optical parametric oscillators are powerful solid state sources of broadly tunable coherent radiation covering the entire spectral range from the near UV to the mid IR and can operate down to the femtosecond time doma...
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optical parametric oscillators are powerful solid state sources of broadly tunable coherent radiation covering the entire spectral range from the near UV to the mid IR and can operate down to the femtosecond time domain. As a result of recent advances in nonlinear optical materials research, these oscillators are now practical devices with broad potential applications in research and industry. Recent developments in 3-barium borate (BBO), lithium triborate (LBO), and potassium titanyl phosphate (KTP) optical parametric oscillators in particular are reviewed in this article.
Over the past decade, artificial intelligence (AI) has led to disruptive advancements in fundamental sciences and everyday technologies. Among various machine learning algorithms, deep neural networks [1] have become ...
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Over the past decade, artificial intelligence (AI) has led to disruptive advancements in fundamental sciences and everyday technologies. Among various machine learning algorithms, deep neural networks [1] have become instrumental in revealing complex patterns in large datasets with key applications in computer vision, natural language processing, and predictive analytics. With the increasing prevalence and adoption of deep learning, the quest for hardware solutions that can efficiently process data in real time with high speeds and low latencies has come to the forefront of research in many fields. On-chip photonic neural networks offer a promising platform that leverage high bandwidths and low propagation losses associated with optical signals to perform analog computations for deep learning [2–6]. However, nanophotonic circuits are yet to achieve the required linear and nonlinear operations simultaneously in an all-optical and ultrafast fashion. Here, we report an ultrafast nanophotonic neuromorphic processor using an opticalparametric oscillator (OPO) fabricated on thin-film lithium niobate (TFLN). The input data is used to modulate the optical pulses synchronously pumping the OPO. The consequent signal pulses generated by the OPO are coupled to one another via the nonlinear delayed dynamics of the OPO, thus forming the internal nodes of a deep recurrent neural network. We use such a nonlinearly coupled OPO network for chaotic time series prediction, nonlinear error correction in a noisy communication channel, as well as noisy waveform classification and achieve accuracies exceeding 93% at an operating clock rate of ∼ 10 GHz. Our OPO network is capable of achieving sub-nanosecond latencies, a timescale comparable to a single clock cycle in state-of-the-art digital electronic processors. By circumventing the need for optical-electronic-optical (OEO) conversions, our ultrafast nanophotonic neural network paves the way for the next generation of compact all-optical
Progress in continuous-wave and ultrafast femtosecond optical parametric oscillators, covering spectral regions from 250 nm in the ultraviolet to 5 mu m in the infrared, using novel design concepts and advanced laser ...
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ISBN:
(纸本)9781557528902
Progress in continuous-wave and ultrafast femtosecond optical parametric oscillators, covering spectral regions from 250 nm in the ultraviolet to 5 mu m in the infrared, using novel design concepts and advanced laser pump sources is reviewed. (C) 2010 optical Society of America
In recent years optical parametric oscillators (OPOs) have undergone a renaissance largely due to the discovery of new nonlinear materials capable of wide continuous tuning ranges spanning from the UV to the near-infr...
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ISBN:
(纸本)0819420506
In recent years optical parametric oscillators (OPOs) have undergone a renaissance largely due to the discovery of new nonlinear materials capable of wide continuous tuning ranges spanning from the UV to the near-infrared spectral regions. To date, however, OPOs have not been exploited in the medical field despite their advantages over the dye laser in terms of tuning range and solid state structure. We consider the development of an OPO based on barium borate (BBO) which can be tailored to suit applications in medicine. Converting the maximum number of pump photons to tunable signal and idler photons is of great importance to secure high-fluence radiation necessary for many treatments. With this in mind, we report on an all- solid-state system using BBO which has been optimized by computer modeling with the potential of delivering amplification factors of typically up to 20 over a continuous tuning range of 700 nm to 1000 nm. As an example of its biomedical application, we describe the selective excitation of biomolecules and chromophores for cell destruction using malachite green isothiocyanate labelled bacteria. The potential for development is reviewed towards other medical applications such as diagnostic sensing and phototherapy.
Carbon dioxide (CO2) and methane (CH4) are the most important of the greenhouse gases that are directly influenced by human activities. The Integrated Path Differential Absorption (IPDA) lidar technique using hard tar...
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ISBN:
(纸本)9780819488091
Carbon dioxide (CO2) and methane (CH4) are the most important of the greenhouse gases that are directly influenced by human activities. The Integrated Path Differential Absorption (IPDA) lidar technique using hard target reflection in the near IR (1.57 mu m and 1.64 mu m) to measure the column-averaged dry air mixing ratio of CO2 and CH4 with high precision and low bias has the potential to deliver measurements from space and air that are needed to understand the sources and sinks of these greenhouse gases. CO2 and CH4 IPDA require tunable laser sources at 1.57 mu m and 1.64 mu m that coincide with appropriate absorption lines of these species having high pulse energy and average power as well as excellent spectral and spatial properties. Within this study we have realized more than 50mJ of pulse energy in the near IR coincident with appropriate absorption lines using an injection-seeded opticalparametric oscillator-amplifier system pumped at 100 Hz. At the same time this device showed excellent spectral and spatial properties. Bandwidths of less than 100 MHz with a high degree of spectral purity (> 99.9 %) have been achieved. The frequency stability was likewise excellent. The M-2-factor was better than 2.3. Owing to these outstanding properties opticalparametric devices are currently under investigation for the CH4 lidar instrument on the projected French-German climate satellite MERLIN. A similar device is under development at DLR for the lidar demonstrator CHARM-F which will enable the simultaneous measurement of CO2 and CH4 from an airborne platform.
Progress in continuous-wave and ultrafast femtosecond optical parametric oscillators, covering spectral regions from 250 nm in the ultraviolet to 5 μm in the infrared, using novel design concepts and advanced laser p...
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The latest advances in nonlinear wavelength conversion sources and optical parametric oscillators based on a new generation of nonlinear materials covering spectral regions into the deep-infrared and novel application...
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New strategies for the generation of tunable coherent radiation in the visible and ultraviolet using optical parametric oscillators are outlined. Spectral regions from 250 to 740 nm are accessed in the cw and femtosec...
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The latest advances in femtosecond optical parametric oscillators delivering tunable mid-IR radiation at wavelengths as far as 8 um, with average powers exceeding 100 mW, and pulse durations down to 3.7 optical cycles...
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