The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Peter J. Delfyett - One of the best experts on this subject based on the ideXlab platform.
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an Etalon stabilized 10 ghz comb source using a slab coupled waveguide amplifier
Proceedings of SPIE, 2011Co-Authors: Josue Davilarodriguez, Peter J. Delfyett, Dimitrios Mandridis, Ibrahim Ozdur, Charles Williams, J J Plant, P W JuodawlkisAbstract:An optical comb source based on a slab-coupled optical waveguide amplifier (SCOWA) is presented. The laser is harmonically mode-locked at 10.287 GHz repetition rate and stabilized to an intra-cavity Fabry-Perot Etalon via Pound- Drever-Hall locking. The Fabry-Perot Etalon serves as a reference for the optical frequency of the comb-lines and suppresses the fiber cavity modes to allow only a single longitudinal mode-set to oscillate, generating a frequency comb spaced by the repetition rate. The pulse-to-pulse timing jitter and energy fluctuations are < 2 fs and < 0.03%, respectively (integrated from 1Hz to 100 MHz). Fundamental to this result is the incorporation of the SCOW amplifier as the gain medium and the use of an ultra-low noise sapphire-loaded cavity oscillator to mode-lock the laser. The SCOWA has higher saturation power than commercially available gain media, permitting higher intra-cavity power as well as available power at the output, increasing the power of the photodetected RF tones which increases their signal-to-noise ratio. A high visibility optical frequency comb is observed spanning ~3 nm (at -10 dB), with optical SNR > 60 dB for a cavity with no dispersion compensation. Initial results of a dispersion compensated cavity are presented. A spectral width of ~7.6 nm (-10 dB) was obtained for this case and the pulses can be compressed to near the transform limit at ~930 fs.
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low noise chirped pulse mode locked laser using an intra cavity fabry Perot Etalon
Optics Express, 2011Co-Authors: Dimitrios Mandridis, Ibrahim Ozdur, Charles Williams, Peter J. DelfyettAbstract:This work presents an extensive investigation of the performance characteristics of a semiconductor-based Theta cavity design laser with an intra-cavity Fabry-Perot Etalon operating at 100 MHz repetition rate. The Theta laser being an external cavity harmonically mode-locked semiconductor laser exhibits supermode noise that impairs its performance. A fiberized Fabry-Perot periodic filter inserted within the Theta laser cavity mitigates the contribution of the supermode noise to the pulse-to-pulse energy variance by 20 times. The laser has both a compressed output with picosecond pulse duration and a uniform intensity quasi-CW linearly chirped pulse output with 10 nm bandwidth. Long-term stability is attained by referencing the cavity length to the Etalon using an intra-cavity Hansch-Couillaud locking scheme.
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a semiconductor based frequency stabilized mode locked laser using a phase modulator and an intracavity Etalon
Optics Letters, 2010Co-Authors: Josue Davilarodriguez, Charles Williams, Ibrahim Ozdur, Peter J. DelfyettAbstract:We report a frequency-stabilized semiconductor-based mode-locked laser that uses a phase modulator and an intracavity Fabry-Perot Etalon for both active mode-locking and optical frequency stabilization. A twofold multiplication of the repetition frequency of the laser is inherently obtained in the process. The residual timing jitter of the mode-locked pulse train is 13fs (1Hz to 100MHz), measured after regenerative frequency division of the photodetected pulse train.
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tunable opto electronic oscillator with an intracavity fabry Perot Etalon
Photonics, 2010Co-Authors: Ibrahim Ozdur, Dimitrios Mandridis, Nazanin Hoghooghi, Peter J. DelfyettAbstract:An optically tunable optoelectronic oscillator(OEO) scheme with 1000 finesse intracavity Fabry-Perot Etalon is demonstrated at 10GHz. Optical single side band modulation is implemented and resulted in 10–20dB higher SNR than standard dual side band modulation.
