We describe an ultrafast optics advanced laboratory comprising a mode-locked erbium fiber laser, auto-correlation measurements, and a free-space parallel grating dispersion compensation apparatus. The simple design of the stretched pulse laser used nonlinear polarization rotation mode-locking to produce pulses as narrow as 108 fs, full-width at half-maximum, at a repetition rate of 55 MHz and a...

To evaluate coherent structures in the dimension of time and scale, a new procedure based on the multiresolution analysis and multiresolution auto-correlation analysis is developed in this paper. By analyzing uand v-components of fluctuating velocity, the coherent structure and its scales can be identified when larger amplitude fluctuation and stronger auto-correlation are appeared at same wave...

A system for measuring the absolute spectral responsivity of solar cells is described. The system uses higher-powered LED arrays that are coupled to an optical light guide that together provide large area illumination. Two different measurement methods were developed and tested using this measurement apparatus. The first method is an individual LED lock-in technique that can be performed over a...

Fluorosis is a major public health problem in India. This cross-sectional observational study has been conducted in the fluoride endemic zones of Bankura district to evaluate the effect of fluorosis on the liver enzymes. This study was carried out in the Simlapal block of Bankura, on 100 subjects by using simple random sampling in which 50 were cases. The serum samples were collected from the s...