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Gitin A.,Max Born Institute For Nichtlineare Optik Und Kurzzeitspectroskopie
Applied Optics | Year: 2012

Dispersion delay lines (DDLs) are used for dispersion compensation in ultrafast optics. Note that the correct determination of the time delay of DDLs is based on the tautochronism principle: in an optical system consisting of refracting and reflecting elements the time delay between any two wavefronts is the same for all rays. But for diffraction gratings this principle is not valid; the time delay between the wavefronts of incident and diffracted waves for different light rays is different. However, fortunately, a pair of diffraction gratings can be combined so that the input and the output wavefronts of the system still satisfy the tautochronism principle. There are only two such grating systems: Treacy's system and Martinez's system. Both these systems are closely related to each other: in Martinez's system one can see virtual Treacy's system. Note that according to the tautochronism principle, dispersion Martinez's system and virtual Treacy's system are equal in value but opposite in sign. © 2011 Optical Society of America.


Gitin A.,Max Born Institute For Nichtlineare Optik Und Kurzzeitspectroskopie
Optics Communications | Year: 2013

A two-grating stretcher is a dispersion delay line that is widely used in chirped pulse amplification for ultrafast laser pulses. If the stretcher consists of two reflecting diffraction gratings with a reflective perfect optical system between them, its dispersion can be calculated by using the concept of a zero-distance pulse front. We also use the concept of the zero-distance pulse front for characteristics of the aberrations in the real optical system of the stretcher. The similarity of these zero-distance pulse fronts allows us to study the influence of aberrations in the real optical system of the stretcher on its dispersion. © 2013 Elsevier B.V.


Gitin A.V.,Max Born Institute For Nichtlineare Optik Und Kurzzeitspectroskopie
Optics Communications | Year: 2010

We introduce the concept of "zero-distance pulse front" which provides a new way of representing the dispersion of the two-grating compressor in a pictorial manner. © 2009 Elsevier B.V. All rights reserved.


Gitin A.V.,Max Born Institute For Nichtlineare Optik Und Kurzzeitspectroskopie
Optics Communications | Year: 2012

A general theory of vignetting in real optical systems has been developed. Considered a beam of light rays limited by a field stop, an aperture stop inside of the real optical system (aberration vignetting) and a stop outside of it (natural vignetting). It is shown that each of these 2D-stops can be replaced by a virtual 4D-phase stop, and the result stop for 4D-phase result stops is their intersection. In case of an axially-symmetrical optical system with circular stop openings all phase stops are solids of revolution and can be fully characterized by their meridional cross sections in a 3D-space, which can be easily drawn. © 2012 Elsevier B.V. All rights reserved.


Gitin A.,Max Born Institute For Nichtlineare Optik Und Kurzzeitspectroskopie
Optics Communications | Year: 2012

Dispersion delay lines (such as the compressor and the stretcher) consisting of reflective optical elements (mirrors and reflection diffraction gratings), are now widely used in chirped-pulse amplification technique. It is shown that for their calculations the unfolding technique can be applied. According to this technique, the dispersion of the compressor and the stretcher can be characterized by the "zero-distant pulse fronts" in their spatial chirps. © 2011 Elsevier B.V. All rights reserved.


Gitin A.V.,Max Born Institute For Nichtlineare Optik Und Kurzzeitspectroskopie | Kalashnikov M.P.,Max Born Institute For Nichtlineare Optik Und Kurzzeitspectroskopie
Applied Optics | Year: 2015

The Wigner distribution function is a convenient way to describe image transformations in optical systems: spatial shearing, spatial frequency shearing, circular rotation, hyperbolic rotation, etc. The hyperbolic rotation can be represented as scaling of the Wigner distribution function with a separate scale factor for each axis direction. It is shown that if an optical system with positive lenses provides circular rotation of the WDF in the phase plane, with negative lenses it will provide hyperbolic rotation of the WDF function in this phase plane. ©2015 Optical Society of America.


Gitin A.V.,Max Born Institute For Nichtlineare Optik Und Kurzzeitspectroskopie
Optik | Year: 2011

A convolution is proposed to describe the influence of the source-object distribution and entrance pupil of an optical system on the fall-off of the irradiance from centre of the image plane to its edge. © 2010 Elsevier GmbH.

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