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Related Manuals for New Focus 1621
Summary of Contents for New Focus 1621
- Page 1 162x nanosec revB.fm Page 1 Friday, August 17, 2001 5:51 PM U S E R ’ S G U I D E Nanosecond Photodetectors Models 1621 & 1623 5215 Hellyer Ave. • San Jose, CA 95138-1001 • USA phone: (408) 284–6808 • fax: (408) 284–4824 e-mail: contact@newfocus.com • www.newfocus.com...
- Page 2 162x nanosec revB.fm Page 2 Friday, August 17, 2001 5:51 PM Warranty New Focus, Inc. 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.
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Page 3: Table Of Contents
162x nanosec revB.fm Page 3 Friday, August 17, 2001 5:51 PM Contents Operation Introduction ......... . . 5 Using the Photodetector . - Page 4 162x nanosec revB.fm Page 4 Friday, August 17, 2001 5:51 PM 4 • Contents NEW FOCUS, Inc.
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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 162x nanosec revB.fm Page 6 Friday, August 17, 2001 5:51 PM 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.
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Page 7: Using The Photodetector
162x nanosec revB.fm Page 7 Friday, August 17, 2001 5:51 PM Using the Photodetector 1. 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;... -
Page 8: Conserving Signal Strength
A). For example, with 10 mW of optical power, a responsivity of 0.5 A/W, and with the load set to 50 Ω , the photodetector will produce an output voltage of approximately (10 mW) · (0.5 A/W) · (50 V/A) = 0.25 V. 8 • Operation NEW FOCUS, Inc. -
Page 9: Supplying Your Own Load Resistor
162x nanosec revB.fm Page 9 Friday, August 17, 2001 5:51 PM 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- Ω... -
Page 10: Checking And Replacing The Battery
3. Unplug the old battery. 4. Install a new 9-volt alkaline battery. 5. Reinstall the back cover. 6. Test the new battery’s status by pushing the power switch to the BATT CHK position. 10 • Operation NEW FOCUS, Inc. -
Page 11: General Features And Principles
162x nanosec revB.fm Page 11 Friday, August 17, 2001 5:51 PM 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 Ω , 10 k Ω , and Open . The 50- Ω set- ting has 50-V/A sensitivity and can be used to achieve the ≤... - Page 12 flat frequency response in the 100-MHz to 500- MHz regime. Selecting the internal 50- Ω resistor will usually allow you to achieve a response speed which is limited by your detection equipment. Typical laboratory 12 • General Features and Principles NEW FOCUS, Inc.
- Page 13 MHz bandwidth. When you select the 10-k Ω resistor, the speed is 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...
- Page 14 162x nanosec revB.fm Page 14 Friday, August 17, 2001 5:51 PM 14 • General Features and Principles NEW FOCUS, Inc.
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Page 15: Using Filters And Optical Fiber
162x nanosec revB.fm Page 15 Friday, August 17, 2001 5:51 PM Using Filters and Optical Fiber New Focus 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 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 holes for tightening FC connector Model 1281 16 • Using Filters and Optical Fiber NEW FOCUS, Inc.
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Page 17: Characteristics
162x nanosec revB.fm Page 17 Friday, August 17, 2001 5:51 PM 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... -
Page 18: Photodetector Specifications
≤1 nanosecond (50-Ω Typical Rise Time Ω setting) setting) Typical detector capacitance 3 pF 0.8 pF Electrical Output Connector Power Requirements One 9-volt alkaline One 9-volt alkaline battery battery Typical Battery Lifetime >500 hours >500 hours 18 • Characteristics NEW FOCUS, Inc. -
Page 19: Customer Service
162x nanosec revB.fm Page 19 Friday, August 17, 2001 5:51 PM Customer Service Technical Support Information and advice about the operation of any New Focus product is available from our applications engineers. For quickest response, ask for “Technical Support” and know the model and serial numbers for your product. - Page 20 162x nanosec revB.fm Page 20 Friday, August 17, 2001 5:51 PM 20 • Customer Service NEW FOCUS, Inc.