High-quality generation of higher-order Laguerre-Gaussian beams using liquid crystal on silicon spatial light modulator
2008
We report holographic generation of higher-order Laguerre-Gaussian (LG) beams using a liquid crystal on silicon
spatial light modulator (LCOS-SLM) device. In our experimental set-up, a flat-top light beam was projected
on the LCOS-SLM to generate LG beams of various mode indices without changes of the optical system. Additionally,
the size of the holographic phase pattern was optimized for each beam to maximize the mode purity
of the obtained beam. Holographic generation of LG beams is easily influenced by a distortion of the optical
system and deviation of the phase setting from an ideal one. Nevertheless, we obtained high-quality LG beams
with an additional phase pattern on the LCOS-SLM for canceling the distortion of the optical system and with
calibration of the phase control voltage for precise expression of the phase patterns. Numerical analyses are
also performed for two-dimensional beam profiles to verify the quality of the obtained beams. Through fitting
the obtained profiles to theoretical ones, we calculate the correlation coefficients R between the observed and
fitted profiles to find that R > 0.95 for all beams and that the correlation coefficients behave similarly to the
theoretically estimated mode purities, facts indicating that the quality of the obtained LG beams is close to the
theoretical limit in our experiments.
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