Line shapes of near-infrared DFB and VCSEL diode lasers under the influence of system back reflections

Engelbrecht, Rainer; Lins, B.; Zinn, P.; Buchtal, R.; Schmauß, Bernhard

doi:10.1007/s00340-012-5097-3

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…The addition of a 30 MHz, low-pass filter to configuration C led to no appreciable reduction in the magnitude of the Gaussian broadening of the laser linewidth (E). These results are in good agreement with previous studies on the lineshape of VCSELs, according to which the Gaussian contribution to the lineshape arises from efficient translation of carrier density fluctuations into 1/ f frequency noise, due to their high current-tuning coefficient of the optical frequency [20,21]. Conversely, the Lorentzian component appeared to be invariant under the presence of external current perturbation.…”

Section: Experiments and Resultssupporting

confidence: 92%

RF noise induced laser perturbation for improving the performance of non-resonant cavity enhanced absorption spectroscopy

et al. 2014

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We present a novel strategy for suppressing mode structure which often degrades off-axis cavity enhanced absorption spectra. This strategy relies on promoting small, random fluctuations in the optical frequency by perturbing the injection current of the diode laser source with radio frequency (RF) bandwidth-limited white noise. A fast and compact oxygen sensor, constructed from a 764 nm vertical-cavity surface-emitting laser (VCSEL) and an optical cavity with re-entrant configuration, is employed to demonstrate the potential of this scheme for improving the sensitivity and robustness of a field-deployable cavity spectrometer. The RF spectral density of the current noise injected into the VCSEL has been measured, and correlated to the effects on the optical spectral signal-to-noise ratio (SNR) and laser linewidth for a range of re-entrant geometries. A fourfold gain in the SNR has been achieved using the RF noise perturbation for the optimal off-axis alignment, which led to a minimum detectable absorption (MDA) predicted from an Allan variance study as low as 4.3 × 10(-5) at 1 s averaging. For the optically forbidden oxygen transition under investigation, a limit of detection (SNR = 1) of 810 ppm was achieved for a 10 ms acquisition time. This performance level paves the way for a fast, sensitive, in-line oxygen spectrometer that lends itself to a range of applications in respiratory medicine.

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Section: Experiments and Resultssupporting

confidence: 92%

RF noise induced laser perturbation for improving the performance of non-resonant cavity enhanced absorption spectroscopy

et al. 2014

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“…5). This constitutes a narrowing by almost 4 orders of magnitude starting from a free-running DFB laser with a linewidth of 2 MHz and nearly ideal white frequency noise [13].…”

mentioning

confidence: 99%

Optical feedback stabilized laser tuned by single-sideband modulation

2013

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We report a subkilohertz-linewidth distributed-feedback diode laser that is optical-feedback locked to a highly stable V-shaped cavity with drift rates below 20 Hz/s. This source is continuously tunable over 1 THz around 1590 nm by selecting a cavity mode and using an innovative single-sideband modulation scheme, which allows for frequency shifting over up to 40 GHz with millihertz accuracy. This robust setup achieves high performance without advanced vibration isolation and will be a powerful tool for metrological applications, in particular a redetermination of the Boltzmann constant by molecular spectroscopy.

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“…In the double-pass system, light field shifts may possibly be larger, as well as the field intensity is higher. Secondly, it is possible that the reflected beam could lead to fluctuations in the radiation parameters when entering the laser [10]. This is why in the future, we are planning to use an optical isolator so that this effect may be ruled out.…”

Section: Resultsmentioning

confidence: 99%

Atomic clock on the basis of the CPT effect in counter-propagating circularly polarised waves

Radnatarov,

Kobtsev,

Gromov

et al. 2023

Quantum and Nonlinear Optics X

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This study explores a Rb CPT atomic clock using two counter-propagating waves with orthogonal circular polarisation. By suppressing the optical pumping effect, the clock demonstrates substantial (several times) improvement in CPT contrast compared to the conventional single circularly polarised wave configuration. The use of two counter-propagating beams also allows for positive interference between two photon transitions excited by anti-parallel waves. A double-pass optical layout improves short-term stability by 1.5 times, achieving a result of 4.5×10–11 over 1 second using a 5-mm long optical cell.

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Line shapes of near-infrared DFB and VCSEL diode lasers under the influence of system back reflections

Cited by 7 publications

References 34 publications

RF noise induced laser perturbation for improving the performance of non-resonant cavity enhanced absorption spectroscopy

RF noise induced laser perturbation for improving the performance of non-resonant cavity enhanced absorption spectroscopy

Optical feedback stabilized laser tuned by single-sideband modulation

Atomic clock on the basis of the CPT effect in counter-propagating circularly polarised waves

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