Comparison of Molecular Iodine Spectral Properties at 514.7 and 532 nm Wavelengths

Hrabina, Jan; Acef, O.; Burck, Frédéric Du; Chiodo, N.; Candela, Y.; Šarbort, Martin; Holá, Miroslava; Lazar, Josef

doi:10.2478/msr-2014-0029

Cited by 6 publications

(5 citation statements)

References 40 publications

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“…Next we performed the measurement of the hyperfine transition linewidths to determine and evaluate the resulted spectral properties and iodine purity of the manufactured borosilicate glass cells filled to saturation pressure [4,[21][22][23][24][25].…”

Section: Measurement Of the Cells Propertiesmentioning

confidence: 99%

“…With the advance in technology and manufacturing of solid-state lasers they are becoming more cost-effective laser source for interferometry. Traditional He-Ne laser could potentially be replaced with these new light sources in near future [2][3][4]. For example frequency doubled Nd:YAG laser offers better primary frequency stability, lower noise, shorter wavelength and also higher output optical power which is crucial for multidimensional interferometric systems where up to six laser interferometers have to be powered with the same source to minimize measurement uncertainties [5].…”

Section: Introductionmentioning

confidence: 98%

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Optical frequency references for laser interferometry

et al. 2015

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Optical frequency references for laser standards based on molecular iodine absorption cells represent one of the most used tool for frequency stabilization of lasers operating in a visible spectral range. In the industry oriented laser measurements and similar laser interferometry applications performed at atmospheric conditions, a refractive index of air plays a role of main uncertainty contributor. In these cases there is no need to use technologically complicated and expensive iodine references made of pure fused silica with precise pressure control of absorpbing media. A set of iodine cells made of borosilicate glass was filled with certain amount of absorbing media to define the saturation point of iodine inside. A combination of these two approaches (pyrex material and controlled saturation pressure of iodine) allows us to simplify the laser stabilization setup (there is no need of additional iodine pressure level control) and reduce the overall reference's costs with ensuring of sufficient frequency stability of the system at the same time. Spectral properties of manufactured cells were tested by hyperfine transitions linewidth measurement and comparison with results from traditional fused silica cells was done to investigate the long-term iodine purity inside the references. As the transitions linewidth method shows a very high sensitivity to iodine purity level, this method is proposed to be an alternative approach in investigation of contamination in iodine absorption cells where traditionally used techniques -laser induced fluorescence (LIF) and absolute frequency shifts measurement -can not be used.

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Section: Measurement Of the Cells Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Optical frequency references for laser interferometry

et al. 2015

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“…Ширина линий на этих длинах волн может дости-гать 100…200 кГц (полная ширина на полувысоте). Излучение в диапазоне 514…515 нм также содержит достаточно много узких линий, которые могут быть использованы в роли частотных опор [13]. Диапазон 514…515 нм недо-стижим для удвоенных по частоте Nd:YAG лазеров, однако может быть пере-крыт аргоновыми лазерами или титан-сапфировыми, а также Yb-волокон-ными с внешними удвоителями частоты.…”

Section: Introductionunclassified

514.5…515 nm wavelength emission for molecular iodine spectroscopy purposes

Skvortsov¹,

Vіshnyakov²

2015

Transaction of Scientific Papers of the NSTU

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В статье рассмотрено современное состояние проблем лазерной спектроскопии, в том числе использование паров молекулярного йода для целей построения стандартов ча-стоты. Разработан генератор второй оптической гармоники от перестраиваемого воло-конного иттербиевого лазера на основе внешнего резонатора с кристаллом LBO (LiB3O5 -триборат лития) для последующего использования в экспериментах по спек-троскопии молекулярного йода. Особенностью собранного генератора второй оптиче-ской гармоники является использование перестраиваемого волоконного иттербиевого лазера с распределенной обратной связью. Перестройка по длине волны осуществля-лась в диапазоне 1029…1030 нм посредством изменения температуры резонатора лазе-ра. В основе рассматриваемого генератора второй гармоники лежит двухзеркальный ре-зонатор и кристалл LBO, расположенный в перетяжке резонатора удвоителя. Для целей стабилизации лазерного излучения использовалась система автоподстройки частоты (АПЧ). Для повышения стабильности частоты лазера использовался эталон Фабри-Перо. Для стабилизации частоты удвоителя была использована схема Паунда-Дривера-Холла. В ходе экспериментов были измерены шумовые характеристики излучения вто-рой гармоники. Чтобы учесть вклад, вносимый самим фотоприемником, был измерен спектр шумов используемого фотоприемника. Полученные результаты сравнивались с шумовыми характеристиками, полученными от лампы накаливания с тем же уровнем засветки. Построен график зависимости шумовых компонент от частоты. Исследована зависимость выходной мощности излучения второй гармоники от длины волны излуче-ния в диапазоне 514.5…515 нм. Построен график зависимости величины выходной мощности второй гармоники от длины волны излучения. В результате проделанной ра-боты получено до 13 мВт излучения во второй гармонике с возможностью перестройки длины волны генератора.* Статья получена 17 февраля 2015 г.

