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Superconducting Single Photon Detector (SSPD)

 

We offer superconducting single photon detectors (SSPD) and ultra-low noise single-photon registration systems for the visible and near infrared range. All systems operate in a continuous mode (no gating).The system is based on fiber-coupled NbN superconducting single photon detectors and can have several independent channels (up to 4). For operation superconducting detectors need cryogenic temperatures, and we offer two types of cooling systems:

 

 

1)  Liquid Helium (LHe) based system

The system is designed as a cryogenic insert placed inside a standard LHe Dewar. That allows the use of the superconducting detectors without the need for expensive special cryogenic equipment. The LHe storage Dewar, filled with 100 liters of helium, allows up to 2 months of uninterrupted operation of the system. The main advantage of the system is higher quantum efficiency. There are detection systems available for two spectral ranges

 

Type of Registration System

Spectral range

Quantum efficiency

Type 2*

2 A

0.9-1.7 µm

≥ 22% at λ=1.0-1.2 µm

≥ 20% at λ=1.31 µm

≥ 16% at λ=1.55 µm

2 B

0.6-1.7 µm

≥ 25% at λ=0.7-1.1 µm

≥ 14% at λ=1.31 µm

≥ 10% at λ=1.55 µm

 

Main dimensions of cryogenic insert: height – 1100 mm, diameter – 30 mm.

 

2)  Cryogenic-free System

 

The closed-cycle refrigerator is a cryogenic-free cooling system which does not use liquid helium (the operating temperature is 2.5K). This type of detection system would be ideal for those who want to avoid handling with liquid helium. A particular advantage is that closed-cycle refrigerators can operate continuously for months from just an electrical power source. This makes long-term experiments possible. There are detection systems available for two spectral ranges:

 

Type of Registration System

Spectral range

Quantum efficiency

Type 1*

1 A

0.9-1.7 µm

≥ 20% at λ=1.0-1.2 µm

≥ 15% at λ=1.31 µm

≥ 12% at λ=1.55 µm

1 B

0.6-1.7 µm

≥ 18% at λ=0.7-1.1 µm

≥ 10% at λ=1.31 µm

≥ 7% at λ=1.55 µm

 

Element/Parameter

Closed-cycle refrigerator

Compressor

Control Unit

Weight, kg

25

75

1

Length x width x height

240x240x580mm

450x320x560mm

240x260x140mm

Preparation time

150 min

-

-

Maintenance, hours

10,000

30,000

0

Power consumption

1.5kW*

30W*

*Voltage of control unit and compressor: 100-240 V/ 50-60 Hz (can be adapted to any other standard networks)

 

 

 

System Characteristics

System Specifications

General Parameters

Timing jitter: <= 50ps

Number of channels: 1-4

Dark counts rate: <=10cps

Fiber: SMF 28e

Counting rate: >= 100MHz (Dead time <=10ns)

Original output voltage: 150mV

No afterpulsing

Possible types of output voltage: TTL, ECL, LVDS

Fiber Coupling (no misalignment)

Electrical connection: SMA

Operation in a continuous mode (no grating)

Driver interface: USB, LabVIEW

 

 

 

 

Type of System

System Components

LHe System

•Low temperature double wall dipstick with Cryogenic Insert:

–One / Two / Four single mode optical fibers (SMF 28e) with FC connectors;

–One / Two / Four coaxial cables with SMA connectors;

–Pressure transducer and temperature sensor;

–One / Two / Four fiber coupled superconducting detectors.

•Control Unit:

– One / Two / Four -channel precision DC-bias source for superconducting detectors;

–Temperature and pressure measuring unit;

–One / Two / Four Bias-T adapters;

–One / Two / Four amplifying chains;

–Set of connecting cables and SMA connectors;

–Power supply.

•Vacuum system:

–Oil pump;

–Pressure regulating system;

–Set of vacuum hoses and clamps.

•Adapter for Helium Dewar (DN-50 or other);

•Operation manual.

Cryogen-free System

•Closed cycle refrigerator (SUMITOMO, series SRDK 101 or other):

–One / Two / Four hermetical FC/PC-FC/PC adapters;

–One / Two / Four CuNi coaxial cables with SMA connectors;

–One / Two / Four hermetical SMA female – SMA female adaptors;

–Temperature sensor (1.4-300 K);

–One / Two / Four fiber coupled superconducting detectors in holders with singlemode optical fibers.

•Control Unit:

– One / Two / Four -channel precision DC-bias source for superconducting detectors;

–One / Two / Four Bias-T adapters;

–One / Two / Four amplifying chains;

–Set of connecting cables and SMA connectors;

–Power supply.

•Temperature monitor.

•Compressor.

•Operation manual.

 

Possible applications:

l  Photonic quantum computing

l  Photon correlation measurements

l  Quantum cryptography

l  Free space communication

l  LIDAR

l  Time-resolved fluorescence measurements

l  Picosecond Integrated Circuits analysis (PICA)

l  Single quantum dot/molecule fluorescence spectroscopy

l  Registration of extra low IR photon flux

l  Optical tomography

 

Advantages:

l  Operation in the visible and infrared ranges   (overlapping unavailable for the APD range);

l  Operation in a continuous mode;

l  No afterpulsing;

l  Very low level of dark counts (below 10 cps)

l  Picosecond time resolution;

l  High quantum efficiency (up to 25%);

l  One, two, or multi-channel systems are available;

l  Standard single-mode fiber input;

l  Easy to integrate with LabView and other standard environment;

l  Full-support service (installation, operation training, technical support);

l  Optimization of receiver system characteristics to the customer needs.

