Pub Date : 2017-04-25DOI: 10.3807/KJOP.2017.28.2.068
So-Young Lee, Jong-Ung Lee
To minimize chromatic variations across a wavelength band, we suggest a new design that corrects the firstand second-order wavelength derivatives of the refractive power. Based on this method, a diffraction-limited collimator is designed. The design is very stable against wavelength change, as expected. The chromatic change of the effective focal length is less than 0.002% in the wavelength range from 360 to 410 nm.
{"title":"Optical Design of a Collimator Lens That Is Very Stable Against Chromatic Variation","authors":"So-Young Lee, Jong-Ung Lee","doi":"10.3807/KJOP.2017.28.2.068","DOIUrl":"https://doi.org/10.3807/KJOP.2017.28.2.068","url":null,"abstract":"To minimize chromatic variations across a wavelength band, we suggest a new design that corrects the firstand second-order wavelength derivatives of the refractive power. Based on this method, a diffraction-limited collimator is designed. The design is very stable against wavelength change, as expected. The chromatic change of the effective focal length is less than 0.002% in the wavelength range from 360 to 410 nm.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"28 1","pages":"68-74"},"PeriodicalIF":0.1,"publicationDate":"2017-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44248591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-25DOI: 10.3807/KJOP.2017.28.2.053
H. Kim, Seung-Hun Oh, Hyunjong Choi, Junhyuk Park, Hyun-Yong Lee
This paper presents the design and fabrication of a planar nano-diffraction grating for an integrated miniature spectrometer module. The proposed planar nano-diffraction grating consists of nonuniform periods, to focus the reflected beams from the grating’s surface, and an asymmetrical V-shaped groove profile, to provide uniform diffraction efficiency in the wavelength range from 400 to 650 nm. Also, to fabricate the nano-diffraction grating using low-cost UV-NIL technology, we analyzed the FT-IR spectrum of a uv-curable resin and optimized the conditions for the UV curing process. Then, we precisely fabricated the polymeric nano-diffraction grating within 5 nm in dimensional accuracy. The integrated spectrometer module using the fabricated polymeric planar nano-diffraction grating provides spectral resolution of 5 nm and spectral bandwidth of 250 nm. Our integrated spectrometer module using a polymeric planar nano-diffraction grating serves as a quick and easy solution for many spectrometric applications.
{"title":"Fabrication of a Polymeric Planar Nano-diffraction Grating with Nonuniform Pitch for an Integrated Spectrometer Module","authors":"H. Kim, Seung-Hun Oh, Hyunjong Choi, Junhyuk Park, Hyun-Yong Lee","doi":"10.3807/KJOP.2017.28.2.053","DOIUrl":"https://doi.org/10.3807/KJOP.2017.28.2.053","url":null,"abstract":"This paper presents the design and fabrication of a planar nano-diffraction grating for an integrated miniature spectrometer module. The proposed planar nano-diffraction grating consists of nonuniform periods, to focus the reflected beams from the grating’s surface, and an asymmetrical V-shaped groove profile, to provide uniform diffraction efficiency in the wavelength range from 400 to 650 nm. Also, to fabricate the nano-diffraction grating using low-cost UV-NIL technology, we analyzed the FT-IR spectrum of a uv-curable resin and optimized the conditions for the UV curing process. Then, we precisely fabricated the polymeric nano-diffraction grating within 5 nm in dimensional accuracy. The integrated spectrometer module using the fabricated polymeric planar nano-diffraction grating provides spectral resolution of 5 nm and spectral bandwidth of 250 nm. Our integrated spectrometer module using a polymeric planar nano-diffraction grating serves as a quick and easy solution for many spectrometric applications.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"28 1","pages":"53-58"},"PeriodicalIF":0.1,"publicationDate":"2017-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42875248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-02-25DOI: 10.3807/KJOP.2017.28.1.022
Hansol Jang, G. Kim, Ga-Hee Han, Jaedu Cho, Chang-Seok Kim
Time-encoded near-infrared spectroscopy (NIRS) system is proposed, based on a near-infrared (NIR) swept laser source, for comparison to the conventional NIRS method using a detector-type spectrometer. The cavity of the NIR swept laser source consists of a semiconductor optical amplifier (SOA) with a gain region around 800 nm, and several fiber-optic components. To change the output wavelength in time using an applied electric radio-frequency signal, an acousto-optic tunable filter (AOTF) is introduced in the fiber ring cavity configuration. To demonstrate the feasibility of an NIR swept laser source for NIRS imaging, the spectroscopic comparison of two kinds of absorbance-measuring systems a detector-type spectrometer using a white light source, and a source-type spectrometer using an NIR swept laser is successfully performed with an NIR-absorbing dye.
