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   INFRARED PHOTO
   DETECTORS

   GENERAL PARAMETERS
   PbSe INFRARED DETECTORS
   UNCOOLED

   PbSe INFRARED DETECTORS
   COOLED

   INTERFERENCE FILTERS

   LIGHT EMITTING DIODES

   GENERAL PARAMETERS
       LE-34
       LE-42


Cooled PbSe infrared photoconductive detectors

Assembling of PbSe photo detectors on single or dual phase Peltier thermoelectro coolers (TECs) gives the opportunity to improve the stability of instruments, applied those detectors, in wide temperature range. It is also increase it's sensitivity.

Cooled photoresistors are basic manufactured in house TO-8 with windows from AR coated silicon or IR quartz. Optionally we are manufacturing two-element photoresistors, assembled together on one TEC both with assembled individual interference filters.

Typical operation conditions of photo detectors assembled on different types of TECs are the following:

       - Ambient temperature: +25oC
       - Operating temperature of photo detector: -25oC
       - Typical requirements for power supply of TEC's models at maximum cooling:
                                                                                                        TEC model 1MS-06-018: 2,2 V@ 1,5 A
                                                                                                        TEC model 1MS-04-032: 4,0 V@ 0,4 A



PHOTOCONDUCTIVE DETECTOR TYPE

PARAMETER

UNITS

PR2-28

PR2-34

PR2-38

Wavelength of max response (25oC)

µm

3.0+/-0.2

3.6+/-0.2

3.9+/-0.2

Spectral range (25oC)

µm

1.0...3.5

1.0...4.0

1.0...4.5

min

typ

max

min

typ

max

min

typ

max

Time constant τ (25oC)

μsec

150

200

300

60

80

100

30

50

80

Dark Resistance R (25oC)

KOhm

50

1000

30

350

30

300

Responsivity Su (*)peak, 573K)

V/W

60000

85000

40000

65000

15000

55000

Detectivity D* (573, 800, 1)

cmHz1/2W-1

2*109

2.6*109

1.5*109

2*109

1.2*109

2*109

Peak Detectivity D* (λpeak)

cmHz1/2W-1

3.6*1010

4.6*1010

1.8*1010

2.4*1010

6*109

1*1010

Power supply

V

3 (1x1mm); 5 (2x2mm); 10 (3x3mm) (in brackets: size of sensitive element)

Operation Temperature Range

oC

-40...+50

Storage Temperature Range

oC

-40...+60

(*) - 1x1mm size of sensitive element




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