Download or read book Fiber Optical Parametric Amplifiers Oscillators and Related Devices written by Michel E. Marhic and published by Cambridge University Press. This book was released on 2008 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 2007 book comprehensively covers the theory, techniques and practice of all types of fiber OPAs and related devices.
Download or read book High Conversion Efficiency Fiber Optical Parametric Oscillators written by Ka Fai Mak and published by . This book was released on 2010 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The power dynamics in a fiber optic parametric oscillator (FOPO) have been investigated theoretically and experimentally. We studied two different ways to improve the pump-depletion of a FOPO beyond the 58% limit posed by pure parametric theory. Firstly, the effect of stimulated Raman scattering was utilised to achieve pump-depletion of up to 80% at detunings out to 15THz, translating to Watt-level average sideband power. We then investigated the enhancement of pump-depletion by concatenating fibers of different despersions, where we observed modest increase in pump-depletion when compared to the single-fiber case. This novel technique can be applied to FOPOs based on other types of optical fibers, and the ability to further increase the conversion efficiency in FOPOs will make them even more attractive as a new source of coherent radiation"--Abstract.
Download or read book Fiber Optical Parametric Oscillators written by Kwan Leung Gordon Wong and published by . This book was released on 2008 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fiber Optical Parametric Oscillators written by Yiqing Xu and published by . This book was released on 2009 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fiber Optical Parametric Generation of Widely Tunable Source written by Yue Zhou and published by Open Dissertation Press. This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Fiber Optical Parametric Generation of Widely Tunable Source: Continuous-wave to Sub-pricosecond Regime" by Yue, Zhou, 周月, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Optical source generation has attracted significant attention recently, especially in fiber optical communications. Today there is a growing a demand for optical source generation beyond conventional telecommunication wavelength bands. However, high quality and versatile optical source is generally not available over those wavelength bands due to the lack of efficient gain medium. Thanks to fiber optical parametric amplifier (FOPA), which is based on the third order nonlinear susceptibility of optical fibers, offers ultrafast response, wide-gain bandwidth, high gain and large frequency detune from the pump, serves as a promising candidate for signal amplification over those wavelength bands. By using the corresponding fiber optical parametric oscillator (FOPO) configuration, widely tunable source from continuous-wave (CW) to sub-picosecond pulses can be potentially generated to serve different applications from communication to biomedical imaging. In this thesis, we first demonstrate an all-fiber widely-tunable picosecond FOPO using highly-nonlinear fiber (HNLF). The tuning range is as wide as 250 nm, which is higher than previous picosecond FOPOs reported in the 1550-nm region. Second, time-dispersion tuning of the FOPO is investigated with fixed pump wavelength. It is a relatively simple and economic approach, and there will be no filter induced cavity loss. We then describe using FOPO to generated nearly-transform limited sub-picosecond pulses with a 60-nm tuning range. Another FOPO with a tuning range of 440-nm with dispersion-shifted fiber (DSF) as the gain medium is proposed and demonstrated. Compared with FOPOs demonstrated using HNLF as the gain medium, the use of DSF offers two key advantages: a wider tuning range and a narrower linewidth. In addition to picosecond FOPO, CW FOPO is also of great interest in fiber optical communications and biomedical imaging. We also demonstrate an all-fiber CW single-longitudinal-mode (SLM) FOPO with tuning range covers the S and L bands. SLM oscillation with a side-mode suppression ratio greater than 43 dB is achieved, which has been extended to 1-μm region under stable operation. Apart from static tuning, dynamic wavelength tuning of the FOPO is also discussed in this thesis with a cumulative speed exceeds 4,000,000 nm/s, which is higher than previous work reported in wavelength-swept FOPOs. The high-speed swept source would be useful in biomedical imaging and sensing applications. The amplification of the sub-picosecond pulses of the FOPO output is also investigated, for the first time to our knowledge, by using a fiber optical parametric chirped pulse amplifier(FOPCPA).The totally fiber-integrated nature of the whole system allows complete self-alignment and further integration to other fiber-based systems. All these research effort will show the versatility of FOPO techniques for generating wide range of optical sources for varies applications. These schemes may be useful in generating CW and short pulse for potential optical communication and biomedical imaging in non-conventional wavelength bands. DOI: 10.5353/th_b4961772 Subjects: Optical fibers Optical parametric oscillators
Download or read book Fiber Optical Parametric Oscillator for High Power High Efficiency Short Wavelength Generation written by and published by . This book was released on 2010 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report results from a contract tasking University of Southampton as follows. Optical parametric fiber oscillators are based on four-wave mixing. Four-wave mixing (FWM), like stimulated Raman scattering (SRS), relies on the third order nonlinearity of the fiber. Fiber Raman devices are capable of high efficiency (> 80%) and high power (> 10 W), but these generate wavelengths that are longer than the pump wavelength. By contrast, FWM is capable of generating shorter wavelengths than the pump, and this provides many new opportunities, including the possibility to generate high-power 800 nm radiation starting with highly efficient YDFLs. Whereas SRS ideally generates one Stokes photon for every converted pump photon, FWM generates one Stokes and one anti-Stokes photon for every two pump photons. Thus, for small wavelength shifts, the conversion efficiency into the shorter-wavelength anti-Stokes wave is limited to ~ 50%. However, for larger shifts the efficiency can be larger. For generation of 780 nm light from 1080 nm, the theoretical photon-energy limited conversion efficiency becomes 69%, achievable if all pump photons are converted to anti-Stokes (signal) and Stokes (idler) photons. Complete conversion of the pump photons is theoretically possible in the cw regime [1] and near-complete conversion has been demonstrated experimentally in the cw regime [2], [3]. However the powers have been relatively low and the frequency shifts relatively small. Furthermore the wavelengths have been around 1550 nm.
