Single-photon detector board
Keywords:
Single-photon detector board
Product Overview
Infrared single-photon detection modules, as a crucial technology for detecting extremely weak signals, find extensive applications across numerous fields in physics, astronomy, chemistry, biology, medicine, and other disciplines. Time-correlated single-photon counting (TCSPC), which has evolved on the basis of infrared single-photon detection, has become a fundamental analytical technique in such diverse areas as fluorescence lifetime and fluorescence spectroscopy, diffuse optical tomography, laser scanning microscopy, time-resolved single-molecule spectroscopy, remote sensing, laser ranging, and optical time-domain reflectometry (OTDR). In recent years, with the advancement of quantum mechanics and information science, a new interdisciplinary field—quantum information science—has emerged, capturing the attention of both the physics and information science communities. Within this field, infrared single-photon detection technology also plays a pivotal role. Currently, infrared single photons are widely used as carriers of quantum information in quantum information research; consequently, infrared single-photon detection technology is of paramount importance. Infrared single-photon detector modules can detect infrared single photons that carry quantum information, convert them into electrical signals, and then extract the quantum information they encode through coincidence measurements, photon counting, and other methods.
The QCRP-SPD2050 single-photon detector (high-speed) module employs an InGaAs/InP avalanche photodiode as its photosensitive element. An integrated temperature-control circuit maintains the APD at a low operating temperature, while a high-speed, narrow-gate pulse mode effectively reduces dark counts and sustains high detection efficiency.
Module Description
① FC/PC: Optical input interface
② DET_OUT: Detection Output Interface
③ TRIG_IN: External Trigger Input Interface
④ FRE_SEL: Frequency Selection Input Interface (Not Enabled)
⑤ GND +12V: Power supply connector
⑥ TGR: Test Development Serial Port (not accessible to users)
⑦ PXIe backplane connector: When the detector module is installed in a PXIe chassis, power is supplied to the detector module via this connector.
Product Specifications
| Serial Number | Parameter Name | Performance Parameters |
| 1 | External Trigger Frequency | 1.25GHz |
| 2 | Detection efficiency | Under the conditions of a wavelength of 1550 nm, an optical pulse repetition rate of 10 MHz, and 0.1 photons per pulse: 50% |
| 3 | Dark counting | ≤ 2k |
| 4 | Post-pulse | ≤ 2% |
| 5 | Effective door width | 100–300 ps |
| 6 | Connector Type | SMA |
| 7 | Trigger Frequency | 1.25GHz |
| 8 | Trigger Level | Square wave or sine wave |
| 9 | Trigger Level Amplitude | ±350 mV |
| 10 | Input impedance | 50 ohms |
| 11 | Coupling method | AC coupling |
| 12 | Fiber Optic Connector Types | FC/PC |
| 13 | Fiber Optic Type | Single-mode fiber |
| 14 | Damage threshold for light intensity | 0dBm |
| 15 | Wavelength range | 950 nm to 1650 nm |
| 16 | Connector Type | SMA |
| 17 | Output level | Low-Voltage TTL |
| 18 | Pulse width | 10–60 ns |
| 19 | Output impedance | 50 ohms |
| 20 | External dimensions | Standard PXIe Dual-Slot Board |
| 21 | Power supply | DC 12 (2A) |
| 22 | Operating temperature | 5°C to 35°C |
| 23 | Relative humidity | 25%–75% |
| 24 | Storage temperature | -15°C to 55°C |
Attachment or auxiliary device
● Power cord
● Cable
● User Manual
● Inspection Report
● Certificate of Product Conformity
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The infrared single-photon detection module, as an important technology for detecting weak signals, finds extensive applications across numerous fields in physics, astronomy, chemistry, biology, medicine, and other disciplines.
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The WT-SPD320 infrared single-photon detector operates at a frequency as high as 1.25 GHz and uses an InGaAs/InP single-photon avalanche diode (SPAD) as its photosensitive element. It features an integrated multi-stage cooler and employs a sinusoidal gating mode. This detector boasts high integration, high detection efficiency, low dark count rate, and low afterpulse rate. It supports customizable frequency settings and single/dual-channel configurations. Moreover, the detector offers a wide range of user-friendly operational functions, including support for both internal and external clock triggering, synchronized clock output, and adjustable detection efficiency and dead time—all via an intuitive user interface and set of convenient interfaces.
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