Optical Review最新文献

{"title":"Two-wavelength digital holography using frequency-modulated continuous-wave technique for multiplexing in the time–frequency domain","authors":"Hikaru Hamada,&nbsp;Masayuki Yokota","doi":"10.1007/s10043-023-00840-w","DOIUrl":"10.1007/s10043-023-00840-w","url":null,"abstract":"<div><p>In this study, we have proposed a digital holographic technique in which the frequency-modulated continuous-wave technique is introduced as a novel implementation of wavelength multiplexing in the time–frequency domain. In the proposed technique, the holograms are recorded with two wavelengths and the information of each hologram can be separated in the time–frequency domain by modulating the frequencies of two laser diodes at different modulation widths. Therefore, a temporal Fourier analysis is performed on each pixel of the time-series holograms whose intensity is modulated with two beat frequencies. And then, the holograms corresponding to the two wavelengths are extracted independently. Initially, a holographic system with two close wavelengths of 782.43 nm and 782.50 nm was designed to measure the surface profile of metallic gauge blocks with a known step-height of 1.16 mm in both experimental and numerical calculations. In addition, the measurement accuracy of the proposed system was investigated using both the experimental and the numerical results. Furthermore, the numerical calculation was conducted to investigate the origin of the periodic noise superimposed on the experimental results. Finally, the reduction method of the periodic noise was proposed, and the effect of the method was demonstrated using numerical calculations.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71492234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on coherent tracking technology based on signal beam nutation","authors":"Jingying Bian,&nbsp;Bin Ren,&nbsp;Qian Lu,&nbsp;Xiaoqi Liu,&nbsp;Le Zhang,&nbsp;Xuejiao Zhang","doi":"10.1007/s10043-023-00829-5","DOIUrl":"10.1007/s10043-023-00829-5","url":null,"abstract":"<div><p>The technology of coherent tracking based on signal beam nutation is presented in the paper. The working principle and advantage of the technology are analyzed. We provided the optical axis error detection algorithm and the selection method of nutation parameter. A simulation model of coherent tracking system was built, and the simulation results show that when half of the nutation angle is between 0.463 and 2 µrad, the degradation of the receiving sensitivity is less than 1 dB and the noise equivalent angle (NEA) is less than 0.02 μrad. When the nutation frequency is better than 10 kHz, the coherent tracking system can compensate vibration influence of some common satellite platform. The technology provides a new thought for free-space optical communication system design.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41084053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reflective ultra-wideband dual-band linear-to-circular polarization converter based on metasurface","authors":"Yuyuan Du,&nbsp;Rui Huang,&nbsp;Cunwei Zhang,&nbsp;Xiangjun Zhang","doi":"10.1007/s10043-023-00837-5","DOIUrl":"10.1007/s10043-023-00837-5","url":null,"abstract":"<div><p>A dual-frequency ultra-wideband line-to-circular polarization converter based on metasurfaces is proposed in this paper. The metasurface is composed of a symmetrical semicircular structure connected to a rectangular metal strip with a deflection direction at a 45° angle to the <i>y</i>-axis, and its dielectric substrate layer is fabricated on the metal layer. When <i>y</i>-polarized waves are incident, the polarization converter can convert linearly polarized incident waves into circularly polarized reflected waves. The frequency range with an axial ratio less than 3 dB is 14.0–20.1 THz and 23.5–37.4 THz, respectively. The obtained bandwidth is 6.1 THz and 13.9 THz, which generates left-handed circularly polarized waves (LCP) and right-handed circularly polarized waves (RCP). The linear circular polarization converter unit is compact and easy integration. When the oblique incidence angle is 40°, the minimum elliptical polarization conversion rate within the working axis ratio 3 dB bandwidth is above 80%. When the polarization angle is 20°, the elliptical polarization in the operating frequency band is also above 78%. As the reflective polarization converter has such excellent characteristics, which make it having high research value for electromagnetic devices in the terahertz frequency band.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41083983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficient MoS2-based passively Q-switched Nd:GGG laser at 1.4 μm under in band pumping","authors":"Hai-Feng Lin,&nbsp;Zhi-Chao Liu,&nbsp;Rui-Zhen Mu,&nbsp;Yi-Chen Liu,&nbsp;Wen-Zhang Zhu,&nbsp;Fei-Bing Xiong","doi":"10.1007/s10043-023-00836-6","DOIUrl":"10.1007/s10043-023-00836-6","url":null,"abstract":"<div><p>We demonstrated an efficient MoS₂-based eye-safe passively Q-switched Nd:GGG laser under 880 nm LD pumping. The maximum average output power was about 1.05 W with a slope efficiency of about 7.0%. The maximum pulse repetition rate and the shortest pulse width were 365.5 kHz and 146 ns respectively. To the best of our knowledge, this work represented the MoS₂ firstly used as a saturable absorber (SA) in Q-switched Nd:GGG laser operating at 1.4 μm wavelength, which deepened the understanding of the Q-switched performance of MoS₂ in this spectral region.