{"title":"Time-encoded Near-infrared (NIR) Spectroscopic Comparison of Absorbance Measurement Using an Acousto-optic NIR Swept Laser Source","authors":"Hansol Jang, G. Kim, Ga-Hee Han, Jaedu Cho, Chang-Seok Kim","doi":"10.3807/KJOP.2017.28.1.022","DOIUrl":"https://doi.org/10.3807/KJOP.2017.28.1.022","url":null,"abstract":"Time-encoded near-infrared spectroscopy (NIRS) system is proposed, based on a near-infrared (NIR) swept laser source, for comparison to the conventional NIRS method using a detector-type spectrometer. The cavity of the NIR swept laser source consists of a semiconductor optical amplifier (SOA) with a gain region around 800 nm, and several fiber-optic components. To change the output wavelength in time using an applied electric radio-frequency signal, an acousto-optic tunable filter (AOTF) is introduced in the fiber ring cavity configuration. To demonstrate the feasibility of an NIR swept laser source for NIRS imaging, the spectroscopic comparison of two kinds of absorbance-measuring systems a detector-type spectrometer using a white light source, and a source-type spectrometer using an NIR swept laser is successfully performed with an NIR-absorbing dye.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"28 1","pages":"22-27"},"PeriodicalIF":0.1,"publicationDate":"2017-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42190529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-02-25DOI: 10.3807/KJOP.2017.28.1.009
Geun-Jae Lee, H. Cho, Jae Heung Jo
실리콘 기판으로 만든 바이오센서에서 펩타이드-항체의 접합 동특성을 회전 타원분광계로 정밀하게 측정하고 분석하였다. 극도로 낮은 몰농도의 펩타이드를 측정할 때, 시료가 놓이는 바이오센서의 표면의 불완전한 편평도와 완충용액 굴절률 변화로 인한 측정오차를 줄이기 위하여 금속박막의 유리 프리즘 대신에 실리콘 ...
{"title":"Measurement and Analysis of the Dynamics of Peptide-Antibody Interactions Using an Ellipsometric Biosensor Based on a Silicon Substrate","authors":"Geun-Jae Lee, H. Cho, Jae Heung Jo","doi":"10.3807/KJOP.2017.28.1.009","DOIUrl":"https://doi.org/10.3807/KJOP.2017.28.1.009","url":null,"abstract":"실리콘 기판으로 만든 바이오센서에서 펩타이드-항체의 접합 동특성을 회전 타원분광계로 정밀하게 측정하고 분석하였다. 극도로 낮은 몰농도의 펩타이드를 측정할 때, 시료가 놓이는 바이오센서의 표면의 불완전한 편평도와 완충용액 굴절률 변화로 인한 측정오차를 줄이기 위하여 금속박막의 유리 프리즘 대신에 실리콘 ...","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"28 1","pages":"9-15"},"PeriodicalIF":0.1,"publicationDate":"2017-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48942519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-02-25DOI: 10.3807/KJOP.2017.28.1.001
Young-jin Jung, Kwang Lee
A method for inspecting defects in display substrates utilizing Fourier optics is proposed in this paper. A cost-effective inspection system can be realized with the proposed method, because it does not require a high-magnification microscope. Also, the proposed method can avoid tight tolerance for variations in displacement between substrate and camera, which is stems from shallow depth of field of the high-magnification microscope. In addition, possible damage caused by collisions between substrate and the inspection equipment can be avoided. The decision algorithm can be simpler than for a conventional inspection system, because spatial shift of periodic substrate patterns does not affect the intensity distribution of the diffracted light, by the Fourier transform property. The proposed method is explained with numerical studies, and experiments are carried out to check its feasibility for color-filter substrates of a liquid-crystal display.
