In this paper, an energy regulation method based on the combination of a half-wave plate (HWP) and polarization beam splitter (PBS) is proposed for fabrication apodized fiber gratings, which can effectively improve side lobe suppression ratio high-reflectivity Bragg gratings (FBGs) fabricated by femtosecond laser. The FBGs prepared has good repeatability flexibility. By inputting different type...

COMMUNITY EYE HEALTH JOURNAL | VOLUME 26 ISSUE 84 | 2013 37 In a previous issue (Community Eye Health Journal Vol 27 Issue 85) we reviewed ophthalmic operating microscopes. We learnt that they often include a second set of binoculars, part of what is commonly called an assistant or teaching scope, which allows another person to view the operation at the same time as the surgeon in charge. This ...

In general, a pair of uncorrelated Gaussian states mixed in a beam splitter (BS) produces a correlated state at the output. However, when the inputs are identical Gaussian states the output state is equal to the input, and no correlations appear, as the interference had not taken place. On the other hand, since physical phenomena do have observable effects, and the BS is there, a question arise...

We propose a new coherent atomic beam splitter that is based on the induced redistribution of photons in the intense field of two collinear standing waves with different frequencies. In the dressed-atom approach, we show that this scheme can provide a clear large-angle splitting into two components without being restricted to the Raman-Nath regime.

We demonstrate a coherent and dynamic beam splitter based on light storage in cold atoms. An input weak laser pulse is first stored in a cold atom ensemble via electromagnetically-induced transparency (EIT). A set of counter-propagating control fields, applied at a later time, retrieves the stored pulse into two output spatial modes. The high visibility interference between the two output pulse...

Atomic collision pairs in a light field form a microscopic interferometer. The light acts as the beam splitter and controls at the same time the amplitudes and phases of the interfering waves. We demonstrate the complete tunability using linear and elliptic polarization.