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41084213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comparative evaluation of 2-D Hilbert transforms and 2-D continuous wavelet transforms for robust phase extraction in complex fringe patterns","authors":"Jyoti Singh,&nbsp;Divya Haridas,&nbsp;Anirban Bhowmick,&nbsp;Ramu Pasupathi Sugavaneshwar","doi":"10.1007/s10043-023-00833-9","DOIUrl":"10.1007/s10043-023-00833-9","url":null,"abstract":"<div><p>Interferometric techniques are widely used to obtain the real-time phenomena in a majority of applications considering its advantages of non-intrusively, mapping changes in path length as small as the wavelength of the light source used, etc. Interferometers often recorded the changes in the path length in the form of fringe orientation. Depending upon the complexity of the phenomena under observation, interferometric fringes are formed from simple fringe ordinations to complex fringe structures. Extracting phase map from these fringe patterns are highly crucial to evaluate the phase change and the corresponding property change. In order to use the interferometers in its full potential, it is necessary to develop robust and accurate algorithms for phase extraction. In this paper, we discuss 2-D Hilbert transforms (HT) and 2-D continuous wavelet transforms (CWT) techniques to analyze fringe patterns of different orientation and inter-fringe spacing. Simulated interferograms were used to generate implemented fringe patterns with different orientation and spacing. MATLAB software is used to generate these simulated image. In order to check the efficiency of the mentioned algorithm, a white Gaussian filter with different noise levels (0%, 5%, 10%) has been added to the simulated interferograms. Interferometric fringes with noise is a common phenomenon in many transient and turbulent processes. Moreover, the in-build noise in optical configuration and external noises in the testing environment also adds to the noise. Hence, it is necessary to test the accuracy of algorithm for enhanced noises. The results show that the HT algorithm was difficult to implement on complex patterns and was also difficult to implement for a high degree of noise interference. The two-dimensional CWT, on the other hand, has good performance on complex striped patterns and can handle noise disturbances with a good degree of accuracy. The continuous wavelet transform is insensitive to noise interference patterns and gives accurate results. The processing time is very short and it can handle both simple and complex fringe patterns within a very short period of time. It can also be concluded that the 2-D CWT algorithm is very effective and robust.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41084164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A relative humidity sensor based on 2-core fiber Michelson interferometer with end-face aluminium mirror","authors":"Jun-ni Cheng,&nbsp;Xiao-yan Jiang","doi":"10.1007/s10043-023-00834-8","DOIUrl":"10.1007/s10043-023-00834-8","url":null,"abstract":"<div><p>A relative humidity (RH) sensor based on in-fiber Michelson interferometer (MI) is proposed, which consists of a short piece of graded-index multimode fiber (GIMMF) followed by a 2-core fiber (2CF), whose end face is terminated by a thick aluminum film. The GIMMF excites cladding modes into the pigtail 2CF via the mismatched-core splicing interface. The core-cladding modes are reflected back by the aluminum film and recoupled to the core of lead-in SMF through the GIMMF. A well-defined interference pattern is obtained as the result of core-cladding mode interference. The experimental results show that a configuration with a 10 mm pigtail 2CF at a wavelength of 1552.78 nm has a good linear response to relative humidity with the sensitivity of – 0.044 dB/%RH in the range of 35–95%RH. Meanwhile, the selected monitoring peak provides a better temperature sensitivity of 65 pm/℃ in the range of 35 –85 ℃. In addition, the aluminum film is manufactured by physical vapor deposition (PVD), which greatly enhances the compactness of the film and improves the contrast of the interference fringes; the manufacturing method has high repeatability.