Optical pump sources for lasers include not only flashlamps and arc lamps but other sources as well. These sources can be divided into four catagories. First, when new laser materials are invented, most often the first laser operation is achieved by pumping them with another laser. However, there are too many possible combinations of laser pumped lasers to discuss adequately in a single paper. This paper will mention only one of these sources, the laser diode array. The second class of optical pump sources can only be described as "unconventional" optical sources since this includes many different approaches to the pulsed generation of light. The third class is conventional noble gas flashlamps. The fourth category is additive lamps or lamps with radiation enhancing dopants.