HP 5518A Interferometry Laser head

A look at a HP(/Agilent/Keysight) Interferometry laser head, a partial teardown and some info on interferometry applications and operation of Zeeman split lasers. Links to relevant sections of Sam’s Laser FAQ Sam’s Laser FAQ: General Overview of HP Interferometry Lasers: #hstgohp HP/Agilent Laser Principles of Operation: #hsthppoo Explanation of Axial Zeeman HeNe Laser Behavior #hstsazlb PIC32 based measurement display: #umd1twi