OBB Corp has developed a line of InGaAs detectors that have outstanding performance and are offered at very reasonable prices. To achieve Ultra Sensitivity, our Detectors use a specially designed super quiet preamplifier and "immersed" light coupling optics. The coupling optics can collect light from a 22 mm spot size and deliver it to a 2 mm sensitive part of the detector. The preamplifier uses advanced proprietary drift and noise suppression circuitry. The preamplifier is decoupled from the AC line, to further reduce noise and a build-in rechargeable battery provides the power. The battery can be charged during the night by a supplied automatic charger.

There are two versions: TE cooled and room temperature. While the room temperature version is not as sensitive as the TE cooled, it is substantially less expensive. The TE cooled detector is ready for operation practically in a few minutes after it is turned on; there is almost no “cool–up” time. While virtually all InGaAs detectors use lock-in amplifier and a chopper for noise suppression—due to the fact that the preamplifier has DC coupling and extremely low noise and drift one can make measurements without a lock-in amplifier and a chopper. For data acquisition is the detectors come complete with computer interface and software.

 

• Unique design—The unique design allows for great sensitivity but at a low cost.
• TE or room temperature version—Room temperature operation is even less expensive
• No expensive add-ons—Chopper or lock-in are not required
• Wide spectral bandwidth—0.8–1.9 μm standard, can be extended to 2.6 μm as an option
• Complete system—Includes even software and computer interface

 

Comparison of emission scans of singlet oxygen with
Hamamatsu cooled IR PMT, InGaAs-TE and InGaAs under the same condition

Blue scan – InGaAs-TE detector (@ -30°C)
Red scan – Cooled (@ -60°C) Hamamatsu PMT H9170-45
Green scan – InGaAs (@ room temp.)

As can be seen from the comparison of data, the sensitivity of the 3100 series of InGaAs detectors is quite exceptional.

 

Specifications
Model	#3102 InGaAs-TE	#3101 InGaAs
Spectral Response, μm	0.8–1.9 (up to 2.6 μm optional)	0.8–1.9 (up to 2.6 μm optional)
Cooled Temperature	-30°C	Room Temperature
Responsivity, V/W	1 x 1010	1 x 1010
NEP @ 1.3 μm/300Hz, W/Hz-1/2	5 x 10 -15	9 x 10 -14
Time Response (FWHM), μsec	Shorter than 350	Shorter than 250
DC Coupling	Yes	Yes
Detector Size, mm	2	2

Data Acquisition Specifications:

Data Rate: 10,000 points/sec to 1 point/100 sec