Beam profile shaping for laser radars that use detector arrays

Area of Science:

• Optics and Photonics
• Laser Technology
• Radar Systems

Background:

• CO(2) laser radar systems require precise beam shaping for optimal performance.
• Uniform illumination of detector arrays is crucial for accurate signal detection.

Purpose of the Study:

• To develop and evaluate a novel beam shaper for CO(2) laser radar.
• To achieve efficient and uniform far-field illumination of a linear detector array.

Main Methods:

• The beam shaper comprises a diffraction grating and an anamorphic prism beam compressor.
• The diffraction grating introduces phase modulation to the laser beam's near field.
• The anamorphic prism compressor adjusts the beam's profile eccentricity.

Main Results:

• The developed beam shaper produces a stretched beam profile for uniform far-field illumination.
• A flattop intensity profile is generated in the far-field, matching the detector array's footprint.
• Conversion efficiencies ranging from 70% to 90% were achieved.

Conclusions:

• The novel beam shaper effectively shapes CO(2) laser radar beams for uniform detector array illumination.
• The system demonstrates high efficiency, making it suitable for practical radar applications.
• This technology enhances the performance and reliability of CO(2) laser radar systems.