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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, 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.
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.
Taxonomic study the Genus Cydia Hübner (Lepidoptera, Tortricidae, Olethreutinae) in Korea
Do-Young Chae,Yang-Seop Bae,Jhon B. Heppner 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.05
The tortricid moths genus Cydia Hübner includes many species of economic importance due to the damage they inflict on agricultural crops, especially fruit and nut trees. Some Cydia species are an important food source for other animals, and some have been used as agents of biological control. Cydia species are generally small dull brown moths with yellow or white wormlike larvae. This group was defined by the combination of the following characters: Apical segment porrect; forewing apex rounded; M2 and M3 sub-parallel; hindwing M3 separate CuA1; uncus absent; socius rounded; corpus bursae with two segnum, like hook-shape; ductus bursae sclerotized. In this study, the Korean species of genus Cydia are reviewed. A total of 10 species are recognized. Among them, two species are newly recorded from Korea for the first time. Adults and genitalia of both sexes are illustrated. Distribution map, data matrix, cladistic analysis are provided. Also illustration of adults, venations, male and female genitalia are provided.