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Browsing by Author "Lai, Chien-Jen"

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    Carrier-Envelope-Phase Control of Ultrashort Periodic Pulses Synthesized from Raman Generated Combs
    (2009-01-01)
    Hsieh, Zhi-Ming
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    Lai, Chien-Jen
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    Chan, Han-Sung
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    Wu, Sih-Ying
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    Lee, Chao-Kuei
    The carrier-envelope phase of Raman generated ultrashort pulses is controlled by driving the Raman coherence with a beam at near the raman resonance frequency and its second harmonic.
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    Controlling the Carrier-Envelope Phase of Raman-Generated Periodic Waveforms
    (2009-05-29)
    Hsieh, Zhi-Ming
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    Lai, Chien-Jen
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    Chan, Han-Sung
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    Wu, Sih-Ying
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    Lee, Chao-Kuei
    We demonstrate control of the carrier-envelope phase of ultrashort periodic waveforms that are synthesized from a Raman-generated optical frequency comb. We generated the comb by adiabatically driving a molecular vibrational coherence with a beam at a fundamental frequency plus its second harmonic. Heterodyne measurements show that full interpulse phase locking of the comb components is realized. The results set the stage for the synthesis of periodic arbitrary waveforms in the femtosecond and subfemtosecond regimes with full control.
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    Full Control of the Carrier-Envelope Phase of Raman-Generated Single-Cycle Waveforms
    (2009-01-01)
    Hsieh, Zhi-Ming
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    Lai, Chien-Jen
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    Chan, Han-Sung
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    Wu, Sih-Ying
    ;
    Lee, Chao-Kuei
    Precise control of the carrier-envelope phase of Raman genearated ultrashort pulses is achieved by generating a Raman frequency comb using an infrared laser pulse and its second harmonic to drive the Raman coherence. (C) 2009 Optical Society of America
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    Generation of multi-octave-spanning laser harmonics by cascaded quasi-phase matching in a monolithic ferroelectric crystal
    (2009-11-15)
    Hsu, Wei-Chun
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    Lai, Ying-Yao
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    Lai, Chien-Jen
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    Peng, Lung-Han
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    Pan, Ci-Ling
    We report the generation of the second to the sixth harmonics of a fundamental frequency covering two and a half octaves in a multiply-periodically poled lithium tantalate crystal by cascaded quasi-phase-matched frequency mixing. A frequency comb that is composed of these harmonics will permit the synthesis of a train of periodic subcycle subfemtosecond pulses in a compact setting. (C) 2009 Optical Society of America
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    Generation of Octave-Spanning Multiple Harmonics for Ultrafast Waveform Synthesis
    (2009)
    Hsu, Wei-Chun
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    Hsieh, Zhi-Ming
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    Lai, Ying-Yao
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    Lai, Chien-Jen
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    Chen, Wei-Ting
    Up to seven laser harmonics covering more than two octaves in frequency have been generated efficiently in a single PPLT crystal. permitting the syntehsis of 1.5 femtosecond pulses in a stable and compact setting
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    Optical Interference in Nonlinear Photonic Crystals
    (2008)
    Lai, Chien-Jen
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    Peng, Lung-Han
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    Kung, A. H.
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    光電工程學系
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    Department of Photonics
    We report a generalized quantitative analysis of the origin of optical interference in two-dimensional nonlinear photonic crystals. The results are verified by a second harmonic generation experiment in a 2-D periodically-poled LiNbO3 crystal. (c) 2008 Optical Society of America
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    Optical interference in nonlinear photonic crystals
    (2007-11-01)
    Lai, Chien-Jen
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    Peng, L. -H.
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    Kung, A. H.
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    光電工程學系
    ;
    Department of Photonics
    A model to analyze the interaction of the parametric fields being generated in a two-dimensional nonlinear photonic crystal has been developed. The analysis provides details of the interference of the generated wave(s) both inside and in the region just outside the crystal. The results are verified by second-harmonic generation in a LiNbO3 crystal that has been poled with a tetragonal inverted domain structure. (c) 2007 Optical Society of America.
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    Pulse Shaper Assisted Characterization of Single-cycle Optical Pulses
    (2009)
    Hsieh, Zhi-Ming
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    Lai, Chien-Jen
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    Liang, Wei-Hong
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    Tang, Tsung-Ta
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    Chen, Wei-Jan
    Shaper-assisted autocorrelation is developed to characterize single-cycle pulses. The correlation signal show significantly improved signal-to-noise ratio and thus accuracy in pulse characterization when compared to cross-correlation obtained by splitting the spectral components of the pulse. (C) 2009 Optical Society of America
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    Sub-single-cycle optical pulse train with constant carrier envelope phase
    (2008-04-25)
    Chen, Wei-Jan
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    Hsieh, Zhi-Ming
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    Huang, ShuWei
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    Su, Hao-Yu
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    Lai, Chien-Jen
    We describe the synthesis of periodic waveforms consisting of a train of pulses that are 0.83 cycles long and have an electric field pulse width of 0.44 fs using 7 Raman sidebands generated by molecular modulation in H(2). We verify by optical correlation that the carrier-envelope phase is constant in these waveforms when they are synthesized from commensurate sidebands. The estimated overall shift of the carrier-envelope phase is less than 0.18 cycles from the first to the last pulse of nearly 10(6) pulses in the pulse train.
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    Synthesis and Measurement of Ultrafast Waveforms from Five Discrete Optical Harmonics
    (2011-03-04)
    Chan, Han-Sung
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    Hsieh, Zhi-Ming
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    Liang, Wei-Hong
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    Kung, A. H.
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    Lee, Chao-Kuei
    Achieving the control of light fields in a manner similar in sophistication to the control of electromagnetic fields in the microwave and radiofrequency regimes has been a major challenge in optical physics research. We manipulated the phase and amplitude of five discrete harmonics spanning the blue to mid-infrared frequencies to produce instantaneous optical fields in the shape of square, sawtooth, and subcycle sine and cosine pulses at a repetition rate of 125 terahertz. Furthermore, we developed an all-optical shaper-assisted linear cross-correlation technique to retrieve these fields and thereby verified their shapes and confirmed the critical role of carrier-envelope phase in Fourier synthesis of optical waveforms.