Optically stabilized AlxGa1−xAs/GaAs laser using magnetically induced birefringence in Rb vapor

Abstract
Narrow‐band optical feedback is an effective method of reducing the linewidth and stabilizing the frequency of diode lasers. We have constructed an optically stabilized AlxGa1−xAs/GaAs laser using a rubidium vapor cell immersed in a dc magnetic field as an optical feedback element. The diode laser’s frequency locks to sub‐Doppler features of the rubidium spectrum and exhibits a reduction in linewidth from 30 MHz to 35 kHz.