{"title":"Application of Fourier Optics to Defect Inspection of Display Substrates","authors":"Young-jin Jung, Kwang Lee","doi":"10.3807/KJOP.2017.28.1.001","DOIUrl":"https://doi.org/10.3807/KJOP.2017.28.1.001","url":null,"abstract":"A method for inspecting defects in display substrates utilizing Fourier optics is proposed in this paper. A cost-effective inspection system can be realized with the proposed method, because it does not require a high-magnification microscope. Also, the proposed method can avoid tight tolerance for variations in displacement between substrate and camera, which is stems from shallow depth of field of the high-magnification microscope. In addition, possible damage caused by collisions between substrate and the inspection equipment can be avoided. The decision algorithm can be simpler than for a conventional inspection system, because spatial shift of periodic substrate patterns does not affect the intensity distribution of the diffracted light, by the Fourier transform property. The proposed method is explained with numerical studies, and experiments are carried out to check its feasibility for color-filter substrates of a liquid-crystal display.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"28 1","pages":"1-8"},"PeriodicalIF":0.1,"publicationDate":"2017-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46259746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-02-25DOI: 10.3807/KJOP.2017.28.1.028
Heesang Ahn, T. Kang, Jin-Woo Oh, Kyujung Kim
본 논문에서는 LSPR 센서에 적용하기 위한 제한된 높이 100 nm에서 $TiO_2$ , $SiO_2$ 의 다중층을 이용한 LSPR 센서를 디자인을 제안했다. LSPR 센서의 구조는 유전체 층과 나노 구조가 있는 금속층으로 디자인 하였다. 금속층은 금 박막 40 nm와 높이 40 nm, 주기 600 nm, 선폭 300 nm인 나노와이어 구조체를 올려놓...
{"title":"Estimation of Sensitivity Enhancements on Localized Surface Plasmon Resonance Sensor Using Dielectric Multilayer","authors":"Heesang Ahn, T. Kang, Jin-Woo Oh, Kyujung Kim","doi":"10.3807/KJOP.2017.28.1.028","DOIUrl":"https://doi.org/10.3807/KJOP.2017.28.1.028","url":null,"abstract":"본 논문에서는 LSPR 센서에 적용하기 위한 제한된 높이 100 nm에서 $TiO_2$ , $SiO_2$ 의 다중층을 이용한 LSPR 센서를 디자인을 제안했다. LSPR 센서의 구조는 유전체 층과 나노 구조가 있는 금속층으로 디자인 하였다. 금속층은 금 박막 40 nm와 높이 40 nm, 주기 600 nm, 선폭 300 nm인 나노와이어 구조체를 올려놓...","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"28 1","pages":"28-32"},"PeriodicalIF":0.1,"publicationDate":"2017-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44928505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-02-25DOI: 10.3807/KJOP.2017.28.1.016
Seung-man Park, Sang-Wook Kim
A systematic understanding of the effects of high-intensity flash sources on the human eye is strongly needed, not only for proper use of the sources, but for human eye health. In this study, the exposure-limit distance (ELD), indicating the minimal safe distance in case of seeing by chance a high-intensity flash, is proposed. The optical procedures to determine the ELD of a high-intensity flash are clarified, and the dependence of ELD on its parameters such as luminous intensity, duration, and radius of a flash are thoroughly investigated. From this investigation it is obvious that, while being weakly dependent on duration, the ELD is nearly proportional to the luminous intensity and the radius of a flash. The proposed ELD as an intuitive safety-indicating parameter is more useful and intuitive than the other characteristic parameters of a high-intensity flash. The ELD is expected to be an essential parameter as a safety indicator, to characterize the performance of a high-intensity flash and to promote the safety of the human eye.
