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    Sequentially timed all-optical mapping photography (STAMP) utilizing spectral filtering.
    Opt Express 2015 Nov;23(23):30512-22
    We propose and experimentally demonstrate a new method called SF-STAMP for sequentially timed all-optical mapping photography (STAMP) that utilizes spectral filtering. SF-STAMP is composed of a diffractive optical element (DOE), a band-pass filter, and two Fourier transform lenses. Using a linearly frequency-chirped pulse and converting the wavelength to the time axis, we realize single-shot ultrafast burst imaging. As an experimental demonstration of SF-STAMP, we monitor the dynamics of a laser ablation using a linearly frequency-chirped broadband pulse (>100 nm) that is temporally stretched up to ~40 ps. This imaging method is expected to be effective for investigating ultrafast dynamics in a diverse range of fields, such as photochemistry, plasma physics, and fluidics.

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    Design for sequentially timed all-optical mapping photography with optimum temporal performance.
    Opt Lett 2015 Feb;40(4):633-6
    A recently developed ultrafast burst imaging method known as sequentially timed all-optical mapping photography (STAMP) [Nat. Photonics8, 695 (2014)10.1038/nphoton. Read More
    Dual chirped optical pulses from a phase-modulated laser.
    Opt Express 2007 Dec;15(25):16357-66
    Dual chirped optical pulse is reported by use of a phase-modulated laser. When a number of sidebands around the carrier frequency in a phase-modulated laser spectrum are spectrally carved, short optical pulse trains with dual chirp states are obtained. It is discussed that the pulse duration and the linear frequency chirp parameter can be found in closed form expressions given as a function of the modulation index and the modulation frequency when the phase modulation function of the dual-chirped pulse trains does not deviate severely from the modulation function applied to the phase modulator by spectral filtering effects. Read More
    Ultra-broadband fiber optical parametric amplifier pumped by chirped pulses.
    Opt Lett 2014 Jul;39(13):3782-5
    We numerically and experimentally demonstrate ultra-broadband fiber optical parametric amplification in a microstructured fiber pumped by stretched short pulses. The chirped pump pulse induces a temporally spread spectral gain suitable for optical parametric chirped pulse amplification in fibers. Numerical simulation shows ~45  dB flat gain with more than 70 nm bandwidth, allowing sub-35 fs pulse amplification around 1 μm with reduced gain narrowing. Read More
    Sub-5-ps optical pulse generation from a 1.55-µm distributed-feedback laser diode with nanosecond electric pulse excitation and spectral filtering.
    Opt Express 2012 Oct;20(22):24843-9
    Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.
    This paper reports generation of sub-5-ps Fourier-transform limited optical pulses from a 1.55-µm gain-switched single-mode distributed-feedback laser diode via nanosecond electric excitation and a simple spectral-filtering technique. Typical damped oscillations of the whole lasing spectrum were observed in the time-resolved waveform. Read More