 

 

Terahertz Detection System

 

The Terahertz detection systems are optimized for three frequency ranges, which cover the overall range of 0.3-70 THz. The system incorporates a MoRe/NbN Superconducting Hot-Electron Bolometer (SHEB) mounted on a silicon/germanium lens and low-noise cryogenically cooled high electron mobility field-effect transistors (HEMT) amplifier. We offer the fastest Terahertz receivers, which have a sensitivity comparable with the best detection systems available today

 

 

 

Type 1, 1a: Hybrid antenna (Ř12 mm silicon hyperhemispherical lens and logarithmic periodic spiral antenna)

Type

1

1a

Frequency range, THz

0.3-3

Upper level of dynamic range, µW

(3dB compression point)

0.1

Noise equivalent power (NEP), WHz-1/2

5-7x10-14

3-5x10-13

Responsivity, V/W

(own HEB characteristic)

~10,000

~ 3,000

!Response time, ns

1

0.05

Sensitive material

MoRe

NbN

Bandwidth of HEMT amplifier, MHz

0.01-200

1-3500

Maximum power handling capacity

50 µW

Input beam

Max diameter

10 mm

Beam pattern

F/3 to F/∞ (collimated beam)

 

Type 2, 2a: Silicon lens (Ř12mm or Ř4mm silicon hyperhemispherical lens)

Type

2

2a

Frequency range, THz

1-12 (40)

Upper level of dynamic range, µW

(3dB compression point)

50

Noise equivalent power (NEP), WHz-1/2

1-2x10-11

6-8x10-11

Sensitivity, V/W

(own HEB characteristic)

~ 300

~ 100

!Response time, ns

1

0.1

Sensitive material

MoRe

NbN

Bandwidth of HEMT amplifier, MHz

0.01-200

1-3,500

Maximum power handling capacity

10 mW

Input beam

Max diameter

10 mm (3 mm)

Beam pattern

F/3 to F/∞ (collimated beam)

 

Type 3, 3a:    Germanium lens (Ř12 mm germanium hyperhemispherical lens)

Type

3

3a

Frequency range, THz

25-70

Upper level of dynamic range, µW

(3dB compression point)

2

Noise equivalent power (NEP), WHz-1/2

1-2x10-12

4-5x10-12

Responsivity, V/W

(own HEB characteristic)

~ 2,000

~ 500

!Response time, ns

1

0.1

Sensitive material

MoRe

NbN

Bandwidth of HEMT amplifier, MHz

0.01-200

1-3500

Maximum power handling capacity

1 mW

Input beam

Max diameter

10 mm

Beam pattern

F/3 to F/∞ (collimated beam)

General parameters:

l  Number of channels: 1 or 2

l  Electrical connection: SMA-50 Ohm

l  Driver interface: USB, LabVIEW

 

Advantages of the System:

l  Response time down to 50 ps

l  Possibilities for different beam geometry [beam pattern F/3 to F/∞ (collimated beam)]

l  Registration of short pulses(THz pulses from nano- to picoseconds)

l  Ultra-high sensitivity

 

 

Typical frequency dependence of the noise equivalent power (NEP) for three types of detecting system:

 

Blue line  - type 1;    Red line - type 2;     Green line - type 3

 

Two types of cooling system are available:

 

1)    Liquid helium Cryostat

Type of Cryostat

1

2

Volume of liquid helium

1 liter

2 liters

Liquid helium hold time

More than 5 hours

More than 7 hours

Weight

9kg

13kg

Height

380mm

490mm

Diameter

150mm

250mm

 

 

 

2)Closed-Cycle Refrigerator (Cryogenic-Free)

Element/Parameter

Closed-cycle refrigerator

Compressor

Control Unit

Weight, kg

25

75

1

Length x width x height

240x240x580mm

450x320x560mm

240x260x140mm

Preparation time

150 min

-

-

Maintenance, hours

10,000

30,000

0

Power consumption

1.5kW*

30W*

*Voltage of control unit and compressor: 100-240 V/ 50-60 Hz (can be adapted to any other standard networks)

 

 

Type of System

System Components

All types

1.Detection Unit

Based on:

Liquid helium cryostat

    (Capacity – 1 liter ( 2 liters))

    LHe bath hold time – ≥5 hours (≥7 hours)

or Closed cycle refrigeration

(time to reach operating temperature<2.5 hours)

 

    THz window

    IR radiation filter

    Cupronickel or Stainless steel coaxial cable

Bolometer holder:

SHEB Bolometet chip

Micro-strip line with SMA connector

Hypersemispherical lens (HRFZ Si or Ge)

    Heater

 

    Cryogenically cooled HEMT preamplifier

    Gain – >27 dB (with Bias-T adapter)

   

    Optimal frequency range:

    0.1 – 250MHz ; 1 ns version

    1 – 3500MHz ; 50ps version

 

 

2.Control Unit

Input voltage AC: 200-240 V, 50-60 Hz

 

Output for HEMT amplifier: DC +/-6 V, 50 mA

Output for Heater: DC 0-5 V, accuracy +/-1 mV

Output for bolometer: It can be used

in two modes - constant current and constant voltage

Room temperature amplifier (optionally):

0.1   – 250MHz

1 – 3500 MHZ

 

3.Compressor

 

4.Operation manual

 

  Scanning Spectrophotometer

Sintec Optronics Pte Ltd

10 Bukit Batok Crescent #07-02 The Spire Singapore 658079

Tel: +65 63167112 Fax: +65 63167113  

E-mail: sales@sintec.sg sales@SintecOptronics.com

URL: http://www.sintec.sghttp://www.SintecOptronics.com

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