Conoptics, Inc. 700 Series 716TGG

Certain lasers (e.g. diode lasers) are highly susceptible to the disturbing influences of back reflections and the -30 to -40dB isolation provided by Models 711A through 715 is inadequate. The Model 716 is specifically designed for such applications. Referring to Figure 3, it is seen to consist of two Faraday elements and three polarizer's. Only the center polarizer, P2, is rotatable about the beam axis. The Faraday elements are identical except for the magnetic field direction reversal so that, disregarding the effect of P2, their rotations cancel