High Quantum Efficiency (HQE) Balanced Detector

Noisy Labs' high quantum efficiency balanced detectors are engineered for precision measurements of squeezed states of light and weak signals carried by cw laser light. These systems exhibit very low electronic dark noise, providing a high dark noise clearance of more than 20 dB with maximally 20 mW of local oscillator power in the MHz frequency range. With a high quantum efficiency of >95% (and >99% by design), users can directly detect at least 10 dB of squeezed light. The common mode suppression ratio surpasses 50 dB at 1 MHz. 

To meet specific application needs, various customization options are available upon request. These include an integrated electronic mixing path for signal demodulation from the transimpedance amplifier, ideal for generating control and error signals to lock the relative phases of the signal and the local oscillator in a balanced homodyne detection scheme. This enables extended measurement periods with stable squeezed quantum noise. Modulation and demodulation frequencies are typically configurable between 1 and 100 MHz, tailored to customer specifications. 

Further customization extends to the gain and Noise Equivalent Power (NEP) of our balanced detectors, as well as the AC high-pass cutoff frequency. For these tailored solutions, we provide comprehensive test data and collaborate closely with clients to ensure the detection system is optimally matched to their unique application requirements.

Our high quantum efficiency balanced detectors are available at key wavelengths including 1064 nm and 1550 nm, as well as across the 400 nm to 1030 nm range.