Parviz Parvin

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Questions related from Parviz Parvin

In all optical autocorrelation for femto-second pulse measurement: Why is a nonlinear SHG crystal situated in front of the detector?

There are two major techniques to measure ps - fs pulses of the mode-locked lasers: I) Steak camera II) Optical autocorrelation According to the space-time transformation in second-order...

02 January 2016 7,421 3 View

What are the advantages and disadvantages of Stable versus unstable resonator?

Laser with stable resonator creates the axial and traverse modes. The mode frequency is a function of mirror radii and the resonator length as well as the effect of transverse modes. What about...

06 March 2015 9,098 4 View

Is there any relation between coherence and polarization as two distinct properties of light?

To my knowledge, there is no solid correlation between temporal or spatial coherence and the polarization of light (linear, circular or elliptical) because the coherence arises from the nature of...

05 January 2015 3,980 12 View

Why is the electron mobility of graphene extraordinarily high?

Graphene is a nano structure. It is a 2-D carbon sheet with a honeycomb structure that exhibits extraordinary physical and electrical properties. One outstanding electrical property of graphene is...

16 December 2013 4,951 5 View

How can we find any correlation between stimulated emission and coherence to rewrite the rate equations?

Despite the set of rate equations formulate the instantaneous population of the upper and lower levels, the population inversion of laser transition, gain and saturation properties, however those...

09 November 2013 4,365 6 View