Optical Review最新文献

An efficient evaluation model of fusion splice with different transverse offset and angular misalignment for few mode fiber

IF 1.2 4区物理与天体物理

Optical Review Pub Date : 2024-11-30 DOI: 10.1007/s10043-024-00929-w

Feng Liu, Zhicheng Huang, Tianle Gu, Ping Wu

{"title":"An efficient evaluation model of fusion splice with different transverse offset and angular misalignment for few mode fiber","authors":"Feng Liu, Zhicheng Huang, Tianle Gu, Ping Wu","doi":"10.1007/s10043-024-00929-w","DOIUrl":"https://doi.org/10.1007/s10043-024-00929-w","url":null,"abstract":"In this paper, based on a scale-adapted set of Laguerre-Gaussian modes, a theoretical model has been presented for evaluating the coupling efficiency of modes and mode crosstalk between different spatial modes caused by transverse offset and angular misalignments. A proof-of-model demonstration is performed for three-mode fiber, and the results show that the coupling efficiency and mode crosstalk of various modes behaves differently in the presence of axial offset and the direction of the misalignment. And it is also demonstrated that the proposed scheme can be scalable to analyze the FMFs with a large number of modes. On the basis of this model, the tolerance of coupling efficiency to the fusion splice conditions with different FMF parameter is analyzed. The results show that the larger the FMF normalized frequency V, the smaller the tolerance of spatial mode coupling to the transverse offset value. With the increase of V value, the tolerance of self-coupling efficiency and mode crosstalk to angular misalignments changes regularly. Therefore, the transverse offset and angular misalignments of fusion splice with different FMF parameters need to be strictly controlled to achieve suitable mode coupling efficiency and mode crosstalk.","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"11 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142753774","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}

引用次数: 0

Correction to: Effect of MoS2 and (phosphorene, germanene, borophene) hybrid structure on the performance of an SPR biosensor for detection of bacteria

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-11-24 DOI: 10.1007/s10043-024-00933-0

Mohammad Hadi Shahrokh Abadi, Amir Davami

引用次数: 0

Fundamental evaluation of the pseudo-3D perception of 2D aerial virtual images 二维航空虚拟图像的伪三维感知基础评估

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-11-20 DOI: 10.1007/s10043-024-00930-3

Kenta Saito, Haruki Mizushina, Kenji Yamamoto

引用次数: 0

Hue-preserving image enhancement for the elderly based on wavelength-dependent gamma correction 基于波长伽马校正的老年人图像色调保护增强技术

IF 1.2 4区物理与天体物理

Optical Review Pub Date : 2024-11-19 DOI: 10.1007/s10043-024-00932-1

Manaka Yamaguchi, Ayaka Fujita, Mashiho Mukaida, Chiaki Ueda, Tadahiro Azetsu, Noriaki Suetake

引用次数: 0

Improvement in image gaps and viewing angle of space-saving compact aerial display 改进节省空间的紧凑型航空显示器的图像间隙和视角

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-11-15 DOI: 10.1007/s10043-024-00928-x

Daichi Tasaki, Akinori Tsuji, Toyotaro Tokimoto, Shiro Suyama, Hirotsugu Yamamoto

引用次数: 0

Hybrid network with difficult–easy learning for concealed object detection in imbalanced terahertz image dataset 在不平衡太赫兹图像数据集中利用难易学习混合网络进行隐蔽物体检测

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-11-14 DOI: 10.1007/s10043-024-00927-y

