Generalized Spectral Magnitude and Phase Retrieval Algorithm for Self-Referenced Multiheterodyne Detection

Klee, Anthony; Davila-Rodriguez, Josue; Williams, Charles; Delfyett, Peter J.

doi:10.1109/jlt.2013.2286267

Cited by 7 publications

(3 citation statements)

References 18 publications

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“…Because the probe comb consisted of only a few hundred comb teeth, a digital lock-in algorithm [35] instead of the usual fast Fourier transform [19] was used to retrieve both the amplitude and phase of all down-converted comb teeth from the time-domain interferograms [20,21]. Challenges in discrete time-domain sampling like the scalloping of down-converted comb teeth [36] are avoided entirely owing to the frequency-agile, digital control of f mod , Δf mod , and f AOM . Fig.…”

Section: Long-term Coherence Without Complexitymentioning

confidence: 99%

Coherent cavity-enhanced dual-comb spectroscopy

Fleisher¹,

Long²,

Reed³

et al. 2016

Opt. Express

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Dual-comb spectroscopy allows for the rapid, multiplexed acquisition of high-resolution spectra without the need for moving parts or low-resolution dispersive optics. This method of broadband spectroscopy is most often accomplished via tight phase locking of two mode-locked lasers or via sophisticated signal processing algorithms, and therefore, long integration times of phase coherent signals are difficult to achieve. Here we demonstrate an alternative approach to dual-comb spectroscopy using two phase modulator combs originating from a single continuous-wave laser capable of > 2 hours of coherent real-time averaging. The dual combs were generated by driving the phase modulators with step-recovery diodes where each comb consisted of > 250 teeth with 203 MHz spacing and spanned > 50 GHz region in the near-infrared. The step-recovery diodes are passive devices that provide low-phase-noise harmonics for efficient coupling into an enhancement cavity at picowatt optical powers. With this approach, we demonstrate the sensitivity to simultaneously monitor ambient levels of CO2, CO, HDO, and H2O in a single spectral region at a maximum acquisition rate of 150 kHz. Robust, compact, low-cost and widely tunable dual-comb systems could enable a network of distributed multiplexed optical sensors.

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Section: Long-term Coherence Without Complexitymentioning

confidence: 99%

Coherent cavity-enhanced dual-comb spectroscopy

Fleisher¹,

Long²,

Reed³

et al. 2016

Opt. Express

View full text Add to dashboard Cite

show abstract

“…Multiheterodyne techniques are linear, applicable to OAW with large mode spacing, and can work with reduced RF bandwidth. However, they need reference combs with different mode spacings and controllable carrier-envelope-offset frequencies [17].In this Letter, we report on what is, to our best knowledge, the first self-referenced OAW measurement experiment using an orthogonally probed DQ-SSI system implemented by a polarization line-by-line pulse shaper. We know that a (scalar) pulse shaper has been applied to a variety of pulse measurement techniques [9,[18][19][20] with the advantages of eliminating extra dispersion due to typical interferometer setup, simultaneous measurement and shaping, improved precision of system calibration, and ultrahigh sensitivity.…”

mentioning

confidence: 98%

mentioning

confidence: 99%