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low noise optically tunable opto electronic oscillator with fabry Perot Etalon
Journal of Lightwave Technology, 2010Co-Authors: Ibrahim Ozdur, Dimitrios Mandridis, Nazanin Hoghooghi, Peter J. DelfyettAbstract:A low noise optically tunable optoelectronic oscillator (OEO) scheme which uses a 1000 finesse Fabry-Perot Etalon as the mode selector is demonstrated. The dependency of input optical frequency on RF frequency is theoretically analyzed and experimentally shown. The Etalon-based OEO is compared with the standard OEO with RF filter and the results show higher RF frequency stability and lower phase noise. A single optical side band modulation technique is also used to improve the spectral purity and the results are compared with the double side band modulation technique. Low noise operation of an optically tunable OEO is achieved by using optical single side band modulation.
Chengkuo Lee - One of the best experts on this subject based on the ideXlab platform.
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polycrystalline silicon based photonic crystal fabry Perot Etalon
International Conference on Optical MEMS and Nanophotonics, 2015Co-Authors: Prakash Pitchappa, Chengkuo LeeAbstract:We demonstrated the design, fabrication and characterization of a polycrystalline silicon based photonic crystal Fabry-Perot Etalon with a filtered transmission centered at 3.51µm. The high quality factor of 520 shows the possibility for high-resolution applications.
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two dimensional photonic crystal based fabry Perot Etalon
Optics Letters, 2015Co-Authors: Prakash Pitchappa, Piotr Kropelnicki, Jian Wang, Hong Cai, Chengkuo LeeAbstract:We demonstrate the design, fabrication, and characterization of a polycrystalline-silicon-based photonic crystal Fabry–Perot Etalon, which is aimed to work in the mid-infrared wavelengths. The highly reflective mirrors required in a Fabry–Perot Etalon are realized by freestanding polycrystalline-silicon-based photonic crystal membranes with etched circular air holes. A peak reflection of 96.4% is observed at 3.60 μm. We propose a monolithic CMOS-compatible fabrication process to configure two such photonic crystal mirrors to be in parallel to form a Fabry–Perot Etalon; a filtered transmission centered at 3.51 μm is observed. The quality factor measured is around 300, which is significantly higher than in existing works. This creates the possibility of using such devices for high-resolution applications such as gas sensing and hyperspectral imaging.
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Polycrystalline silicon based photonic crystal Fabry-Perot Etalon
2015 Opto-Electronics and Communications Conference (OECC), 2015Co-Authors: Chong Pei Ho, Prakash Pitchappa, Chengkuo LeeAbstract:We demonstrated the design, fabrication and characterization of a polycrystalline silicon based photonic crystal Fabry-Perot Etalon that is aimed to work in the mid-infrared wavelengths. The highly reflective mirrors required in a Fabry-Perot Etalon are realized by free-standing polycrystalline silicon based photonic crystal membranes with etched circular air holes. A peak reflection of 96.5% is observed at 3.60μm with very low absorption loss. When two of the photonic crystal mirrors are configured to be in parallel to form a Fabry-Perot Etalon, a filtered transmission centered at 3.51μm is observed. The quality factor measured was around 520 which is significantly higher than existing works. This paves the possibility of using such devices for high-resolution applications such as gas sensing and hyperspectral imaging.
Ibrahim Ozdur - One of the best experts on this subject based on the ideXlab platform.
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an Etalon stabilized 10 ghz comb source using a slab coupled waveguide amplifier
Proceedings of SPIE, 2011Co-Authors: Josue Davilarodriguez, Peter J. Delfyett, Dimitrios Mandridis, Ibrahim Ozdur, Charles Williams, J J Plant, P W JuodawlkisAbstract:An optical comb source based on a slab-coupled optical waveguide amplifier (SCOWA) is presented. The laser is harmonically mode-locked at 10.287 GHz repetition rate and stabilized to an intra-cavity Fabry-Perot Etalon via Pound- Drever-Hall locking. The Fabry-Perot Etalon serves as a reference for the optical frequency of the comb-lines and suppresses the fiber cavity modes to allow only a single longitudinal mode-set to oscillate, generating a frequency comb spaced by the repetition rate. The pulse-to-pulse timing jitter and energy fluctuations are < 2 fs and < 0.03%, respectively (integrated from 1Hz to 100 MHz). Fundamental to this result is the incorporation of the SCOW amplifier as the gain medium and the use of an ultra-low noise sapphire-loaded cavity oscillator to mode-lock the laser. The SCOWA has higher saturation power than commercially available gain media, permitting higher intra-cavity power as well as available power at the output, increasing the power of the photodetected RF tones which increases their signal-to-noise ratio. A high visibility optical frequency comb is observed spanning ~3 nm (at -10 dB), with optical SNR > 60 dB for a cavity with no dispersion compensation. Initial results of a dispersion compensated cavity are presented. A spectral width of ~7.6 nm (-10 dB) was obtained for this case and the pulses can be compressed to near the transform limit at ~930 fs.
