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U S E R ' S G U I D E
Nanosecond Photodetectors
Models 1621 & 1623
These photodetectors are sensitive to electrostatic
discharges and could be permanently damaged if
subjected even to small discharges. Ground your-
self adequately prior to handling these detectors or
making connections. A ground strap provides the
most effective grounding and minimizes the
likelihood of electrostatic damage
phone: (877) 835-9620
e-mail: tech@newport.com • www.newport.com
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Table of Contents
Related Manuals for Newport 1623
Summary of Contents for Newport 1623
- Page 1 U S E R ’ S G U I D E Nanosecond Photodetectors Models 1621 & 1623 These photodetectors are sensitive to electrostatic discharges and could be permanently damaged if subjected even to small discharges. Ground your- self adequately prior to handling these detectors or making connections.
- Page 2 Warranty Newport Corporation guarantees its products to be free of defects for one year from the date of shipment. This is in lieu of all other guarantees, expressed or implied, and does not cover incidental or consequential loss. Information in this document is subject to change without notice.
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Page 3: Table Of Contents
Contents Operation Introduction ......... . . 5 Using the Photodetector . - Page 4 This page has been intentionally left blank. 4 • Contents...
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Page 5: Operation
MHz where an electronic amplifier is not required. The large-diameter detectors and the DC response make alignment and operation of the Model 162X easy. Figure 1 shows the typical responsivity curves for the photodetectors used in the Models 1621 and 1623. Nanosecond Photodetectors Operation • 5... - Page 6 Figure 1: Typical Model 1623 responsivities Model 1621 and Model Model 1621 1623 1000 1200 1400 1600 1800 2000 Wavelength, nm Each Model 162X photodetector runs off a single 9-volt alkaline battery. The photoreceiver’s slim casing, shown below, makes it easy to position it in a set-up between closely spaced optics.
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Page 7: Using The Photodetector
Using the Photodetector Check the battery voltage. The Model 162X is powered by a single 9-volt alkaline battery. To check the battery condition, push the red power switch to the BATT CHK position. If the green LED lights up, the battery is in good condition; if the LED does not light, the battery needs to be replaced (see page 10). -
Page 8: Conserving Signal Strength
Conserving Signal Strength If you have a low-power signal, 50 of trans- impedance gain can lead to very small output voltages. If you need to conserve signal strength, it is important to focus your optical beam onto the photodiode. Adjusting the photodiode position for optimal signal is best performed as a two-step procedure: Set the load resistance to 10 k... -
Page 9: Supplying Your Own Load Resistor
Supplying your own load resistor At high frequencies, typical resistors begin to exhibit parasitic inductance and capacitance. For instance, if you want to operate on the Open setting and supply your own 100- resistor, you might be tempted to use ... -
Page 10: Checking And Replacing The Battery
must be certain that the circuit does not saturate itself on the DC level. Checking and Replacing the Battery The Model 162X is powered by a single, standard 9-volt battery. The battery lifetime depends on the load resistor and on the optical input power to the photodetector. -
Page 11: General Features And Principles
General Features and Principles Photoreceiver Circuitry The circuitry inside the Model 162X consists of a reverse-biased photodetector and a load resistor with three settings: 50 , 10 k , and Open. The 50- setting has 50-V/A sensitivity and can be used to achieve the 1-nanosecond response time. - Page 12 value. Figures 4 and 5 give typical frequency responses and pulse responses for the Model 162X photodetector. Figure 4: Typical frequency response for the Model 1623 on the 50-¾ setting Frequency, MHz When performing high-speed measurements, impedance-matching effects between your measurement apparatus and the photo-detector must be taken into consideration in order to achieve optimal high-speed response.
- Page 13 RC limited, and the response speed will typically be 50 ns. Figure 5: Typical pulse (a) Model 1621 response for the (a) Model 1621 and (b) Model 1623 photodetectors Time (ns) (b) Model 1623 Time (ns) A 0.15-ps pulse at 1.06 µm was used to test the...
- Page 14 This page has been intentionally left blank. 14 • General Features and Principles...
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Page 15: Using Filters And Optical Fiber
Using Filters and Optical Fiber Newport offers accessories, sold separately, to attach a 1"- diameter filter or an optical fiber to the detector. Both accessories attach to the casing using the 1.04-32 threads located in the casing around the detector. - Page 16 Figure 6: holes for Model 1280 tightening Retaining ring 1.04-32 1" filter holder for holding 1" thread or 25-mm optics. and the Model 1281 FC fiber adapter 6-32 nylon-tipped dia. 1.30" setscrew for (33.0) holding 1" or 25-mm optics. Model 1280 patent pending 1.04-32 thread...
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Page 17: Characteristics
Characteristics Physical Specifications Figure 7: 2.50 (63.5) Mechanical drawing of the Model 162X 1.16 (29.5) casing Battery check LED Output (BNC) Load resistor switch Power switch 1.040-32 Threaded hole 4.03 (102.3) 1.00 (25.4) 1.25 (31.8) 8-32 (M4) Threaded insert Nanosecond Photodetectors Characteristics •... -
Page 18: Photodetector Specifications
Photodetector Specifications Model # 1621 1623 Wavelength Range 350-1000 nm 800-1700 nm Detector Material/Type Silicon/PIN InGaAs/PIN Detector Diameter 0.8 mm 0.1 mm (with 1.5- mm-diameter ball lens) Typical Max. Responsivity 0.55 A/W (at 800 1.0 A/W (at 1600 Maximum Optical Power... -
Page 19: Customer Service
Customer Service Technical Support Information and advice about the operation of any Newport product is available from our applications engineers. For quickest response, ask for “Technical Support” and know the model number and serial number for your product. Hours: 8:00–5:00 PST, Monday through Friday (excluding holidays).
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