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MPPC

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Features of MPPC for precision measurement
Low crosstalk
The pixel that detects photons may affect other pixels, making them produce pulses separate from output pulses. This phenomenon is called crosstalk. The MPPC for precision measurement employs a structure that suppresses the occurrence of crosstalk. This has drastically reduced crosstalk in comparison with previous products (rate of occurrence reduced from 44% to 3%).
 
Low afterpulses
While an MPPC detects photons, delayed signals may be output separately from the output pulses. These signals are called afterpulses. The MPPC for precision measurement provides low afterpulses.
 
 
Low dark count
Improvement in material and wafer process technology has reduced the dark count down to approximately half that of previous products.

Previous product

S13360-3050CS

1 Mcps

0.5 Mcps

 

Widened operating voltage range
The MPPC operation voltage Vop can be expressed as breakdown voltage (Vbr) + overvoltage (Vov). As the operating voltage is increased, the gain and photon detection efficiency improve, but at the same time, crosstalk and dark count, which are noise components, also increase. With previous products, the voltage dependency of noise components was high, and increasing the operating voltage caused a significant increase in noise components. On the other hand, with the MPPC for precision measurement, increase in noise components is suppressed even when the operating voltage is increased. Therefore, it can be used with high operating voltage (high gain and high photon detection efficiency).
 
 
LINEUP
MPPC modules
Analog output type

Type no.

Built-in MPPC

Photosensitive area

Pixel pitch

Noise equivalent power

High-band cutoff frequency

Temperature control

Supply voltage

C13365-1350SA

S13360-1350CS

□1.3 mm

50 μm

0.7 fW/Hz1/2

7 MHz

Temperature compensation (non-cooled)

±5 V

C13365-3050SA

S13360-3050CS

□3.0 mm

1.6 fW/Hz1/2

C13366-1350GA

TE-cooled type (MPPC for precision measurement)

□1.3 mm

50 μm

0.15 fW/Hz1/2

7 MHz

TE-cooled
(-20 °C)

±5 V

C13366-3050GA

□3.0 mm

0.3 fW/Hz1/2

 

Digital output type

Type no.

Built-in MPPC

Photosensitive area

Pixel pitch

Dark count

Maximum count rate

Temperature control

Supply voltage

C13366-1350GD

TE-cooled type (MPPC for precision measurement)

□1.3 mm

50 μm

2.5 kcps

10 Mcps

TE-cooled
(-20 °C)

±5 V

C13366-3050GD

□3.0 mm

15 kcps

 

Starter kit

Type no.

Temperature control

Supply voltage

Features

C12332

Temperature compensation (non-cooled)

±5 V

· Evaluates any non-cooled MPPC (sold separately)
· Includes C11204-01 power supply for MPPC
· Measurable just by setting MPPC operating voltage from PC

 

 

 

MPPC

Type no.

Effective photosensitive area

Pixel pitch

Package

S13360-1325CS

□1.3 mm

25 μm

Ceramic

S13360-1350CS

50 μm

S13360-1325PE

25 μm

Surface mount type

S13360-1350PE

50 μm

S13360-3025CS

□3.0 mm

25 μm

Ceramic

S13360-3050CS

50 μm

S13360-3025PE

25 μm

Surface mount type

S13360-3050PE

50 μm

S13360-6025CS

□6.0 mm

25 μm

Ceramic

S13360-6050CS

50 μm

S13360-6025PE

25 μm

Surface mount type

S13360-6050PE

50 μm

 

 

Measurable light level range

MPPC modules include two output types according to the incident light level (number of photons): analog output type and digital output type.

 

Selecting the digital output type or analog output type

The output type (digital or analog) should be selected according to the light level incident on the MPPC module. The following output waveforms (a) (b) and (c) show MPPC output waveforms measured at different incident light levels and observed on an oscilloscope. The incident light level was increased in the order of (a), (b), and (c), starting from (a) at very low light levels. The output signal of (a) consists of discrete pulses. In this state, selecting the digital output type allows measuring at a higher S/N, where the signals are binarized and the number of pulses is digitally counted. Since the digital output type can easily subtract the dark count from the signal, the detection limit is determined by dark count fluctuations.

As the light level increases, the output waveform consists of pulses overlapping each other [Figures (b) and (c)]. In this state, the number of pulses cannot be counted and the analog output type should be selected to measure the analog output and find the average value. The detection limit in the analog output type is determined by the dark current shot noise and the cutoff frequency of the readout circuit.
 
Block diagram
 
Connection example (C13366-1350GA)
 
 
 
 
Application examples of MPPC module
Fluorescence measurement
 
 
Flow cytometry
 
 
Scintillation measurement
 
 
Particle diameter measurement
 
 
Wafer surface inspection
 
 
Distance measurement
 

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