A novel digital laser setup with two controllable phase boundaries can generate complex structured beams. Experiments confirm the new configuration can generate vortex beams with controllable over both topological charge and intensity profiles. Not only vortex beams, but this cavity can also produce all kind of nondiffracting beam, including the Parabolic-Gauss beam, which was previously unattainable directly from laser cavities. This innovative digital laser configuration represents a versatile option for customizable structured beam laser facilitating wide-ranging applications.
One of the major problems of designing an illumination optical system is the repeatedly time-consuming ray-tracing process while optimizing the illumination optical system parameters. This study proposes a “one-time ray-tracing method” for the optimization of illumination systems. As a demonstration, this study designs a planar lightguide backlight with uniformly irradiance at the light-exiting surface using the proposed one-time ray-tracing method. In this method, the irradiance distributions of the target region are related to the radiant intensity distribution of the side planar light sources. Using only one-time ray tracing and the optimization of the light source radiant intensity, the proposed method can quickly find a design of the planar lightguide backlight for providing an uniformly irradiance distribution at target illumination region. That is, with only one-time ray tracing and the optimization technique, the CV(RMSR) (coefficient of variation of root mean square error), of the target region irradiance distribution was decreased to 0.06 from 0.12. The proposed method holds great potential to the designing illumination systems, since it can be applied to design not only the planar lightguide but also other optical illumination systems.
Optical vortices possess several special properties, including carrying optical angular momentum (OAM) and exhibiting zero intensity. Vortex array laser beams have attracts many interests due to its special mesh field distributions, which show great potential in the application of multiple optical traps and dark optical traps. Previously study developed an Ince-Gaussian Mode (IGM)-based vortex array laser beam1. This study develops a simulation model based on the discrete dipole approximation (DDA) method for calculating the resultant force acting on a micro-sized spherical dielectric particle that situated at the beam waist of the IGM-based vortex array laser beams1.
This study proposed a method for calculating any arbitrarily linear polarization paraxial optical field propagation in
Gradient-index (GRIN) lens. The proposed method uses multiple thin-phase sheets to approximate a GRIN lens. This
study also compares the proposed method with the other well-known method. That is, using a single lens equivalent
optical system of Fractional Fourier transform (FrFT) to simulate a GRIN lens. The evolution in GRIN lenses of many
special beams have been calculated by the FRFT-method. This study use both methods to calculate the Helmholtz-Gauss
beam evolution in GRIN lenses of a small and a high gradient constant, respectively. Numerical results shows that the
differences between two calculation methods appeared while the GRIN lens of a high gradient constant. This study
provides an alternative approach could calculate the linearly polarized field evolution in GRIN lenses with higher
precision, which will be useful to the optical design of GRIN lens systems.
This paper proposes a sawtooth-shape planar lightguide solar concentrator. In this design, sunlight is collected by each
lens in a two-dimensional lens array and is coupled into the planar lightguide using localized micro structure placed at
each lens focus. Where the micro structure is the dimpled structure [2010 International Optical Design Conference, paper
ITuE5P]. In this design, one side of the planar lightguide was shaped in a sawtooth-form shape. The usage of the
sawtooth-shape planar lightguide prevents most leakage of guiding rays after multiple reflections in lightguide.
Simulation results show that the sawtooth-shape planar lightguide solar concentrator can achieve 92% optical efficiency
at 300× concentration.
This study drafts simulation code to model the optical filed oscillation of end-pumped solid-state lasers, and proposed a
kind of axicon-based stable laser resonator. Using numerical explorations, we find a systematic method to the selective
excitation of nearly non-diffraction Mathieu-Gauss beams in end-pumped solid-state lasers with the proposed resonator.
This study reports a method of creating vortex array laser beams by superposing high-order laser modes on their rotated
replicas. An interferometer configuration was used to convert these high-order laser modes to vortex array laser beams
containing multi vortexes aligned in an almost square manner. To generate this kind vortex array laser beams, this study
reports systematic approaches to the selective excitation of high-order laser modes in end-pumped solid-state lasers with
laser resonators and asymmetric pumping. The resulting vortex array laser beams can be used as optical tweezers and
atom traps in the form of two-dimensional arrays, or to study the transfer of angular momentum to micro particles or
atoms (Bose-Einstein condensate).
This paper introduces a scheme for generation of vortex laser beams from a solid-state laser with off-axis laser-diode
pumping. The proposed system consists of a Dove prism embedded in an unbalanced Mach-Zehnder interferometer
configuration. This configuration allows controlled construction of p × p vortex array beams from Ince-Gaussian modes,
IGep,p modes. An incident IGep,p laser beam of variety order p can easily be generated from an end-pumped solid-state
laser with an off-axis pumping mechanism. This study simulates this type of vortex array laser beam generation and
discusses beam propagation effects. The formation of ordered transverse emission patterns have applications in a variety
of areas such as optical data storage, distribution, and processing that exploit the robustness of soliton and vortex fields
and optical manipulations of small particles and atoms in the featured intensity distribution.
A resonator to generate a single LGp=0[mathematical symbol 'ell']
=1 donut mode with high mode purity up to 99% is reported. The resonator
consists of three lens elements and one binary phase element. With such high mode purity, the generated donut laser
beam is applicable to a number of studies including trapping and rotating micro particles, non-linear optics, and atomlight
interaction. The tolerance of the proposed configuration is discussed, as well methods of compensating for the
thermal effects of laser materials while manipulating the resonator in a practical laser diode end-pumped solid state laser
system.
A novel bending lightpipe operation scheme with an arbitrary bent angle without light leakage is illustrated in details. Possible applications to a light-splitting element that could split light flux with specified separation ratio, and a light-mixing element that could mix light fluxes from several ports of entrance without light leakage are also shown with case demonstration.
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