Pengfei Yang, Shaojuan Luo, Meiyun Chen, Genping Zhao, Heng Wu, Chunhua He

{"title":"Hybrid network with difficult–easy learning for concealed object detection in imbalanced terahertz image dataset","authors":"Pengfei Yang, Shaojuan Luo, Meiyun Chen, Genping Zhao, Heng Wu, Chunhua He","doi":"10.1007/s10043-024-00927-y","DOIUrl":"10.1007/s10043-024-00927-y","url":null,"abstract":"<div>Terahertz imaging technology has been widely used in security inspections due to its ability to detect various concealed hazardous materials and the advantage of being harmless to the human body. However, limited by the terahertz imaging system, it is challenging to detect concealed objects due to hard samples and imbalanced categories caused by terahertz image quality. To solve these issues, we propose a hybrid network with difficult–easy learning (DEL) for concealed object detection in the imbalanced activated terahertz image dataset. Based on the one-stage framework YOLOv5m, a path aggregation hybrid structure (PAHS) is proposed to improve the performance of the proposed network while maintaining real-time detection. Specifically, PAHS with transformer block (TB) and a fine-tuned global context attention (GCA) are designed to fully exploit and fuse the multi-scale information by path aggregation, which improves the detection accuracy of low contrast and noise-interfered objects. To solve the problem of imbalanced categories in the activated terahertz dataset, a DELoss is developed to guide the network classification. Moreover, EIOU is adopted to boost the network training, and a modified B-Ocl loss is used to discriminate the positive and negative samples. Experiments are conducted on a public imbalanced activate terahertz image dataset. The experimental results illustrate that the proposed network achieves competitive performance compared with recently reported state-of-the-art detection methods. Moreover, the proposed method improves the balanced detection ability of different categories.</div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"31 Japan","pages":"702 - 718"},"PeriodicalIF":1.1,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142637896","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}

引用次数: 0

Age-based effects of yellow lenses on discomfort glare from white LED headlights 基于年龄的黄色镜片对白色 LED 大灯产生的不适眩光的影响

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-11-08 DOI: 10.1007/s10043-024-00926-z

Tatsuya Iizuka, Takushi Kawamorita, Hitoshi Ishikawa

{"title":"Age-based effects of yellow lenses on discomfort glare from white LED headlights","authors":"Tatsuya Iizuka, Takushi Kawamorita, Hitoshi Ishikawa","doi":"10.1007/s10043-024-00926-z","DOIUrl":"10.1007/s10043-024-00926-z","url":null,"abstract":"<div>This study aimed to explore the effectiveness of yellow glasses in reducing discomfort glare caused by white light-emitting diode headlights during night-time driving. The 30 visually normal participants were categorized into two age groups: 15 younger adults (mean age = 21.0 ± 1.6 years) and 15 older adults (mean age = 71.0 ± 1.6 years). Participants, simulating a driving position, assessed discomfort glare from glare sources (high- and low-beam headlights of oncoming vehicles) located 40 m away using the de Boer scale. Yellow glasses meeting night driving standards were found to have no significant impact on discomfort glare compared to neutral density filters with identical luminous transmittance, across all age groups. These findings imply that the ability of yellow glasses to partially block blue light, prevalent in white light-emitting diode headlights, does not alleviate discomfort glare. In conclusion, yellow glasses with a luminous transmittance of 75% or higher, meeting night driving standards, do not reduce discomfort glare caused by white LED headlights, regardless of the age group of the driver.</div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"31 Japan","pages":"626 - 632"},"PeriodicalIF":1.1,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597779","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}

引用次数: 0

Improved ternary composite ceramic phosphors for warm-white laser lighting 用于暖白激光照明的改进型三元复合陶瓷荧光粉

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-11-08 DOI: 10.1007/s10043-024-00925-0

Hisashi Minemoto, Kana Fujioka, Hiroshi Fuji, Kazuhisa Yamamoto, Tsuneo Kusunoki, Seika Tokumitsu, Hideo Kawabe

