1) Single-shot imaging spectroscopy
Femtosecond single-shot pump-probe imaging spectroscopy is a promising technique for revealing irreversible photochemical reactions such as photoinduced phase transition, photodissociation, photopolymerization and so on. Using an echelon mirror with a micro-step structure, we have developed a new scheme for single-shot pump-probe imaging spectroscopy. Using this new technique with SHG or optical Kerr gate apparatus, we could successfully map the time-frequency images of ultrashort laser pulses. By simply replacing a nonlinear crystal or Kerr medium with samples, we could also visualize the nonlinear responses of materials such as phonon-polariton propagation in ferroelectric LiNbO3.
- H. Sakaibara, Y. Ikegaya, I. Katayama and J. Takeda, "Single-Shot Time-Frequency Imaging Spectroscopy Using an Echelon Mirror", Opt. Lett., accepted (2012).
- I. Katayama, H. Sakaibara, and J. Takeda, "Real-Time Time–Frequency Imaging of Ultrashort Laser Pulses Using an Echelon Mirror", Jpn. J. Appl. Phys., 50, 102701 (2011). *Selected for 'spotlights' (http://jjap.jsap.jp/spotlights/index.html).
- J. Takeda, A. Ishida, Y. Makishima, and I. Katayama, ''Real-Time Time-Frequency Two-Dimensional Imaging of Ultrafast Transient Signals in Solid-State Organic Materials'', Sensors, 10, 4253 (2010).
- N. Furukawa, C. E. Mair, V. D. Kleiman and J. Takeda, "Femtosecond Real-Time Pump-Probe Imaging Spectroscopy", Appl. Phys. Lett., 85, 4645 (2004).