Astronomical spectrograph calibration with broad-spectrum frequency combs
نویسندگان
چکیده
منابع مشابه
Calibrating Astronomical Spectrographs with Frequency Combs
This thesis reports on the development of a frequency comb to improve the calibration of astronomical spectrographs. In 1999, the invention of the frequency comb initiated a revolution in the field of precision spectroscopy. It enabled measurement of transitions in atomic and molecular systems with unprecedented accuracy, and in recognition of this achievement, the Nobel Prize was later awarded...
متن کاملHigh-precision wavelength calibration of astronomical spectrographs with laser frequency combs
We describe a possible new technique for precise wavelength calibration of high-resolution astronomical spectrographs using femtosecond-pulsed mode-locked lasers controlled by stable oscillators such as atomic clocks. Such ‘frequency combs’ provide a series of narrow modes which are uniformly spaced according to the laser’s pulse repetition rate and whose absolute frequencies are known a priori...
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A direct measurement of the universe's expansion history could be made by observing in real time the evolution of the cosmological redshift of distant objects. However, this would require measurements of Doppler velocity drifts of approximately 1 centimeter per second per year, and astronomical spectrographs have not yet been calibrated to this tolerance. We demonstrated the first use of a lase...
متن کاملA 12.5 GHz-spaced optical frequency comb spanning >400 nm for near-infrared astronomical spectrograph calibration.
A 12.5 GHz-spaced optical frequency comb locked to a global positioning system disciplined oscillator for near-infrared (IR) spectrograph calibration is presented. The comb is generated via filtering a 250 MHz-spaced comb. Subsequent nonlinear broadening of the 12.5 GHz comb extends the wavelength range to cover 1380-1820 nm, providing complete coverage over the H-band transmission window of ea...
متن کاملHigh-precision wavelength calibration with laser frequency combs
We describe a possible new technique for precise wavelength calibration of high-resolution astronomical spectrographs using femtosecond-pulsed mode-locked lasers controlled by stable oscillators such as atomic clocks. Such ‘frequency combs’ provide a series of narrow modes which are uniformly spaced according to the laser’s pulse repetition rate and whose absolute frequencies are known a priori...
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ژورنال
عنوان ژورنال: The European Physical Journal D
سال: 2008
ISSN: 1434-6060,1434-6079
DOI: 10.1140/epjd/e2008-00099-9