Excitation of high-radial-order Laguerre-Gaussian modes in a solid-state laser using a lower-loss digitally controlled amplitude mask

摘要

In this paper we experimentally demonstrate selective excitation of high-radial-order Laguerre-Gaussian (LGp or LGp, 0) modes with radial order p = 1-4 and azimuthal order l = 0 using a diode-pump solid-state laser (DPSSL) that is digitally controlled by a spatial light modulator (SLM). We encoded an amplitude mask containing p-absorbing rings, of various incompleteness (segmented) on grey-scale computer-generated digital holograms, and displayed them on an SLM which acted as an end mirror of the diode-pumped solid-state digital laser. The various incomplete (a) p-absorbing rings were digitally encoded to match the zero-intensity nulls of the desired LGp mode. We show that the creation of LGp, for p. =. 1 to p. =. 4, only requires an incomplete circular p-absorbing ring that has a completeness of approximate to 37.5%, giving the DPSSL resonator a lower pump threshold power while maintaining the same laser characteristics (such as beam propagation properties).