Jung-An Choi
Research Subjects
Research Interests
Jung-An Choi has a total of 9 co-authors. Here are the top co-authors by number of shared publications:
- Bosu Jeong
B2LAB Co., Ltd
1 shared publication - Byunghak Lee
Electro-Medical Device Research Center Korea Electrotechnology Research Institute 111 Hanggaul-ro Sangnok-gu 15588 Ansan-si Gyeonggi-do Republic of Korea
1 shared publication - Duchang Heo
Korea Electrotechnology Research Institute, Ansan, Hanggaulro 111, Korea
1 shared publication - Elena G. Sall
Electro-Medical Device Research Center Korea Electrotechnology Research Institute 111 Hanggaul-ro Sangnok-gu 15588 Ansan-si Gyeonggi-do Republic of Korea
1 shared publication - Guang-Hoon Kim
Korea Electrotechnol Res Inst, Electromed Device Res Ctr, 111 Hanggaul Ro, Ansan 15588, Gyeonggido, South Korea
1 shared publication - Jinah Jang
Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, Republic of Korea
1 shared publication
Latest Publications
- Open Access
- 28 March 2019
- Published by MDPI AG in Preprints.org
Drilling of Sub-100 μm Hourglass-Shaped Holes in Diamond with Femtosecond Laser Pulses
A Micro holes in a diamond are presented by using a homemade femtosecond (fs) Yb:KGW laser. An fs laser source was used emitting pulse duration of 230 fs at 1030 nm wavelength, whereas the spot size amounted to 8.9 μm. Parameters like pulse energy, and pulse number were varied over a wide range in order to evaluate their influence both on the micro hole geometry like hole diameter, circularity, taper angle, and on the drilling quality. Hourglass-shaped micro holes whose diameters decrease and increase again after a certain depth have important applications. The results demonstrate the feasibility of extending the drilling of an hourglass-shaped hole in a diamond sample, which has similar diameters at the hole entrance (92 μm) and exit (95 μm), but a much smaller diameter (28 μm) at a certain waist section inside the hole.
- 28 March 2019
- Published by MDPI AG in Preprints.org
Open AccessDrilling of Sub-100 μm Hourglass-Shaped Holes in Diamond with Femtosecond Laser Pulses
A Micro holes in a diamond are presented by using a homemade femtosecond (fs) Yb:KGW laser. An fs laser source was used emitting pulse duration of 230 fs at 1030 nm wavelength, whereas the spot size amounted to 8.9 μm. Parameters like pulse energy, and pulse number were varied over a wide range in order to evaluate their influence both on the micro hole geometry like hole diameter, circularity, taper angle, and on the drilling quality. Hourglass-shaped micro holes whose diameters decrease and increase again after a certain depth have important applications. The results demonstrate the feasibility of extending the drilling of an hourglass-shaped hole in a diamond sample, which has similar diameters at the hole entrance (92 μm) and exit (95 μm), but a much smaller diameter (28 μm) at a certain waist section inside the hole.