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low noise chirped pulse mode locked laser using an intra cavity fabry Perot Etalon
Optics Express, 2011Co-Authors: Dimitrios Mandridis, Ibrahim Ozdur, Charles Williams, Peter J. DelfyettAbstract:This work presents an extensive investigation of the performance characteristics of a semiconductor-based Theta cavity design laser with an intra-cavity Fabry-Perot Etalon operating at 100 MHz repetition rate. The Theta laser being an external cavity harmonically mode-locked semiconductor laser exhibits supermode noise that impairs its performance. A fiberized Fabry-Perot periodic filter inserted within the Theta laser cavity mitigates the contribution of the supermode noise to the pulse-to-pulse energy variance by 20 times. The laser has both a compressed output with picosecond pulse duration and a uniform intensity quasi-CW linearly chirped pulse output with 10 nm bandwidth. Long-term stability is attained by referencing the cavity length to the Etalon using an intra-cavity Hansch-Couillaud locking scheme.
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a semiconductor based frequency stabilized mode locked laser using a phase modulator and an intracavity Etalon
Optics Letters, 2010Co-Authors: Josue Davilarodriguez, Charles Williams, Ibrahim Ozdur, Peter J. DelfyettAbstract:We report a frequency-stabilized semiconductor-based mode-locked laser that uses a phase modulator and an intracavity Fabry-Perot Etalon for both active mode-locking and optical frequency stabilization. A twofold multiplication of the repetition frequency of the laser is inherently obtained in the process. The residual timing jitter of the mode-locked pulse train is 13fs (1Hz to 100MHz), measured after regenerative frequency division of the photodetected pulse train.
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tunable opto electronic oscillator with an intracavity fabry Perot Etalon
Photonics, 2010Co-Authors: Ibrahim Ozdur, Dimitrios Mandridis, Nazanin Hoghooghi, Peter J. DelfyettAbstract:An optically tunable optoelectronic oscillator(OEO) scheme with 1000 finesse intracavity Fabry-Perot Etalon is demonstrated at 10GHz. Optical single side band modulation is implemented and resulted in 10–20dB higher SNR than standard dual side band modulation.
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low noise optically tunable opto electronic oscillator with fabry Perot Etalon
Journal of Lightwave Technology, 2010Co-Authors: Ibrahim Ozdur, Dimitrios Mandridis, Nazanin Hoghooghi, Peter J. DelfyettAbstract:A low noise optically tunable optoelectronic oscillator (OEO) scheme which uses a 1000 finesse Fabry-Perot Etalon as the mode selector is demonstrated. The dependency of input optical frequency on RF frequency is theoretically analyzed and experimentally shown. The Etalon-based OEO is compared with the standard OEO with RF filter and the results show higher RF frequency stability and lower phase noise. A single optical side band modulation technique is also used to improve the spectral purity and the results are compared with the double side band modulation technique. Low noise operation of an optically tunable OEO is achieved by using optical single side band modulation.
Prakash Pitchappa - One of the best experts on this subject based on the ideXlab platform.
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polycrystalline silicon based photonic crystal fabry Perot Etalon
International Conference on Optical MEMS and Nanophotonics, 2015Co-Authors: Prakash Pitchappa, Chengkuo LeeAbstract:We demonstrated the design, fabrication and characterization of a polycrystalline silicon based photonic crystal Fabry-Perot Etalon with a filtered transmission centered at 3.51µm. The high quality factor of 520 shows the possibility for high-resolution applications.
