HgCdZnTe DETECTORS PHOTOVOLTAIC OPERATION Photovoltaic operation is preferred for lower frequency applications, to avoid the bias current created 1/f noise. It also allows highest frequency operation, down to the 100 ps level. Response time in the photovoltaic mode is only limited by the carrier diffusion time through the very thin HgCdTe layer. Two forms of photovoltaic products are available: the magnetically (PEM) assisted ones and the photodiffusion (PD) effect assisted ones. The PD variety is now available even in TE cooled versions for optimum performance throughout the frequency spectrum. TECH NOTE 70777 HgCdZnTe Detector. n n n n n Broad spectral response 2 to 12 m and beyond DC to subnanosecond operation No flicker noise down to 0 Hz in photovoltaic mode Monolithic optical immersion Room temperature and TE cooled operation PD type detectors offer high speed response, ideal for applications involving short pulse lasers. Occassionally these detectors exhibit responsivity curves with both positive and negative wavelength response regions. We can select spectrally well balanced units for you, if you let us know that your application covers more than a single laser wavelength. Our Mercury Cadmium Zinc Telluride Detectors (HgCdZnTe) cover a broad spectral range, 2 to 12 m, and have excellent detectivity. Fig. 1 shows typical curves. They are excellent for infrared laser characterization and stabilization, for heterodyne detection, FT-IR, fast pyrometry, and radiometry. Optical immersion is a classical way to make a physically small detector (lower noise, lower bias requirements, lower bias current heating, etc.) look optically larger for more sensitivity. It is particularly easy to do with the monolithic manufacturing technique of our detectors, see Fig. 2. Our proprietary technique ensures a perfect optical match between lens and detector. We have removed the transmission limits normally set by bonding adhesives. Fig. 2 Schematic of optically immersed HgCdZnTe Detectors. Fig. 1 Typical detectivities of HgCdZnTe Detectors. 6-77 Tel 203*377*8282 Fax 203*378*2457 E-Mail res_sales@oriel.com URL www.oriel.com HgCdZnTe DETECTORS TECH NOTE GENERAL LIMITS AND PRECAUTIONS 1. CW irradiance must not exceed 20 W cm-2 for the optically immersed detectors and 100 W cm-2 for the non-immersed detectors. 2. Pulses shorter than 1 s must not exceed 10 kW cm-2 for the optically immersed detectors and 1 MW cm-2 for non-immersed detectors. 3. Avoid overbiasing of the detectors. 4. Avoid overdriving and reversing voltage connections on the TE coolers. Dimensions in inches (mm) Fig. 3 Dimensional diagram of HgCdZnTe Detectors and their mounts. SPECIFICATIONS AND ORDERING INFORMATION Room Temperature Detectors Useful Wavelength Range (m) 2-4 2-5 2-6 2-9 2 - 12 2 - 12 2 - 12 2 - 12 2 - 12 Window Material BaF2 BaF2 BaF2 BaF2 BaF2 No Window Ge, AR coated @ 10.6 m Ge, AR coated @ 10.6 m No Window Optimization Wavelength (m) 4 5 6 9 12 10.6 10.6 10.6 10.6 Typical Responsivity (V/W) @ Peak >1000 > 900 > 500 > 50 > 10 > 2 > 0.5 > 0.1 > 0.1 @ 10.6 m NA NA NA >3 >5 >0.3 >0.1 >0.02 >0.02 Typical D* (cm H21/2 W-1) @ Peak >1 x 1011 >5 x 1010 >3 x 1010 >2 x 109 >1 x 109 >2 x 108 >5 x 107 >1 x 107 >1 x 107 @10.6 m NA NA NA >4 x 107 >2 x 108 >3 x 107 >1 x 107 >2 x 106 >2 x 106 Max. Signal (V) <1 s 0.05 0.05 0.05 0.05 0.05 >0.1 >0.1 >0.4 >1 CW 0.05 0.05 0.05 0.05 0.05 >0.1 >0.03 >0.006 >0.015 Optically Immersed TE Cooled Photovoltaic Detectors* Useful Wavelength Range (m) 2-4 2-5 2-6 2-8 2 - 12 Window Material BaF2 BaF2 BaF2 BaF2 BaF2 Optimization Wavelength (m) 4 5 6 8 10.6 D* @ Peak >1 x 1011 >5 x 1010 >3 x 1010 >2 x 109 >2 x 109 Risetime (ns) <250 <200 < 80 < 10 < 3 Model No. 70877 70878 70879 70880 70881 Price ($) $ 1,831.00 $ 1,831.00 $ 2,192.00 $ 3,109.00 $ 3,180.00 * Common specifications: Field of View is 40, Detector Type is PD, Package Type is A, Operating temperature is 240 K, typical. 6-78 Contact us for further information on any of the products in this catalog COMMON SPECIFICATIONS Active area: Bias (mA): 1 x 1 mm* 1-25 for TE cooled detectors; 20-100 for 70785. Optimum bias level supplied with each detector shipped 30-400, data supplied with each detector; longer wavelength detectors are typically characterized by lower impedance 1 A typical Impedance (): TE cooler current: FOR OEM BUYERS... Significant price discounts and custom requirement accommodations for OEM or multiple unit customers is offered. Call us for information and a quotation for different packaging, element sizes, wavelength optimization, higher detectivities, faster response times, as well as extra cooling stages, small arrays, and custom electronics. * Detector sizes from 0.05 x 0.05 mm to 4 x 4 mm can also be provided. Contact Oriel for pricing and other details. Risetime (ns) <3000 <1000 <100 <30 <10 <1 <1 0.2, typical <1 Cooling (Typical Operating Temp.) TE (240 K) TE (240 K) TE (240 K) TE (240 K) TE (240 K) Room Temp. Room Temp. Room Temp. Room Temp. * PC = Photoconductive Field of View (degrees) >40 >40 >40 >40 >40 >40 >40 >60 >60 Detector Type* PC PC PC PC PC PD PEM PEM PC Optically Immersed Yes Yes Yes Yes Yes Yes Yes No No Package Type (See Figs. above) A A A A A B C D E PD = Photovoltaic (Photo diffusion effect assisted) Output Connection TO-8 TO-8 TO-8 TO-8 TO-8 BNC SMA SMA BNC Model No. 70754 70755 70756 70759 70762 70777 70782 70783 70785 $ $ $ $ $ $ $ $ $ Price ($) 1,468.00 1,661.00 1,995.00 2,801.00 3,087.00 2,080.00 2,295.00 2,067.00 823.00 PEM = Photovoltaic (Magnetically assisted) Accessories 79535 Detector Mount for Packages.........................$ B, C, D and E 70016 6 ft. (1.8 m) Long BNC to BNC Cable ............$ 70032 6 ft. (1.8 m) Long SMA to BNC Cable ............$ 70041 6 ft. (1.8 m) Long SMA to SMA Cable ............$ 70703 15 VDC Power Supply, 110 V ......................$ 70709 15 VDC Power Supply, 220 V ......................$ 89.00 28.00 50.00 50.00 297.00 297.00 70716 High Gain Voltage Amplifier ...........................$ 565.00 70717 High Gain Voltage Amplifier ...........................$ 662.00 with bias option 77057 TE Cooler Controller, 110 V ...........................$ 1,125.00 77058 TE Cooler Controller, 220 V ...........................$ 1,125.00 6-79 Tel 203*377*8282 Fax 203*378*2457 E-Mail res_sales@oriel.com URL www.oriel.com