Fig. 4.

One of the 4 km arms of the Livingston Observatory (top); one of the optical benches (bottom) carrying a small injection telescope mirror inside one of the mirror vacuum chambers at LIGO.
Image credit: J Kern/LIGO.
International Journal of High-Energy Physics

One of the 4 km arms of the Livingston Observatory (top); one of the optical benches (bottom) carrying a small injection telescope mirror inside one of the mirror vacuum chambers at LIGO.
Image credit: J Kern/LIGO.