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Selecting and Using Thermistors for Temperature Control

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Selecting and Using Thermistors for Temperature Control

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Thermally sensitive resistors (thermistors) are used widely in laser diode and detector cooling applications because of their high sensitivity, small size, ruggedness, fast response times, and low cost. When used properly with a thermoelectric (TE) cooler and support circuitry, a common thermistor costing less than a dollar has enough sensitivity to stabilize the temperature of a laser diode to better than 0.001°C. The price of the thermistor’s high sensitivity is paid with non-linearity, a factor which makes their selection and use a bit more challenging than might be otherwise expected.

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