Simple alignment fixtures to aid in maintaining the alignment of laser beams are described. The fixtures consist of four thermocouples arranged in horizontal and vertical pairs and bonded to an aperture. An analysis is presented to show that more sensitivity is achieved by using a position fixture and an angle fixture with focusing at the angle fixture as opposed to simply passing the beam through two separated fixtures. A measurement of the angular sensitivity using a focused beam at the angle fixture indicates that angular changes on the order of 10 microradians can be detected.