GaAlAs Sensors
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40 GaAlAs Diodes Sensors GaAlAs Diodes * TG-120-SD Features Monotonic temperature response from 1.4 K to 500 K Excellent sensitivity (dV/dT) at temperatures below 50 K Relatively low magnetic field-induced errors Rugged, reliable Lake Shore SD package designed to withstand repeated thermal cycling and minimize sensor self-heating Variety of packaging options TG-120-P Features The TG-120 gallium-aluminum-arsenide (GaAlAs) diode temperature sensors are particularly well suited for low to moderate magnetic field applications at low temperatures. The GaAlAs sensing element exhibits high sensitivity (dV/dT) at low temperatures. Voltage-temperature characteristics are monotonic over the sensor’s useful range from 1.4 K to 500 K (see data plots below). Gallium-aluminum-arsenide diodes are direct band-gap, single junction devices that produce small output variances in the presence of magnetic fields. Consequently, their low magnetic field dependence makes them ideally suited for applications in moderate magnetic fields up to five tesla. Temperature range: 1.4 K to 325 K P, PL, SD, CO, CU Reproducibility at 4.2 K: ±10 mK TG-120-PL Features Temperature range: 1.4 K to 325 K Small mass for rapid thermal response Typical GaAlAs Diode Voltage Values TG-120-SD TG-120-P TG-120-PL The Lake Shore SD Package – The Most Rugged, Versatile Package in the Industry The SD package, with direct sensor-tosapphire base mounting, hermetic seal, and welded platinum leads, provides the industry’s most rugged, versatile sensors with the best sample to chip connection. Designed so heat coming down the leads bypasses the chip, it can survive several thousand hours at 500 K (depending on model) and is compatible with most ultra high vacuum applications. It can be indium soldered to samples. Typical GaAlAs Diode Sensitivity Values * atent # 4,643,589, Feb 87, “Thermometry P Employing Gallium Aluminum Arsenide Diode Sensor” Lake Shore Cryotronics, Inc. www.lakeshore.com Lake Shore Cryotronics, Inc. (614) 891-2244 fax: (614) 818-1600 e-mail: info@lakeshore.com

GaMAs Diodes Standard curve Not applicable Maximum reverse voltage (diode) 2 V Maximum forward current (diode) 500 mA Dissipation at recommended excitation Thermal response time (typical) P and PL: Use in radiation Recommended for use only in low level Use in magnetic field Low magnetic field dependence when used in fields up to 5 tesla above 60 K - ' Short-term reproducibility data is obtained by subjecting sensor to repeated thermal shocks Physical Specifications Calibrated Accuracy for more information see Appendices B, D, and E 3 Long-term stability data is obtained by subjecting sensor...

42 GaAlAs Diodes Sensors For information on mounting adapters available for use with GaAlAs sensors, see page 25. Ordering Information Uncalibrated sensor Specify the model number in the left column only, for example TG-120-P . Calibrated sensor Add Calibration Range Suffix Code to the end of the model number, for example TG-120-P-1.4L. GaAlAs Diode Calibration Range Suffix Codes Numeric figure is the low end of the calibration Letters represent the high end: L=325 K, H=500 K Model number Uncal 1.4L 1.4H TG-120-P TG-120-PL* TG-120-SD TG-120-CO TG-120-CU TG-120-CU-HT *Below 10 K, calibration...