Center Off-Axis Tandem Microlens Arrays for Beam Homogenization

Cao, Axiu; Hui, Pei; Wang, Jiazhou; Zhang, Man; Shi, Lei; Deng, Qiling

doi:10.1109/jphot.2015.2433022

Cited by 11 publications

(8 citation statements)

References 15 publications

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“…As shown in Figure 2 , the simulations included a MLA and a Fourier lens. Based on the theory of scalar diffraction, when a laser beam transmits through a MLA and a Fourier lens in turn, the optical field at the focal plane of the Fourier lens is determined by the Fourier transformation of the transmission function of the MLA [ 14 ].…”

Section: Simulationsmentioning

confidence: 99%

The Effects of Profile Errors of Microlens Surfaces on Laser Beam Homogenization

et al. 2017

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Microlens arrays (MLAs) are key optical components in laser beam homogenization. However, due to imperfect surface profiles resulting from microfabrication, the functionalities of MLAs in beam modulation could be compromised to some extent. In order to address this issue, the effects of surface profile mismatches between ideal and fabricated MLAs on beam homogenization were analyzed. Four types of surface profile errors of MLAs were modeled theoretically and numerical simulations were conducted to quantitatively estimate the effects of these profile errors on beam homogenization. In addition, experiments were conducted to validate the simulation results, revealing that profile errors leading to optical deviations located on the apex of microlenses affected beam homogenization less than deviations located further away from it. This study can provide references for the further applications of MLAs in beam homogenization.

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Section: Simulationsmentioning

confidence: 99%

The Effects of Profile Errors of Microlens Surfaces on Laser Beam Homogenization

et al. 2017

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“…Many optical systems nowadays require light sources to be pre-shaped into desired light distributions. Thus, many beam shaping methods have been proposed [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Most of these studies have focused on the problem of achieving a uniform light distribution [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, many beam shaping methods have been proposed [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Most of these studies have focused on the problem of achieving a uniform light distribution [3][4][5][6]. For example, Cao et al [5] proposed a beam shaping system which produced an output beam with a uniform light distribution using two micro-lens arrays and a second lens.…”

Section: Introductionmentioning

confidence: 99%

“…Most of these studies have focused on the problem of achieving a uniform light distribution [3][4][5][6]. For example, Cao et al [5] proposed a beam shaping system which produced an output beam with a uniform light distribution using two micro-lens arrays and a second lens. Wang et al [6] proposed a 4f system architecture consisting of two spatial light modulators and two positive lenses with a focal length of f to achieve a uniform light profile.…”

Section: Introductionmentioning

confidence: 99%

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Realization of Collimated Specific Profiles in Rotation-Symmetrical Beam Shaping System with Divergent Light Source

Tsai,

Yu,

Han

et al. 2023

Preprint

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A simple numerical method is proposed for the design of two freeform surfaces, each comprising multiple segmented refractive planes, for generating a collimated beam with a specific irradiance profile in a beam shaping system with a divergent light source. However, in real-world manufacturing, this performance improvement is obtained at the expense of a greater cost and complexity. Accordingly, a second algorithm is proposed which maximizes the number of rays passing through the central regions of the refractive planes in the second freeform surface and hence minimizes the total number of segments required to achieve the same beam shaping performance. The feasibility of the proposed method is demonstrated through the design of two freeform lenses for generating collimated output beams with ring- and triangle-like irradiance profiles, respectively. The experimental results show that the beam profiles are in close agreement with the desired irradiance distributions. In general, the results indicate that the proposed method provides a versatile and efficient approach for achieving the desired collimated profile in beam forming systems with a divergent light source.

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“…Most importantly, the incident angle of the laser passing through the vapor cell is not considered, which causes the refraction or reflection of light, and thereby results in a light shift or non-uniform intensity distribution. Compared with the other beam shaping methods [ 26 , 27 , 28 , 29 , 30 ], the method with a freeform surface lens [ 31 , 32 ] with a high degree of freedom and less energy loss is better for achieving the uniform distribution of intensity of non-ideal laser sources. At shorter distances, a better uniform intensity distribution can be achieved by using only one freeform surface lens [ 33 ], especially for a big spherical vapor cell.…”

Section: Introductionmentioning

confidence: 99%

Optimized Design of a Pump Laser System for a Spin Exchange Relaxation Free Inertial Measurement Device

Hao

Yang

et al. 2021

Sensors

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In order to improve the precision and beam quality of a pump laser for a spin exchange relaxation free inertial measurement device, we applied one scheme to achieve the square wave modulation and power stability control of the pump laser and another one to obtain the uniform intensity distribution of the laser beam, in which the acousto-optic modulator (AOM) and proportion integration differentiation (PID) controller were used to achieve the former, and the freeform surface lens was designed and optimized to achieve the latter based on the TracePro software. In experiments, the first-order diffraction light beam coming through the AOM had a spot size of about 1.1 × 0.7 mm2, and a spherical vapor cell with a radius of 7 mm was placed behind the freeform surface lens. Results show that the uniformity of the reshaped intensity distribution is higher than 90% within the target area with a radius of 7 mm both in the simulation and the experiment, which ensure that the uniform laser beam covers the area of cell. On the other hand, the power stability of the pump laser is controlled to be less than 0.05%. Compared with traditional methods, the complicated calculation process in optical design is better solved, and a higher uniformity with slight energy loss is achieved.

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Center Off-Axis Tandem Microlens Arrays for Beam Homogenization

Cited by 11 publications

References 15 publications

The Effects of Profile Errors of Microlens Surfaces on Laser Beam Homogenization

The Effects of Profile Errors of Microlens Surfaces on Laser Beam Homogenization

Realization of Collimated Specific Profiles in Rotation-Symmetrical Beam Shaping System with Divergent Light Source

Optimized Design of a Pump Laser System for a Spin Exchange Relaxation Free Inertial Measurement Device

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