Patent ID: 7869145

Claim:
A system for illuminating a target, comprising: a light source configured to emit one or more light beams with a first divergence; and a lens separated from the light source, the lens configured to substantially satisfy sin ⁡ ( θ ⁢ ⁢ 1 ) sin ⁡ ( θ ⁢ ⁢ 2 ) ~ constant , where θ 1 is an entering angle of divergence and θ 2 is an exiting angle of divergence, without removing spherical aberrations from the one or more light beams, the lens further configured to: receive the one or more light beams with the first divergence; change the first divergence of the one or more light beams to a second divergence, the second divergence being less than the first divergence, the second divergence being greater than zero; and transmit the one or more light beams with the second divergence.