Ajou University, Department of Physics & Division of Energy Systems Research
Ph.D. : AJou University, Applied physics, 2015 M. S. : AJou University, Applied physics, 2010
B. S. : Ajou University, Physics, 2008
Research area : CNT & graphene saturable absorbers, ultrafast compact lasers
E-mail : psyturtle[at]kaist.ac.kr
Publications
Journals - J. W. Kim, S. Y. Choi, W. T. Kim, B. J. Kang, W. B. Cho, G.-H. Kim, F. Rotermund, "550-MHz carbon nanotube mode-locked femtosecond Cr:YAG laser," Chin. Opt. Lett. 16, 061404 (2018). (journal cover)
- S. Y. Choi, T. Calmano, F. Rotermund, C. Kränkel, "2-GHz carbon nanotube mode-locked Yb:YAG channel waveguide laser," Opt. Express 26, 5140 (2018).
- E. Kifle, X. Mateos, P. Loiko, S.Y. Choi, J. E. Bae, F. Rotermund, M. Aguilo, F. Diaz, U. Griebner, V. Petrov, “Tm:KY1-x-yGdxLuy(WO4)2 planar waveguide laser passively Q-switched by single-walled carbon nanotubes,”Opt. Express 26, 4961 (2018).
- K. J. Ahn, J. Y. Gwak, B. J. Lee, S. Y. Choi, M. H. Kim, I. H. Baek, Y. U. Jeong, and F. Rotermund, “Wavelength and fluence dependent third-order optical nonlinearity of mono-and multi-layer graphene,” Appl. Opt. 56, 9920 (2017).
- C. Kim, D. Kwon, D. Kim, S. Y. Choi, S. J. Cha, K. S. Choi, D.-I. Yeom, F. Rotermund, and J. Kim, “Robust, low-noise, polarization-maintaining mode-locked Er-fiber laser with a planar lightwave circuit (PLC) device as a multi-functional element,” Opt. Lett. 42, 1472 (2017).
- P. Loiko, J. M. Serres, X. Mateos, M. Aguiló, F. Díaz, L. Zhang, Z. Lin, H. Lin, G. Zhang, K. Yumashev, V. Petrov, U. Griebner, Y. Wang, S. Y. Choi, F. Rotermund, and W. Chen, “Monoclinic Tm3+:MgWO4: al promising crystal for continuous-wave and passively Q-switched lasers at ~ 2 µm,” Opt. Lett. 42, 1177 (2017).
- I. H. Baek, J. M. Hamm, K. J. Ahn, B. J. Kang, S. S. Oh, S. Bae, S. Y. Choi, B. H. Hong, D.-I. Yeom, B. Min, O. Hess, Y. U. Jeong, and F. Rotermund, “Boosting the terahertz nonlinearity of graphene by orientation disorder,” 2D Mater. 4, 025035 (2017).
- E. Kifle, X. Mateos, J. R. Vazquez De Aldana, A. Rodenas, P. Loiko, S. Y. Choi, F. Rotermund, U. Griebner, V. Petrov, M. Aguilo, F. Diaz, “Femtosecond-laser-written Tm:KLu(WO4)2 waveguide lasers,” Opt. Lett. 42, 1177 (2017).
- K. N. Gorbachenya, V. E. Kisel, A. S. Yasukevich, M. B. Prudnikova, V. V. Maltsev, N. I. Leonyuk, S. Y. Choi, F. Rotermund, N. V. Kuleshov, “Passively Q-switched Er,Yb:GdAl3(BO3)4 laser with single-walled carbon nanotube based saturable absorber,” Laser Phys. Lett. 14, 035802 (2017).
- J. Ko, H. Jeong, S. Y. Choi, F. Rotermund, D.-I. Yeom, B. Y. Kim, “Single-walled carbon nanotubes on side polished fiber as a universal saturable absorber for various laser output states,” Cur. Appl. Phys. 17, 37 (2017).
