Femtosecond Pulses, Nonlinear X-waves, and Interpretation of their Far-Field Spectra

Coherent combination of femtosecond pulses via non-collinear cross-correlation and far-field distribution

Optics Letters ◽

10.1364/ol.41.000234 ◽

2016 ◽

Vol 41 (2) ◽

pp. 234 ◽

Cited By ~ 5

Author(s):

Jie Mu ◽

Zhilin Li ◽

Feng Jing ◽

Qihua Zhu ◽

Kainan Zhou ◽

...

Keyword(s):

Field Distribution ◽

Cross Correlation ◽

Far Field ◽

Femtosecond Pulses

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Interpretation of the spectrally resolved far field of femtosecond pulses propagating in bulk nonlinear dispersive media

Optics Express ◽

10.1364/opex.13.010729 ◽

2005 ◽

Vol 13 (26) ◽

pp. 10729 ◽

Cited By ~ 66

Author(s):

M. Kolesik ◽

E. M. Wright ◽

J. V. Moloney

Keyword(s):

Dispersive Media ◽

Far Field ◽

Femtosecond Pulses ◽

Spectrally Resolved

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Possible applications of fraunhofer holography in high resolution electron microscopy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100108258 ◽

1978 ◽

Vol 36 (1) ◽

pp. 222-223 ◽

Cited By ~ 1

Author(s):

N. Bonnet ◽

M. Troyon ◽

P. Gallion

Keyword(s):

Electron Microscopy ◽

High Resolution ◽

Transfer Function ◽

Radiation Damage ◽

High Resolution Electron Microscopy ◽

Far Field ◽

Field Region ◽

Crystalline Materials ◽

Resolution Electron ◽

The Ideal

Two main problems in high resolution electron microscopy are first, the existence of gaps in the transfer function, and then the difficulty to find complex amplitude of the diffracted wawe from registered intensity. The solution of this second problem is in most cases only intended by the realization of several micrographs in different conditions (defocusing distance, illuminating angle, complementary objective apertures…) which can lead to severe problems of contamination or radiation damage for certain specimens.Fraunhofer holography can in principle solve both problems stated above (1,2). The microscope objective is strongly defocused (far-field region) so that the two diffracted beams do not interfere. The ideal transfer function after reconstruction is then unity and the twin image do not overlap on the reconstructed one.We show some applications of the method and results of preliminary tests.Possible application to the study of cavitiesSmall voids (or gas-filled bubbles) created by irradiation in crystalline materials can be observed near the Scherzer focus, but it is then difficult to extract other informations than the approximated size.

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