| 摘要 |
A laser pulse driving method comprises the steps of selecting a desired laser pulse energy level and a laser pulse width, and then determining a target flashlamp current level corresponding to the laser pulse energy level and the laser pulse width. Further, the method teaches generating a reference voltage corresponding to the target flashlamp current level at a first input of a comparator, closing a power switch to deliver an actual flashlamp current level to the flashlamp from a pulse capacitor, and then presenting a shunt voltage proportional to the actual flashlamp current level at a second input of the comparator. Further steps include, turning-on a comparator output when the shunt voltage is less than the reference voltage, receiving the comparator output at a first AND gate input, receiving a control signal at a second AND gate input for a time equal to the laser pulse width and then applying the AND gate output at a power switch driver when both the first and the second AND gate inputs are present. A power switch delivers the actual flashlamp current level from the pulse capacitor when the AND gate output is present whereby the laser pulse energy level is applied to the flashlamp in a laser pulse having the desired laser pulse energy level and laser pulse width.
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