{"title":"Exposure-Limit Distance as a Safety-Indicating Parameter of a High-Intensity Flash Source","authors":"Seung-man Park, Sang-Wook Kim","doi":"10.3807/KJOP.2017.28.1.016","DOIUrl":"https://doi.org/10.3807/KJOP.2017.28.1.016","url":null,"abstract":"A systematic understanding of the effects of high-intensity flash sources on the human eye is strongly needed, not only for proper use of the sources, but for human eye health. In this study, the exposure-limit distance (ELD), indicating the minimal safe distance in case of seeing by chance a high-intensity flash, is proposed. The optical procedures to determine the ELD of a high-intensity flash are clarified, and the dependence of ELD on its parameters such as luminous intensity, duration, and radius of a flash are thoroughly investigated. From this investigation it is obvious that, while being weakly dependent on duration, the ELD is nearly proportional to the luminous intensity and the radius of a flash. The proposed ELD as an intuitive safety-indicating parameter is more useful and intuitive than the other characteristic parameters of a high-intensity flash. The ELD is expected to be an essential parameter as a safety indicator, to characterize the performance of a high-intensity flash and to promote the safety of the human eye.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"28 1","pages":"16-21"},"PeriodicalIF":0.1,"publicationDate":"2017-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49268500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-02-25DOI: 10.3807/KJOP.2017.28.1.033
S. Y. Kim
The universality of the quasi-linear relation between the order parameter and the normalized birefringence , is confirmed. It is verified that the refractive index of liquid crystals distributed with regular polyhedral symmetry is isotropic and it is given as . and of angular weighted liquid crystals that are initially distributed with regular polyhedral symmetry, are numerically calculated. Also and of liquid crystals that are conically distributed, keeping the rotational symmetry about z-axis
The universality of the quasi-linear relation between the order parameter and the normalized birefringence , is confirmed. It is verified that the refractive index of liquid crystals distributed with regular polyhedral symmetry is isotropic and it is given as . and of angular weighted liquid crystals that are initially distributed with regular polyhedral symmetry, are numerically calculated. Also and of liquid crystals that are conically distributed, keeping the rotational symmetry about z-axis
{"title":"Universality of the Quasi-linear Relation Between the Order Parameter and the Normalized Birefringence of Aligned Uniaxially Anisotropic Molecules","authors":"S. Y. Kim","doi":"10.3807/KJOP.2017.28.1.033","DOIUrl":"https://doi.org/10.3807/KJOP.2017.28.1.033","url":null,"abstract":"The universality of the quasi-linear relation between the order parameter and the normalized birefringence , is confirmed. It is verified that the refractive index of liquid crystals distributed with regular polyhedral symmetry is isotropic and it is given as . and of angular weighted liquid crystals that are initially distributed with regular polyhedral symmetry, are numerically calculated. Also and of liquid crystals that are conically distributed, keeping the rotational symmetry about z-axis","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"28 1","pages":"33-38"},"PeriodicalIF":0.1,"publicationDate":"2017-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46538264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-06Epub Date: 2016-11-28DOI: 10.1074/jbc.M116.757500
Jisun Kim, Chulwoo Park, James A Imlay, Woojun Park
Bacteria use redox-sensitive transcription factors to coordinate responses to redox stress. The [2Fe-2S] cluster-containing transcription factor SoxR is particularly tuned to protect cells against redox-active compounds (RACs). In enteric bacteria, SoxR is paired with a second transcription factor, SoxS, that activates downstream effectors. However, SoxS is absent in non-enteric bacteria, raising questions as to how SoxR functions. Here, we first show that SoxR of Acinetobacter oleivorans displayed similar activation profiles in response to RACs as did its homolog from Escherichia coli but controlled a different set of target genes, including sinE, which encodes an endoribonuclease. Expression, gel mobility shift, and mutational analyses indicated that sinE is a direct target of SoxR. Redox potentials and permeability of RACs determined optimal sinE induction. Bioinformatics suggested that only a few γ- and β-proteobacteria might have SoxR-regulated sinE Purified SinE, in the presence of Mg2+ ions, degrades rRNAs, thus inhibiting protein synthesis. Similarly, pretreatment of cells with RACs demonstrated a role for SinE in promoting persistence in the presence of antibiotics that inhibit protein synthesis. Our data improve our understanding of the physiology of soil microorganisms by suggesting that both non-enteric SoxR and its target SinE play protective roles in the presence of RACs and antibiotics.
