Compact spring guide rod laser

Abstract

Laser systems are provided. In one aspect a laser system has a battery unit and a transistor having a source and a drain in series with the laser and the battery unit with the laser with the transistor having a source, and a gate that allows sufficient current to flow to the laser to allow the laser to emit light when a voltage at the gate is at a higher level and that does not allow sufficient current to flow to allow the laser to emit light when a voltage at the gate is at a lower level. A microcontroller is operable in an active mode and a reduced power mode having an activation input connected to a switch, a reduced power input connected in parallel with the capacitor and an output connected to the gate. When the switch changes from a first state to a second state, the microcontroller enters an active mode generating a plurality of micro-pulses at the gate such that an active current is supplied that cause the laser to emit a continuous plurality of micro-pulses that when viewed by a human observer provide an apparently continuous laser pulse and when the microcontroller enters a power down mode, no micro-pulses are provided at the gate and a leakage current through the laser provides energy to maintain the processor in the power down mode of activation until the switch is again closed.