The Experts below are selected from a list of 9507 Experts worldwide ranked by ideXlab platform
Andrew M Weiner - One of the best experts on this subject based on the ideXlab platform.
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bandwidth scaling and spectral flatness enhancement of optical frequency combs from phase modulated Continuous Wave Lasers using cascaded four Wave mixing
Optics Letters, 2012Co-Authors: V R Supradeepa, Andrew M WeinerAbstract:We introduce a new cascaded four-Wave mixing technique that scales up the bandwidth of frequency combs generated by phase modulation of a Continuous-Wave (CW) laser while simultaneously enhancing the spectral flatness. As a result, we demonstrate a 10 GHz frequency comb with over 100 lines in a 10 dB bandwidth in which a record 75 lines are within a flatness of 1 dB. The cascaded four-Wave mixing process increases the bandwidth of the initial comb generated by the modulation of a CW laser by a factor of five. The broadband comb has approximately quadratic spectral phase, which is compensated upon propagation in single-mode fiber, resulting in a 10 GHz train of 940 fs pulses.
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bandwidth scaling and spectral flatness enhancement of optical frequency combs from phase modulated Continuous Wave Lasers using cascaded four Wave mixing
arXiv: Optics, 2010Co-Authors: V R Supradeepa, Andrew M WeinerAbstract:We introduce a new cascaded four-Wave mixing technique which scales up the bandwidth of frequency combs generated by phase modulation of a Continuous Wave laser while simultaneously enhancing the spectral flatness. As a result we demonstrate a 10 GHz frequency comb with over 100 lines in a 10-dB bandwidth in which a record 75 lines are within a flatness of 1-dB. The cascaded four-Wave mixing process increases the bandwidth of the initial comb generated by modulation of a CW laser by a factor of five. The broadband comb has approximately quadratic spectral phase, which is compensated upon propagation in single mode fiber, resulting in a 10 GHz train of 940 fs pulses
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generation of very flat optical frequency combs from Continuous Wave Lasers using cascaded intensity and phase modulators driven by tailored radio frequency Waveforms
Optics Letters, 2010Co-Authors: Rui Wu, Daniel E Leaird, V R Supradeepa, Christopher M Long, Andrew M WeinerAbstract:We demonstrate a scheme based on a cascade of lithium niobate intensity and phase modulators driven by specially tailored RF Waveforms to generate an optical frequency comb with very high spectral flatness. In this Letter, we demonstrate a 10GHz comb with 38 comb lines within a spectral power variation below 1dB. The number of comb lines that can be generated is limited by the power handling capability of the phase modulator, and this can be scaled without compromising the spectral flatness. Furthermore, the spectral phase of the generated combs in our scheme is almost purely quadratic, which, as we will demonstrate, allows for high-quality pulse compression using only single-mode fiber.
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generation of very flat optical frequency combs from Continuous Wave Lasers using cascaded intensity and phase modulators driven by tailored radio frequency Waveforms
arXiv: Optics, 2010Co-Authors: V R Supradeepa, Daniel E Leaird, Christopher M Long, Andrew M WeinerAbstract:We demonstrate a scheme, based on a cascade of lithium niobate intensity and phase modulators driven by specially tailored radio frequency Waveforms to generate an optical frequency comb with very high spectral flatness. In this work we demonstrate a 10 GHz comb with ~40 lines with spectral power variation below 1-dB and ~60 lines in total. The number of lines that can be generated is limited by the power handling capability of the phase modulator, and this can be scaled without compromising the spectral flatness. Furthermore, the spectral phase of the generated combs in our scheme is almost purely quadratic which, as we will demonstrate, allows for very high quality pulse compression using only single mode fiber.
V R Supradeepa - One of the best experts on this subject based on the ideXlab platform.
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bandwidth scaling and spectral flatness enhancement of optical frequency combs from phase modulated Continuous Wave Lasers using cascaded four Wave mixing
Optics Letters, 2012Co-Authors: V R Supradeepa, Andrew M WeinerAbstract:We introduce a new cascaded four-Wave mixing technique that scales up the bandwidth of frequency combs generated by phase modulation of a Continuous-Wave (CW) laser while simultaneously enhancing the spectral flatness. As a result, we demonstrate a 10 GHz frequency comb with over 100 lines in a 10 dB bandwidth in which a record 75 lines are within a flatness of 1 dB. The cascaded four-Wave mixing process increases the bandwidth of the initial comb generated by the modulation of a CW laser by a factor of five. The broadband comb has approximately quadratic spectral phase, which is compensated upon propagation in single-mode fiber, resulting in a 10 GHz train of 940 fs pulses.
