Abstract

We propose a scheme for a beam splitter and a beam router via an electromagnetically induced blazed grating in a four-level double-$\mathrm{\Lambda }$ system driven by an intensity-modulated coupling field and an incoherent pump field. The blazed grating relies on the incoherent pump process, which helps in inducing large refractivity with suppressed absorption or even gain. Consequently, the weak probe beam can be effectively deflected with high diffraction efficiency, and, meanwhile, its energy is amplified. When using an intensity mask with two symmetric domains in the coupling field, the presented blazed grating provides the possibility of a symmetric beam splitter. The diffraction efficiency and diffraction order of the gratings are sensitive to the intensity of the coupling field, and, thus, the gratings can function as a tunable asymmetric beam splitter or a beam router, which distributes the probe field into different spatial directions. Therefore, the proposed scheme may have potential applications in optical communication and networking.

© 2017 Optical Society of America

Blazed gain grating in a four-level atomic system

Shang-qi Kuang and Hai-gui Yang
J. Opt. Soc. Am. B 30(1) 136-139 (2013)

Tunable double electromagnetically induced grating with an incoherent pump field

Azar Vafafard and Mostafa Sahrai
J. Opt. Soc. Am. B 37(2) 244-250 (2020)

Electromagnetically induced grating in the microwave-driven four-level atomic systems

Rasoul Sadighi-Bonabi, Tayebeh Naseri, and Morteza Navadeh-Toupchi
Appl. Opt. 54(3) 368-377 (2015)

Squeezing induced high-efficiency diffraction grating in two-level system

Guang-Ling Cheng and Ai-Xi Chen
Opt. Express 25(4) 4483-4492 (2017)

Efficient electromagnetically induced phase grating via quantum interference in a four-level N-type atomic system

Tayebeh Naseri and Rasoul Sadighi-Bonabi
J. Opt. Soc. Am. B 31(10) 2430-2437 (2014)