scholarly journals Ultrashort Vortex Pulses with Controlled Spectral Gouy Rotation

2020 ◽  
Vol 10 (12) ◽  
pp. 4288
Author(s):  
Max Liebmann ◽  
Alexander Treffer ◽  
Martin Bock ◽  
Ulrike Wallrabe ◽  
Ruediger Grunwald
Keyword(s):  
Time Dependent ◽  
Spatial Light Modulators ◽  
Diffractive Optical Elements ◽  
Spectral Parameters ◽  
Optical Elements ◽  
Light Modulators ◽  
Phase Plates ◽  
Liquid Crystal On Silicon ◽  
Vortex Beams ◽  
Spiral Phase

Recently, the spatio-spectral propagation dynamic of ultrashort-pulsed vortex beams was demonstrated by 2D mapping of spectral moments. The rotation of characteristic anomalies, so-called “spectral eyes”, was explained by wavelength-dependent Gouy phase shift. Controlling of this spectral rotation is essential for specific applications, e.g., communication and processing. Here, we report on advanced concepts for spectral rotational control and related first-proof-of-principle experiments. The speed of rotation of spectral eyes during propagation is shown to be essentially determined by angular and spectral parameters. The performance of fixed diffractive optical elements (DOE) and programmable liquid-crystal-on silicon spatial light modulators (LCoS-SLMs) that act as spiral phase gratings (SPG) or spiral phase plates (SPP) is compared. The approach is extended to radially chirped SPGs inducing axially variable angular velocity. The generation of time-dependent orbital angular momentum (self-torque) by superimposing multiple vortex pulses is proposed.

scholarly journals High-Flexibility Control of Structured Light with Combined Adaptive Optical Systems

Photonics ◽  
2022 ◽  
Vol 9 (1) ◽  
pp. 42
Author(s):  
Ruediger Grunwald ◽  
Mathias Jurke ◽  
Martin Bock ◽  
Max Liebmann ◽  
Binal Poyyathuruthy Bruno ◽  
...  
Keyword(s):  
Structured Light ◽  
Optical Systems ◽  
Spatial Light Modulators ◽  
Structured Illumination ◽  
Micro Electro Mechanical Systems ◽  
Light Modulators ◽  
Phase Plates ◽  
Liquid Crystal On Silicon ◽  
Thermally Actuated ◽  
High Flexibility

Combining the specific advantages of high-resolution liquid-crystal-on-silicon spatial light modulators (LCoS-SLMs) and reflective or refractive micro-electro-mechanical systems (MEMS) presents new prospects for the generation of structured light fields. In particular, adaptive self-apodization schemes can significantly reduce diffraction by low-loss spatial filtering. The concept enables one to realize low-dispersion shaping of nondiffracting femtosecond wavepackets and to temporally switch, modulate or deflect spatially structured beams. Adaptive diffraction management by structured illumination is demonstrated for piezo-based and thermally actuated axicons, spiral phase plates (SPPs) and Fresnel bi-mirrors. Improved non-collinear autocorrelation with angular-tunable Fresnel-bi-mirrors via self-apodized illumination and phase contrast of an SLM is proposed. An extension of the recently introduced nondiffractive Talbot effect to a tunable configuration by combining an SLM and a fluid lens is reported. Experimental results for hexagonal as well as orthogonal array beams are presented.

Dynamic diffractive optical elements displayed on spatial light modulators

2004 ◽  
Author(s):  
Pierre Ambs ◽  
Laurent Bigue ◽  
Rostislav I. Rokitski ◽  
Yeshaiahu Fainman
Keyword(s):  
Spatial Light Modulators ◽  
Diffractive Optical Elements ◽  
Optical Elements ◽  
Light Modulators

scholarly journals Diffraction Efficiency Characteristics for MEMS-Based Phase-Only Spatial Light Modulator with Nonlinear Phase Distribution

Photonics ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 62
Author(s):  
Remington S. Ketchum ◽  
Pierre-Alexandre Blanche
Keyword(s):  
Diffraction Efficiency ◽  
High Speed ◽  
Phase Distribution ◽  
Complex Structure ◽  
Spatial Light Modulators ◽  
Light Modulator ◽  
Micro Electro Mechanical Systems ◽  
Light Modulators ◽  
Nonlinear Phase ◽  
Liquid Crystal On Silicon

Micro-electro mechanical systems (MEMS)-based phase-only spatial light modulators (PLMs) have the potential to overcome the limited speed of liquid crystal on silicon (LCoS) spatial light modulators (SLMs) and operate at speeds faster than 10 kHz. This expands the practicality of PLMs to several applications, including communications, sensing, and high-speed displays. The complex structure and fabrication requirements for large, 2D MEMS arrays with vertical actuation have kept MEMS-based PLMs out of the market in favor of LCoS SLMs. Recently, Texas Instruments has adapted its existing DMD technology for fabricating MEMS-based PLMs. Here, we characterize the diffraction efficiency for one of these PLMs and examine the effect of a nonlinear distribution of addressable phase states across a range of wavelengths and illumination angles.

scholarly journals Generation of diffractive optical elements onto photopolymer using liquid crystal on silicon displays

2017 ◽  
Author(s):  
Roberto Fernandez ◽  
Sergi Gallego ◽  
Francisco J. Martinez ◽  
Andres Marquez ◽  
Inmaculada Pascual ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Diffractive Optical Elements ◽  
Optical Elements ◽  
Liquid Crystal On Silicon
Sign in / Sign up

Export Citation Format

Share Document