• Title/Summary/Keyword: BK7 유리

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Micro-machining inside of a transparent glass (투명유리 내부의 컬러 미세형상 가공)

  • Kim Y.M.;Yoo B.H.;Cho S.H.;Chng W.S.;Kim J.G.;Whang K.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.209-210
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    • 2006
  • We have successfully termed brown colored patterns inside of a transparent borosilicate glass generally known as BK7, laying the focus of near infrared Ti: sapphire femtosecond laser beam in the bulk BK7 glass. It is important to keep the laser power well below the damage threshold of BK7 in forming the color center. Thanks to the low laser power, there was no laser induced mechanical damage such as cracks or threads in the color formed area. From the absorbance spectrum and its gaussian fitting, we found the band gap of BK7, 4.21eV, and three absorption edges.

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Color modification inside a transparent glass(BK7) using a femtosecond laser (펨토초 레이저 기반 투명유리(BK7) 내부의 컬러 미세형상 가공)

  • Kim, Hoon-Young;Yoon, Ji-Wook;Choi, Won-Seok;Park, Jung-Kyu;Choi, Ji-Yeon;Kim, Jae-Goo;Whang, Kyoung-Hyun;Cho, Sung-Hak
    • Laser Solutions
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    • v.15 no.3
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    • pp.16-19
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    • 2012
  • We have successfully formed brown colored patterns inside of a transparent borosilicate glass generally known as BK7, laying the focus of near infrared Ti: sapphire femtosecond laser beam in the bulk BK7 glass. It is important to keep the laser power well below the damage threshold of BK7 in forming the color center. According to the low laser power, there was no laser induced mechanical damage such as cracks or threads in the color formed area. From the absorbance spectrum and its gaussian fitting, we found the band gap of BK7, 4.21eV, and three absorption edges.

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A modeling and fabrication of 1.31/l.55$\mu\textrm{m}$ demultiplexer using glass integrated optics (유리집적광학을 이용한 1.31/1.55$\mu\textrm{m}$ 역다중화기 모델링 및 제작)

  • 강동성;장명호;반재경
    • Proceedings of the Optical Society of Korea Conference
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    • 2000.08a
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    • pp.158-159
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    • 2000
  • 본 논문에서는 BK7 유리 기판에 Ag$^{+}$-$Na^{+}$ 이온교환법을 이용하여 1.31/1.55$mu extrm{m}$ 방향성 광결합기형 역다중화기를 제작하여 특성을 평가하였다. BK7에 이온교환법을 이용하여 도파로를 제작할 경우 0.2dB/cm 이하의 전파손실을 유지할 수 있으며 또한 도파로의 굴절율 분포가 단일모드 광섬유와 매우 유사하여 광섬유와 광소자 사이의 접합면에서 발생하는 접합손실을 줄일 수 있다 또한 BK7을 이용하면 도파로를 제작하였을 때 복굴절 현상이나 편광 의존성이 적어서 수동 소자 제작에 유용하다는 장점이 있다$^{(1 3)}$ . (중략)

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Dutile Regime Parallel Grinding of BK7 (BK7의 평행축 연성모드 연삭가공)

  • Lee, Hyeon-Sung;Kim, Min-Jae;Koo, Hal-Bon;Hwang, Yeon;Kim, Hye-Jeong;Kim, Jeong-Ho
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.21 no.1
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    • pp.85-89
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    • 2012
  • Conventional grinding of BK7 glass will normally result in brittle fracture at the surface, generating severe sub-surface damage and poor surface finish. The precision grinding of BK7 glass in parallel grinding modes has been investigated. Grinding process, maximum chip thickness, ductile/brittle regime, surface roughness and sub-surface damage have been addressed. Special attention has been given to the condition for generating a ductile mode response on the ground surface. Experiments reveal that the level of surface roughness and depth of sub-surface damage vary differently for different condition. This study gives an indication of the strategy to follow to achieve high quality ground surfaces on brittle materials.

Characterization of Planar Optical Waveguides by Ag$^{+}$ -Na$^{+}$ Ion Exchange in BK7 Glass (Ag$^{+}$ -Na$^{+}$이온교환법을 이용한 BK7 유리 평판형 광도파로의 특성)

  • 전금수;반재경
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.35D no.1
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    • pp.84-93
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    • 1998
  • Planar graded index optical waveguides have been formed by Ag$^{+}$ ion exchange in the BK7 optical glass. The experimental results of diffusion and modal characteristics of Ag$^{+}$-Na$^{+}$ exchanged BK7 glass waveguides are presented. Measurements of the mode indices have been measured. We found the relations between the process and device parameters such as the diffusion depth and the square root of the diffusion time, diffusion coefficient and diffusion temperature, and diffusion ion concentration and surface index change. A theoretical gaussian function refractive index profile matched best with the measured data for all the guided modes. The empirical relations between the process and the device parameters are derived and subsequently used to formulate a systematic procedure for fabricating singlemode and multimode waveguides.uides.

