Short-term stability of laser-pumped rubidium gas cell frequency standard

Saburi, Y.; Koga, Y.; Kinugawa, S.; Imamura, Toshiki; Suga, H.; Ohuchi, Y.

doi:10.1049/el:19940461

Cited by 16 publications

(6 citation statements)

References 3 publications

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“…The ac Stark shift or "light shift" of the clock transition induced by the pump light field [13], [14] constitutes a major source of instabilities in optically pumped atomic clocks [5], [8]. In the case of low pump light intensities present in optically pumped clocks, the interaction between the light field and the atomic levels causes the clock transition frequency f C to exhibit a dispersive shape as a function of the pump-light laser frequency ν L .…”

Section: B Light Shiftmentioning

confidence: 99%

Experimental Demonstration of a Compact and High-Performance Laser-Pumped Rubidium Gas Cell Atomic Frequency Standard

Affolderbach

Droz²,

Mileti

2006

IEEE Trans. Instrum. Meas.

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Abstract-The authors present a compact high-performance laser-pumped Rubidium atomic frequency standard exploiting the advantages of laser optical pumping for improved stability. The clock is based on an industrial Rb clock with the lamp assembly removed and optically pumped by light from a compact frequency-stabilized laser head. The modification of the buffer gas filling in the clock resonance cell reduces instabilities on medium-term timescales arising from the ac Stark effect and temperature variations. The frequency stability of the demonstrator clock was measured to be better than 4 × 10

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Section: B Light Shiftmentioning

confidence: 99%

Experimental Demonstration of a Compact and High-Performance Laser-Pumped Rubidium Gas Cell Atomic Frequency Standard

Affolderbach

Droz²,

Mileti

2006

IEEE Trans. Instrum. Meas.

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“…From the measured double-resonance signals at the low pump light powers used, we derive a shot-noise limit for the short-term stability to be around 2•10 -13 -1/2 [3] and an overall stability limit around 1•10 -12 -1/2 [12]. Still better signal contrast up to 60% and thus improved short-term stability can be reached at higher light intensities or using schemes for still higher signal contrast [13] Light Shift The AC Stark shift or "light shift" of the clock transition induced by the pump light field constitutes a major source of instabilities in optically pumped atomic clocks [6]. As a consequence, in optically pumped gas-cell clocks the clock transition frequency f C exhibits a dispersive shape as function of the pump light laser frequency L , where the amplitude depends linearly on the total light intensity (see Fig.…”

Section: Clock Resonance Cell Propertiesmentioning

confidence: 99%

“…The narrow and precisely controllable emission spectrum of laser diodes guarantees highly efficient optical pumping, and full separation of different effects that limit the clock performance. Laser optical pumping can therefore offer superior short-term clock stabilities 3•10 -13 -1/2 [3,4], as well as high medium and longterm stabilities [5] equalling or surpassing lamp pumping technology when drifts due to thermal or light shift effects are controlled [6,7]. It thus offers the potential to realize improved high-performance gascell clocks while maintaining the advantageous compact design.…”

Section: Introductionmentioning

confidence: 99%

Gas-cell atomic clocks for space: new results and alternative schemes

Affolderbach

Breschi

Schori

et al. 2017

International Conference on Space Optics — ICSO 2006

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We present our development activities on compact Rubidium gas-cell atomic frequency standards, for use in space-borne and ground-based applications. We experimentally demonstrate a high-performance laser optically-pumped Rb clock for space applications such as telecommunications, science missions, and satellite navigation systems (e.g. GALILEO). Using a stabilised laser source and optimized gas cells, we reach clock stabilities as low as 1.5•10-12-1/2 up to 10 3 s and 4•10-14 at 10 4 s. The results demonstrate the feasibility of a laser-pumped Rb clock reaching < 1•10-12-1/2 in a compact device (<2 liters, 2 kg, 20 W), given optimization of the implemented techniques. A second activity concerns more radically miniaturized gas-cell clocks, aiming for low power consumption and a total volume around 1 cm 3 , at the expense of relaxed frequency stability. Here miniaturized "chip-scale" vapour cells and use of coherent laser interrogation techniques are at the heart of the investigations.

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“…One straightforward strategy for accomplishing this goal, presently being pursued by various laboratories, is to engineer the laser system and supporting electronics so as to very tightly lock the laser frequency to an atomic transition. Though some notable success has been achieved with this strategy [6], it is not necessarily optimal for all applications. First of all, if one wants to operate the device as a highly accurate clock, then long term frequency stability from the device is needed.…”

Section: Introductionmentioning

confidence: 98%

Reducing the light-shift in the diode laser pumped rubidium atomic clock

Camparo¹

Proceedings of 1996 IEEE International Frequency Control Symposium

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One impediment to achieving the promise of enhanced laser-pumped gas cell clock performance resides with the light-shift effect, a phenomenon whereby diode laser optical frequency fluctuations are mapped onto the atomic clock's output frequency. The alternative to tightly stabilizing the diode laser in order to overcome this problem is to develop means of reducing the actual magnitude of the light-shift. Here, we briefly review two strategies for accomplishing this, and introduce a new one based on optical pumping with laser-induced-fluorescence (LIF). The advantage of LIF optical pumping is that the clock's output frequency is insensitive to laser frequency fluctuations. Though LIF optical pumping creates a dependence of clock frequency on laser intensity variations, it is to be noted that diode lasers have very low intensity noise. Consequently, with regards to the light-shift effect the LIF strategy takes advantage of an inherent diode laser strength.

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Short-term stability of laser-pumped rubidium gas cell frequency standard

Cited by 16 publications

References 3 publications

Experimental Demonstration of a Compact and High-Performance Laser-Pumped Rubidium Gas Cell Atomic Frequency Standard

Experimental Demonstration of a Compact and High-Performance Laser-Pumped Rubidium Gas Cell Atomic Frequency Standard

Gas-cell atomic clocks for space: new results and alternative schemes

Reducing the light-shift in the diode laser pumped rubidium atomic clock

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