and a second optical beam 315 a first circulator circulates the first optical beam through a fiber stretcher to a translation stage of an adjustable optical telescope 320 then a first mirror on the translation stage reflects the first optical beam 325 the first circulator then circulates a first circulated beam which comprises the first optical beam and an adjustable optical telescope beam to a first dichroic beam splitter 330 the first dichroic beam splitter splits the first circulated beam into the first optical beam and the adjustable optical telescope beam 335 a second circulator circulates the second optical beam to a reference optical telescope 340 then a second mirror reflects the second optical beam 345 the second circulator then circulates a second circulated beam which comprises the second optical beam and a reference optical telescope beam to a second dichroic beam splitter 350 the second dichroic beam splitter splits the second circulated beam into the second optical beam and the reference optical telescope beam 355 the first optical beam and the second optical beam are input into an interferometer 360 the interferometer outputs an in phase signal and a quadrature signal which together form a sinusoidal signal 365 then at least one processor filters the sinusoidal signal to form a high frequency signal and a low frequency signal 370 a stage controller controls the translation stage by using the low frequency signal 375 a fiber stretcher controller controls the fiber stretcher by using the high frequency signal 380.