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Current Research
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Related publications
Relevant Publications (totally over 60 publications) Peer Reviewed Journal Papers 1) Chengquan Li, Hiroki, Mashiko, He Wang, et al. “Carrier-envelope phase stabilization by controlling compressor grating separation,” Applied Physics Letters, accepted. 2) Chengquan Li, Eric Moon, He Wang, et al. "Determining the Phase-Energy Coupling Coefficient in Carrier-envelope Phase Measurements,” Optics Letters 32, 796 (2007). 3) Chengquan Li, Eric Moon, Hiroki Mashiko, et al. "Precision control of carrier-envelope phase in grating based chirped pulse amplifiers," Optics Express 14, 11468(2006) 4) Chengquan Li, Eric Moon, and Zenghu Chang, “Carrier-envelope phase shift caused by variation of grating separation," Optics Letters. 31,3113 (2006)
Peer Reviewed Conference Articles 1) Chengquan Li, Hiroki Mashiko, Eric Moon, et al. “Stabilizing carrier-envelope phase by controlling grating separation of compressor,” CThU2, Conference on Lasers and Electro-optics, (CLEO 2008), May 4-9, 2008, San Jose, CA. 2) Chengquan Li, Eric Moon, He Wang, et al. “Determining phase-energy coupling coefficient in carrier-envelope Phase Measurements,” CThHH1, Conference on Lasers and Electro-optics, (CLEO 2007), May 6-11, 2007, Baltimore, MD. 3) Chengquan Li, Eric Moon, Zenghu Chang; “Controlling carrier-envelope phase of grating-based chirped pulse amplifiers,” CThX4, Conference on Lasers and Electro-optics, (CLEO 2007), May 6-11, 2007, Baltimore, MD. Patents
1. Stabilization on carrier-envelope phase of KLS laser system The carrier-envelope (CE) phase, a very important parameter in few-cycle laser pulses, gives the electric field distribution inside the pulse envelope. Thus, the CE phase affects the outcome of many intense laser-matter interaction processes, such as single attosecond pulse and high harmonic generation (HHG), above threshold ionization (ATI) , non-sequential double ionization (NSDI) and electron emission from metal surfaces. The CE phase of amplified laser pulses has been stabilized for tens of minutes through stabilization of the carrier-envelope offset frequency of the oscillator providing the seed pulses and by subsequent correction of the slow drift occurring during chirped pulse amplification. For many experiments that involve the coincident measurement of electrons and ions, the signal count rate could be so low that several hours of signal accumulation is necessary even when kilohertz lasers are used. In KLS, I am working on the CE phase locking with co-workers. We stabilized CE phases both in oscillator and chirped pulse amplifier: (1). Locking the CE phase in oscillator. To lock the CE phase in oscillator, we use f-to-2f interferometer to lock the CE phase offset frequency at 1/4 frep (repetition frequency of oscillator). In our case, a He-Ne laser is used to control the two arms drift f-to-2f interferometer.
(2). Stabilization on CE phase drift in amplified laser pulse from CPA.
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