Robust beam width estimation with sub-pixel resolution in uncontrolled imaging conditions

Area of Science:

• Optics and Photonics
• Laser Technology
• Imaging Science

Background:

• Laser beam width measurements vary significantly based on methodology and conditions.
• Existing methods can be unreliable under challenging imaging scenarios.

Purpose of the Study:

• To adapt and validate an imaging analysis method for precise laser beam width determination.
• To assess the method's efficacy in noisy and background-illuminated environments.
• To achieve sub-pixel resolution for small spatial extent laser beams.

Main Methods:

• Utilized an imaging analysis technique based on the ratio of encircled energy to beam diameter.
• Applied the method to laser beam profiles under simulated noisy and background illumination conditions.
• Evaluated measurement accuracy and resolution capabilities.

Main Results:

• The encircled energy-to-diameter ratio method demonstrated high accuracy in laser beam width estimation.
• The technique proved robust and reliable even with significant image noise and background light.
• Sub-pixel resolution was achieved for laser beams with spatial extents of only a few pixels.

Conclusions:

• The adapted imaging analysis method offers a valuable tool for accurate laser beam width measurement.
• This approach enhances reliability in challenging optical measurement scenarios.
• It provides a pathway for high-resolution beam characterization, particularly for small or faint beams.