LBTEK-Your Trusted Partner For Optoelectronic Experiments!

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	Anti-reflective coating	Dark count	Input method	Unit Price	Lead Time
SPDM25B New	400-1100 nm	650-1100 nm	＜25 cps	Free space	$8498.18	5 weeks
SPDM25B-PC New	400-1100 nm	650-1100 nm	＜25 cps	FC/PC Fiber Optic Interface (Maximum Fiber Core Diameter 62.5 μm)	$8498.18	5 weeks
SPDM100B New	400-1100 nm	650-1100 nm	＜100 cps	Free space	$4968.16	5 weeks
SPDM100B-PC New	400-1100 nm	650-1100 nm	＜100 cps	FC/PC Fiber Optic Interface (Maximum Fiber Core Diameter 62.5 μm)	$4968.16	5 weeks
SPDM500B New	400-1100 nm	650-1100 nm	＜500 cps	Free space	$3007.05	5 weeks
SPDM500B-PC New	400-1100 nm	650-1100 nm	＜500 cps	FC/PC Fiber Optic Interface (Maximum Fiber Core Diameter 62.5 μm)	$3007.05	5 weeks

Single-photon detector, photosensitive area 300 μm

Dark count <500 cps (typical value)
Saturation count rate >10 Mcps
Fiber optic input

LBTEK single-photon detectors achieve a detection efficiency exceeding 55% at 700 nm wavelength, with dark counts <500 cps and dead time less than 50 ns, designed for fiber optic input. In specific application scenarios, ensure the module's operating temperature does not exceed 50 °C, as excessively high temperatures may cause the APD's operating temperature to rise, leading to increased dark count levels. APDs are highly sensitive photodetection devices; during avalanche mode, the input optical signal intensity should be controlled. Excessive light intensity may damage the APD, potentially reducing its detection sensitivity or, in severe cases, causing diode breakdown.

Quantum Efficiency vs. Wavelength Diagram

	Product Model	Spectral response range	Anti-reflective coating	Dark count	Input method	Unit Price	Compare	Lead Time
	SPD300A-PC	400 nm-1100 nm	400 nm-700 nm	＜500 cps	FC/PC Fiber Optic Connector	$2493.23		today
	SPD300A-APC	400 nm-1100 nm	400 nm-700 nm	＜500 cps	FC/APC Fiber Optic Connector	$2493.23		today