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Current Drift in the LDC500 Rev B. Revised Oct 2012 Figure 1: LD Current Thermal drift test setup A key specification for any laser diode driver is The test setup is shown in Figure 1. All thermal drift, which is the relative change in laser instruments are on a lab bench exposed to ambient current per degree Celsius change in ambient room temperature--no thermal test chamber is temperature. Absolute stability in laser diode used. current in turn translates to better optical performance, including wavelength and intensity An ultrastable, precision 10 resistor was used stability. Thermal drift in the output current is as the LDC500 laser driver's load. This resistor, caused by such factors as internal heating of which itself was specified with a 5ppm/