Absolute Te_2 reference for barium ion at 4554  nm

Dutta, Tarun; Munshi, D. De; Mukherjee, Monika

doi:10.1364/josab.33.001177

Cited by 14 publications

(9 citation statements)

References 23 publications

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“…The blue laser is made from a commercially available 450 nm diode which is frequency locked to a Te 2 transition which has been observed for the first time and reported in ref. 27, similar to what has been done for the 493 nm laser. The 614 nm laser is a frequency doubled laser produced by an optical-fibre based periodically polled crystal in single pass configuration from a master laser at 1228 nm.…”

Section: Methodssupporting

confidence: 63%

An exacting transition probability measurement - a direct test of atomic many-body theories

Dutta

Munshi

Yum

et al. 2016

Sci Rep

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A new protocol for measuring the branching fraction of hydrogenic atoms with only statistically limited uncertainty is proposed and demonstrated for the decay of the P3/2 level of the barium ion, with precision below 0.5%. Heavy hydrogenic atoms like the barium ion are test beds for fundamental physics such as atomic parity violation and they also hold the key to understanding nucleo-synthesis in stars. To draw definitive conclusion about possible physics beyond the standard model by measuring atomic parity violation in the barium ion it is necessary to measure the dipole transition probabilities of low-lying excited states with a precision better than 1%. Furthermore, enhancing our understanding of the barium puzzle in barium stars requires branching fraction data for proper modelling of nucleo-synthesis. Our measurements are the first to provide a direct test of quantum many-body calculations on the barium ion with a precision below one percent and more importantly with no known systematic uncertainties. The unique measurement protocol proposed here can be easily extended to any decay with more than two channels and hence paves the way for measuring the branching fractions of other hydrogenic atoms with no significant systematic uncertainties.

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Section: Methodssupporting

confidence: 63%

An exacting transition probability measurement - a direct test of atomic many-body theories

Dutta

Munshi

Yum

et al. 2016

Sci Rep

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“…In order to scan over a wide range of frequencies yet having a good resolving power we have used external cavity diode laser (ECDL) which is described in ref. [12]. The laser line width is estimated to be below 1 MHz with an output power of about 40 mW.…”

Section: Methodsmentioning

confidence: 95%

“…The scale of the 100 GHz frequency spectra has been obtained by stitching each neighborhood frequency range having more than one overlapping spectral lines. Within each scan range, about seven Te 2 lines have been observed [12]. Even though the spectral lines are within 7 GHz range, the peizo has been scanned by more than 10 GHz such that non-linearity near the edge of the scan can be avoided.…”

Section: Calibration Of the Frequenciesmentioning

confidence: 99%

“…While longer wavelength region can be made accessible by thermally exciting the molecule (having higher temperature of the gas cell), short wavelength spectra are generated by the strong spin-orbit coupling present in the molecule. The progress made in identifying a plethora of spectral lines starting in UV and continuing all the way above 600 nm makes a good choice as reference for quantum optics, quantum information and precision measurement experiments [9][10][11][12] spectroscopy where a saturated pump beam is sent through a tellurium vapour cell and a weak probe beam in the opposite direction. The beat signal, generated by this pump-probe beam after going through the Te cell, is picked up on the photodiode (PD) with a responsivity of 0.64 W/A and then demodulated the signal by mixing the ac part of it with the modulation frequency (f1) of electro-optic modulator (EOM) which has been employed to create the sidebands to the laser carrier frequency(f0).…”

Section: Introductionmentioning

confidence: 99%

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High resolution spectroscopy on Te2: New lines for reference

Dutta

Mukherjee

2019

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Ro-vibrational spectra of different electronic states of molecules are often used as absolute wavelength or frequency standards. These standards are also used to mitigate any slow drift of laser frequency during an experiment. In precision experiment, the two most commonly used molecular standards are iodine and tellurium, both are homo-nuclear diatomic molecules. The former is mostly used as standard for the long wavelength (600 − 900 nm) region, while the tellurium spectrum is widely used in short wavelength (400 − 550 nm) including near ultra violet. A comprehensive data on tellurium spectra can be obtained from the tellurium atlas [1]. However near the 455 nm range where a number of important atomic resonance line, the atlas provides no significant data. We have performed high resolution modulation transfer spectroscopy (MTS) on tellurium molecule in a hot cell in the region close to 455 nm wavelength thereby obtained more than 100 new spectral lines which were not observed before. The resolution of each of these peaks is about few MHz, making them suitable for laser frequency locking.

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“…In order to minimize the long term relative frequency drift of the cooling lasers, 650 nm laser is phase locked to a reference cavity along with 986 nm laser within a same zerodure spacer. The 455 nm laser is locked to a tellurium spectral line using modulation transfer spectroscopy (MTS) [19].…”

Section: Methodsmentioning

confidence: 99%

Magnetic coherent population trapping in a single ion

et al. 2018

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Magnetically induced coherent population trapping has been studied in a single trapped laser cooled ion. The magnetic field dependent narrow spectral feature is found to be an useful tool in determining the null point of magnetic field at the ion position. In particular, we use a double lambda scheme that allows us to measure the null magnetic field point limited by the detector shot noise. We analyzed the system theoretically and found certain long lived bright states as the dark state is generated under steady state condition.

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Absolute Te_2 reference for barium ion at 4554 nm

Cited by 14 publications

References 23 publications

An exacting transition probability measurement - a direct test of atomic many-body theories

An exacting transition probability measurement - a direct test of atomic many-body theories

High resolution spectroscopy on Te2: New lines for reference

Magnetic coherent population trapping in a single ion

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