Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Hwihyeong Lee"'
Autor:
Dong Joon Kim, Joonhoi Koo, Seung Won Jun, Hwanseong Jeong, Hwihyeong Lee, Jung Hwan Lee, Minsik Jo
Publikováno v:
Nanomaterials, Vol 13, Iss 8, p 1329 (2023)
We demonstrated a narrow-linewidth high-power Yb-doped polarization-maintaining (PM) fiber laser with near-diffraction-limited beam. The laser system consisted of a phase-modulated single-frequency seed source and four-stage amplifiers in the master
Externí odkaz:
https://doaj.org/article/4b78b602dc6b413c886c6cd978255cd9
Autor:
Hwihyeong Lee, Hee Kyung Ahn
Publikováno v:
Optical Engineering. 61
Publikováno v:
Journal of the Korean Physical Society. 76:819-823
Laser processing is an effective way for precisely and accurately removing a small region of materials without tool wear. Conventional laser processing, which has a limitation on the processing speed, is performed by scanning a single spot on a targe
Autor:
Dong Joon Kim, Joonhoi Koo, Seung Won Jun, Hwanseong Jeong, Kwanghyun Lee, Hwihyeong Lee, Jung Hwan Lee, Minsik Jo
Publikováno v:
Optica Advanced Photonics Congress 2022.
In this paper, we demonstrated high-power, narrow-linewidth Yb-doped PM fiber amplifier using bi-directional pumping. The PRBS phase modulated laser as seed source was used to suppress the SBS.
Publikováno v:
Optics express. 27(23)
Fourier ptychography uses a phase retrieval algorithm to reconstruct a high-resolution image with a wide field-of-view. Reflective-type Fourier ptychographic microscopy (FPM) is expected to be very useful for surface inspection, but the reported meth
Autor:
Hee Kyung Ahn, Hwihyeong Lee
Publikováno v:
SID Symposium Digest of Technical Papers. 50:1530-1532
Publikováno v:
Applied Physics B. 122
A hologram can be used for high-power laser processing applications such as cutting, drilling, patterning, or welding. However, not much progress has been made in cutting application compared to the others, because it requires optical reconstruction
Publikováno v:
SPIE Proceedings.
In KAIST, Kumgang laser is being developed for demonstration of the kW level coherent beam combination using stimulated Brillouin scattering phase conjugation mirrors. It will combine 4 modules of DPSSL rod amplifier which produces 1 kW output power.
Autor:
Hee Kyung Ahn, Sangwoo Park, Jom Sool Kim, Soungwoong Choi, Seongwoo Cha, Hwihyeong Lee, Jungsuk Oh, Bong Ju Lee, Hong Jin Kong
Publikováno v:
High Power Laser Science and Engineering. 3
In this review paper, we introduce a self-phase controlled stimulated Brillouin scattering phase conjugate mirror (SC-SBS-PCM) and the Kumgang laser. The SC-SBS-PCM was proposed and demonstrated its success at the academic low power level, ${\sim}100
Publikováno v:
Advanced Solid-State Lasers Congress.
The usual iterative Fourier transform algorithm causes speckle noise between the sampling points. By shifting the tiled holograms, the speckles noise changes and can be averaged out over a period.