Optical beam-shaping design based on aspherical lenses for circularization, collimation, and expansion of elliptical laser beams

Serkan, M.; Kirkici, H.

doi:10.1364/ao.47.000230

Cited by 35 publications

(17 citation statements)

References 13 publications

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“…As the HDHECL system consists of 2 half-elliptical cylinders, there exist difficulties to polish this system. So far, researches on polishing a elliptical cylinder lens have been conducted [8][9][10][11][12][13] . Advances in the development of manufacture industry are expected to lead to further simplicity in polishing the elliptical cylinder lens.…”

Section: Fig3 Spot Sizes Of Hdhcl and Hdheclmentioning

confidence: 99%

Beam collimation of the laser diode with a heteroaxial double half-elliptical cylinder lens

Gao

Zeng

2010

Optoelectron. Lett.

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A new collimation system, the heteroaxial double half-elliptical cylinder lens (HDHECL), is proposed based on the raytracing method, and the collimation performance of the HDHECL is discussed and compared with conventional lenses. The simulation results suggest that the refractive index of the HDHECL can be larger than 2, the collimation effect is improved with the increase of the refractive index in a certain range, and the divergence angle in the fast-axis direction can be compressed to less than 0.01 mrad theoretically. These results are of significance in theory and practice.In recent years, diode lasers have been widely used in practical applications, such as fiber communications, optical sensors, and optical measuring instruments. Because of the shape and waveguide properties of their active areas, laser diodes generate astigmatic beams with elliptically shaped mode profiles [1,2] . Thus, in practical applications, optical elements are required to be collimated and compensated for the laser beam with different diameters emitted from a laser diode [3][4][5][6][7][8][9][10] . Several methods have been discussed to collimate the divergence angle in the fast-axis direction. Collimation characteristics of the double half-cylindrical lens have been reported in Refs. [3,4]. In the context of the previous methodologies, it is found that the collimation performance can be improved with the structural parameter k 2 decreasing when the double half-cylindrical lens is utilized to collimate the laser diode beam. Extremely small k 2 results in extremely large r 2 and thus the output spot is enlarged, posing a challenge on the practical applications. In this paper, a new structure of cylindrical lens-HDHECL is presented, and its collimation performance is analyzed in detail. The numerical results show that the collimated beam has better properties and smaller spot size than that in Refs. [3,4] under the condition of optimal collimation.The lens configuration, consisting of 2 half-elliptical cylinders with a distance between their centers, is shown schematically in Fig.1. The optic axis of the lens is in the direction of the slow-axis. The divergence rays in the fast-axis direction are incident upon one half-elliptical cylinder, and * after twice refractions, the rays pass through another halfelliptical cylinder. Then the collimated beams are obtained. Fig.1 Structure of HDHECLThe length of active region of the laser diode is less than 1 m in the perpendicular direction, and hence the light source in the slow-axis direction can be regarded as a line source. Because of the axial symmetry in the direction of propagation, only the upper half beams are considered. The schematic diagram of optical path of the upper half-plane of HDHECL, characterized with five parameters, a 1 , a 2 , b 1 , b 2 and d in the fast-axis direction of the laser diode, is shown in Fig.2. Thereinto, a 1 , b 1 and a 2 , b 2 are the lengths of semi-axes of the left and right half-elliptical cylinder lenses, respectively, and d denotes the distance betwee...

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Section: Fig3 Spot Sizes Of Hdhcl and Hdheclmentioning

confidence: 99%

Beam collimation of the laser diode with a heteroaxial double half-elliptical cylinder lens

Gao

Zeng

2010

Optoelectron. Lett.

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“…The measuring mathematical model related to a linestructured laser is always based on the fact that the laser surface is regarded as an ideal plane. However, previous research and experiments have been carried out to verify that beam characteristics and lens groups cause uneven distributions of laser energy [13]- [14]. The assembly process of a cylindrical lens causes slight deformations to the actual laser surface, which can be magnified in a large volume space.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Optimization of Rotary Laser Surface for Large-Scale Optoelectronic Measurement System

Lin

Sun

Yang

et al. 2021

IEEE Trans. Instrum. Meas.

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A rotary laser optoelectronic measurement system is used as part of a multistation network for large-scale metrology. The line-structured laser surface of the transmitter is regarded as an ideal plane for the intersecting measurement. This paper presents how the rotary laser surface model can be optimized for large-scale optoelectronic measurement systems. Initially, the deformation of the laser surface caused by the assembly error in a cylindrical lens is analyzed by Zemax simulation and studied by a visual evaluation method based on a high-precision tri-axis rotary table. Based on the analysis result, the folded linear surface model and the quadric surface model are applied to re-establish the laser surface model respectively to reduce the shape error. A highprecision 3D coordinate field is designed to acquire an accurate surface parametric model and validate the fitness of the new models. The experimental results based on workshop Measurement Positioning System (wMPS) show that both optimization models are conducive to improving the fitting accuracy of laser surfaces, and the quadric surface model fits better when the surface shape is closer to the commonest twofolded linear model. At last, optimizing the laser surface model plays an important role in improving the system measurement accuracy.

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“…To solve this problem, a holographic optical element (HOE) can be used as a screen. Projecting a 2D image using HOE enables the determination of the size and depth of the image by the lens equation given in Equation (1) [5][6][7][8][9]. Here, d o represents the object distance, d i represents the image distance, and f represents the focal distance of the lens [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A Study on Augmented 3D Display Optimization Based on Holographic Optical Element for High Depth and Magnified Image

Hwang

Lee

et al. 2021

Front. Phys.

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Modern Pepper's ghost—“floating hologram”—systems generally use transparent screens called half mirrors or foils. this system must have the same screen size as the image size in order to display a large-sized image. Further, depth of the image can only be obtained from the distance between the screen and the display panel. These limitations can be overcome using holographic optical elements (HOE). HOE is made by recording as a refractive force of the lens with holographic material. In this study, the numerical values of the reconstructed images were theoretically analyzed through optical ray tracing, and the theoretical design of the reconstructed image size and depth plane was numerically measured and experimentally verified.

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Optical beam-shaping design based on aspherical lenses for circularization, collimation, and expansion of elliptical laser beams

Cited by 35 publications

References 13 publications

Beam collimation of the laser diode with a heteroaxial double half-elliptical cylinder lens

Beam collimation of the laser diode with a heteroaxial double half-elliptical cylinder lens

Modeling and Optimization of Rotary Laser Surface for Large-Scale Optoelectronic Measurement System

A Study on Augmented 3D Display Optimization Based on Holographic Optical Element for High Depth and Magnified Image

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