- P. Loiko, X. Mateos, S. Y. Choi, F. Rotermund, J. M. Serres, M. Aguilo, F. Diaz, K. Yumashev, U. Griebner, V. Petrov, “Vibronic thulium laser at 2131 nm Q-switched by single-walled carbon nanotubes,” J. Opt. Soc. Am. B 33, D19 (2016).
- J. Gene, N. H. Park, H. S. Jeong, S. Y. Choi, F. Rotermund, D.-I. Yeom, B. Y. Kim, “Optically controlled in-line graphene saturable absorber for the manipulation of pulsed fiber laser operation,” Opt. Express 24, 12301 (2016).
- W. B. Cho, S. Y. Choi, C. Zhu, M. H. Kim, J. W. Kim, J. S. Kim, H. J. Park, D. H. Shin, M. Y. Jung, F. Wang, F. Rotermund, “Graphene mode-locked femtosecond Cr2+:ZnS laser with ~300 nm tuning range,” Opt. Express 24, 20774 (2016).
- H. Jeong, S. Y. Choi, F. Rotermund, K. Lee, and D.-I. Yeom, “All-Polarization Maintaining Passively Mode-Locked Fiber Laser Using Evanescent Field Interaction With Single-Walled Carbon Nanotube Saturable Absorber,” J. Lightwave Technol. 34, 3510 (2016).
- M. H. Kim, T. Calmano, S. Y. Choi, B. J. Lee, I. H. Baek, K. J. Ahn, D.-I. Yeom, C. Kränkel, F. Rotermund, “Monolayer graphene coated Yb:YAG channel waveguides for Q-switched laser operation,” Opt. Mater. Express 6, 2468 (2016).
- H. Jeong, S. Y. Choi, M. H. Kim, F. Rotermund, Y.-H. Cha, D.-Y. Jeong, S. B. Lee, K. Lee, and D.-I. Yeom, "All-fiber Tm-doped soliton laser oscillator with 6 nJ pulse energy based on evanescent field interaction with monolayer graphene saturable absorber," Opt. Express 24, 14153 (2016).
- R. Lan, P. Loiko, X. Mateos, Y. Wang, J. Li, Y. Pan, S. Y. Choi, M. H. Kim, F. Rotermund, A. Yasukevich, K. Yumashev, U. Griebner, and V. Petrov, "Passive Q-switching of microchip lasers based on Ho:YAG ceramics," Appl. Opt. 55, 4877 (2016).
- C. Kim, D. Kim, Y.J. Cheong, D. Kwon, S. Y. Choi, H. Jeong, S. J. Cha, J.-W. Lee, D.-I. Yeom, F. Rotermund, and J. Kim, "300-MHz-repetition-rate, all-fiber, femtosecond laser mode-locked by planar lightwave circuit-based saturable absorber," Opt. Express 23, 26234 (2015).
- N. H. Park, H. Jeong, S. Y. Choi, M. H. Kim, F. Rotermund, and D.-I. Yeom, "Monolayer graphene saturable absorbers with strongly enhanced evanescent-field interaction for ultrafast fiber laser mode-locking," Opt. Express 23, 19806 (2015).
- E. J. Lee+, S. Y. Choi+, H. Jeong+, N. H. Park, W. Yim, M. H. Kim, J.-K. Park, S. Son, S. Bae, S. J. Kim, Y. H. Ahn, K. J. Ahn, B. H. Hong, J.-Y. Park, F. Rotermund*, D.-I. Yeom*, "Active control of all-fibre graphene devices with electrical gating," Nature Commun. 6, 6851 (2015).
- S. Y. Choi, T. Calmano, M. H. Kim, D.-I. Yeom, C. Kränkel, G. Huber, F. Rotermund, "Q-switched operation of a femtosecond-laser-inscribed Yb:YAG channel waveguide laser using carbon nanotubes," Opt. Express 23, 7999 (2015).
