Abstract: The invention relates to an optoelectronic device (1) with a laser amplifier (3) at one side of which are present in the radiation path in that order: a lens (8), a polarization-changing element (17), and a mirror (9) which together with the element (17) forms an orthogonal reflector. Both the radiation to be amplified and the amplified radiation issue from the device at the other side of the amplifier (3). Such a device (1) has a very low sensitivity to the polarization of the radiation to be amplified and is particularly suitable for use at very high bit rates.A disadvantage of the known device is that its efficiency is not particularly high and not well reproducible.According to the invention, the lens (8) comprises a magnifying lens (8), and the mirror (9) is present substantially in the image plane of the magnifying lens (8). As a result, the alignment of the amplifier (3) with respect to the lens (8) is much less critical, so that the efficiency is higher and more reproducible.