A laser beam shaper for homogeneous rectangular illumination based on freeform micro lens array

Abstract

An effective design method of freeform micro lens array is presented for shaping varied laser beams into prescribed rectangular illumination. The variable separation mapping is applied to design concave freeform surfaces for constructing a freeform lens array. Several dedicated examples show that the designed freeform optical lens array can achieve a prescribed rectangular illumination pattern, especially without considering the initial states of incident laser beams. Both high collection efficiency and good spatial uniformity can be available simultaneously. Tolerance analysis is also performed to demonstrate that this optical device can well avoid fabricating difficulty in actual applications.

References

[1] PinkertonA. J.. Optics & Laser Technology, 2016, 78: 25

[2] SilvestreT., FranciscoJ., MaigyteL., MalinauskasM.. Physical Review A, 2013, 84: 033812-0338121

[3] MadamopoulosN., PapageorgiouF.. Journal of Display Technology, 2014, 10: 832

[4] ChenE., WuR., GuoT.. Optics Communications, 2014, 321: 78

[5] KoichiroN., KenichiroS.. SID Symposium Digest of Technical Papers, 2015, 46: 704

[6] WeiZ. B., YangL. H., GuoY.. Journal of Optoelectronics ·Laser, 2015, 26: 1967

[7] WuR. M., LiuP., ZhangY. Q., ZhengZ. R., LiH. F., LiuX.. Opt. Express, 2013, 21: 20974

[8] ChenE., WuR.. Opt. Eng., 2015, 54: 065103

[9] WuaH., ZhangX., GebP.. Optics & Laser Technology, 2015, 72: 79

[10] BäuerleA., BrunetonA., WesterR., StollenwerkJ., LoosenP.. Opt. Express, 2012, 20: 14477

[11] SmilieP. J., SuleskiT. J.. Opt. Lett., 2011, 36: 4170

[12] LinK. C.. Optical Review, 2014, 21: 639

[13] YanW., GuoZ.. Journal of Optoelectronics·Laser, 2014, 10: 1878

This work has been supported by the National Natural Science Foundation of China (No.61405037), and the Science and Technology Project of Fujian Province (No.2015H4014).