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Highly effective infrared single photon detection method

A single-photon detection and single-photon technology is applied in photometry, optics, nonlinear optics and other directions using electric radiation detectors. It can solve the problems of affecting the power in the cavity of solid-state lasers and relying on the servo system to lock the resonance frequency of the cavity, etc., to achieve Easy connection Compatibility, wide wavelength selection range, good portability

Inactive Publication Date: 2008-03-26
EAST CHINA NORMAL UNIV
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Problems solved by technology

However, this method has a significant disadvantage: since the external resonant cavity is a passive cavity, in order to achieve the locking of the resonant frequency and the frequency of the pump light, it is necessary to rely on the servo system to lock the resonant frequency of the cavity
Since the defense line of the cavity mirror M6 is closely related to the power in the cavity of the solid-state laser, it may also affect the power in the cavity of the solid-state laser when adjusting the coincidence of the two beams of light

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Embodiment 11

[0029] The schematic diagram for realizing this embodiment is shown in FIG. 2 , the wavelength of the pulsed infrared single-photon light source is 1.06 μm, and the signal light is input through an optical fiber. Its polarization is controlled by a fiber polarization controller, so as to control the polarization direction of the signal light incident on the nonlinear crystal to achieve good phase matching conditions. The pump light source is an erbium-doped passively mode-locked fiber laser, which outputs pulsed light with a center wavelength of 1.55 μm and a bandwidth of 20 nm through the fiber, and its polarization is controlled by a fiber polarization controller to achieve a good phase in the nonlinear crystal matching conditions. The pulsed pump light has a high repetition rate (typically 80 MHz) and high peak power (typically 10 3 watt). The signal light and the pump light have the same repetition frequency, and are controlled by a synchronous controller S to make the t...

Embodiment 12

[0031] Compared with Example 1.1, the incident single-photon signal in this example is in the 1.31 μm band, and the corresponding converted signal is in the 0.71 μm band. The coatings on both surfaces of the nonlinear crystal involved in scheme 1.1 are adjusted to anti-reflection coatings in the bands of pump light 1.55 μm, incident signal light 1.31 μm, and outgoing signal light 0.71 μm. The phase matching condition of the nonlinear crystal is also adjusted to the sum frequency of 1.31 μm and 1.55 μm to obtain an output of 0.71 μm. Other components, implementation methods and steps are consistent with those in Embodiment 1.1.

Embodiment 21

[0033] As shown in FIG. 3 , the incident single photon signal in this embodiment is at 1.06 μm and is continuous light. The pump source is a continuous erbium-doped fiber laser. Compared with scheme 1.1, no synchronous controller is needed in this embodiment. Other components, implementation methods and steps are consistent with those in Embodiment 1.1.

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Abstract

The invention relaters to the weakly light signal detection field, especially to a kind of high-effect infrared single photon detection method including the infrared single photon signal source, the pumping source, the nonlinear crystal, the single photon signal channel and pumping light channel. It is characterized in that the pumping source is composed by the optical fiber laser; the infrared single photon signal inputted by the optical fiber transmission and the pumping light inputted by the optical fiber laser are coupled by the optical fiber polarized controller separately, which are inputted into the wavelength division multiplexer. The output pumping and signal light are outputted by one optical fiber collimator, which can save the complex system accesspries and adjusting process. It has the compact structure, good portable. The laser power is outputted stably, also it has good mode and easy for nonlinear coupling, so it can reach the good room mode matching of two beams in nonlinear crystal. The whole detector can be made by all optical fiber and has low energy cost. It is also convenience to connect other optical fiber devices and reaches the alter use of many systems.

Description

technical field [0001] The invention relates to the field of weak light signal detection, in particular to a novel high-efficiency infrared single-photon detection method. Background technique [0002] The commonly used infrared single photon detector at this stage is based on InGaAs-InP avalanche photodiode (InGaAs / InP-APD), but it has a large noise (dark noise per pulse reaches 5×10 -5 / ns), low efficiency (~10%), and low effective repetition rate (<100KHz), cannot meet the requirements for efficient detection of infrared single photons required in the field of information technology. Due to the lack of corresponding detectors with excellent performance in infrared single photon detection, it is impossible to fully utilize the advantages of low loss and low dispersion of infrared light in optical fiber and atmospheric transmission, which are unmatched by other bands, which has become a limitation for infrared band communication and other applications. one of the main o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J1/42G02F1/35
Inventor 潘海峰董华芳黎遥曾和平
Owner EAST CHINA NORMAL UNIV
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