Download or read book NIR and SWIR Source Generation on Fiber Optical Parametric Oscillators for Biomedical Applications written by 陈楠 and published by . This book was released on 2017 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fiber Optical Parametric Oscillator written by Enric García Sánchez and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The parametric gain of a four-wave mixing (FWM) process in a configuration of a fiber optical parametric oscillator (FOPO) is one option to achieve the conversion of high peak power pulses at frequencies reachable with rare-earth doped fibers. The point is that rare-earth doped fiber lasers and amplifiers have restrictions in the wavelength coverage due to the available dopants and their electronic transitions. Thus, to extend this coverage, silica fibers are being used as nonlinear media to aid the frequency conversion process. The FOPO considered in this project consists of a 40 ps 1064 nm high peak-power pump laser, a well-characterized hybrid photonic crystal fiber (PCF) and a feedback system. Via FWM, the pump frequency is converted into new frequencies in the PCF, which can be feed back into the PCF and amplified, thereby creating a FOPO. The pump is converted to 1140 nm and 1000 nm through FWM in the hybrid PCF, and, even though all the components go through the FOPO recirculation system, only the 1000 nm component goes back into the hybrid PCF. The whole setup is based on free-space optics.
Download or read book Description of Fiber Optical Parametric Oscillators as Laser Sources Applied to Cellular Imaging written by and published by . This book was released on 2011 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: The integration of lasers has advanced imaging and quantitative analysis in the study of biological problems. In this document we describe a class of light sources known as fiber optical parametric oscillators (FOPO). The wavelength tunability of the FOPO system is a fundamental feature for the cellular imaging techniques in perspective. The FOPO converts the wave frequency provided by the pump into two other wave frequencies as its output. The difference between two waves frequencies produced by the FOPO, if corresponding to molecular vibrational transitions, is used to excite specific organic bonds. The current system allows one to probe vibrational transitions between 1050 cm-1 and 2220 cm-1. This spectral range allows one to excite C-D bonds, carbon-deuterium bond (2100 cm-1), C-H bonds (1445 cm -1), C=O bonds (1742 cm-1) and others bonds occurring in living cells. As methods we characterize and compare two FOPO systems based on two different photonic crystal fibers (PCF) and two laser pumps in order to assess their suitability for cellular imaging techniques. We optimize power, stability, and tunability of the output wavelength. Our characterization includes measurements of spectral tunability and pulse quality. The results expressed upon comparing of the two systems described in this thesis, showed that the picosecond/long fiber system is superior in terms of usability, average power efficiency, and stability but fails to encompass the full range of wavelengths necessary for the variety of intended applications. In comparison, the femtosecond/short fiber system, delivers superior wavelength tunability and pulse quality at the expense of usability and average power. We conclude that femtosecond/short fiber OPO system is the most suitable system between the two FOPOs systems explored in this study to be applied to nonlinear microscopy techniques. Coherent anti-Stokes Raman spectroscopy (CARS), which is used for imaging of non-stained biological samples, used as an example of nonlinear microscopy applied as a proof-of-concept experiment. The production and characterization of a laser source such as a FOPO that is able to produce desired wavelengths within the scope of cellular imaging, sets the stage for the use of these systems as an unique, efficient, and compact laser source for research of different cellular imaging techniques.
Download or read book All fiber Optical Parametric Oscillator for Coherent Raman Imaging written by Hanzhang Pei and published by . This book was released on 2015 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical parametric oscillator (OPO) is a kind of light source similar to a laser but based on parametric gain from amplification in a nonlinear medium rather than from stimulated emission. It features wide frequency tunability and high power narrow linewidth output, which enables its application to laser spectroscopy and atom-light interaction. Although OPOs could provide two synchronized pulse trains for coherent anti-Stokes Raman spectroscopy (CARS) imaging, they remain bulky and sensitive tools requiring careful alignment, making these devices unpractical for surgical situations. Thus, all-fiber source for coherent Raman imaging have generated interest among clinical researchers and doctors. Thanks to recent advances in the understanding of nonlinear pulse evolution in optical fibers and engineering of PCF structures, fiber-based OPOs have achieved performance comparable to conventional solid-state devices. This thesis discussed the previous effort towards an all-fiber source of pulses for use in CARS imaging, as well as principles behind picosecond pulse generation and coherent Raman imaging. An all-fiber OPO pumped by commercial solid state laser and divided pulse amplifier is demonstrated based on frequency conversion of picosecond pulses through four-wave mixing process in customized photonic crystal fiber. This will be another step further towards an all-fiber device for coherent Raman microscopy.
