B749_15 Datasheet, PDF (1/3 Pages) Hamamatsu Corporation – Photon drag detector

Photon drag detector
B749
High-speed detector with high sensitivity in
the 10 μm band (for CO2 laser detection)
The B749 is a photon drag detector that utilizes the photon drag effect in which carriers created by input photons are
dragged in the direction of photons, generating an electromotive force. The B749 ensures high-speed operation even at
room temperatures and has high sensitivity in the 10 μm band, making it well suited to detection of CO2 lasers.
Features
Room temperature operation with high-speed response
Applications
CO2 laser detection
Options (sold separately)
Magnet stand
A1447
Structure
Parameter
Photosensitive area
Output polarity
Specification
Unit
φ5
mm
Positive
-
Absolute maximum ratings
Parameter
Operating temperature
Symbol
Topr
Condition
Value
Unit
0 to +60
°C
Storage temperature
Incident light level
Tstg
-
DC light
Pulsed light
0 to +60
1
10
°C
J/cm²
MW
Note: Exceeding the absolute maximum ratings even momentarily may cause a drop in product quality. Always be sure to use the product
within the absolute maximum ratings.
Electrical and optical characteristics (Ta=25 °C)
Parameter
Symbol
Condition
Min.
Photosensitivity
S λ=10.6 μm
-
Rise time
tr 10 to 90%
-
Noise equivalent power
NEP λ=10.6 μm
-
Output impedance
-
-
Typ.
1.2
-
4 × 10^-3
50
Max.
-
1
-
-
Unit
mV/kW
ns
W/Hz^1/2
Ω
Precautions
The Ge element mounted in the detector package is susceptible to shocks and drop impacts. Handle the detector with extreme care.
Do not allow light higher than 10 MW/cm² to strike the detector element, because the element surface might be damaged.
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