- J. W. Kim, S. Y. Choi, S. Aravazhi, M. Pollnau, U. Griebner, V. Petrov, S. Bae, K. J. Ahn, D.-I. Yeom, F. Rotermund, "Graphene Q-switched Yb:KYW planar waveguide laser," AIP Adv. 5, 017110 (2015).
- V. Aleksandrov, A. Gluth, V. Petrov, I. Buchvarov, S. Y. Choi, M. H. Kim, F. Rotermund, X. Mateos, F. Diaz, and U. Griebner, "Tm,Ho:KLu(WO4)2 laser mode-locked near 2 μm by single-walled carbon nanotubes," Opt. Express 22, 26872 (2014).
- H. Jeong, S. Y. Choi, F. Rotermund, Y.-H. Cha, D.-Y. Jeong, D.-I. Yeom "All-fiber mode-locked laser oscillator with pulse energy of 34 nJ using a carbon nanotube saturable absorber," Opt. Express 22, 22667 (2014).
- S. Y. Choi, J. W. Kim, M. H. Kim, D.-I. Yeom, B. H. Hong, X. Mateos, M. Aguilo, F. Diaz, V. Petrov, U. Griebner, F. Rotermund, "Carbon nanostructure-based saturable absorber mirror for a diode-pumped 500-MHz femtosecond Yb:KLu(WO4)2 laser," Opt. Express 22, 15626 (2014).
- Y. Zhang, V. Petrov, U. Griebner, X. Zhang, S. Y. Choi, J. Y. Gwak, F. Rotermund, X. Mateos, H. Yu, H. Zhang, J. Liu, "90-fs diode-pumped Yb:CLNGG laser mode-locked using single-walled carbon nanotube saturable absorber," Opt. Express 22, 5635 (2014).
- H. Yang, H. Kim, J. Shin, C. Kim, S. Y. Choi, G. H. Kim, F. Rotermund, J. Kim, “Gigahertz repetition rate, sub-femtosecond timing jitter optical pulse train directly generated from a mode-locked Yb:KYW laser,” Opt. Lett. 39, 56 (2014).
- S. Y. Choi, H. Jeong, B. H. Hong, F. Rotermund, D.-I. Yeom, “All-fiber dissipative soliton laser with 10.2 nJ pulse energy using an evanescent field interaction with graphene saturable absorber," Laser Phys. Lett. 11, 015101 (2014).
- J. W. Kim, S. Y. Choi, D.-I. Yeom, S. Aravazhi, M. Pollnau, U. Gruebner, V. Petrov, F. Rotermund, "Yb:KYW planar waveguide laser Q-switched by evanescent-field interaction with carbon nanotubes," Opt. Lett. 38, 5090 (2013).
- H. Jeong, S. Y. Choi, F. Rotermund, D.-I. Yeom, "Pulse width shaping of passively mode-locked fiber laser via polarization control in carbon nanotube saturable absorber,” Opt. Express 21, 27011 (2013).
- S. D. D. D. Cafiso, E. Ugolotti, A. Schmidt, V. Petrov, U. Griebner, A. Agnesi, W. B. Cho, Y. G. Zhang, S. Y. Choi, F. Rotermund, G. Reali, F. Pirzio, "Sub-50-fs mode-locking of the Cr:YAG laser using SWCNT-SA," Laser Phys. Lett. 10, 085801 (2013).
- K. Seger, N. Meiser, S. Y. Choi, B. H. Jung, D.-I. Yeom, F. Rotermund, O. Okhotnikov, F. Laurell, V. Pasiskevicius, "Carbon nanotube mode-locked optically-pumped semiconductor disk laser," Opt. Express 21, 17806 (2013).
- H. Jeong, S. Y. Choi, E. I. Jeong, S. J. Cha, F. Rotermund, D.-I. Yeom, "Ultrafast mode-locked soliton fiber laser using a waveguide-type saturable absorber based on single-walled carbon nanotubes," Appl. Phys. Express 6, 052705 (2013).
