We present an experimental scheme that achieves ideal phase detection on a two-mode field. The two modes a and b are the signal and image band modes of an heterodyne detector, with the field approaching an eigenstate of the photocurrent Ẑ = a + b†. The field is obtained by means of a high-gain phase-insensitive amplifier followed by a high-transmissivity beam-splitter with a strong local oscill...

We propose and demonstrate a 5-cm-long monolithic dual-wavelength single-longitudinal mode distributed Bragg reflector (DBR) all-phosphate fiber laser. Strong UV-induced fiber Bragg gratings are directly written in highly Er/Yb codoped phosphate fiber. The separation between gratings is selected as 1 cm to only excite two longitudinal modes in the DBR cavity. By exploiting the spatial hole burn...

In this work the electronics for a highest resolution heterodyne interferometer is presented. It comprises an analog front-end, a high speed dual channel analog-to-digital converter and a field programmable gate array for high speed, low latency signal processing. The gate array contains a system on chip (formulated in a hardware description language), consisting of the main processing block (l...

The reliable detection, sizing, and sorting of viruses and nanoparticles is important for biosensing, environmental monitoring, and quality control. Here we introduce an optical detection scheme for the real-time and label-free detection and recognition of single viruses and larger proteins. The method makes use of nanofluidic channels in combination with optical interferometry. Elastically sca...