Frequency Stabilization of AlGaAs DH Lasers

The frequency of AlGaAs DH lasers was stabilized at the resonant frequency of a Fabry-Perot interferometer by controlling the injection current. The interferometer was controlled by a Lamb dip stabilized He-Ne laser at 633 nm. The frequency stability obtained here was 2.0×10 -11 ≦σ≦2.1×10 -9 for 10 ms ≦τ≦500 s, where σ and τ represent the square root of the Allan variance and the integration time, respectively.