous range.
- Subpicometer resolution and extended range are desirable for advanced applications.
Purpose of the Study:
- To propose and demonstrate an active control method for grating-based laser interferometry.
- To achieve simultaneous low-noise (subpicometer resolution) and multiwavelength unambiguous range operation.
- To enhance the performance of micromachined scanning grating interferometers (microSGI).
Main Methods:
- Modification of a recurrent calibration-based path stabilization algorithm.
- Parallel extraction of high-resolution and low-resolution data.
- Experimental verification using a micromachined scanning grating interferometer (microSGI).
Main Results:
- Demonstration of an active control method for improved grating interferometry.
- Achieved simultaneous subpicometer resolution and extended unambiguous range.
- Successful experimental validation of the extended range recurrent calibration method on microSGI.
Conclusions:
- The proposed active control method effectively enhances grating-based laser interferometry.
- Simultaneous achievement of high resolution and extended unambiguous range is feasible.
- The method offers a significant advancement for precision metrology applications.