{"title":"Lineage-specific SoxR-mediated Regulation of an Endoribonuclease Protects Non-enteric Bacteria from Redox-active Compounds.","authors":"Jisun Kim, Chulwoo Park, James A Imlay, Woojun Park","doi":"10.1074/jbc.M116.757500","DOIUrl":"10.1074/jbc.M116.757500","url":null,"abstract":"<p><p>Bacteria use redox-sensitive transcription factors to coordinate responses to redox stress. The [2Fe-2S] cluster-containing transcription factor SoxR is particularly tuned to protect cells against redox-active compounds (RACs). In enteric bacteria, SoxR is paired with a second transcription factor, SoxS, that activates downstream effectors. However, SoxS is absent in non-enteric bacteria, raising questions as to how SoxR functions. Here, we first show that SoxR of Acinetobacter oleivorans displayed similar activation profiles in response to RACs as did its homolog from Escherichia coli but controlled a different set of target genes, including sinE, which encodes an endoribonuclease. Expression, gel mobility shift, and mutational analyses indicated that sinE is a direct target of SoxR. Redox potentials and permeability of RACs determined optimal sinE induction. Bioinformatics suggested that only a few γ- and β-proteobacteria might have SoxR-regulated sinE Purified SinE, in the presence of Mg<sup>2+</sup> ions, degrades rRNAs, thus inhibiting protein synthesis. Similarly, pretreatment of cells with RACs demonstrated a role for SinE in promoting persistence in the presence of antibiotics that inhibit protein synthesis. Our data improve our understanding of the physiology of soil microorganisms by suggesting that both non-enteric SoxR and its target SinE play protective roles in the presence of RACs and antibiotics.</p>","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"31 1","pages":"121-133"},"PeriodicalIF":0.0,"publicationDate":"2017-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5217672/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77918087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.3807/KJOP.2017.28.5.213
Seong-Hun Jang, Young-Gu Ju
This paper proposes how to fabricate an educational Mach-Zehnder interferometer that is easy to align and inexpensive, using 3D printers and semiconductor lasers. The interferometer consists of a body 165 mm × 120 mm × 57 mm in size, mirror mounts, a laser holder, beam splitters, and so on. The laser path is adjusted by 4 mirror mounts, each comprised of rubber bands, small metal wires, and a screw. The interference fringe is enlarged by the lens at the final stage. The refractive index of a slide glass was measured by counting the number of moving interference fringes while the slide glass, inserted into one of the two interferometer arms, is rotating. The formula for the refractive index as a function of the optical-path difference and rotation angle was obtained, and used to calculate the refractive index of glass from the interferometer experiment. The use of a rotating glass in one arm of the interferometer nullifies the need for a precision stage, which despite its high cost is often required to observe the moving interference fringe in the classroom. Therefore, the 3D-printed Mach-Zehnder interferometer proposed in this paper can be very useful for education, because of its affordability and performance. It enables students to perform both qualitative and quantitative studies using a 3D-printed interferometer, such as measuring the refractive index of a glass sample, and the wavelength of light.
{"title":"Fabrication of a Mach-Zehnder interferometer for education using a rotating glass plate and a 3D printer","authors":"Seong-Hun Jang, Young-Gu Ju","doi":"10.3807/KJOP.2017.28.5.213","DOIUrl":"https://doi.org/10.3807/KJOP.2017.28.5.213","url":null,"abstract":"This paper proposes how to fabricate an educational Mach-Zehnder interferometer that is easy to align and inexpensive, using 3D printers and semiconductor lasers. The interferometer consists of a body 165 mm × 120 mm × 57 mm in size, mirror mounts, a laser holder, beam splitters, and so on. The laser path is adjusted by 4 mirror mounts, each comprised of rubber bands, small metal wires, and a screw. The interference fringe is enlarged by the lens at the final stage. The refractive index of a slide glass was measured by counting the number of moving interference fringes while the slide glass, inserted into one of the two interferometer arms, is rotating. The formula for the refractive index as a function of the optical-path difference and rotation angle was obtained, and used to calculate the refractive index of glass from the interferometer experiment. The use of a rotating glass in one arm of the interferometer nullifies the need for a precision stage, which despite its high cost is often required to observe the moving interference fringe in the classroom. Therefore, the 3D-printed Mach-Zehnder interferometer proposed in this paper can be very useful for education, because of its affordability and performance. It enables students to perform both qualitative and quantitative studies using a 3D-printed interferometer, such as measuring the refractive index of a glass sample, and the wavelength of light.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"28 1","pages":"213-220"},"PeriodicalIF":0.1,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70159570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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