In a diode pumped Nd:YAG laser marker, a diode driver, a Q-switch driver and a DC power supply are needed. They are individual with large size and then the size of the laser marker is also large. It is not convenient to move the laser marker due to large size. We have developed a “3 in 1” laser power supply and the above power supplies are integrated into one unit with compact size. Features: Compact in size and light in weight. Modular design for convenient maintenance. Excellent performance. Portable for easy moving.