Results of work on the assembly and adjustment of an original pentagon
al, two-loop interferometer are reported; the interferometer is a pass
ive version of a compact laser gravitational wave detector. It is show
n that the correlative automatic noise-compensation system developed f
or the project is capable of lowering the phase noise level in the res
ultant signal channel of the detector by two orders of magnitude. (C)
1998 American Institute of Physics. [S1063-7842(98)02305-8].