Abstract: An optical arrangement for the feedback-free coupling of the laser emission emitted by a semiconductor laser into an optical fiber, characterized by a first optical lens for receiving the output of the semiconductor laser, a first optical isolator composed of a Faraday rotator and a polarizer following in the propagation direction of the laser emission, a second optical isolator being composed of a second Faraday rotator and a second polarizer that has a higher blocking attenuation compared to the blocking attenuation of the first polarizer being arranged between the first lens and the optical isolator. In order to use the optical arrangement in an optical heterodyne system, the blocking attenuation of at least -70 dB is obtainable in this arrangement.

Abstract: An arrangement for converting diverging polarized laser emission from a semiconductor laser into a convergent beam includes two optical lenses and an optical isolator formed of a Faraday rotator and at least one polarizer arranged in the beam path of the laser emission. The lens which lies farther from the semiconductor layer is a component of the Faraday rotator and is formed by a plano-convex lens having an curved side facing the semiconductor laser.