Difference-Frequency Generation Among Ultrashort Optical Pulses in Quasi-Phase-Matching Waveguides |
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Authors: | Sun Junqiang Liu Deming Huang Dexiu |
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Institution: | (1) Department of Optoelectronic Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China |
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Abstract: | A theoretical model of ultrashort pulse difference-frequency generation (DFG) is presented and developed with quasi-phase
matching (QPM) gratings in the undepleted-pump, unamplified-signal approximation. An analytic solution to a case of ultrashort
pulse pumped DFG process, including group-velocity mismatching effects and input pulses with frequency chirp and time delay,
is obtained. The influences of group-velocity mismatching effects and input signal pulse parameters on the conversion efficiency
and output converted pulse characteristics are analyzed and discussed. The results indicate that the conversion efficiency
is increased due to the enhancement of pump and signal interaction. The output pulse is inevitable compressed under pulsed
pumping and can be compensated by introducing the initial frequency chirp and time delay. |
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Keywords: | all-optical signal process difference-frequency generation nonlinear optics optical waveguide |
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