Stanford Research Systems www.thinksrs.com-LDC Note 11 Setpoint Slew Rate free download

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LDC500 Series Laser Driver's Setpoint Slew Rate Rev B. Sept 2012 The output current setpoint slew rate on the One way to get a fast output current change is to LDC500 and LDC501 is set to 0.2mA/ms use modulation. The current change rate is (0.2Amp/sec) when you set the laser current from determined by the bandwidth setting and may also front panel buttons or the control wheel, or from a be affected by cable parasitic. The highest available remote command. The slew rate is always the same bandwidth is around 1MHz. despite range, bandwidth and mode settings. To achieve even higher frequency modulation, For example, it will always take 500ms for a directly injecting RF current into the laser diode can 100mA change in the output current, in high or low be used. Check another application note for detail. range, in high bandwidth or low bandwidth mode, and in Constant Current mode or Constant Power The LDC502 output current setpoint slew rate is mode. set to 0.7mA/ms (0.7Amp/sec) for all range, bandwidth and mode settings Stanford Research Systems www.thinksrs.com (408)7449040 -1-