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“…Our iodine cell is 500 mm long with wedged fused silica windows that are coated for 532 nm on all surfaces (ISI Brno). The cold finger at the center of the cell is 30 mm long and cooled to −15 • C, which follows the recommendation of the bureau of weights and measures (BIPM) This temperature corresponds to a vapor pressure of 0.76 Pa [137] or 0.83 Pa [192,193] . The two counterpropagating pump and probe beams pass the cell four times (Figure 9.2a), resulting in a total optical path length of 2000 mm.…”

Section: Iodine Referencementioning

confidence: 99%

“…Fixing the parameters δ = 4, f m = 161 kHz and φ = 0 results in a linewidth of γ ≈ 2 MHz. For comparison, the expected linewidth of the a 10 component is around Γ = 350 kHz at a vapor pressure of 0.83 Pa [193] . Thus, the iodine gas cell is probably contaminated, resulting in much higher vapor pressure, probably > 100 Pa.…”

Section: Iodine Spectrum Near 532 Nmmentioning

confidence: 99%

Precision Spectroscopy on OH

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This thesis describes the implementation of a high precision laser system which, as a first demonstration of its capabilities, has been used to measure electronic transitions from the X 2 Π 3/2 , v = 0, J = 3/2 rovibronic ground state to the 12 lowest levels of the A 2 Σ + , v = 0 vibronic state in the hydroxyl radical (OH) and the 16 lowest levels of the same vibronic state in the deuterated hydroxyl radical (OD). The relative uncertainty of the absolute frequency measurements is within a few parts in 10 11 . These electronic transition frequencies are determined by comparing the spectroscopy laser with reference frequency standards using an optical frequency comb (OFC). The OFC transfers the high short term stability of a narrow-linewidth I 2 stabilized referenced laser onto the spectroscopy laser around 308 nm. The second reference used with the OFC is an atomic clock, which provides an absolute accuracy of the measured transitions frequencies. The OH and the OD molecules are inside a highly collimated molecular beam, with the ultraviolet (UV) laser beam propagating perpendicular to it. This setup reduces possible pressure shifts and Doppler-broadening. Additionally, the laser beam is retroreflected to reduce Dopplershifts. Shifts due to Zeeman-, AC-Stark-and saturation-effects are also considered in the analysis, in an effort to determine the zero-field transition frequencies.Previous studies determined the absolute A ← X transition frequencies with an accuracy of approximately 100 MHz, based on rich Fourier-transform spectra. In contrast, this thesis supplies absolute electronic transition frequencies with an uncertainty of less than 100 kHz. These new measurements of the optical transition frequencies were combined with existing data for fine and hyperfine splittings in the A state and used to fit the parameters of an effective Hamiltonian model of the A 2 Σ + , v = 0 state of each isotopologue. Some of these newly-determined spectroscopic constants, are orders of magnitude more precise than the previous values.Future experiments will benefit from the improved accuracy of the electronic excitation frequencies determined in this experiment. As a next step, a new mid infrared laser will be used to probe the vibrational excitation frequencies of OH. This OFC-stabilized midinfrared optical parametric oscillator (OPO), which provides a narrow linewidth and wide tuning range, is also described in this thesis.

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Comparison of Molecular Iodine Spectral Properties at 514.7 and 532 nm Wavelengths

Cited by 6 publications

References 40 publications

Optical frequency references for laser interferometry

Optical frequency references for laser interferometry

514.5…515 nm wavelength emission for molecular iodine spectroscopy purposes

Precision Spectroscopy on OH

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