Expansive scope of aplanatic concentrators and collimators

Area of Science:

• Optical Engineering
• Radiative Transfer Optics

Background:

• Aplanats are optical systems that eliminate spherical aberration and coma.
• Traditionally used in imaging, aplanats have potential in nonimaging radiative transfer applications like LEDs and solar energy.

Purpose of the Study:

• To review and elaborate the full scope of aplanat classifications.
• To present new possibilities for LED collimation and solar energy concentration using aplanats.
• To demonstrate practical, maximum-performance optical designs for various aplanat combinations.

Main Methods:

• Classification of aplanats based on refractive and reflective surface combinations.
• Development of theoretical models for aplanat performance in collimation and concentration.
• Illustrative design examples including faceted (Fresnel) and hybrid aplanats.

Main Results:

• Identification of previously unrecognized basic aplanat categories.
• Demonstration of aplanats approaching thermodynamic limits for collimation and concentration.
• Examples of compact and lightweight faceted aplanats.
• Improved performance using hybrid aplanat designs.

Conclusions:

• Aplanats offer significant potential for enhancing light-emitting diode (LED) collimation and solar energy concentration.
• The reviewed classifications and designs provide a comprehensive guide for practical aplanat applications.
• Future work can leverage hybrid aplanats for further performance gains in radiative transfer.