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Updated: Jun 26, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
Published on: January 28, 2019
Mode purities of Laguerre-Gaussian beams generated via complex-amplitude modulation using phase-only spatial light
Taro Ando1, Yoshiyuki Ohtake, Naoya Matsumoto
1Central Research Laboratory, Hamamatsu Photonics KK, Hirakuchi, Hamamatsu-City, Japan. taro@crl.hpk.co.jp
Abstract:
We investigate output mode purities of Laguerre-Gaussian (LG) beams generated from four typical simultaneous amplitude and phase modulation methods with phase-only spatial light modulators (SLMs). Numerical simulations supposing the practical SLM, i.e., stepwise phase modulation with a pixelated device, predict an output mode purity of beyond 0.969 for the LG beams of less than radially and azimuthally fifth order. Experimental results of generating LG beams are also shown to demonstrate the effects of the simultaneous phase and amplitude modulation.

