Ultrafast optical science and technology
Nonlinear optical pulse propagation theory
Nonlinear optics

N. Karasawa, "Computer simulations of nonlinear propagation of an optical pulse using a finite-difference in the frequency-domain method," IEEE J. Quantun Electron. 38, 626 (2002).

N. Karasawa, H. Kakehata, K. Mishina, J. Yamamoto, and S. Kobayashi, "Phase and amplitude comparison between experiment and calculation of ultrabroadband pulses generated in a taper fiber," IEEE Photon. Technol. Lett. 17, 31 (2005).

N. Karasawa, T. Takei, and K. Yamaguchi, "The spectral broadening of a blue optical pulse and the modulation of a pulse waveform in a photonic crystal fiber by induced-phase modulation," Opt. Commun. 261, 276 (2006).

N. Karasawa, K. Tada, and H. Ohmori, "The comparison between experiment and calculation of the chirp-controlled Raman self-frequency shift in a photonic crystal fiber," IEEE Photon. Technol. Lett. 19, 1292 (2007).

K. Tada and N. Karasawa, "Broadband coherent anti-Stokes Raman scattering spectroscopy using pulse-shaper-controlled variable-wavelength soliton pulses from a photonic crystal fiber," Jpn. J. Appl. Phys. 47, 8825 (2008).

K. Tada and N. Karasawa, “Broadband coherent anti-Stokes Raman scattering spectroscopy using soliton pulse trains from a photonic crystal fiber,” Opt. Commun., 282, 3948 (2009).

N. Karasawa and K. Tada, “The generation of dispersive waves from a photonic crystal fiber by higher-order mode excitation,” Optics Express, 18, 5338 (2010).