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Fabrication of multi-mode interference $1\times4$ optical power splitter using glass integrated optics (유리집적광학을 이용한 다중모드간섭 $1\times4$ 광파워 분리기 제작)

  • 강동성;전금수;장명호;반재경
    • Korean Journal of Optics and Photonics
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    • v.11 no.6
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    • pp.418-422
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    • 2000
  • In this paper, we have modeled and fabricated a mutimode interference (MMI) $1\times4$ optical power splitter using finite-difference beam propagation method and $Ag^+-Na^+$ ion-exchanged method in BK7 glass. The power splitting ratio of the fabricated MMI $1\times4$ optical power splitter shows 0.46 dB..46 dB.

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Characteristic of the femtosecond laser machining in glass (펨토초 레이어 기반 유리 내부가공 특성)

  • Yoo B.H.;Kim Y.M.;Cho S.H.;Chang W.S.;Kim J.G.;Whang K.H.;Lee D.J.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.239-240
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    • 2006
  • For longer than picosecond pulses, bulk damage inside defect-free dielectrics involves the heating and multiplication of spurious electrons by the incident laser beam and transfer of this energy to the lattice. The situation is quite different for femtosecond pulses which are shorter than the time scale for electron energy transfer to the lattice. Damage caused by these pulses is produced with smaller statistical uncertainty and is controllable on a microscopic scale. These properties can be exploited to produce laser devices such as arrays of damage dots for all optical memories with high data storage density or arrays of parallel grooves to form transmission gratings. In this work, we observed characteristic of the femtosecond laser machining in BK7 and fused silica.

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An Experimental Study of Ultra-Precision Turning of Optical Glass(BK7) (광학유리(BK7) 초정밀절삭의 실험적 연구)

  • Kim, Min-Jae;Lee, June-Key;Yun, Yeong-Gon;Lee, Hyeon-Sung;Hwang, Yeon;Kim, Hye-Jeong;Kim, Jeong-Ho
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.20 no.4
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    • pp.382-385
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    • 2011
  • There is an immense need to obtain nanometric surface finish on optical glass owing to the advantage of improved performance of the components. But owing to brittleness and hardness, optical glass is one of the materials that is difficult to ultra-precision turning. According to the hypothesis of ductile mode machining, regardless of their hardness and brittleness, will undergo a transition from brittle to ductile machining region below a critical undeformed chip thickness. Below this threshold, it is suggested that the energy required for plastic formation. Thus, plastic deformation is the predominant mechanism of material removal in machining these materials in this mode. An experimental study is conducted diamond cutting for machining BK7 glass. The investigation presents the feasibility of achieving nanometric surface and the understanding the mechanism of cutting glass, proving the cutting edge radius effect.

A design and fabrication of asymmetric Y-branch optical power splitters by $Ag^+-Na^+$ ion exchange ($Ag^+-Na^+$ 이온교환법을 이용한 비대칭형 Y-분리기의 설계 및 제작)

  • 전금수;강동성;김희주;반재경
    • Korean Journal of Optics and Photonics
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    • v.12 no.4
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    • pp.320-326
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    • 2001
  • In this paper, we have fabricated asymmetric Y-branch optical power splitters with various optical power splitting ratios by changing the width of one of the output waveguides using $Ag^+-Na^+$ ion change method in BK7 glass. The transmission characteristics of asymmetric Y-branch optical power splitters with different output waveguide width have been investigated using the finitedifference beam propagation method (FD-BPM). We have found the index of the channel waveguide formed by Ag+-Na+ ion change method in BK7 glass and have fabricated channel waveguides to examine the transmission characteristics of channel waveguide. And we have fabricated asymmetric Y-branch optical power splitters with output waveguide width from TEX>$4{\mu}m$ to $6{\mu}m$. /TEX>.

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Effect of Cultivation Type and Shading on the Growth Characteristics of Lilium Oriental Hybrids Grown for Seed Bulbs in Highland in Summer (하계 고랭지에서 종구 생산시 재배형태와 차광에 따른 오리엔탈나리의 생육 특성)

  • Cho, Woo Sug;Park, Yoo Gyeong;Jeong, Byoung Ryong
    • FLOWER RESEARCH JOURNAL
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    • v.19 no.1
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    • pp.1-7
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    • 2011
  • This study was carried out to establish a production system of cut flowers and bulbs of oriental hybrid lilies in highland in summer. In study, effect of cultivation type and shading was examined. The cultivation types used in the bulb production experiments were greenhouses with no cover, greenhouses with net screen (net screen house), and greenhouses with EVA roof cover and net screen sides (rain shelter house). Net screen and rain shelter houses had either 0 or 30% shading. Cultivation type had significant effect and shading had a minor effect on bulb production. The greatest yield and quality of produced bulbs were obtained in the rain shelter house with 30% shading. From the results of this study, it is concluded that dispersed production of high quality cut lily flowers and bulbs could be achieved during the summer in highland.