The best replacement for fresnel lens is parabolic mirror.

The best alternatives to fresnel lens are rated as following:
★★★★★  parabolic mirror
★★★★  magnifying glass
★★  clear lens
★  parabolic reflector

Your alternative for fresnel lens is not listed? Suggest!
Speaking about fresnel lens, one probably shouldn't forget about solar cell.

Other search terms related to fresnel lens and their ratings are:
★★★★★ solar cell
★★★★★ stirling engine
★★★★★ projector
You have in mind a companion for fresnel lens and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of fresnel lens in all years. Click on graph for more.
fresnel lens
parabolic mirror
magnifying glass