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  • Optica Publishing Group  (320)
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  • Optica Publishing Group  (320)
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  • 1
    Online Resource
    Online Resource
    Terahertz quantitatively distinguishing gasoline mixtures using multiparameter-combined analysis
    Optica Publishing Group ; 2013
    In:  Applied Optics Vol. 52, No. 30 ( 2013-10-20), p. 7382-
    Details
    In: Applied Optics, Optica Publishing Group, Vol. 52, No. 30 ( 2013-10-20), p. 7382-
    Type of Medium: Online Resource
    ISSN: 0003-6935 , 1539-4522
    URL: Article
    DOI: 10.1364/AO.52.007382
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2013
    detail.hit.zdb_id: 207387-0
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  • 2
    Online Resource
    Online Resource
    Color curved hologram calculation method based on angle multiplexing
    Optica Publishing Group ; 2022
    In:  Optics Express Vol. 30, No. 2 ( 2022-01-17), p. 3157-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 30, No. 2 ( 2022-01-17), p. 3157-
    Abstract: In this paper, a method of color curved hologram calculation based on angle multiplexing is proposed. The relationship between the wavelength, center angle and sampling interval of the curved holograms is analyzed for the first time by analyzing the reconstruction process of the curved holograms with different wavelengths. Based on this relationship, the color curved holograms are calculated by compensating phase to the complex amplitude distribution of the planar holograms. To eliminate the chromatic aberration, the curved holograms of different objects with the same color channel are respectively used for angle multiplexing and phase compensation, and then the color composed curved hologram is generated. Different color objects without chromatic aberration can be reconstructed by bending the composed curved hologram into different central angles. The experimental results verify the feasibility of the proposed method. Besides, the application of the proposed method in augmented reality display is also shown.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.451186
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 1491859-6
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  • 3
    Online Resource
    Online Resource
    Holographic near-eye display system with large viewing area based on liquid crystal axicon
    Optica Publishing Group ; 2022
    In:  Optics Express Vol. 30, No. 19 ( 2022-09-12), p. 34106-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 30, No. 19 ( 2022-09-12), p. 34106-
    Abstract: In this paper, a liquid crystal axicon based holographic near-eye display system with large viewing area is proposed. The viewing area of the system is extended by implementing the liquid crystal axicon. The error diffusion algorithm is used to calculate the computer-generated hologram (CGH). When incident on the liquid crystal axicon placed at the back focal plane of Fourier lens, the reconstruction light modulated by the CGH is deflected into two directions resulting in a viewing area extension. Meanwhile, to illustrate the potential of the proposed system, two-dimensional viewing area extension is demonstrated. It combines the frequency spectrum shift with the proposed system and achieves a double expansion of the horizontal viewing area and three-times expansion of the vertical viewing area. Feasibility of the proposed system is verified by optical experiments. The proposed system has potential applications in holographic augmented reality (AR) display.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.468078
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 1491859-6
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  • 4
    Online Resource
    Online Resource
    Curved hologram generation method for speckle noise suppression based on the stochastic gradient descent algorithm
    Optica Publishing Group ; 2021
    In:  Optics Express Vol. 29, No. 26 ( 2021-12-20), p. 42650-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 29, No. 26 ( 2021-12-20), p. 42650-
    Abstract: In this paper, a curved hologram generation method with suppressed speckle noise is proposed. In the process of generating the curved hologram, the angle spectrum method is used to calculate the 3D object in layers. By analyzing the loss function relationship between the diffraction image of the curved hologram and the target light field, the loss function is calculated. The phase of the hologram is updated based on the stochastic gradient descent algorithm, thereby obtaining the optimal phase distribution of the curved hologram. When the curved hologram is reproduced at different bending center angles, the reconstructed image of the corresponding angle can be seen. The proposed method has obvious advantages compared with the error diffusion method and Fresnel diffraction algorithm. The feasibility of the proposed method is verified by the experiments.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.444321
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
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  • 5
    Online Resource
    Online Resource
    Method of curved composite hologram generation with suppressed speckle noise
    Optica Publishing Group ; 2020
    In:  Optics Express Vol. 28, No. 23 ( 2020-11-09), p. 34378-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 28, No. 23 ( 2020-11-09), p. 34378-
    Abstract: In this paper, a curved composite hologram (CCH) generation method with suppressed speckle noise is proposed. The recorded 3D object is considered as many layers with different depths and the planar hologram (PH) for each layer is generated accordingly. Then the PH is transformed to curved hologram (CH). The CH of the recorded 3D object can be generated by superposing the CHs for all the layers. Also, the linear phase factor is superposed to the CH of the object. For different objects, the bending angle and linear phase factor of the hologram are different. The CCH is generated by superimposing the CHs of different objects. Finally, the CCH is encoded by using the error diffusion method and optimized by superposing of the digital lens. When the CCH is reproduced from different angles, the reconstructed images with suppressed speckle noise can be displayed. The experimental results verify the feasibility of the proposed method.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.406265