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41084157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Single-shot blind deconvolution in coherent diffraction imaging with coded aperture","authors":"Hideyuki Muneta,&nbsp;Ryoichi Horisaki,&nbsp;Yohei Nishizaki,&nbsp;Makoto Naruse,&nbsp;Jun Tanida","doi":"10.1007/s10043-023-00835-7","DOIUrl":"10.1007/s10043-023-00835-7","url":null,"abstract":"<div><p>We present a method for single-shot blind deconvolution in coherent diffraction imaging. Coherent diffraction imaging is a technique for non-interferometric quantitative phase imaging without reference light. In our method based on coherent diffraction imaging, a complex amplitude object is illuminated with coherent light, and light from the object is captured through unknown aberrating media and a coded aperture located on the pupil plane to reduce estimated variables on the aberrated pupil function. Both the amplitude and the phase of the object are recovered from the single captured intensity image by a phase retrieval algorithm in which the coded aperture is utilized as a support to estimate the sparse aberrated pupil function. We numerically and experimentally demonstrate the proposed method with complex amplitude objects under severe aberrating conditions. In the experiment, we quantitatively evaluate its performance with ptychography, which is a method for multi-shot coherent diffraction imaging. Our method enables quantitative phase imaging through turbulence by using simple and reference-free optical hardware without any invasive process.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10043-023-00835-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41083972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Approximated unsharp masking on equi-hue plane in RGB color space","authors":"Mashiho Mukaida,&nbsp;Noriaki Suetake","doi":"10.1007/s10043-023-00838-4","DOIUrl":"10.1007/s10043-023-00838-4","url":null,"abstract":"<div><p>Unsharp masking is a common method of image sharpening. If unsharp masking is applied to each RGB component of a color image, the hue of the output image is changed from that of the input image. A hue-preserving unsharp masking method has been proposed thus far. However, the effect of image sharpening is slightly small. In this paper, we propose a new hue-preserving unsharp masking method that sharpens the image effectively. In the proposed method, componentwise unsharp masking is approximated by linear transformation satisfying Naik’s hue-preserving condition, and the gamut problem is solved by processing in an equi-hue plane in an RGB color space. In the experiments, the effectiveness of the proposed method is verified by qualitative and quantitative evaluations.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10043-023-00838-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41084254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cuboid filter: simple edge-preserving smoothing","authors":"Shuma Takeda,&nbsp;Mashiho Mukaida,&nbsp;Noriaki Suetake","doi":"10.1007/s10043-023-00839-3","DOIUrl":"10.1007/s10043-023-00839-3","url":null,"abstract":"<div><p>In this letter, we propose a new edge-preserving smoothing filter, the cuboid filter. Since many applications for image processing and computer vision are based on the idea of denoising and extracting edges, the edge-preserving smoothing filter can be utilized in many applications, such as high dynamic range image compression, unsharp masking, stylization, and more. For this reason, various edge-preserving smoothing filters, such as the bilateral filter, the guided filter, and the domain transform, have been proposed. In general, these filters face a trade-off relationship between denoising performance and computational speed. The cuboid filter calculates only the mean of 3-dimensional neighboring pixels. The cuboid filter performs satisfactorily in reducing small-amplitude noise and fast filtering. On the basis of qualitative and quantitative evaluations, the effectiveness and the validity of the cuboid filter are shown.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10043-023-00839-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41084184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three wavelength cut lenses with improved contrast sensitivity and reduced lens color","authors":"Shuji Nakatsuka,&nbsp;Tomoya Handa,&nbsp;Hirotaka Ito,&nbsp;Tatsuya Iizuka,&nbsp;Kumiko Mokuno","doi":"10.1007/s10043-023-00831-x","DOIUrl":"10.1007/s10043-023-00831-x","url":null,"abstract":"<div><p>This study aimed to examine the effect of selective wavelength range-cutting lenses at the following three wavelengths: less than 420 nm, approximately 460 nm, and approximately 585 nm. Contrast sensitivity when wearing a selective three-wavelength range-cutting lens was higher than that of clear lenses; further, contrast sensitivity was improved in both non-glare and glare conditions in the testing room with an illuminance of approximately 500 lx. Selective three-wavelength range-cutting lenses could improve contrast sensitivity while reducing lens color. Therefore, multiple wavelength-controlled lenses can contribute to the improvement of the quality of vision in daily life.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41084163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}