A new ASE filter: the 20-fold prism monochromator

Bakker, L.; Freriks, JM; Kroesen, Gmw Gerrit

doi:10.1088/0957-0233/10/3/004

Cited by 5 publications

(5 citation statements)

References 1 publication

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“…In order to do this, we need an extra, third spatial filter in the setup, as proposed in Ref. 4. An intermediate solution is to insert one dispersion prism as a predisperser, and to use the first spatial filter as a bandpass filter.…”

Section: Discussionmentioning

confidence: 99%

“…This can be due to the fact that the prism surfaces are not as clean as during the measurements in Ref. 4. A second possible reason is the fact that the detection branch was not sufficiently shielded from the ASE filter and the laser, which results in extra stray radiation.…”

Section: A Stray Light Reductionmentioning

confidence: 97%

“…It is measured in the same way as described in Ref. 4. We measured the transmission at a cold- spot temperature of 250°C with a window temperature of 325°C, and at a cold-spot temperature of 300°C with a window temperature of 330°C.…”

Section: The Sodium Vapor Absorption Cellmentioning

confidence: 99%

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Thomson scattering using an atomic notch filter

Bakker

Freriks

Hoog

et al. 2000

Review of Scientific Instruments

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One of the biggest problems in performing Thomson scattering experiments in low-density plasmas is the very high stray light intensity in comparison with the Thomson scattering intensity. This problem is especially present in fluorescent lamps because of the proximity of the glass tube. We propose an atomic notch filter in combination with a dye laser and an amplified spontaneous emission ͑ASE͒ filter as a way of reducing this stray light level. The dye laser produces 589 nm radiation which is guided through the ASE filter that increases the spectral purity. The beam is then guided in the fluorescent lamp, where the Thomson scattering process takes place. The scattered light is collected and guided through a sodium vapor absorption cell, where the stray light is absorbed because it is resonant to the D 2 transition of sodium. The spectral width of the Thomson scattering light is large enough to be transmitted through the absorption cell. In this way we only measure the Thomson scattering light.

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Section: Discussionmentioning

confidence: 99%

Section: A Stray Light Reductionmentioning

confidence: 97%

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Thomson scattering using an atomic notch filter

Bakker

Freriks

Hoog

et al. 2000

Review of Scientific Instruments

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“…Background light shifts can be reduced with optical bandpass filters centered at the magic wavelength. Various techniques have achieved passbands with <1 nm bandwidth, including complex prism geometries [33], atomic vapor filters [34], and various types of reflection gratings [35,36] (potentially in conjunction with Fabry-Perot etalons [37]). Due to their relative simplicity and compact size, we have chosen a volume Bragg grating.…”

Section: Spectral Filteringmentioning

confidence: 99%

Characterization and suppression of background light shifts in an optical lattice clock

Fasano

Chen

McGrew

et al. 2021

Preprint

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Experiments involving optical traps often require careful control of the ac Stark shifts induced by strong confining light fields. By carefully balancing light shifts between two atomic states of interest, optical traps at the magic wavelength have been especially effective at suppressing deleterious effects stemming from such shifts. Highlighting the power of this technique, optical clocks today exploit Lamb-Dicke confinement in magic-wavelength optical traps, in some cases realizing shift cancellation at the ten parts per billion level. Theory and empirical measurements can be used at varying levels of precision to determine the magic wavelength where shift cancellation occurs. However, lasers exhibit background spectra from amplified spontaneous emission or other lasing modes which can easily contaminate measurement of the magic wavelength and its reproducibility in other experiments or conditions. Indeed, residual light shifts from laser background have plagued optical lattice clock measurements for years. In this work, we develop a simple theoretical model allowing prediction of light shifts from measured background spectra. We demonstrate good agreement between this model and measurements of the background light shift from an amplified diode laser in an Yb optical lattice clock. Additionally, we model and experimentally characterize the filtering effect of a volume Bragg grating bandpass filter, demonstrating that application of the filter can reduce background light shifts from amplified spontaneous emission well below the 10 −18 fractional clock frequency level. This demonstration is corroborated by direct clock comparisons between a filtered amplified diode laser and a filtered titanium:sapphire laser.

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“…This high level of ASE lead to the unwanted uorescence in the plasma and masked the required Thomson signal. To reduce the ASE level, an ASE lter based on the work of Bakker et al 29 was reproduced.This lter was consisted of 20 prisms (SF10 glass), which were oriented in four groups. For an equilateral prism and for a symmetrical zero beam, ® 0 , as de ned in Fig.…”

Section: Plasma Luminosity and Ampli Ed Stimulated Emissionmentioning

confidence: 99%

Filtered Thomson Scattering in an Argon Plasma

et al. 2002

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A ltered Thomson scattering technique has been developed to measure electron temperature T e and electron number density n e in an atmospheric pressure argon plasma.The problems of the strong background scattered light and the high plasma luminosity were resolved by employing an atomic vapor lter that provided strong attenuation of stray scattered light at the laser wavelength while simultaneously allowing the passage of the spectrally broad Thomsonscattered light. A relatively low-power Ti: sapphire laser (about 50 mJ/pulse) was used in conjunction with an optically thick rubidium notch ler. High spectral purity of the laser was achieved by developing an ampli ed stimulated emission lter. Because of the geometrical constraints of the plasma arc source, experiments were performed in the backscatter geometry. Information on the electron number density and the electron temperature was derived from the Thomson signal by tting a model curve to the data. The measurement results gave an electron temperature of 0:82 § § 0:06 eV and electron number density of 1:61 £ £ 10 16 § § 0:05 £ £ 10 16 electrons/cm 3 .

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A new ASE filter: the 20-fold prism monochromator

Cited by 5 publications

References 1 publication

Thomson scattering using an atomic notch filter

Thomson scattering using an atomic notch filter

Characterization and suppression of background light shifts in an optical lattice clock

Filtered Thomson Scattering in an Argon Plasma

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