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bandwidth scaling and spectral flatness enhancement of optical frequency combs from phase modulated Continuous Wave Lasers using cascaded four Wave mixing
arXiv: Optics, 2010Co-Authors: V R Supradeepa, Andrew M WeinerAbstract:We introduce a new cascaded four-Wave mixing technique which scales up the bandwidth of frequency combs generated by phase modulation of a Continuous Wave laser while simultaneously enhancing the spectral flatness. As a result we demonstrate a 10 GHz frequency comb with over 100 lines in a 10-dB bandwidth in which a record 75 lines are within a flatness of 1-dB. The cascaded four-Wave mixing process increases the bandwidth of the initial comb generated by modulation of a CW laser by a factor of five. The broadband comb has approximately quadratic spectral phase, which is compensated upon propagation in single mode fiber, resulting in a 10 GHz train of 940 fs pulses
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generation of very flat optical frequency combs from Continuous Wave Lasers using cascaded intensity and phase modulators driven by tailored radio frequency Waveforms
Optics Letters, 2010Co-Authors: Rui Wu, Daniel E Leaird, V R Supradeepa, Christopher M Long, Andrew M WeinerAbstract:We demonstrate a scheme based on a cascade of lithium niobate intensity and phase modulators driven by specially tailored RF Waveforms to generate an optical frequency comb with very high spectral flatness. In this Letter, we demonstrate a 10GHz comb with 38 comb lines within a spectral power variation below 1dB. The number of comb lines that can be generated is limited by the power handling capability of the phase modulator, and this can be scaled without compromising the spectral flatness. Furthermore, the spectral phase of the generated combs in our scheme is almost purely quadratic, which, as we will demonstrate, allows for high-quality pulse compression using only single-mode fiber.
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generation of very flat optical frequency combs from Continuous Wave Lasers using cascaded intensity and phase modulators driven by tailored radio frequency Waveforms
arXiv: Optics, 2010Co-Authors: V R Supradeepa, Daniel E Leaird, Christopher M Long, Andrew M WeinerAbstract:We demonstrate a scheme, based on a cascade of lithium niobate intensity and phase modulators driven by specially tailored radio frequency Waveforms to generate an optical frequency comb with very high spectral flatness. In this work we demonstrate a 10 GHz comb with ~40 lines with spectral power variation below 1-dB and ~60 lines in total. The number of lines that can be generated is limited by the power handling capability of the phase modulator, and this can be scaled without compromising the spectral flatness. Furthermore, the spectral phase of the generated combs in our scheme is almost purely quadratic which, as we will demonstrate, allows for very high quality pulse compression using only single mode fiber.
L P Barry - One of the best experts on this subject based on the ideXlab platform.
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numerical investigation into the injection locking phenomena of gain switched Lasers for optical frequency comb generation
Applied Physics Letters, 2015Co-Authors: Sean P O Duill, Prince M Anandarajah, Rui Zhou, L P BarryAbstract:We present detailed numerical simulations of the laser dynamics that describe optical frequency comb formation by injection-locking a gain-switched laser. The typical rate equations for semiconductor Lasers including stochastic carrier recombination and spontaneous emission suffice to show the injection-locking behavior of gain switched Lasers, and we show how the optical frequency comb evolves starting from the free-running state, right through the final injection-locked state. Unlike the locking of Continuous Wave Lasers, we show that the locking range for gain switched Lasers is considerably greater because injection locking can be achieved by injecting at frequencies close to one of the comb lines. The quality of the comb lines is formally assessed by calculating the frequency modulation (FM)-noise spectral density and we show that under injection-locking conditions the FM-noise spectral density of the comb lines tend to that of the maser laser.
