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Browsing by Author "Chan, Han-Sung"

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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
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    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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    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.
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    Synthesis of Attosecond Waveforms Using Raman-generated Frequency Combs
    (2010)
    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
    Attosecond optical waveforms of arbitrary shape are synthesized and verified using a Raman-generated comb of frequencies that have a controlled and stable carrier-envelope phase. (C)2010 Optical Society of America