Laser feedback control systems

A laser feedback control system, comprising:

• a laser operable to emit a laser beam;
• a prism mirror comprising a first reflective external surface and an opposing second reflective external surface, the first reflective external surface oriented to reflect the laser beam at a first angle to a first direction of travel of the laser beam;
• a sampling mirror, the sampling mirror partially reflective and oriented such that the laser beam reflected at the first angle by the first reflective external surface encounters the sampling mirror at a polarization insensitive angle of incidence;
• and
• a detector positioned to detect a portion of the laser beam transmitted through the sampling mirror,
• wherein the second reflective external surface is oriented to reflect a portion of the laser beam reflected by the sampling mirror to the first direction.