Very efficient speckle suppression in the entire visible range by one two-sided diffractive optical element

作者：Lapchuk, Anatoliy; Pashkevich, Genadzi; Prygun, Olexandr; Kosyak, Igor; Fu, Minglei; Le, Zichun^*; Kryuchyn, Andriy

来源：Applied Optics, 2017, 56(5): 1481-1488.

DOI：10.1364/AO.56.001481

• REDUCTION
• DISPLAYS
• CONTRAST
• SPEED

The impact of the precision and direction of motion of a two-dimensional (2D) diffractive optical element ( DOE) based on binary pseudo-random sequences on speckle suppression efficiency is investigated experimentally. The experimental data show a large speckle suppression efficiency and agree qualitatively with the theoretical results. The experimental results confirm that the wavelength range for the speckle suppression of a two-level 2D DOE based on binary random sequences is narrower than the visible range. The experimental data confirm the theoretical prediction that the wavelength range for the speckle suppression for a double-sided one-dimensional (1D) DOE is wider than the visible range. The large speckle suppression coefficient k > 16 and a speckle contrast below 2.6% are obtained in the entire visible range by using one two-sided 1DM-sequence-based DOE with code length N = 15. The proposed method has potential applications in laser projection display systems.

• 出版日期2017-2-10
• 单位浙江工业大学