The optical feedback spatial phase driving perturbations of DFB laser diodes in an optical clock

Schmeissner, Roman; Bandel, N. von; Douahi, A.; Parillaud, O.; Garcia, Michel; Krakowski, M.; Baldy, M.

doi:10.1109/eftf.2016.7477844

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…It is worth to note that the DFB laser diode we used, with a linewidth of about 2 MHz, is sensitive even to the lowest levels of back-reflections [34], e.g., the coated collimated lens may introduce some intensity and frequency noise at the regime of 0.1 kHz to 10 kHz. Finding the correct lens alignment to minimize the reflection induced noise while keeping a well-collimated laser beam was not an easy task.…”

Section: B Fiber Eopm Sidebands Generationmentioning

confidence: 99%

High-Performance Coherent Population Trapping Clock with Polarization Modulation

et al. 2017

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We demonstrate a vapor cell atomic clock prototype based on continuous-wave (CW) interrogation and double-modulation coherent population trapping (DM-CPT) technique. The DM-CPT technique uses a synchronous modulation of polarization and relative phase of a bi-chromatic laser beam in order to increase the number of atoms trapped in a dark state, i.e. a non-absorbing state. The narrow resonance, observed in transmission of a Cs vapor cell, is used as a narrow frequency discriminator in an atomic clock. A detailed characterization of the CPT resonance versus numerous parameters is reported. A short-term frequency stability of 3.2 × 10 −13 τ −1/2 up to 100 s averaging time is measured. These performances are more than one order of magnitude better than industrial Rb clocks and comparable to those of best laboratory-prototype vapor cell clocks. The noise budget analysis shows that the short and mid-term frequency stability is mainly limited by the power fluctuations of the microwave used to generate the bi-chromatic laser. These preliminary results demonstrate that the DM-CPT technique is well-suited for the development of a high-performance atomic clock, with potential compact and robust setup due to its linear architecture. This clock could find future applications in industry, telecommunications, instrumentation or global navigation satellite systems.

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Section: B Fiber Eopm Sidebands Generationmentioning

confidence: 99%

High-Performance Coherent Population Trapping Clock with Polarization Modulation

et al. 2017

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“…Techniques to determine quantitatively the sensitivity to optical feedback with high degree of precision have been demonstrated. A comparable, very low level of feedback sensitivity (FPR ≈ -70 dB) for the same DFB lasers (provided by III-V Lab) has also been reported in [15] when characterizing the frequency shift of the laser diode due to feedback, by using the out-of-feedback bandwidth error signal of the laser diode frequency lock. …”

Section: Discussionmentioning

confidence: 99%

Methods and setup for spectral characterization of laser diodes for atomic clocks

Gruet

Matthey

Affolderbach

et al. 2017

International Conference on Space Optics — ICSO 2016

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“…The current design does not contain an optical isolator. To avoid perturbation direct back-reflection into the DFB lasers [4], all optical elements are implemented under a slight angle against the optical axis. A partially representative prototype has been validated through a clock stability measurement [3].…”

Section: The Laser and Optics Sub-systemmentioning

confidence: 99%

Engineering model of the optical space CS clock

Schmeissner

Favard

Dufreche

et al. 2017

International Conference on Space Optics — ICSO 2016

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The optical feedback spatial phase driving perturbations of DFB laser diodes in an optical clock

Cited by 4 publications

References 5 publications

High-Performance Coherent Population Trapping Clock with Polarization Modulation

High-Performance Coherent Population Trapping Clock with Polarization Modulation

Methods and setup for spectral characterization of laser diodes for atomic clocks

Engineering model of the optical space CS clock

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