An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 32 Search : optical
optical pulsar
  پولسارِ نوری، تپار ِ ~   
pulsâr-e nuri, tapâr-e ~

Fr.: pulsar optique   

A member of a rare class of pulsars, such as the → Crab pulsar and → Vela pulsar, which can be detected in the visible spectrum.

optical; → pulsar.

optical pumping
  پمپشِ نوری   
pompeš-e nuri

Fr.: pompage optique   

A process in which light energy is used to raise electrons from a lower energy level in an atom or molecule to a higher one. It is commonly used in laser construction, to pump the active laser medium so as to achieve population inversion. The technique was developed by 1966 Nobel Prize winner Alfred Kastler in the early 1950's.

optical; → pumping.

optical system
  راژمان ِ نوری، ~ نوریک   
râžmân-e nuri, ~ nurik

Fr.: système optique   

A collection of lens, prisms, mirrors, and/or other devices, placed in some specified configuration, to act on light (reflect, refract, disperse, polarize, etc.) and perform some definite optical function.

optical; → system.

optical thickness
  ستبرایِ نوری   
setabrâ-ye nuri

Fr.: épaisseur optique   

Same as → optical depth.

optical; → thickness.

optical transfer function (OTF)
  کریا‌یِ تراوژ ِ نوری   
karyâ-ye tarâvaž-e nuri

Fr.: fonction de transfert optique   

The function that provides a full description of the imaging quality of an optical system. A combination of the → modulation transfer function (MTF) and the → phase transfer function (PTF) , the OTF describes the spatial (angular) variation as a function of spatial (angular) frequency.

optical; → transfer; → function.

optical window
  روزنه‌یِ نوری   
rowzane-ye nuri

Fr.: fenêtre optique   

The optical portion of the electromagnetic spectrum that passes through the atmosphere all the way to the ground.

optical; → window.

optically
  نورانه، نوریکانه   
nurâné, nurikâné

Fr.: optiquement   

Adverb of → optical.

optical + -ly.

Nurâné, from nur, → light, + -âné "-ly;" nurikâné, from nurik, → optical, + -âné "-ly."

optically active
  نورانه ژیرا   
nurâné žirâ

Fr.: optiquement actif   

Relating to → optical activity.

optically; → active.

optically thick
  نورانه ستبر، نوریکانه ~   
nurâné setabr, nurikâné ~

Fr.: optiquement épais   

The qualifier of a medium in which the → optical depth is large, significantly larger than 1.

optically; → thick.

optically thick wind
  باد ِ نورانه ستبر   
bâd-e nurâné setabr

Fr.: vent optiquement épais   

A wind with the → sonic point located at large optical depth for continuum. In particular, → Wolf-Rayet star winds are → optically thick. However, the outer parts of W-R winds are → optically thin for continuum, and in those regions the matter flow is driven by the same mechanism as in the winds of OB stars.

optically; → thick; → wind.

optically thin
  نورانه تنک، نوریکانه ~   
nurâné tonok, nurikâné ~

Fr.: optiquement mince   

The qualifier of a medium in which the → optical depth is large, significantly smaller than 1.

optically; → thin.

optically violent variable (OVV) quasar
  کو‌آسارِ ورتنده‌ی ِ نورانه سورا   
kuâsâr-e vartande-ye nurâné surâ

Fr.: quasar variable optiquement violent   

A member of a small subset of quasars consisting of bright radio galaxies whose flux of visible light output can vary by as much as 50% in a single day.

optically; → violent; → variable; → quasar.

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