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Laser-induced Forward Transfer for Flip-chip Packaging of Single Dies

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Published on: March 20, 2015

Synchronous characterization of semiconductor microcavity laser beam.

T Wang¹, G L Lippi¹

¹Institut Non Linéaire de Nice, Université de Nice Sophia Antipolis, Sophia Antipolis, France.

The Review of Scientific Instruments

|July 3, 2015

Summary

This summary is machine-generated.

This study introduces a high-resolution imaging technique to map laser beam properties. It reveals laser frequency homogeneity above threshold and wavelength fluctuations in beam tails.

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Area of Science:

Optics and Photonics
Laser Physics
Beam Characterization

Background:

Understanding laser beam characteristics is crucial for applications.
Previous methods lacked simultaneous intensity and frequency mapping.
Laser frequency distribution and its relation to beam shape require detailed investigation.

Purpose of the Study:

To develop and demonstrate a high-resolution double-channel imaging method.
To synchronously map laser beam intensity and optical frequency distributions.
To analyze the spatial and temporal characteristics of laser beams.

Main Methods:

Utilizing a novel high-resolution double-channel imaging system.
Synchronously capturing intensity and optical frequency data in the plane orthogonal to beam propagation.
Performing temporal analysis at specific points within the beam cross-section.

Main Results:

Demonstrated that laser frequency distribution is inhomogeneous below threshold and homogeneous above threshold within the fundamental Gaussian mode.
Observed significant laser wavelength fluctuations in the beam tails, deviating from the Gaussian shape.
Identified potential causes for wavelength fluctuations, including manufacturing imperfections and spontaneous emission in low-intensity wings.

Conclusions:

The developed imaging method provides comprehensive spatial and temporal characterization of laser beams.
The study elucidates the transition of laser frequency distribution from inhomogeneity to homogeneity with increasing power.
Insights into beam defects and their spectral characteristics are gained, aiding in laser design and application.