Polarization purity for active stabilization of diode laser injection lock
Abstract
Injection locking of diode lasers is commonly used to amplify low power laser light but is extremely sensitive to perturbations in the laser current and temperature. To counter such perturbations, active stabilization is often applied to the current of the injection locked diode. We observe that the diode laser’s polarization extinction ratio (PER) greatly increases when injection locked, and therefore the PER provides a measure of injection lock quality. We report robust active stabilization of a diode laser injection lock based on the PER, demonstrating the technique at 399 nm wavelength where injection locking is typically less stable than at longer wavelengths. The PER provides a feedback error signal that is compatible with standard proportional integral differential servo controllers, requires no additional optical components beyond the optical isolator typically used in injection locking, and enables a large feedback bandwidth.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 01, 2021
- Source ID
- 10.1063/5.0059824
Entities
People
- I. Marques Van Der Put
- Paul Hamilton
- Robert D Niederriter
Organizations
- Defense Advanced Research Projects Agency
- Office of Naval Research
- University of California