A laser controller may operate a laser at a high power level, such as Class 3R, Class 3B, or higher, but may have safety interlocks to limit exposure to a safe level and may, as a system, be classified as Class 1. The laser controller may control a laser that transmits a light beam to a sensor, and may operate the laser in a high power mode when the sensor senses the light beam. While a laser is transmitting and the laser beam is not sensed, the laser may be operated within Class 1 power levels. When the light beam is broken, the laser controller may turn off the laser or change the power level to a safe level such that a person would not be exposed to any more energy than a Class 1 level. The laser controller may use various mechanisms to set a detection threshold and may use an ambient light sensor to determine when detection may be impossible.