Methods for narrowing the emission line of an injection laser

Belenov, É. M.; Velichanskiǐ, V. L.; Zibrov, A. S.; Никитин, В. В.; Sautenkov, Vladimir A.; Uskov, Alexander V.

doi:10.1070/qe1983v013n06abeh004318

Cited by 44 publications

(12 citation statements)

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“…5 ' 6 The optical field is taken as (1) where 5(t) and OM(t) are the noise-driven amplitude and phase excursions, respectively. The loss is represented by a frequency-dependent photon lifetime Tp,…”

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confidence: 99%

Self-quenching of fundamental phase and amplitude noise in semiconductor lasers with dispersive loss

1990

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We show theoretically that the incorporation of a frequency-dependent loss mechanism in a semiconductor laser can lead, in concert with the amplitude-to-phase coupling, to major reductions of the fundamental intensity and phase noise. A loss dispersion of the wrong sign, on the other hand, leads to an increase of the noise and, at a certain strength, to instability. The optical field is taken aswhere 5(t) and OM(t) are the noise-driven amplitude and phase excursions, respectively. The loss is represented by a frequency-dependent photon lifetime Tp,Tp rpo (2) with rnm the average frequency and xi ( 3 ) and Xr(3) the imaginary and real part of the third-order amplifying medium susceptibility so that a is the amplitude-tophase coupling factor. A formal solution of Eqs. (3) with 6(0) = 0, q(0) = 0 leads toW' WI (1 + Ca), This is the key ensatz. It stipulates that the loss rate where Ai and Ar are, respectively, the real and imaginary parts of the Langevin noise sources representing the spontaneous emission, and (5) (6) (7) where co' is seen to play the role of the fundamental decay rate of the fluctuations. This rate increases for Ca >O. Taking first the case of col'> O we can neglect the decaying terms, i.e., terms with cl'(t -X), in the exponent of Eq. (6) A~k Xr(3)°1---

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Self-quenching of fundamental phase and amplitude noise in semiconductor lasers with dispersive loss

1990

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“…Also the following fundamental issue has caught our attention -can the electronic feedback alters the physical properties of the atomic medium in our method? For example, in the 1980s it was found that the application of electronic feedback can change the essential physical property of a laser diode -its coherence [40][41][42]. If the feedback bandwidth is greater than the frequency spectrum of the dominate spontaneous noise, the linewidth of the diode laser is narrowed.…”

Section: Discussionmentioning

confidence: 99%

Feedback spectroscopy of atomic resonances

et al. 2013

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We propose a non-standard spectroscopic technique that uses a feedback control of the input probe field parameters to significantly increase the contrast and quality factor of the atomic resonances. In particular, to apply this technique for the dark resonances we sustain the fluorescence intensity at a fixed constant level while taking the spectra process. Our method, unlike the conventional spectroscopy, does not require an optically dense medium. Theoretical analysis has been experimentally confirmed in spectroscopy of atomic rubidium vapor in which a considerable increase (one-two order) of the resonance amplitude and a 3-fold decrease of the width have been observed in optically thin medium. As a result, the quality factor of the dark resonance is increased by two orders of magnitude and its contrast reaches a record level of 260%. Different schemes, including magneto-optical Hanle spectroscopy and Doppler-free spectroscopy have also showed a performance enhancement by using the proposed technique.PACS numbers: 07.55. Ge, 32.30.Dx, 32.70.Jz Over time a spectroscopy has established a certain requirement to take a medium's response as a function of frequency of the probing field while the rest of the input parameters (intensity, polarization, spatial distribution, etc.) are kept at a constant level. Usually in this case the registered signals are either the absorption or the fluorescence spectra. Instead, we suggest to hold the medium response at a constant level (during the frequency scanning) by manipulation of the input probing field via electronic feedback control. In this case the changes of the governed input parameters imitate the medium's spectrum. To test our conception we have applied it to a well-known phenomenon -the coherent population trapping (CPT) [1][2][3][4].The main feature of the CPT consists in the existence of so-called dark state |dark , which is a coherent superposition state and nullifies an atomic-light interaction operatorV:V|dark = 0. In the dark state the atoms neither absorb nor emit a light. For the modern laser metrology the importance of CPT lies in the development of miniature (including chip-scale) atomic clocks [5-10] and magnetometers [11][12][13][14][15][16]. These devices are based on a two-photon resonance (for rubidium or cesium atoms, above all) formed in a bichromatic laser field, in which the frequency difference of the spectral components (ω 1 − ω 2 ) is varied near the hyper-fine splitting ∆. For such spectroscopy the existence of a pure coherent state |dark , which is sensitive to the two-photon detuning δ R =(ω 1 − ω 2 − ∆), leads to a significant increase of the contrast and quality factor (amplitude-to-width ratio) of the CPT resonance in combination with a decrease of the its light shift. Namely it explains why for alkali atoms the D 1 line is much preferable in comparison with the D 2 line, for which the pure dark state is absent in the cases of Doppler and/or collisional broadening of optical line [17,18]. Pursuing a higher resonance contrast, the new po...

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“…The hyperfine structure of the P63 R70 (8,4) iodine transition at 689.455 nm was already resolved19, which can provide an accurate frequency marker close to the Sr line.…”

Section: Introductionmentioning

confidence: 99%