The Issues of Using Bench Power Supplies
Supplying power to a laser is delicate work. Your laser is extremely sensitive and easily damaged. A single pulse of excessive current, lasting only a few microseconds, can overheat and damage the light-emitting facets of a laser diode. A laser diode driver is always your safest and most effective method for powering a laser. The choice to use an alternative source, such as a bench power supply, should be carefully evaluated before proceeding. The answer depends on your application and on the performance of the specific bench supply in question.
A bench power supply should be thoroughly tested and characterized before you use it to power a laser. You will need to evaluate the quality of the controls and safety measures incorporated into a bench supply to determine whether it is suitable.