Semiconductor diode lasers are tiny sources of light powered by electricity. These are used extensively in medical and aesthetic applications. This patent application covers the concept of replaceable laser diodes for a wide range of applications. Historically, the high power laser sources have been prohibitively expensive to contemplate such an idea. However, as technology advances the price per Watt continues to fall dramatically. Somewhat analogous to the Gillette safety razor concept, this patent application describes how diodes can be replaced in a manner akin to the ordinary razor blade. Simply put, this invention describes replaceable laser light sources for aesthetic and medical applications.