Birefringent atomic vapor laser lock in a hollow cathode lamp

We report a robust method of stabilizing laser to the frequency an atomic transition using hollow cathode lamp. In contrast standard dichroic vapor lock (DAVLL) method, which uses dichroism induced by longitudinal magnetic field, we employ birefringence transversal field. applied this $(5s^2)\ {}^{1}S_{0} - (5s5p)\ {}^{1}P_{1}$ (461 nm) Sr. Although is made ferromagnetic material, successfully field sufficient strength obtain error signal with theoretical maximum slope. This may be other lamps different species.