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Biomolecular Detection employing the Interferometric Reflectance Imaging Sensor IRIS
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A simple high-precision wide-spectrum interferometric system.

Qi Lu1, Shijie Liu1, Jianda Shao1

  • 1Precision Optical Manufacturing and Testing Center, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201815, China.

The Review of Scientific Instruments
|August 3, 2019
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Summary
This summary is machine-generated.

A novel interferometric system precisely measures wavefront properties across a wide spectrum (488-1064 nm). This cost-effective, wavelength-switchable laser interferometer offers high precision for diverse optical applications.

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Area of Science:

  • Optical Engineering
  • Metrology
  • Interferometry

Background:

  • Conventional interferometric systems often struggle with precise measurements across wide spectral ranges.
  • Existing methods can be limited to single working wavelengths, restricting their application scope.
  • Measuring wavefront properties of optical bandpass elements requires versatile and precise instrumentation.

Purpose of the Study:

  • To develop a simple, cost-effective interferometric system for detecting wavefront information.
  • To achieve precise measurements across a broad wavelength range (488-1064 nm).
  • To overcome the limitations of single-wavelength interferometers for diverse optical metrology tasks.

Main Methods:

  • An interferometric system utilizing a ball lens and an aspheric collimator was designed for Gaussian beam expansion and collimation.
  • The system's precision was experimentally validated by measuring the surface profile of N-BK7 glass against a commercial interferometer.
  • The system was applied to measure the transmitted-wavefront error of a solar filter at 808.0 nm.

Main Results:

  • Experimental verification confirmed the system's precise and effective operation across various test wavelengths.
  • Measurement results for the solar filter demonstrated superb repeatability.
  • The proposed system achieved highly consistent results compared to a digital 4D FizCam 2000 interferometer.

Conclusions:

  • The developed system provides a precise and effective method for wavefront detection in the 488-1064 nm range.
  • This technique offers a versatile, high-precision, and low-cost alternative to conventional single-wavelength interferometers.
  • The system supports future applications requiring wavelength-switchable laser interferometry for optical metrology.