| 简介 |
CONTROL SYSTEM FOR THE LASER CAVITIES. The laser cavities generally have one or more high power laser diodes acting as sources of [...]. Not seldom, these diodes may drain hundreds of amps to a relatively low voltage, on the order of 1, 5 3, 0 volt. Many control systems pulse code modulation diode to maintain the optical power at the exit of the well at a constant level. This control is achieved by reading a photodiode that [...] the control circuit. The problem that most of these topologies provides is the response time of the cavity, making generation of pulses of duration with order of microseconds. Two effects are predominant for this limitation : the power supply and inductance of the electrical cables. Power supplies have response time the charge variation on the order of milliseconds. A load requiring a large amount of current transition in a very short time, its output voltage will undergo a abrupt drop that will endure to the stabilizing it to this new loading condition. On the other hand, the power cables of the diodes have an inductance of [...] parasite which responds proportionally to the variation of current with an undesirable oscillation voltage, whose levels are capable of damaging the load itself if it is sensitive as is the case of the laser diodes. The present material having a novel topology formed of a combination of hardware and software that solutions allows to initiating micro laser pulses up to 2 min s duration. This system still holds control power mesh closed via the readout of photodiodes that keeps the laser power levels and pre-set constant |
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