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Guoqiang Xie,Liejia Qian,Heyuan Zhu,Hua Yang 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.4
We demonstrate a diode-pumped femtosecond Nd:glass laser with an enhanced repetition rate for the first time. A coupled cavity is employed to initiate the generation of multiple pulses with equal temporal intervals inside the main cavity. Stable pulse trains with a doubled repetition rate have been obtained successfully. Extension of the approach to a higher repetition rate is quite feasible, and a tripled repetition rate, i.e., 300 MHz, has been observed experimentally.
Picosecond-Pulse-Pumped Efficient Optical Parametric Amplifier for Non-Chirped Femtosecond Pulses
Liejia Qian,Hang Luo,Heyuan Zhu,Hua Yang,Peng Yuan 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.III
A novel ultra-broadband optical parametric amplifier (OPA), which directly amplifies non-chirped femtosecond signal pulses by using picosecond pumping pulses at a wavelength corresponding to the second-harmonic of the signal, is proposed and studied numerically. The OPA is capable of supporting amplification of few-cycle femtosecond pulses and can be highly efficient due to the sweep of the signal within the picosecond pump pulse resulting from the group-velocity mismatch.
Optical Properties of Leaky Modes of Photonic Crystal Waveguides
Hao Zhang,Liejia Qian,Dianyuan Fan,Heyuan Zhu,Xiquan Fu 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.5I
We used the scattering-matrix numerical method to calculate the reflectivity and the polarization conversion efficiency of multilayered photonic crystal waveguide (PhCW) and the surface-coupling technique to plot its leaky bands. Because of the vertical confinement of PhCW, a TE-polarized incident wave is partially transferred into a reflected wave containing a TM-polarized component, however, the conversion efficiency is weak, and such a conversion vanishes for waves incident along directions possessing reflection symmetry. By comparing the reflection spectrum with the polarization conversion efficiency curves, we found that their resonance patterns were identical and that dips in the former corresponded to peaks in the latter.
Quadratic Nonlinear Technologies for Femtosecond Lasers
Liejia Qian,Guang Xu,Hang Luo,Heyuan Zhu,Peng Yuan,Tao Wang,Xiquan Fu 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.2
Quadratic optical nonlinearity (2) can be exploited in femtosecond lasers and regarded as a significant new degree of freedom for the design of short-pulse sources. We will review our recent progress on developing nonlinear quadratic technologies for femtosecond lasers. Our nonlinear laser technology offers new properties for femtosecond lasers, including optical parametric amplifier with novel working regime, efficient second harmonic generation, and time telescope.