Infrared single-photon detector
Keywords:
Infrared single-photon detector
Product Overview
Single-photon detectors are instruments used for detecting weak signals at the single-photon level, playing an indispensable role in numerous fields such as quantum optics, biophotonics, and laser ranging. In recent years, single-photon detectors have been widely applied in the field of quantum cryptography and have become the core device for photoelectric conversion of quantum signals.
The WT-SPD series infrared single-photon detectors are low-cost, low-dark-count-rate, and highly stable optoelectronic instruments developed on the basis of research into quantum cryptographic communication systems. The device employs an InGaAs/InP single-photon avalanche diode as its photosensitive element. In addition to adopting a range of internationally recognized noise-reduction and afterpulse-suppression techniques—including gated operation and dead-time suppression—it also incorporates an original differential filtering scheme. This innovative approach not only maintains high detection efficiency but further reduces the dark count rate.
Product Parameters
● Dark count rate
The products are categorized into three models based on their dark count rates: Ultra-Low Noise (ULN), Low Noise (LN), and Standard (STD). The dark count rate requirements for each model under gate widths of 1 ns, 2 ns, and 3 ns are shown in the table below.
| Product Model | Effective door width | 10% | 15% | 20% | 25% |
| WT-SPD300-ULN | 1ns | <2.00×10 -6 | <4.00×10 -6 | <8.00×10 -6 | <2.00×10 -5 |
| 2ns | <5.00×10 -6 | <1.00×10 -5 | <2.00×10 -5 | <5.00×10 -5 | |
| 3ns | <1.50×10 -5 | <3.00×10 -5 | <6.00×10 -5 | <1.50×10 -4 | |
| WT-SPD300-LN | 1ns | <5.00×10 -6 | <1.00×10 -5 | <2.00×10 -5 | <5.00×10 -5 |
| 2ns | <1.25×10 -5 | <2.50×10 -5 | <5.00×10 -5 | <1.25×10 -4 | |
| 3ns | <3.75×10 -5 | <7.50×10 -5 | <1.50×10 -4 | <3.75×10 -4 | |
| WT-SPD300-STD | 1ns | <1.00×10 -5 | <2.00×10 -5 | <4.00×10 -5 | <1.00×10 -4 |
| 2ns | <2.50×10 -5 | <5.00×10 -5 | <1.00×10 -4 | <2.50×10 -4 | |
| 3ns | <7.50×10 -5 | <1.50×10 -4 | <3.00×10 -4 | <7.50×10 -4 |
● Detection efficiency
The detection efficiency is set in four levels: 10%, 15%, 20%, and 25%. The deviations between the actual detection efficiencies and the nominal values under different detector gate widths and operating temperatures are shown in the table below.
| Effective door width | Nominal efficiency ( % ) | Actual Efficiency ( % ) |
| 1ns | 20 | 20 ± 2 |
| 1ns | 25 | 25 ± 3 |
| 2ns | 10 | 10 ± 2 |
| 2ns | 15 | 15 ± 3 |
| 2ns | 20 | 20 ± 5 |
| 2ns | 25 | 25 ± 5 |
| 3ns | 10 | 10 ± 3 |
| 3ns | 15 | 15 ± 4 |
| 3ns | 20 | 20 ± 7 |
| 3ns | 25 | 25 ± 9 |
● Effective door width
| Door width (ns) | Detection efficiency (%) | Effective door width range (ns) |
| 1 | 10% | 0.1–0.4 |
| 20% | 0.2 to 0.6 | |
| 2 | 10% | 0.3–1.0 |
| 20% | 0.6–1.2 | |
| 3 | 10% | 0.8–2.1 |
| 20% | 1.0–2.5 |
● Post-pulse rate
The post-pulse rate is less than or equal to 3% (@100 MHz detector trigger frequency, 10 MHz laser trigger frequency, optical pulse duration of 50 ps, 0.1 photon per pulse, 1 ns detection gate width, 10% detection efficiency, and a dead time greater than or equal to 100 ns).
Scope of application
● Quantum Cryptographic Communication
● Quantum optics, biophotonics
● Laser rangefinding
● Atmospheric and water environment monitoring
● Fluorescence Lifetime and Fluorescence Spectroscopy
● Time-resolved single-molecule spectroscopy
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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.
1.25 GHz Infrared Single-Photon Detector
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.
Infrared single-photon detector
Single-photon detectors are instruments for detecting weak signals at the single-photon level, playing an indispensable role in numerous fields such as quantum optics, biophotonics, and laser ranging. In recent years, single-photon detectors have been widely used in the field of quantum cryptography and have become the core device for photoelectric conversion of quantum signals.
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Address: No. 2800, Innovation Avenue, High-Tech Zone, Hefei City, Anhui Province, Innovation Industrial Park Phase II, E2-901/902
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