{"title":"Improved ternary composite ceramic phosphors for warm-white laser lighting","authors":"Hisashi Minemoto, Kana Fujioka, Hiroshi Fuji, Kazuhisa Yamamoto, Tsuneo Kusunoki, Seika Tokumitsu, Hideo Kawabe","doi":"10.1007/s10043-024-00925-0","DOIUrl":"10.1007/s10043-024-00925-0","url":null,"abstract":"<div>The large thermal conductivity of phosphor materials is crucial for laser lighting. Since the laser beam for pumping is focused on a small spot size (usually less than 1 mm2), heat generation is unavoidable at this point. Composite ceramic phosphors for cool-white laser lighting, the correlated color temperature of which is around 5000 K, produced by mixing of yellow photoluminescent light from Y3A5O12:Ce (YAG:Ce) with unutilized pumping blue light, were well studied. However, composite ceramic phosphors for warm-white around 3000 K are not as researched; this is because the difficulties in sintering nitride phosphors which are useful as red or orange phosphors. We have proposed improved ternary composite ceramic phosphors for warm-white laser lighting. The ceramic phosphors utilize a red phosphor: ((Ba,Sr)2Si5N8:Eu), a yellow phosphor: (YAG:Ce), and a thermal conducting matrix: (Al2O3). There are two types of composite ceramics: Type A with higher emission efficiency, and Type B more effective for warm light. These composite ceramic phosphors have higher saturation input laser power than our previous one, in which Sr2Si5N8 was utilized as a red phosphor. The improved ceramic phosphors (Type A) do not have a saturation peak of at least up to 16 W (power density:20 W/mm2) pumping laser power, but our previous one had a saturation peak at 6 W (power density:7.6 W/mm2). We recently got a good sample, the correlated color temperature of which is 3422 K, output efficiency is 177 lm/W, and general color rendering index (Ra) is 65. The improved ternary composite ceramic phosphors are extremely useful for warm-white laser lighting.</div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"31 Japan","pages":"740 - 746"},"PeriodicalIF":1.1,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597780","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}

引用次数: 0

Analysis of sensory tests for visibility of blur-added and color-changed virtual characters for AR display 对 AR 显示器中添加模糊和改变颜色的虚拟字符可见度的感官测试分析

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-10-28 DOI: 10.1007/s10043-024-00923-2

Yuta Machigashira, Haruki Mizushina, Kenji Yamamoto

引用次数: 0

Effects of three wavelength-cut lenses on visual function in the photopic and mesopic conditions 三种波长切割镜片对近视和中近视条件下视觉功能的影响

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-10-23 DOI: 10.1007/s10043-024-00924-1

Tatsuya Iizuka, Tomoya Handa

{"title":"Effects of three wavelength-cut lenses on visual function in the photopic and mesopic conditions","authors":"Tatsuya Iizuka, Tomoya Handa","doi":"10.1007/s10043-024-00924-1","DOIUrl":"10.1007/s10043-024-00924-1","url":null,"abstract":"<div>This study aimed to explore the impact of three wavelength-cut (TWC) lenses, which allowed 75% luminance transmittance while blocking wavelengths < 420 nm, approximately 460 nm, and approximately 585 nm, on visual function and color perception, and aging interaction effect. This single-center study enrolled 30 participants into two groups including 15 young participants (age 21.4 ± 1.3 years) and 15 older participants (age 71.7 ± 1.7 years). We used TWC lenses and a neutral density (ND) filter to assess the wavelength-cut effects on visual acuity, contrast sensitivity, and cone contrast sensitivity. Visual acuity and contrast sensitivity were assessed under photopic (luminance 85–100 cd/m2) and mesopic conditions (luminance 0.8 cd/m2). Significant interactions between age and lens conditions were observed for contrast sensitivity under photopic conditions (Bonferroni corrected α = 0.025, F(1,28) = 7.98, P = 0.01, η2 = 0.003), suggesting that contrast sensitivity to white and black gratings is better with TWC lenses (75%) than with the ND filter in young participants (F(1,28) = 7.25, P = 0.01, η2 = 0.206). However, the lens condition did not affect visual acuity and had only a minimal effect on cone contrast sensitivity for each cone type. In conclusion, TWC lenses, despite their nearly colorless and transparent appearance, can selectively block specific wavelengths to improve contrast sensitivity, while minimally affecting color perception. However, since the effect size of these interactions is very small, the impact is limited, therefore glasses should be prescribed with caution for young individuals.</div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"31 Japan","pages":"694 - 701"},"PeriodicalIF":1.1,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142488514","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}

引用次数: 0