Chinese Optics Letters, Volume. 22, Issue 5, (2024)
Multi-focus non-periodic scanning method for femtosecond laser based on DMD and galvanometer scanners [Early Posting]
Multi-focus parallel scanning can effectively increase laser fabrication throughput. However, conventional approach of using a spatial light modulator (SLM) to generate multi-foci and scanning these fixed number of foci with the galvanometer scanners, can only achieve periodic scanning trajectory due to the low switching speed of the SLM. Here we demonstrate a multi-focus non-periodic scanning method for femtosecond laser by using, instead, a fast-switching digital micromirror device (DMD) to generate dynamic number of foci. The number of effective foci is quickly switched by introducing aberration to the undesired focus. In this way, intensity allocated to each focus will not be affected by the number of focus and a uniformity of 98% with different number of foci is achieved without adjusting the total laser energy. Finally, we validated the effectiveness of this scanning method by demonstrating corneal flap fabrication of porcine cornea in-vitro.
Manuscript Accepted: Jan. 22, 2024
Posted: Feb. 6, 2024