Spin injection enhancement in CW VECSEL at room temperature using push-pull optical pumping

• Alexandre Joly, Ghaya Baili, Jean-marie George, Isabelle Sagnes, Daniel Dolfi, and Mehdi Alouini
• received 02/22/2024; accepted 04/17/2024; posted 04/18/2024; Doc. ID 522095
• Abstract: We report the enhancement of spin injection efficiency in an external cavity VCSEL based on a non-resonant pumping coupled with a polarized optical resonant illumination. This double pumping scheme allows both the injection of spin polarized electrons in the conduction band and the selection of the spin orientation for the electron/hole recombination laser process. Experimentally, a flip of the polarization state of the laser is achieved with an ellipticity of +31° (spin down) and -33° (spin up), so an increase of about 50% of the ellipticity in comparison to an optical non-resonant pumping alone.