- J. W. Kim, S. Y. Choi, B. H. Jung, D.-I. Yeom, F. Rotermund, "Applicability of graphene flakes as saturable absorber for bulk laser mode-locking," Appl. Phys. Express 6, 032704 (2013).
- H.-W. Yang, C. Kim, S. Y. Choi, G.-H. Kim, Y. Kobayashi, F. Rotermund, J. Kim, "1.2-GHz repetition rate, diode-pumped femtosecond Yb:KYW laser mode-locked by a carbon nanotube saturable absorber mirror," Opt. Express 20, 29518 (2012).
- A. Schmidt, S. Y. Choi, D. -I. Yeom, F. Rotermund, X. Mateos, M. Segura, F. Diaz, V. Petrov, and U. Griebner, "Femtosecond pulses near 2 μm from a Tm:KLuW laser mode-locked by a single-walled carbon nanotube saturble absorber," Appl. Phys. Express, 5, 092704 (2012).
- F. Rotermund, W. B. Cho, S. Y. Choi, I. H. Baek, J. H. Yim, S. Lee, A. Schmidt, G. Steinmeyer, U. Griebner, D.-I. Yeom, K. Kim, V. Petrov, "Mode-locking of solid-state lasers by single-walled carbon-nanotube based saturable absorbers," Quantum Electron. 42, 663 (2012).
- I. Baylam, S. Ozharar, H. Cankaya, S. Y. Choi, K. Kim, F. Rotermund, U. Griebner, V. Petrov, and A. Sennaroglu, "Energy scaling of a carbon nanotube saturable absorber mode-locked femtosecond bulk laser," Opt. Lett. 37, 3555 (2012).
- C. S. Jun, S. Y. Choi, F. Rotermund, B. Y. Kim, and D. -I. Yeom, "Toward higher-order passive harmonic mode-locking of a soliton fiber laser," Opt. Lett. 37, 1862 (2012).
- S. Y. Choi, D. K. Cho, Y.-W. Song, K. Oh, K. Kim, F. Rotermund, D.-I. Yeom, "Graphene-filled hollow optical fiber saturable absorber for soliton fiber laser mode-locking," Opt. Express 20, 5652 (2012).
- A. Schmidt, P. Koopmann, G. Huber, P. Fuhrberg, S. Y. Choi, D.-I. Yeom, F. Rotermund, V. Petrov, U. Griebner, "175 fs Tm:Lu2O3 laser at 2.07 μm mode-locked using single-walled carbon nanotubes," Opt. Express 20,5313 (2012).
- A. Agnesi, A. Greborio, F. Pirzio, G. Reali, E. Ugolotti, S. Y. Choi, F. Rotermund, U. Griebner, V. Petrov, "Femtosecond Nd:glass lasers pumped by single-mode laser diodes and mode-locked with carbon nanotube or semiconductor saturable absorber mirrors," IEEE J. Select. Top. Quant. Electron. 18, 74(2012).
- H. Iliev, I. Buchvarov, S. Y. Choi, K. Kim, F. Rotermund, U. Griebner, V. Petrov, "Steady state mode-locking of a 1.34 μm Nd:YVO4 laser with a single-walled carbon nanotube saturable absorber," Appl. Phys. B 206, 1 (2012).
- A. Agnesi, F. Pirzio, E. Ugolotti, S. Y. Choi, D.-I. Yeom, F. Rotermund, "Femtosecond single-mode diode-pumped Cr:LiSAF laser mode-locked with single-walled carbon nanotubes," Opt. Commun. 285, 742 (2012).
- W. B, Cho, J. W. Kim, H. W. Lee, S. Bae, B. H. Hong, S. Y. Choi, I. H. Baek, K. Kim, D.-I. Yeom, F. Rotermund, "High-quality, large-area monolayer graphene for bulk laser mode-locking near 1.25 μm", Opt. Lett. 36, 4089 (2011).
