Proceedings of The 3rd International Conference on Research in Science, Engineering and Technology
Binary Sequences with Large SRS Contrast Ratios
Tingyao Xiong, Jonatha I. Hall
Stimulated Raman Scattering (SRS) is a very useful tool to extend the frequency range of fixed-frequency and tunable lasers. In particular, In the use of laser pulses to control chemical reactions, a successful management technique called pseudorandom binary phase shaping (BPS) have been used to achieve much cleaner coherent excitation of a Raman mode at certain frequency. A core technical problem in BPS is to find pseudorandom binary sequences with large SRS contrast ratios. In the past, with aid of more and more powerful computers, the main search methods for such ‘ideal’ sequences were conducting exhaustive search within a certain scope narrowed by experiences and some mathematical knowledge such as number theory. In this paper, in the light from the known results in Merit Factor Problem, we have given several families of various lengths that have large asymptotic SRS contrast ratios. Our results have shown that Jacobi family Sequences, are still the best candidates to obtain binary sequences with large SRS contrast ratios. Our numerical analysis has shown that the SRS contrast ratios of the sequences investigated in this paper, are significantly larger than the results in existing documents.
Keywords: SRS, Pseudorandom sequences, Contrast Ratio.