A servo technique for concurrently providing wavelength locking and stimulated Brillouin scattering suppression in an external cavity laser. Rotatable pivot joints supporting the frame between opposed arms of a support yoke and enable the frame to be rotated to orient a selected plate in a forward-facing use position. The apparatus comprises a digital video camera, a laser light source, and a processor arranged to operate the camera to produce a plurality of images with different exposure times, receive the plurality of images from the camera and process the images to determine a power spectrum and determine perfusion from the power spectrum. A substrate consisting of a 5050 or 2575 WW % refractory metalrefractory metal nitride powder mixture should produce solid capacitors with higher capacitance recovery and lower ESR.