- C. S. Jun, J. H. Im, S. H. Yoo, S. Y. Choi, F. Rotermund, D.-I. Yeom, B. Y. Kim, "Low noise GHz passive harmonic mode-locking of soliton fiber laser using evanescent wave interaction with carbon nanotubes," Opt. Express 19, 19775 (2011).
- I. H. Baek, S. Y. Choi, H. W. Lee, W. B, Cho, V. Petrov, A. Agnesi, V. Pasiskevicius, D.-I. Yeom, K. Kim, F. Rotermund, "Single-walled carbon nanotube saturable absorber assisted high-power mode-locking of a Ti:sapphire laser", Opt. Express 19, 7833 (2011).
- W. B, Cho, S. Y. Choi, J. W. Kim, D.-I. Yeom, K. Kim, H. Lim, F. Rotermund, "Solid-state laser mode-locking near 1.25 μm employing a carbon nanotube saturable absorber mirror", J. Opt. Soc. Kor. 15, 56 (2011).
- A. Agnesi, L. Carra, F. Pirzio, G. Reali, A. Toncelli, M. Tonelli, S. Y. Choi, F. Rotermund, U. Griebner, V. Petrov, "Diode-pumped Nd:BaY2F8 picosecond laser mode-locked with carbon nanotube saturable absorbers," J. Opt. Soc. Am. B 27, 2739 (2010).
- A. Agnesi, A. Greborio, F. Pirzio, G. Reali, S. Y. Choi, F. Rotermund, U. Griebner, V. Petrov, "99-fs Nd:glass laser mode-locked with carbon nanotube saturable absorber mirror," Appl. Phys. Express 3, 112702 (2010).
- J. H. Im, S. Y. Choi, F. Rotermund, D.-I. Yeom, "All-fiber Er-doped dissipative soliton laser based on evanescent field interaction with carbon nanotube saturable absorber," Opt. Express 18, 22141 (2010).
- W. B. Cho, A. Schmidt, S. Y. Choi, V. Petrov, U. Griebner, G. Steinmeyer, S. Lee, D.-I. Yeom, F. Rotermund, "Mode-locking of a Cr:YAG laser with carbon nanotubes," Opt. Lett. 35, 2669 (2010).
- W. B, Cho, J. H. Yim, S. Y. Choi, S. Lee, A. Schmidt, G. Steinmeyer, U. Griebner, V. Petrov, D.-I. Yeom, K. Kim, F. Rotermund, "Boosting the nonlinear optical response of carbon nanotube saturable absorbers for broadband mode-locking of bulk lasers", Adv. Funct. Mater. 20, 1937 (2010).
- S. H. Bae, I. H. Baek, S. Y. Choi, W. B. Cho, F. Rotermund, C. S. Yoon, "Efficient second-harmonic generation of ultrashort pulses with simultaneous quasi-phase matching and group velocity matching in periodic 90° domain structures of potassium niobate," Opt. Commun. 283, 1894 (2010).
- S. Y. Choi, F. Rotermund, H. Jung, K. Oh, D.-I. Yeom, "Femtosecond mode-locked fiber laser employing a hollow optical fiber filled with carbon nanotube dispersion as saturable absorber," Opt. Express 17, 21788 (2009).
- A. Schmidt, S. Rivier, W. B. Cho, J. H. Yim, S. Y. Choi, S. Lee, F. Rotermund, D. Rytz, G. Steinmeyer, V. Petrov, U. Griebner, "Sub-100fs single-walled carbon nanotube saturable absorber mode-locked Yb-laser operation near 1 μm," Opt. Express 17, 20109 (2009).