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2020
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  • 6
    Online Resource
    Online Resource
    Fast hologram generation method based on the optimal segmentation of a sub-CGH
    Optica Publishing Group ; 2020
    In:  Optics Express Vol. 28, No. 21 ( 2020-10-12), p. 32185-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 28, No. 21 ( 2020-10-12), p. 32185-
    Abstract: In this paper, a fast hologram generation method is proposed based on the optimal segmentation of a sub-computer-generated-hologram (sub-CGH). The relationship between the pixels on the hologram and the corresponding reconstructed image is calculated firstly. Secondly, the sub-CGH corresponding to the object point from the recorded object is optimized and divided into the optimized diffraction area and the invalid diffraction area. Then, the optimized diffraction area of the sub-CGH for each object point is pre-calculated and saved. Finally, the final hologram can be generated by superimposing all the sub-CGHs. With the proposed method, the calculation time for the final hologram can be significantly reduced and the quality of the reconstructed image is not affected. Moreover, the proposed method has the advantages of perspective enlargement compared with the traditional method, and the experiment results verify its feasibility.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.403252
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2020
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  • 7
    Online Resource
    Online Resource
    Real scene acquisition and holographic near-eye display system based on a zoom industrial endoscope
    Optica Publishing Group ; 2022
    In:  Optics Express Vol. 30, No. 18 ( 2022-08-29), p. 33170-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 30, No. 18 ( 2022-08-29), p. 33170-
    Abstract: In this paper, we propose a real scene acquisition and holographic near-eye display system based on a zoom industrial endoscope. By controlling the driving current of the liquid lens, the working distance and focal length of the zoom industrial endoscope can be tuned accordingly. Thus, the object at different depths can be captured. Then, the sub-sampling algorithm is used to generate the hologram. By adjusting the hologram sampling rate of the objects with different depths, the holographic near-eye 3D display can be realized. Experimental results demonstrate that the working distance of the zoom industrial endoscope can be tuned from 20 mm to 200 mm with the driving current changing from 80 mA to 190 mA. With the proposed system, the human eye can intuitively see the depth relationships among the real objects. The proposed system is expected to be applied to 3D display and industrial inspection fields.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.468267
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
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  • 8
    Online Resource
    Online Resource
    Efficient tandem organic light-emitting diodes with non-doped structures
    Optica Publishing Group ; 2020
    In:  Optics Letters Vol. 45, No. 23 ( 2020-12-01), p. 6450-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 45, No. 23 ( 2020-12-01), p. 6450-
    Abstract: Highly efficient tandem organic light-emitting diodes (TOLEDs) were achieved based on a non-doped charge generation unit (CGU) consisting of LiF/Al/C60/4,4’,4”-tris(N-3-methylphenyl-N-phenyl-amino) triphenylamine (m-MTDATA) and ultrathin emitting layers. The current–voltage characteristics of the CGU devices and electron-only devices and the capacitance–voltage characteristics of the CGU-based capacitance devices were characterized to explore the charge generation and injection mechanisms. The charge generation process occurs at the interface of C60/m–MTDATA through electron transferring from the highest occupied molecular orbital of m-MTDATA to the lowest unoccupied molecular orbital of C60. It is found that the thinner C60 layer contributes to efficient electron injection. Under the optimal structure, the blue TOLEDs exhibit a maximum current efficiency ( C E max ) of 43.3 cd/A. The C E max and maximum external quantum efficiency ( E Q E max ) of the white TOLEDs reach 84.6 cd/A and 26.7%, respectively.
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.409613
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2020
    detail.hit.zdb_id: 243290-0
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  • 9
    Online Resource
    Online Resource
    Holographic display method to suppress speckle noise based on effective utilization of two spatial light modulators
    Optica Publishing Group ; 2019
    In:  Optics Express Vol. 27, No. 8 ( 2019-04-15), p. 11617-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 27, No. 8 ( 2019-04-15), p. 11617-
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.27.011617
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2019
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  • 10
    Online Resource
    Online Resource
    Optical coherence elastography to evaluate depth-resolved elasticity of tissue
    Optica Publishing Group ; 2022
    In:  Optics Express Vol. 30, No. 6 ( 2022-03-14), p. 8709-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 30, No. 6 ( 2022-03-14), p. 8709-
    Abstract: Skin-elasticity measurements can assist in the clinical diagnosis of skin diseases, which has important clinical significance. Accurately determining the depth-resolved elasticity of superficial biological tissue is an important research direction. This paper presents an optical coherence elastography technique that combines surface acoustic waves and shear waves to obtain the elasticity of multilayer tissue. First, the phase velocity of the high-frequency surface acoustic wave is calculated at the surface of the sample to obtain the Young's modulus of the top layer. Then, the shear wave velocities in the other layers are calculated to obtain their respective Young's moduli. In the bilayer phantom experiment, the maximum error in the elastic estimation of each layer was 2.2%. The results show that the proposed method can accurately evaluate the depth-resolved elasticity of layered tissue-mimicking phantoms, which can potentially expand the clinical applications of elastic wave elastography.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.451704
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
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