Affiliation:
1. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
2. Institute of Mechanical & Electrical Technology, Taizhou Vocational & Technical College, Taizhou 318000, P. R. China
Abstract
In this paper, we have studied the process of monochromatic pump light in linearly chirped Periodically Poled [Formula: see text] (PPKTP) nonlinear crystal to generate single-cycle biphotons under Quasi-Phase-Matching (QPM) conditions through a Spontaneous Parametric Down-Conversion (SPDC). A detailed analysis of the phase mismatching function reveals that in PPKTP crystals, for the proper frequency range, the phase mismatching [Formula: see text] is stable and relatively close to 0 due to the relatively stable refractive index, and therefore has a good phase matching effect. Even when the chirp rate becomes small, it is able to produce single-cycle biphotons due to the near-perfect phase matching. Of course, as the chirp rate increases, the frequency response range becomes wider, the temporal width is narrower, and the number of cycles is smaller.
Funder
General scientific research project of Zhejiang Provincial Department of Education
Taizhou Science and Technology Project
Publisher
World Scientific Pub Co Pte Ltd