Effect of Phase Modulation on Electromagnetically Induced Grating in a Five-Level M-Type Atomic System

摘要

We theoretically investigate the phenomena of electromagnetically induced grating in an M-type five-level atomic system.It is found that a weak field can be effectively diffracted into high-order directions using a standing wave coupling field,and different depths of the phase modulation can disperse the diffraction light into different orders.When the phase modulation depth is approximated to the orders of π 27π and 3π the first-,second-and third-order diffraction intensity reach the maximum,respectively.Thus we can take advantage of the phase modulation to control the probe light dispersing into the required high orders.