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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

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Published on: July 5, 2016

Pulsed laser source digital holography efficiency measurements.

Steven A Owens, Mark F Spencer, Douglas E Thornton

|October 18, 2022

Summary

This summary is machine-generated.

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This study measured digital holography system efficiency using a pulsed laser and SWIR camera. Results align with previous findings, demonstrating accurate characterization via ambiguity efficiency despite noise.

Area of Science:

Optics and Photonics
Digital Holography
Infrared Imaging

Background:

Digital holography systems are crucial for 3D imaging and metrology.
Previous studies utilized continuous-wave lasers and visible cameras for efficiency measurements.
Pulsed laser sources and short-wave infrared (SWIR) cameras offer potential advantages in specific applications.

Purpose of the Study:

To measure the total system efficiency of a digital holography system using a 1064 nm pulsed laser and a SWIR camera.
To compare the measured efficiency with previous results obtained using different laser and camera technologies.
To characterize system efficiency as a function of temporal delay between signal and reference pulses.

Main Methods:

Utilized a 1064 nm pulsed laser source and a short-wave infrared (SWIR) camera.

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Employed an off-axis image plane recording geometry for digital holography.

Formulated component efficiency from the ambiguity function to characterize system performance.

Main Results:

Achieved a total system efficiency of 15.9% at zero path-length difference, consistent with prior research.
Accurately characterized total system efficiency as a function of temporal delay using component efficiency derived from the ambiguity function.
Demonstrated robust system performance characterization despite pulsed laser multimode behavior and SWIR camera dark current noise.

Conclusions:

The study validates the use of pulsed lasers and SWIR cameras for digital holography efficiency measurements.
Ambiguity function-based component efficiency provides an accurate method for characterizing system performance.
The findings contribute to understanding and optimizing digital holography systems for various applications.