- W. B. Cho, A. Schmidt, J. H. Yim, S. Y. Choi, S. Lee, F. Rotermund, U. Griebner, G. Steinmeyer, V. Petrov, X. Mateos, M. C. Pujol, J. J. Carvajal, M. Aguilo, F. Diaz, "Passive mode-locking of a Tm-doped bulk laser near 2 μm using a carbon nanotube saturable absorber," Opt. Express 17, 11007 (2009).
- W. B. Cho, J. H. Yim, S. Y. Choi, S. Lee, U. Griebner, V. Petrov, F. Rotermund, "Mode-locked self-starting Cr:forsterite laser using a single-walled carbon nanotube saturable absorber," Opt. Lett. 33, 2449 (2008).
Conferences
International Conferences - S. Y. Choi, T. Calmano, F. Rotermund, C. Saraceno, and C. Kränkel, “GHz mode-locked Yb:YAG channel waveguide laser,” Advanced Solid State Lasers Conference (ASSL) 2017, Nagoya, Japan.
- S. Y. Choi, F. Rotermund, C. Kränkel, and T. Camano, “Mode-locking of a femtosecond-laser-inscribed Yb:YAG channel waveguide laser using a carbon nanotube saturable absorber,” CLEO/Europe-EQEC 2017, Munich, Germany.
- S. Y. Choi, T. Calmano, C. Kränkel, and F. Rotermund, “2 GHz repetition rate, single-walled carbon nanotube mode-locked Yb:YAG channel waveguide lasers in an extended cavity configuration,” The 6th Advanced Lasers and Photon Sources (ALPS) 2017, Yokohama, Japan.
- S. Y. Choi, K. N. Gorbachenya, V. E. Kisel, A. S. Yasukevich, V. V. Maltsev, N. I. Leonyuk, N. V. Kuleshov, and F. Rotermund, “Carbon nanotube saturable absorber for passive Q-switching of Er,Yb-doped bulk laser,” The 10th Asia-Pacific Laser Symposium 2016, Jeju, South Korea.
- S. Y. Choi, T. Calmano, M. H. Kim, D.-I. Yeom, C. Kränkel, G. Huber, and F. Rotermund, “Diode-pumped femtosecond-laser-inscribed Yb:YAG channel waveguide lasers, Q-switched by carbon nanotubes,” CLEO/Europe-EQEC 2015, Munich, Germany.
- S. Y. Choi, J. W. Kim, M. H. Kim, D.-I. Yeom, B. H. Hong, X. Mateos, M. Aguílo, F. Díaz, V. Petrov, U. Greibner, and F. Rotermund, “Diode-pumped, femtosecond Yb:KLu(WO4)2 laser mode-locked by carbon nanostructure-based saturable absorber mirror,” 3rd Advanced Lasers and Photon Sources 2014 (APLS 2014), Yokohama, Japan.
- S. Y. Choi, Y.-W. Song, K. Oh, F. Rotermund, and D.-I. Yeom, “Soliton fiber laser mode-locking using graphene-filled hollow optical fiber,” The 17th Optoelectronic and Communications Conference (OECC’12) 2012, Busan, South Korea.
- S. Y. Choi, D. K. Cho, F. Rotermund, Y.-W. Song, K. Oh, and D.-I. Yeom, “Graphene-filled hollow optical fiber for all-fiber laser mode-locking,” IQEC/CLEO Pacific Rim 2011, Sydney, Australia.
- S. Y. Choi, F. Rotermund, H. Jung, K. Oh, and D.-I. Yeom, “Passively mode-locked fiber laser incorporating single-walled carbon nanotube-filled hollow optical fiber,” CLEO Pacific Rim 2009, Shanghai, China.
- S. Y. Choi, W. B. Cho, J. H. Yim, S. Lee, Y. H. Ahn, K. Kim, H. Lim, and F. Rotermund, “Carbon nanotube saturable absorbers for solid-state laser mode-locking near 1.25 µm,” Nanotube 08 (NT08) (2008), Montpellier, France.
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