We improve theoretically and experimentally the problem of the coupling between a high Q-factor resonator and its external coupler. We have observed oscillations of ringing induced by the sweeping of the excitation frequency of an active micro sphere. Thanks to this approach, quality factor of an optical resonator was measured and we obtained Q = 5.8×10.

From an optical perspective the eye is far from perfect. This is a fact that is extensively supported by literature; for instance, Prof. Navarro recently provided us with a fantastic critical review on the various theories behind the different eye models and their flaws.1 The human eye has considerable amounts of higher-order aberrations even when it is emmetropic,2 with great inter-individual ...

We enjoyed reading the article by Esteve-Taboada et al.,1 but were disappointed by their interpretation of their data. Their optical model has important limitations that make it inappropriate to make broad clinical generalizations from their findings. First, the “aberration-free” eye model is highly artificial. In particular, the absence of any spherical aberration is relevant to only a small p...

1. Optical quality of the eye was measured at eight pupil sizes between 1-5 and 6-6 mm diameter by recording the faint light emerging from the eye; this light was reflected from the bright image of a thin line on the fundus. 2. The nature of the fundus reflexion was examined; it was found that the fundus acts very much like a perfect diffuser while retaining polarization. 3. Using the result th...

Optical methods play an important role in process analytical technologies (PAT). Four examples of optical process and quality sensing (OPQS) are presented, which are based on three important experimental techniques: NIR absorption, luminescence quenching, and, as novel method, photon density wave (PDW) spectroscopy. Addressed is the evaluation of four process and quality parameters eminent in t...

A Shack-Hartmann aberrometer was used to assess the optical performances of eyes corrected with rigid or soft contact lenses compared with spectacles. Metrics of optical quality derived from the measured wave aberrations were consistent with the subjective rating of visual clarity by subjects. Optical aberration analysis illustrated the differences in aberration structures of eyes wearing diffe...

For the first time, the 4- and 5-port optical routers are designed by using the West First routing algorithm for use in optical network on chip. The use of the WF algorithm has made the designed routers to provide non-blocking routing in photonic network on chip. These routers not only are based on high speed Mach-Zehnder switches(Which have a higher bandwidth and more thermal tolerance than mi...

Development of the optical technology is extremely important in the field of science research, industrial production and daily appliances. Although a lot of researches have conducted in the area of processing optical lenses, very few attempts have been made at the quality of optical lenses. We established a Process Capability Analysis Model (PCAM) to discover the ineffective areas of quality it...