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two dimensional photonic crystal based fabry Perot Etalon
Optics Letters, 2015Co-Authors: Prakash Pitchappa, Piotr Kropelnicki, Jian Wang, Hong Cai, Chengkuo LeeAbstract:We demonstrate the design, fabrication, and characterization of a polycrystalline-silicon-based photonic crystal Fabry–Perot Etalon, which is aimed to work in the mid-infrared wavelengths. The highly reflective mirrors required in a Fabry–Perot Etalon are realized by freestanding polycrystalline-silicon-based photonic crystal membranes with etched circular air holes. A peak reflection of 96.4% is observed at 3.60 μm. We propose a monolithic CMOS-compatible fabrication process to configure two such photonic crystal mirrors to be in parallel to form a Fabry–Perot Etalon; a filtered transmission centered at 3.51 μm is observed. The quality factor measured is around 300, which is significantly higher than in existing works. This creates the possibility of using such devices for high-resolution applications such as gas sensing and hyperspectral imaging.
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Polycrystalline silicon based photonic crystal Fabry-Perot Etalon
2015 Opto-Electronics and Communications Conference (OECC), 2015Co-Authors: Chong Pei Ho, Prakash Pitchappa, Chengkuo LeeAbstract:We demonstrated the design, fabrication and characterization of a polycrystalline silicon based photonic crystal Fabry-Perot Etalon that is aimed to work in the mid-infrared wavelengths. The highly reflective mirrors required in a Fabry-Perot Etalon are realized by free-standing polycrystalline silicon based photonic crystal membranes with etched circular air holes. A peak reflection of 96.5% is observed at 3.60μm with very low absorption loss. When two of the photonic crystal mirrors are configured to be in parallel to form a Fabry-Perot Etalon, a filtered transmission centered at 3.51μm is observed. The quality factor measured was around 520 which is significantly higher than existing works. This paves the possibility of using such devices for high-resolution applications such as gas sensing and hyperspectral imaging.
David J. Brady - One of the best experts on this subject based on the ideXlab platform.
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very high resolution tandem fabry Perot Etalon cylindrical beam volume hologram spectrometer for diffuse source spectroscopy
Optics Letters, 2008Co-Authors: Majid Badieirostami, Omid Momtahan, Chao Ray Hsieh, Ali Adibi, David J. BradyAbstract:We demonstrate a compact and slitless spectrometer with high resolution formed by cascading a Fabry-Perot Etalon (FPE) and a cylindrical beam volume hologram (CBVH). The most significant advantage of this combined spectrometer is that we can independently encode spectral information of a diffuse beam in a 2D plane. Also, we show that in this slitless configuration we can simultaneously benefit from the advantages of both elements: the high resolution of the FPE and the large spectral range of the CBVH. Here, we report on the experimental demonstration of a spectrometer with better than 0.2 nm resolution.
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an ultra high resolution tandem fabry Perot Etalon cylindrical beam volume hologram spectrometer
Adaptive Optics: Analysis and Methods Computational Optical Sensing and Imaging Information Photonics Signal Recovery and Synthesis Topical Meetings o, 2007Co-Authors: Majid Badieirostami, Omid Momtahan, Chao Ray Hsieh, Ali Adibi, Ali A Eftekhar, David J. BradyAbstract:We have designed a compact spectrometer by cascading a simple Fabry-Perot Etalon and a cylindrical beam volume hologram. This spectrometer results in a two-dimensional spatial-spectral mapping in the output plane with ultra-high resolution.
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An Ultra-High Resolution Spectrometer with Successive Combination of a Fabry-Perot Etalon and a Cylindrical Beam Volume Hologram
2007 Conference on Lasers and Electro-Optics (CLEO), 2007Co-Authors: Majid Badieirostami, Omid Momtahan, Chao Ray Hsieh, Ali Adibi, David J. BradyAbstract:We have designed a compact spectrometer by cascading a simple Fabry-Perot Etalon and a cylindrical beam volume hologram. The combination of these two elements results in a two-dimensional spatial-spectral mapping in the output plane. Using this spectrometer, ultra-high resolution (better than 0.2 nm) over a large bandwidth (larger than 300 nm) has been experimentally demonstrated for diffuse light sources.