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numerical investigation into the injection locking phenomena of gain switched Lasers for optical frequency comb generation
arXiv: Optics, 2015Co-Authors: Sean P O Duill, Prince M Anandarajah, Rui Zhou, L P BarryAbstract:We present detailed numerical simulations of the laser dynamics that describe optical frequency comb formation by injection-locking a gain-switched laser. The typical rate equations for semiconductor Lasers including stochastic carrier recombination and spontaneous emission suffice to show the injection-locking behavior of gain switched Lasers, and we show how the optical frequency comb evolves starting from the free-running state, right through the final injection- locked state. Unlike the locking of Continuous Wave Lasers, we show that the locking range for gain switched Lasers is considerably greater because injection locking can be achieved by injecting at frequencies close to one of the comb lines. The quality of the comb lines are formally assessed by calculating the FM-noise spectral density and we show that under injection-locking conditions the FM-noise spectral density of the comb lines tend to that of the maser laser.
Aleksandra Foltynowicz - One of the best experts on this subject based on the ideXlab platform.
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optical frequency comb photoacoustic spectroscopy
Physical Chemistry Chemical Physics, 2018Co-Authors: Ibrahim Sadiek, Tommi Mikkonen, Markku Vainio, Juha Toivonen, Aleksandra FoltynowiczAbstract:We report the first photoacoustic detection scheme using an optical frequency comb-optical frequency comb photoacoustic spectroscopy (OFC-PAS). OFC-PAS combines the broad spectral coverage and the high resolution of OFCs with the small sample volume of cantilever-enhanced PA detection. In OFC-PAS, a Fourier transform spectrometer (FTS) is used to modulate the intensity of the exciting comb source at a frequency determined by its scanning speed. One of the FTS outputs is directed to the PA cell and the other is measured simultaneously with a photodiode and used to normalize the PA signal. The cantilever-enhanced PA detector operates in a non-resonant mode, enabling detection of a broadband frequency response. The broadband and the high-resolution capabilities of OFC-PAS are demonstrated by measuring the rovibrational spectra of the fundamental C-H stretch band of CH4, with no instrumental line shape distortions, at total pressures of 1000 mbar, 650 mbar, and 400 mbar. In this first demonstration, a spectral resolution two orders of magnitude better than previously reported with broadband PAS is obtained, limited by the pressure broadening. A limit of detection of 0.8 ppm of methane in N2 is accomplished in a single interferogram measurement (200 s measurement time, 1000 MHz spectral resolution, 1000 mbar total pressure) for an exciting power spectral density of 42 μW/cm-1. A normalized noise equivalent absorption of 8 × 10-10 W cm-1 Hz-1/2 is obtained, which is only a factor of three higher than the best reported with PAS based on Continuous Wave Lasers. A wide dynamic range of up to four orders of magnitude and a very good linearity (limited by the Beer-Lambert law) over two orders of magnitude are realized. OFC-PAS extends the capability of optical sensors for multispecies trace gas analysis in small sample volumes with high resolution and selectivity.
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optical frequency comb photoacoustic spectroscopy
arXiv: Optics, 2018Co-Authors: Ibrahim Sadiek, Tommi Mikkonen, Markku Vainio, Juha Toivonen, Aleksandra FoltynowiczAbstract:We report the first photoacoustic detection scheme using an optical frequency comb - the optical frequency comb photoacoustic spectroscopy (OFC-PAS). OFC-PAS combines the broad spectral coverage and the high resolution of OFCs with the small sample volume of cantilever-enhanced PA detection. In OFC-PAS, a Fourier transform spectrometer (FTS) is used to modulate the intensity of the exciting comb source at a frequency determined by its scanning speed. One of the FTS outputs is directed to the PA cell and the other is measured simultaneously with a photodiode and used to normalize the PA signal. The cantilever-enhanced PA detector operates in a non-resonant mode, enabling detection of broadband frequency response. The broadband and the high-resolution capabilities of OFC-PAS are demonstrated by measuring the rovibrational spectra of the fundamental C-H stretch band of CH${_4}$, with no instrumental line shape distortions, at total pressures of 1000 mbar, 650 mbar, and 400 mbar. In this first demonstration, a spectral resolution two orders of magnitude higher than previously reported with broadband PAS is obtained, limited by the pressure broadening. A limit of detection of 0.8 ppm of methane in N${_2}$ is accomplished in a single interferogram measurement (200 s measurement time, 1000 MHz resolution, 1000 mbar total pressure) for an exciting power spectral density of 42 {\mu}W/cm${^{-1}}$. A normalized noise equivalent absorption of 8x10${^{-10}}$ W cm${^{-1}}$ Hz${^{-1/2}}$ is obtained, which is only a factor of three higher than the best reported with PAS based on Continuous Wave Lasers. A wide dynamic range of up to four orders of magnitude and a very good linearity (limited by the Beer-Lambert law) over two orders of magnitude are realized. OFC-PAS extends the capability of optical sensors for multispecies trace gas analysis in small sample volume with high resolution and selectivity.
