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A phase modulated RF current source is applied to an injection locked diodelaser operating at $780\unit{nm}$. This produces tunable phase modulatedsidebands of the laser suitable for stabilizing the length of an opticaltransfer cavity using the Pound-Drever-Hall technique. The Pound-Drever-Hallsignal is anti-symmetric about the lock point, despite the presence ofsignificant diode laser amplitude modulation. The stabilized optical transfercavity is used to frequency stabilize a 776 nm external cavity diode laser. Thestability and tunability of this transfer cavity locked laser is established byobservation of the hyperfine components of the $^{87}$Rb $5P_{3/2}-5D_{5/2}$transition in a vapor cell.

Injection-locked diode laser current modulation for Pound-Drever-Hall frequency stabilization using transfer cavities