Realization of a PT-symmetric microchip laser in the polarization space using nanostructured laser mirrors

Abstract

We demonstrate the improved purity of the emission spectra of a Yb3+-doped Y3Al5O12 laser with resonant grating mirrors. When the two mirrors’ principal axes are twisted, both multiple longitudinal mode emission and dual polarization emission are suppressed. The proposed design enables a compact single mode laser, replacing more complex designs usually needed to achieve that goal.