High-resolution refractometry using phase shifting interferometry based on spatial light modulator and vortex probe

According to the principle of phase-shifting interferometry and spiral phase characteristics of the vortex beam, this article proposes a method for detecting the surface profile of a transparent object, in which the +1 order vortex beam is generated by a spatial light modulator and is taken as the reference light. The influence of the nonlinear phase modulation characteristics of the spatial light modulator on the measurement precision is studied. The results show that nonlinear phase modulation has a great impact on the measurement. Then, the vortex lights with initial phases of 0, π/2, π, and 3π/2 are used to measure the H-type thin film sample based on the Twyman-Green interference system after correcting the nonlinear phase modulation characteristics. The experimental results show that the measurement error of the surface profile to an object with the theoretical value of 20 nm is 1.146 nm, and the feasibility of the optical vortex phase-shifting technique used to measure the surface profile of an object is verified.

Download Full-text

Two-wavelength phase-shifting interferometry with a superimposed grating displayed on an electrically addressed spatial light modulator

Applied Optics ◽

10.1364/ao.44.001577 ◽

2005 ◽

Vol 44 (9) ◽

pp. 1577 ◽

Cited By ~ 6

Author(s):

Youichi Bitou

Keyword(s):

Spatial Light Modulator ◽

Phase Shifting ◽

Light Modulator ◽

Phase Shifting Interferometry

Download Full-text

Phase-only transmissive spatial light modulator based on tunable dielectric metasurface

Science ◽

10.1126/science.aaw6747 ◽

2019 ◽

Vol 364 (6445) ◽

pp. 1087-1090 ◽

Cited By ~ 64

Author(s):

Shi-Qiang Li ◽

Xuewu Xu ◽

Rasna Maruthiyodan Veetil ◽

Vytautas Valuckas ◽

Ramón Paniagua-Domínguez ◽

...

Keyword(s):

High Resolution ◽

Spatial Light Modulator ◽

Deflection Angle ◽

Beam Steering ◽

Beam Deflection ◽

Spatial Light Modulators ◽

Light Modulator ◽

Steering Angle ◽

Holographic Display ◽

Light Modulators

Rapidly developing augmented reality, solid-state light detection and ranging (LIDAR), and holographic display technologies require spatial light modulators (SLMs) with high resolution and viewing angle to satisfy increasing customer demands. Performance of currently available SLMs is limited by their large pixel sizes on the order of several micrometers. Here, we propose a concept of tunable dielectric metasurfaces modulated by liquid crystal, which can provide abrupt phase change, thus enabling pixel-size miniaturization. We present a metasurface-based transmissive SLM, configured to generate active beam steering with >35% efficiency and a large beam deflection angle of 11°. The high resolution and steering angle obtained provide opportunities to develop the next generation of LIDAR and display technologies.

Download Full-text

Digital phase-shifting interferometer with an electrically addressed liquid-crystal spatial light modulator

Optics Letters ◽

10.1364/ol.28.001576 ◽

2003 ◽

Vol 28 (17) ◽

pp. 1576 ◽

Cited By ~ 37

Author(s):

Youichi Bitou

Keyword(s):

Liquid Crystal ◽

Spatial Light Modulator ◽

Phase Shifting ◽

Light Modulator ◽

Digital Phase

Download Full-text

High-Resolution Correction of Arbitrary Wavefront Aberration Using Liquid Crystal Spatial Light Modulator

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.121-126.877 ◽

2011 ◽

Vol 121-126 ◽

pp. 877-881

Author(s):

Hong Xin Zhang ◽

Xiao Xi Xu

Keyword(s):

Liquid Crystal ◽

High Resolution ◽

Spatial Light Modulator ◽

Low Cost ◽

Phase Conjugation ◽

Astronomical Observation ◽

Wavefront Aberration ◽

Strehl Ratio ◽

Light Modulator ◽

Wavefront Correction

Wavefront correction plays significant role in some fields like astronomical observation, laser processing and medical imaging, etc. Liquid crystal spatial light modulator ( LC SLM) is an ideal device for high-resolution wavefront correction because of its low cost, low consumption, large number of pixels and independent programming control of each unit. It is researched experimentally that LC SLM is used as a wavefront correction device and corrects arbitrary wavefront aberration. Wavefront correction is performed based on phase conjugation and periodic phase modulation with modulo-2π. The experimental results show that the PV value of the irregular wavefront aberration is 1.56λ, RMS value is 0.25 and Strehl ratio is 0.08 before correction, but the PV value of the residual aberration is reduced to 0.26λ, RMS value is 0.02 and Strehl ratio is increased to 0.97 which is approximated diffraction limit after correction. It is proved to be feasible and effective that LC SLM is used to the high-precision and high-resolution wavefront correction.

Download Full-text