【摘 要】
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We report a low-noise, high-signal-to-noise-ratio (SNR) balanced homodyne detector based on the standard tran-simpedance amplifier circuit and the inductance an
【机 构】
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State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Sh
论文部分内容阅读
We report a low-noise, high-signal-to-noise-ratio (SNR) balanced homodyne detector based on the standard tran-simpedance amplifier circuit and the inductance and capacitance combination for the measurement of the bright squeezedstate in the range from 1 kHz to 100 kHz. A capacitance is mounted at the input end of the AC branch to prevent the DC photocurrent from entering the AC branch and avoid AC branch saturation. By adding a switch at the DC branch, the DC branch can be flexibly tued on and off on different occasions. When the switch is on, the DC output provides a monitor signal for laser beam alignment. When the switch is off, the electronic noise of the AC branch is greatly reduced at audio-frequency band due to immunity to the impedance of the DC branch, hence the SNR of the AC branch is significantly improved. As a result, the electronic noise of the AC branch is close to?125 dBm, and the maximum SNR of the AC branch is 48 dB with the incident power of 8 mW in the range from 1 kHz to 100 kHz. The developed photodetector paves a path for measuring the bright squeezed state at audio-frequency band.
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