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DET50B
Ge Biased Detector

User Guide

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Summary of Contents for DET50B

Page 1: ...DET50B Ge Biased Detector User Guide...

Page 2: ...rk Current 6 4 5 Junction Capacitance 7 4 6 Bandwidth and Response 7 4 7 Terminating Resistance 8 4 8 Shunt Resistance 8 4 9 Series Resistance 8 4 10 Battery Check 8 4 11 Battery Replacement 9 Chapter...

Page 3: ...ct Current Alternating Current Both Direct and Alternating Current Earth Ground Terminal Protective Conductor Terminal Frame or chassis Terminal Equipotentiality On Supply Off Supply In Position of a...

Page 4: ...ight signals over 800 to 1800 nm range The unit comes complete with a photodiode and internal 12 V bias battery enclosed in rugged aluminum housing The DET50B includes a removable 1 optical coupler SM...

Page 5: ...best frequency performance and a variable terminator VT1 for output voltage flexibility Note the input impedance of your measurement device since this will act as a terminating resistor A load resisto...

Page 6: ...ased upon the incident light Depicted in Figure 1 is a junction photodiode model with basic discrete components to help visualize the main characteristics and gain a better understanding of the operat...

Page 7: ...ero biased The flow of current out of the device is restricted and a voltage builds up This mode of operation exploits the photovoltaic effect which is the basis for solar cells The amount of dark cur...

Page 8: ...dwidth and the response of a photodiode It should be noted that larger diode areas encompass a greater junction volume with increased charge capacity In a reverse bias application the depletion width...

Page 9: ...example and InGaAs detector has a shunt resistance on the order of 10 M while a Ge detector is in the k range This can significantly impact the noise current on the photodiode For most applications h...

Page 10: ...ach DET with an A23 12 V battery installed This battery is readily available at most retail stores as well as through Thorlabs The battery supplied will deliver about 40 hours with a 1 mA load roughly...

Page 11: ...ed upon the incident light and wavelength and can be viewed on the oscilloscope by attaching a load resistance on the output The function of the RC Filter is to filter any high frequency noise from th...

Page 12: ...diode since point A is held at the same potential as point B by the operational amplifier This eliminates the possibility of dark current Photoconductive mode The photodiode is reversed biased thus im...

Page 13: ...e a 10 M input impedance Point the detector toward a fluorescent light and verify that a 60 Hz 50 Hz outside the US signal appears on the scope If so the device should be operating properly and the pr...

Page 14: ...D 40 A Output Voltage VOUT 0 to 5 V General On Off Switch Slide Battery Check Switch Momentary Pushbutton Output BNC DC Coupled Package Size 2 8 x 1 9 x 0 83 70 mm x 48 mm x 21 mm PD Surface Depth 0 1...

Page 15: ...Chapter 7 Specifications 13124 S01 Page 14 7 1 Response Curve...

Page 16: ...5 Thread M4 x 6 35mm for EC 26 2 mm 1 03 in 19 1 mm 0 75 in 16 2 mm 0 64 in 48 0 mm 1 89 in 53 3 mm 2 10 in 70 1 mm 2 76 in 43 2 mm 1 70 in Battery Position Indicator Power Switch A Battery Cap Output...

Page 17: ...Chapter 8 Certificate of Conformance 13124 S01 Page 16 Chapter 8 Certificate of Conformance...

Page 18: ...such as Pure OEM products that means assemblies to be built into a unit by the user e g OEM laser driver cards Components Mechanics and optics Left over parts of units disassembled by the user PCB s...

Page 19: ...654444 www thorlabs com Email sales uk thorlabs com Support techsupport uk thorlabs com France Thorlabs SAS 109 rue des C tes 78600 Maisons Laffitte France Tel 33 0 970 444 844 Fax 33 0 825 744 800 w...

Page 20: ...www w thorlabs c com...

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