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Physics of our days


Femtosecond lasers for astrophysics

 a, b
a Lebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation
b Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center, ul. Vavilova 38, Moscow, 119991, Russian Federation

Passively mode-locked continuous-wave (cw) lasers offer the unique feature of generating a strictly periodic train of absolutely identical femtosecond pulses, their emission spectrum representing a comb of equidistant narrow spectral lines separated by the interval determined by the pulse repetition rate. Thus, a cw femtosecond laser is a source of a regular optical frequency comb (OFC), which can be compared to a cesium frequency standard (second standard) for the precise measurement of optical frequencies for the development of extremely precise atomic clocks, precision spectroscopy and metrology. One of the main applications of OFCs based on cw femtosecond lasers is precision spectrometric measurements of Doppler shifts in stellar spectra appearing due to the radial motion of stars with respect to the observer. To provide the high measurement accuracy required for the search for and study of exoplanets, a precision calibrator for an astronomical spectrometer is required. Such a calibrator can be based on a femtosecond laser OFC. Laser systems for astronomic investigations, including femtosecond lasers for space studies, are considered. It is assumed that the development of these methods will provide direct measurements of the accelerated expansion of the Universe.

Fulltext pdf (624 KB)
Fulltext is also available at DOI: 10.3367/UFNe.0185.201508b.0817
Keywords: laser frequency combs, femtosecond fiber laser, cosmic laser, astronomic instruments
PACS: 42.62.−b, 97.82.−j, 98.80.−k (all)
DOI: 10.3367/UFNe.0185.201508b.0817
URL: https://ufn.ru/en/articles/2015/8/b/
000364717300002
2-s2.0-84947731746
2015PhyU...58..762K
Citation: Kryukov P G "Femtosecond lasers for astrophysics" Phys. Usp. 58 762–771 (2015)
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Received: 10th, March 2015, revised: 9th, June 2015, 9th, June 2015

Оригинал: Крюков П Г «Фемтосекундные лазеры для астрофизики» УФН 185 817–827 (2015); DOI: 10.3367/UFNr.0185.201508b.0817

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