Laser beam homogenizing system design for photoluminescence

Area of Science:

• Optics and Photonics
• Materials Science
• Semiconductor Device Physics

Background:

• Uniform laser illumination is critical for accurate characterization of semiconductor devices.
• Traditional methods often struggle to achieve large-area uniformity, limiting their application scope.

Purpose of the Study:

• To develop and validate a new optical system for generating large-area uniform laser spots.
• To demonstrate the applicability of this system in photoluminescence imaging of semiconductor devices.

Main Methods:

• Utilizing waveguide coupling technology and a kaleidoscope homogenizer to redistribute laser beam intensity.
• Employing an imaging system to shape the homogenized beam into a large square spot.
• Testing uniformity across different irradiation areas (3.5 cm × 3.5 cm and 10 cm × 10 cm).

Main Results:

• Simulation results show light intensity uniformity exceeding 89% for both tested areas.
• Practical applications demonstrated uniformity greater than 85%.
• Successful application in photoluminescence imaging detection of semiconductor devices.

Conclusions:

• The developed technology effectively produces large-area uniform laser spots.
• This method offers a versatile solution for various research applications requiring uniform laser illumination, particularly in semiconductor analysis.