Near- and far-field characterization of diode lasers

Area of Science:

• Optics and Photonics
• Semiconductor Device Physics

Background:

• Accurate characterization of laser diode output is crucial for device performance optimization.
• Existing methods may lack the resolution or integrated capabilities for comprehensive analysis.

Purpose of the Study:

• To describe a novel experimental apparatus for simultaneous near-field and far-field pattern recording of laser diodes.
• To detail the capabilities and resolution limits of the developed system.

Main Methods:

• Development of an experimental apparatus with 375x optical magnification.
• Implementation of a system for recording near-field intensity distribution with ~0.5 micrometer resolution.
• Integration of a device for far-field distribution recording with 0.5-degree accuracy.
• Utilization of a calibrated photodiode for output power vs. peak current measurements.

Main Results:

• The apparatus successfully records near-field patterns with diffraction-limited resolution (~0.5 micrometers).
• Far-field patterns can be accurately measured to within 0.5 degrees.
• The system allows for simultaneous visualization of both near- and far-field characteristics.
• Output power versus peak current can be reliably obtained.

Conclusions:

• The novel apparatus provides a comprehensive tool for laser diode characterization.
• The system's resolution and accuracy enable detailed analysis of laser diode output properties.
• This setup facilitates a deeper understanding of laser diode behavior and performance.