Multiphoton induced cubic-to-quartic intensity dependent transition of anti-Stokes Raman signal

Mondal, Partha Pratim; Gilbert, Richard J.; So, Peter T. C.
March 2009
Applied Physics Letters;3/9/2009, Vol. 94 Issue 10, pN.PAG
Academic Journal
We show an interesting cubic-to-quartic pump intensity dependent crossover of anti-Stokes Raman signal. This is achieved by multiphoton induced excitation of higher vibronic states. The steady state solution of the population dynamics displays a fourth power dependence for anti-Stokes Raman signal in the pump dominated regime, while Stokes Raman signal continues to show cubic power dependence. Proposed nonlinear intensity dependence has the potential for realizing strong enhancement in anti-Stokes Raman signal and an efficient rejection of background noise.


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