http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Topological Insulators for Mode-Locking of 2-μm Fiber Lasers
Jhon, Young In,Lee, Jinho,Jhon, Young Min,Lee, Ju Han IEEE 2018 IEEE journal of selected topics in quantum electro Vol.24 No.5
<P>We performed density functional theory calculations for the topological insulators (TIs) of Bi<SUB>2</SUB>Se<SUB>3 </SUB> and CoSb<SUB>3</SUB> (skutterudite) in a comparison with Bi<SUB>2</SUB>Te<SUB>3</SUB> and In<SUB>2</SUB>Co<SUB>4 </SUB>Sb<SUB>12</SUB> (filled skutterudite) to explore whether the former TIs can serve as saturable-absorption materials for laser mode-locking at the wavelengths of 2 μm and beyond. The calculated electronic-band structures and optical-absorption spectra indicate the potential of these TIs in terms of midinfrared saturable-absorption applications. Especially, in consideration of the film and bulk forms of Bi<SUB>2</SUB>Se<SUB>3 </SUB> and Bi<SUB>2</SUB>Te<SUB>3</SUB>, we investigated the electronic and/or optical properties of the metallic surface states and the semiconducting interior states, respectively. They exhibited an excellent broadband operability regardless of the state, and particularly, we noted a linearly dispersive relation around the Fermi levels of all of the electrons of the Bi<SUB>2</SUB>Se<SUB>3</SUB> surface in both the conduction and valence bands, whereas this is not evident for Bi<SUB>2</SUB>Te<SUB>3</SUB>. Assuming the importance of linear dispersion for a fast electronic relaxation, and considering the decent oxidation resistance of the Bi<SUB>2</SUB>Se<SUB>3</SUB> surface, we suggest that Bi<SUB>2</SUB>Se<SUB>3</SUB> is superior to Bi<SUB>2</SUB>Te<SUB>3</SUB> for midinfrared mode-locking. A review of the experimental studies regarding TI-based 2-μm saturable absorbers that have been performed so far is presented, and the discussion and rationalization of the possible universality of TIs regarding mid- to far-infrared passive mode lockers results in the suggestion of a new CoSb<SUB>3</SUB>-TI-based saturable absorber.</P>
Pulse-amplitude equalization using a polarization-maintaining laser resonator.
Jhon, Young Min,Byun, Young Tae,Woo, Deok Ha Optical Society of America 2006 Optics letters Vol.31 No.18
<P>For the first time to our knowledge, pulse-amplitude equalization of rational-harmonically mode-locked fiber ring laser pulses has been experimentally demonstrated using a polarization-maintaining laser resonator without any additional device. The pulse-amplitude distribution of the laser pulses was controlled by the modulator driving power, and stable pulse-amplitude-equalized pulses with repetition rates of 20, 30, and 40 GHz have been obtained in the linear region of the modulator.</P>
Jhon, Young-Min,Kim, Bong-Kyu,Kim, Dong-Hwan,Kim, Myong-Wook,Kim, Sang-Kuk,Choi, Sang-Sam Optical Society of Korea 2000 Current Optics and Photonics Vol.4 No.1
We experimentally measured the cold cavity loss of a mode-locked erbium-doped fiber ring laser in situ by using the relaxation oscillation frequency method. The relaxation oscillation frequency is measured for various pumping powers and the data is fitted by the least squares method with a theoretical curve of parameters including the cavity loss. We obtained a cavity loss of 15.3$\pm$0.5 dB which was found to agree with the results of direct transmission loss measurements.
JHON, DEOK-YOUNG,LEE, SUN-HO 한국미생물 · 생명공학회 2003 Journal of microbiology and biotechnology Vol.13 No.6
The complete 1,486 nucleotide sequence of a cryptic plasmid separated from Lactobacillus bifermentans strain A02 isolated from Kimchi has been determined. The plasmid, designated as pA021, encodes a 33,488 Da putative Rep protein. Based on the sequence similarity, the protein shows homology with coding protein of pRS I , a previously reported plasmid of 0enncoccus oeni and the replication initiation protein (Rep) of the Staphylococcal pT181 plasmid family.
Design of all-optical read-only memory
Jung, Young Jin,Park, Namkyoo,Jhon, Young Min,Lee, Seok The Optical Society 2009 Applied Optics Vol.48 No.31
<P>A semiconductor optical amplifier-based all-optical read-only memory (ROM) is successfully demonstrated through simulations using a one-level simplification method optimized for optical logic circuits. Design details are presented, and advantages are discussed in comparison with an all-optical ROM-employing decoder. We demonstrate that eight characters can be stored at each address in the American Standard Code for Information Interchange.</P>