Methods for Measurement and Verification of Purity of Iodine Cells for Laser Frequency Stabilization

Hrabina, Jan; Jedlička, Petr; Lazar, Josef

doi:10.2478/v10048-008-0025-8

Cited by 6 publications

(5 citation statements)

References 10 publications

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“…L3 laser is an ultra-stable diode-pumped ring laser with an intracavity frequency doubling. Both L1 and L3 are primarily intended for saturated sub-Doppler spectroscopy in iodine vapor at 532 nm wavelength and are designed to operate as laser optical frequency standards [21,25–32]. L4 laser is a simple diode pumped solid state laser (DPSSL) with alignment-free monolithic resonator equipped with slow thermal frequency tuning option which allows linear absorption spectroscopy frequency stabilization technique.…”

Section: Methodsmentioning

confidence: 99%

“…They offer relatively good long-term frequency stability up to range of 10 −11 when frequency-stabilized by saturated absorption of molecular iodine [15–17]. Stabilization to the active line in Ne offers stability at the 10 −8 level which is fully sufficient for measurements done under atmospheric conditions [18–21]. The main limitation in this case are the fluctuations of the refractive index of air (which can be controlled down to the range of approx.…”

Section: Introductionmentioning

confidence: 99%

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Frequency Noise Properties of Lasers for Interferometry in Nanometrology

Hrabina

Lazar

Holá

2013

Sensors

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In this contribution we focus on laser frequency noise properties and their influence on the interferometric displacement measurements. A setup for measurement of laser frequency noise is proposed and tested together with simultaneous measurement of fluctuations in displacement in the Michelson interferometer. Several laser sources, including traditional He-Ne and solid-state lasers, and their noise properties are evaluated and compared. The contribution of the laser frequency noise to the displacement measurement is discussed in the context of other sources of uncertainty associated with the interferometric setup, such as, mechanics, resolution of analog-to-digital conversion, frequency bandwidth of the detection chain, and variations of the refractive index of air.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Frequency Noise Properties of Lasers for Interferometry in Nanometrology

Hrabina

Lazar

Holá

2013

Sensors

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“…The windows are equipped with AR coatings for 500-540 nm wavelength region and both absorption cells have a cold finger in the central part for control of the iodine vapor pressure. Thanks to the long history of absorption cell preparation technology at the ISI, we had measured the molecular iodine purity in these cells by the method of induced fluorescence and we had also measured the absolute frequency shifts several years ago [13,16,36]. Both cells show excellent molecular iodine purity and absolute frequency shifts of iodine stabilized Nd:YAG laser below the 1 kHz level.…”

Section: B Molecular Iodine Absorption Cellsmentioning

confidence: 99%

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

Hrabina

Acef

Burck

et al. 2014

Measurement Science Review

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We present results of investigation and comparison of spectral properties of molecular iodine transitions in the spectral region of 514.7 nm that are suitable for laser frequency stabilization and metrology of length. Eight Doppler-broadened transitions that were not studied in detail before were investigated with the help of frequency doubled Yb-doped fiber laser, and three of the most promising lines were studied in detail with prospect of using them in frequency stabilization of new laser standards. The spectral properties of hyperfine components (linewidths, signal-to-noise ratio) were compared with transitions that are well known and traditionally used for stabilization of frequency doubled Nd:YAG laser at the 532 nm region with the same molecular iodine absorption. The external frequency doubling arrangement with waveguide crystal and the Yb-doped fiber laser is also briefly described together with the observed effect of laser aging.

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“…This can facilitate more complex interferometric setups with additional measuring axes and incorporating fiber-light delivery. Traceability to the primary standard of length has to be secured through linear spectroscopy of molecular iodine in an external absorption cell [ 21 – 23 ] offering sufficient stability.…”

Section: Conceptsmentioning

confidence: 99%

Short-Range Six-Axis Interferometer Controlled Positioning for Scanning Probe Microscopy

Lazar

Klapetek

Valtr

et al. 2014

Sensors

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We present a design of a nanometrology measuring setup which is a part of the national standard instrumentation for nanometrology operated by the Czech Metrology Institute (CMI) in Brno, Czech Republic. The system employs a full six-axis interferometric position measurement of the sample holder consisting of six independent interferometers. Here we report on description of alignment issues and accurate adjustment of orthogonality of the measuring axes. Consequently, suppression of cosine errors and reduction of sensitivity to Abbe offset is achieved through full control in all six degrees of freedom. Due to the geometric configuration including a wide basis of the two units measuring in y-direction and the three measuring in z-direction the angle resolution of the whole setup is minimize to tens of nanoradians. Moreover, the servo-control of all six degrees of freedom allows to keep guidance errors below 100 nrad. This small range system is based on a commercial nanopositioning stage driven by piezoelectric transducers with the range (200 × 200 × 10) μm. Thermally compensated miniature interferometric units with fiber-optic light delivery and integrated homodyne detection system were developed especially for this system and serve as sensors for othogonality alignment.

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Methods for Measurement and Verification of Purity of Iodine Cells for Laser Frequency Stabilization

Cited by 6 publications

References 10 publications

Frequency Noise Properties of Lasers for Interferometry in Nanometrology

Frequency Noise Properties of Lasers for Interferometry in Nanometrology

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

Short-Range Six-Axis Interferometer Controlled Positioning for Scanning Probe Microscopy

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