LBTEK-Single Photon Detectors

Product Description

High detection efficiency
300 μm photosensitive area
Low dark count
Low afterpulse
Low timing jitter

LBTEK's Single Photon Detectors are ultra-sensitive photodetectors based on Si-APD. The detection wavelength range covers 400-1100 nm and can operate in both linear mode and Geiger mode. In Geiger mode, the gain exceeds 60 dB. The SPD series features a unique high-performance active quenching circuit, enabling continuous single-photon detection and supporting detection gates of arbitrary width and period. This circuit achieves avalanche quenching with over 20 dB suppression, optimizing the performance of the SPD series. The SPD series detectors operate at a low temperature of -30 °C through internal cooling to achieve the best signal-to-noise ratio. The cooling module is controlled by an efficient TEC with a precision of ±0.2 °C. The effective photosensitive detection area of the detector can reach up to 300 μm. The single-photon counting signal is converted into a digital TTL signal and transmitted via an SMA interface. Its highly integrated modular design facilitates OEM applications and industrial integration.

Single-photon detector, photosensitive area 100 μm

Dark Count Rate Minimum <25cps
Saturated Count Rate >15MHz
Free Space/Fiber Input

LBTEK single-photon detectors operate at wavelengths of 400-1100 nm, with an anti-reflection coating applied in the 650-1100 nm range. They are available in two types: free-space input and fiber input, catering to different application scenarios. Three dark count specifications are available (<25 cps, <100 cps, <500 cps), making them suitable for weak light and single-photon detection applications. High light intensity may damage the APD, potentially reducing its detection sensitivity, and in severe cases, even causing diode breakdown. The module should operate within a temperature range of -20 to 50°C. Excessive temperature can intensify thermally excited carriers, leading to an increase in dark counts.

Quantum Efficiency vs. Wavelength Diagram

Product Model	Spectral response range	AR Coating	Dark count	Input method	Unit Price	Lead Time
SPDM25B	400-1100 nm	650-1100 nm	＜25 cps	Free space	$8,908.29	today	Add Cart
SPDM25B-PC	400-1100 nm	650-1100 nm	＜25 cps	FC/PC Fiber Optic Interface (Maximum Fiber Core Diameter 62.5 μm)	$8,908.29	today	Add Cart
SPDM100B	400-1100 nm	650-1100 nm	＜100 cps	Free space	$5,207.93	today	Add Cart
SPDM100B-PC	400-1100 nm	650-1100 nm	＜100 cps	FC/PC Fiber Optic Interface (Maximum Fiber Core Diameter 62.5 μm)	$5,207.93	today	Add Cart
SPDM500B	400-1100 nm	650-1100 nm	＜500 cps	Free space	$3,152.17	today	Add Cart
SPDM500B-PC	400-1100 nm	650-1100 nm	＜500 cps	FC/PC Fiber Optic Interface (Maximum Fiber Core Diameter 62.5 μm)	$3,152.17	today	Add Cart