Markku Vainio - One of the best experts on this subject based on the ideXlab platform.
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optical frequency comb photoacoustic spectroscopy
Physical Chemistry Chemical Physics, 2018Co-Authors: Ibrahim Sadiek, Tommi Mikkonen, Markku Vainio, Juha Toivonen, Aleksandra FoltynowiczAbstract:We report the first photoacoustic detection scheme using an optical frequency comb-optical frequency comb photoacoustic spectroscopy (OFC-PAS). OFC-PAS combines the broad spectral coverage and the high resolution of OFCs with the small sample volume of cantilever-enhanced PA detection. In OFC-PAS, a Fourier transform spectrometer (FTS) is used to modulate the intensity of the exciting comb source at a frequency determined by its scanning speed. One of the FTS outputs is directed to the PA cell and the other is measured simultaneously with a photodiode and used to normalize the PA signal. The cantilever-enhanced PA detector operates in a non-resonant mode, enabling detection of a broadband frequency response. The broadband and the high-resolution capabilities of OFC-PAS are demonstrated by measuring the rovibrational spectra of the fundamental C-H stretch band of CH4, with no instrumental line shape distortions, at total pressures of 1000 mbar, 650 mbar, and 400 mbar. In this first demonstration, a spectral resolution two orders of magnitude better than previously reported with broadband PAS is obtained, limited by the pressure broadening. A limit of detection of 0.8 ppm of methane in N2 is accomplished in a single interferogram measurement (200 s measurement time, 1000 MHz spectral resolution, 1000 mbar total pressure) for an exciting power spectral density of 42 μW/cm-1. A normalized noise equivalent absorption of 8 × 10-10 W cm-1 Hz-1/2 is obtained, which is only a factor of three higher than the best reported with PAS based on Continuous Wave Lasers. A wide dynamic range of up to four orders of magnitude and a very good linearity (limited by the Beer-Lambert law) over two orders of magnitude are realized. OFC-PAS extends the capability of optical sensors for multispecies trace gas analysis in small sample volumes with high resolution and selectivity.
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optical frequency comb photoacoustic spectroscopy
arXiv: Optics, 2018Co-Authors: Ibrahim Sadiek, Tommi Mikkonen, Markku Vainio, Juha Toivonen, Aleksandra FoltynowiczAbstract:We report the first photoacoustic detection scheme using an optical frequency comb - the optical frequency comb photoacoustic spectroscopy (OFC-PAS). OFC-PAS combines the broad spectral coverage and the high resolution of OFCs with the small sample volume of cantilever-enhanced PA detection. In OFC-PAS, a Fourier transform spectrometer (FTS) is used to modulate the intensity of the exciting comb source at a frequency determined by its scanning speed. One of the FTS outputs is directed to the PA cell and the other is measured simultaneously with a photodiode and used to normalize the PA signal. The cantilever-enhanced PA detector operates in a non-resonant mode, enabling detection of broadband frequency response. The broadband and the high-resolution capabilities of OFC-PAS are demonstrated by measuring the rovibrational spectra of the fundamental C-H stretch band of CH${_4}$, with no instrumental line shape distortions, at total pressures of 1000 mbar, 650 mbar, and 400 mbar. In this first demonstration, a spectral resolution two orders of magnitude higher than previously reported with broadband PAS is obtained, limited by the pressure broadening. A limit of detection of 0.8 ppm of methane in N${_2}$ is accomplished in a single interferogram measurement (200 s measurement time, 1000 MHz resolution, 1000 mbar total pressure) for an exciting power spectral density of 42 {\mu}W/cm${^{-1}}$. A normalized noise equivalent absorption of 8x10${^{-10}}$ W cm${^{-1}}$ Hz${^{-1/2}}$ is obtained, which is only a factor of three higher than the best reported with PAS based on Continuous Wave Lasers. A wide dynamic range of up to four orders of magnitude and a very good linearity (limited by the Beer-Lambert law) over two orders of magnitude are realized. OFC-PAS extends the capability of optical sensors for multispecies trace gas analysis in small sample volume with high resolution and selectivity.