Download or read book High power Fiber laser pumped Optical Parametric Oscillators from the Visible to Mid infrared written by Suddapalli Chaitanya Kumar and published by . This book was released on 2012 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fiber Optical Parametric Oscillator and Its Application to All optical Clock Recovery written by Jia Li and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The ever increasing demand for broader bandwidth in recent decades arises from various aspects simultaneously such as the increase in the number of users, the advent of new access methodologies, and the demand for higher access rate as well as high-quality multimedia services. Fiber optical communication technology has being developed at an unprecedented speed to meet the increasing demand. High-speed optoelectronic devices and sophisticated transmission schemes have been invented in order to fully utilize the huge transmission bandwidth provided by optical fiber. Despite the fact that different technologies exhibit their own merits and drawbacks, they share some common but critical optical components such as lasers, amplifiers, signal processing and networking devices. Innovation on these optical devices improves the optical system performance while lowering down the overall cost. Lasers that produce high repetition-rate and short duration optical pulses are essential for high-speed OTDM/WDM communication systems. The cost of a WDM transmitter could be significantly reduced if highly stable multi-wavelength laser sources could be implemented to replace the traditional DFB laser diode arrays. All-optical signal processing functions such as all-optical clock recovery are vital for the future ultra-high-speed optical transport networks as the electronic signal processing speed might be limited to a few hundred Gb/s. In this dissertation, a novel type of fiber laser - fiber optical parametric oscillator (FOPO) is analyzed and demonstrated as a simple and cost-effective solution to the above mentioned applications. It will be demonstrated that FOPOs can be configured as multi wavelength laser sources if a narrowband transmission grating filter is included in the cavity. Inherent four-wave mixing in the parametric process helps to stabilize the power distribution of the lasing wavelengths by reducing the gain competition among multiple longitudinal modes. As a result, simultaneous lasing of 129 wavelengths with 25 GHz frequency spacing is demonstrated with spectral tuning and reconfigurable features. Following the study of continuous-wave operation, actively mode-locked FOPO is studied in detail by analyzing the impact of pump requirements and cavity designs on the characteristics of the mode-locked pulses. The results provide useful guidelines for such design that high-quality optical pulses can be generated from a simple configuration. Based on a similar configuration, rational harmonic mode-locking is investigated following the harmonic mode-locking counterpart. Optical pulses generation with various repetition-rates is demonstrated through this mechanism by simply tuning the cavity length without changing the cavity configuration. Mode-locked pulses with repetition rates from 10 GHz up to 240 GHz have been generated in the experiments. Finally, the application of actively mode-locked FOPOs in all-optical clock recovery is demonstrated. A detailed investigation is performed on the 10 Gb/s operation case. The results show that this method is promising as an all-optical clock recovery solution in terms of its robustness to the input signal quality degradations over a large range, namely duty cycle from 33% to 60%, average input power from -23 dBm to 6 dBm, extinction ratio above 8.7 dB, OSNR above 27 dB, residual dispersion between -600 ps/nm to 550 ps/nm, and DGD below 48 ps. All-optical clock recovery operating at 40 Gb/s is also demonstrated following the analysis." --
Download or read book Ultra Broadly Tunable Light Sources Based on the Nonlinear Effects in Photonic Crystal Fibers written by Lei Zhang and published by Springer. This book was released on 2015-10-14 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis examines laser generation from the ultraviolet to the short edge of the mid-infrared band by exploiting the nonlinear effects in photonic crystal fibers (PCFs). Several different physical mechanisms are investigated by using homemade PCFs with elaborately customized dispersion profiles. A particular focus is on the development of fiber optical parametric amplifiers (FOPAs) and oscillators (FOPOs) based on the PCFs with a zero-dispersion wavelength of ca.1.06 μm. In particular, several schemes are proposed for solving the key problems involved in the application of FOPOs. These oscillators can be made more convenient to use by optimizing the wavelength-tuning mechanisms and made more energy-efficient with the help of specially designed cavity structures. Today’s oscillators are more reliable, powerful and maneuverable than ever. This thesis provides a systematic road map in connection with the study of nonlinear wavelength generation in PCFs, from their fiber design and technical fabrication, to their physical mechanism and experimental investigation.
Download or read book Mid infrared Fiber Optical Parametric Oscillator Using a Three Hole Suspended core Chalcogenide Fiber written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Studies on Tunable Optical Parametric Oscillators written by Stanford University. Microwave Laboratory and published by . This book was released on 1976 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced High power Optical Parametric Oscillators Synchronously Pumped by Ultrafast Fibre based Sources written by Florian Kienle and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Parametric Oscillators written by Stanford University. Microwave Laboratory and published by . This book was released on 1975 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
