With the rp fiber power software, one simulate the compression of ultrashort pulses for example, by spectral broadening in a fiber amplifier or a passive fiber, followed by dispersive compression with a pair of prisms or diffraction gratings, or with a numerically optimized compressor. Numerical results for gaussian and hyperbolicsecant initial pulse shapes and various initial amplitudes are used to verify the approximate analytic result and to determine accurate scaling constants. It is shown that the fiber and gratingpair pulse compression technique is limited by higherorder terms in the response of the. Find out information about opticalpulse compression. As shown by the sample images above, pulse width broadening can lead to significantly decreased image contrast in twophoton microscopy. Alloptical control and metrology of electron pulses science. Leaird bellcore, 331 newman springs road, red bank, new jersey 07701 received may 1, 1991 we demonstrate a novel pulse compression technique that uses the selfconfinement of twodimensional spatial. The pulse is linearly chirped in the fiber by the combination of group velocity dispersion and selfphase modulation 2. There are two typical choices for the modulation format of the signal. The net result is to produce a redshifted, pedestalfree, compressed pulse. The concepts were built on work reported by mullen at al. After discussing the fundamental issues on pulse compression, we summarize and categorize various kinds of techniques for pulse compression.
Optical pulse compression using polarizing techniques. Rp photonics encyclopedia pulse compression, shortening. Figure 5 shows the optical fiber dispersions parameters. Pdf solitoneffect optical pulse compression in bulk. Pdf almost chirp free optical pulse compression using non linear fiber bragg grating with exponentially decreasing dispersion is investigated. Cmhh6 pulse compression and modelocking by using tpa in. The stretched pulse is amplified and then compressed by a double grating compressor 3. The compression filter are simply dispersive delay lines with a delay, which is a linear function of the frequency. With our state of the art selection of high quality, name brand glasses, you will easily find the perfect pair for you. Electron pulse compression requires deceleration and acceleration of the. Osa compression of optical pulses chirped by selfphase. We propose an holographic method for the compression or shaping of optical pulses broadened by group velocity dispersion. May 31, 2019 finely tailored pulse shaping operations, including splitting, compression, chirping, and higherorder distortion, are achieved using a fouriertransform setup embedding metasurfaces able to manipulate, simultaneously and independently, the amplitude and phase of the constituent frequency components of the pulse. An optical pulse of 50fs width from the colliding pulsemodelocked dye laser oscillating at 620 nm was compressed down to 6 fs by the pulse compression technique 22.
These systems not only have been treated as a fundamental problem in optics but have been applied to the development of narrow band filters especially for use in astronomy. Although wefocus onelectrons, ourtheoryapplies toany. In conclusion, we have shown that by first stretch ing a chirped optical pulse and then amplifying before compressing, high peak power pulses can be achieved. Taraprasad chattopadhyay department of physics visvabharati university santiniketan, west bengal, india. The metasurface is divided into n superpixels s k indexed k 1, 2, n contiguously arranged along the x direction. Singlediffractiongrating and grism pulse compressors vikrant chauhan, pamela bowlan, jacob cohen, and rick trebino school of physics, georgia institute of technology, 837 state street, atlanta, georgia 30332 usa. Assisted by optical pulse compression technique in the oeo, the fullwidthat halfmaximum of the generated optical pulses is narrower than 20 ps.
Index termssemiconductor laser, pulses, microwave photonics, optoelectronic oscillator oeo. Temporal solitons and pulse compression in photonic. We report the results of a theoretical analysis of this process. Singlediffractiongrating and grism pulse compressors. Yuksek, feng qian and ozdal boyraz eecs department, university of california, irvine, 92697, email. Optical pulse compression theory general perspective. An optical fiber for use in a pulse compressor which compresses a relatively long width optical pulse to a short width pulse, has a v number between 2 and 2.
A short flash of light, used to isolate moments of time. Cmhh6 pulse compression and modelocking by using tpa. Compression of optical pulses chirped by selfphase modulation in fibers. In some cases, the obtained output pulses are far shorter than the input pulses. A prism compressor is an optical device used to shorten the duration of a positively chirped ultrashort laser pulse by giving different wavelength components a different time delay. We then focus on the use of highly nonlinear fiber hnlf in a pulse compressor to improve the performance. Pulse stretching and compressing using grating pairs. Taraprasad chattopadhyay department of physics visva.
Experimentally we obtain 25 fold pulse compression and 400ps modelocked. Development of radar pulse compression techniques using. Pdf we suggest using a wavecollapse mechanism for the compression of optical pulses. For many years the behavior of collections of optical elements which have the ability to transform the polarization state of light has been studied. Wai3 1photonics division, department of physics, school of advanced sciences, vit university. The compression filter allows the end of the pulse to catch up to the beginning, and produces a narrower output pulse with a higher amplitude. Highpower femtosecond optical pulse compression by using. Development of a 19nm laser radar using fiber optics. Ultrafast optical pulse shaping using dielectric metasurfaces. Pulse compression gratings kaiser optical systems, inc.
Since the group velocity of the light is determined. In the optical pushbroom high intensity pump pulses, tuned well away from the resonance of a bragg grating, modify the transmission of a weak probe tuned near to the gratings photonic bandgap. Usa we have demonstrated the amplification and subsequent recompression of optical chlrped pulses. A short optical pulse less than 1ps from a low power.
Such pulses have a broadband optical spectrum, and can be created by modelocked oscillators. Pdf solitoneffect optical pulse compression in bulk media. So replacement of bulk diffraction grating in compressor part can be possible if the desired compression of pulse obtained by controlling the pulse as well as the optical fiber parameters. Highpower femtosecond optical pulse compression by using spatial solitons d. Pulse stretching and compressing using grating pairs grating pairs in order to reach shortest pulses after dispersive propagation, it is possible to compensate this pulse broadening by applying dispersion of the opposite sign, i. Compression of positively chirped pulses also happens in negative dispersion anomalous regime 5. Alloptical threedimensional electron pulse compression liang jie wong1. The transmitted signal, a gated cw optical carrier intensity modulated with a linear fm chirp rf signal 3, is launched into free space through a telescope.
Appropriately, designing the dispersion in the nonlinear medium enables compressed pulses with more than 90% of the pulse energy confined in the main lobe to be generated. Wai c a photonics division, department of physics, school of advanced sciences, vit university, vellore 632 014, tamil nadu, india b school of engineering, fraser noble building, kings college, university of aberdeen, aberdeen ab24 3ue, scotland, uk. Leaird bellcore, 331 newman springs road, red bank, new jersey 07701 received may 1, 1991 we demonstrate a novel pulsecompression technique. Pdf design rules of optical pulse compression using fiberfiber. An efficient time lens for optical pulse compression. The clarity of the experimental results and their close agreement with numerical. Pedestal free pulse compression of chirped optical solitons. Selfdecompression selfdispersion is also treated in the same fashion. Pedestal free pulse compression of chirped optical solitons k. Pulse compression techniques are used in radar systems to avail the bene. Nov 21, 2012 the effect of group velocity dispersion and free carrier lifetime on pulse quality and nonlinear phase acquisition is studied in a twostage pulse compressor on a silicon chip. Opticalpulse compression article about opticalpulse.
Gratings for laser pulse compression wasatch photonics. With a simple model, scaling laws are obtained for selfcompression in the limit of a large soliton number. Wai3 1photonics division, department of physics, school of advanced sciences, vit university, vellore 632 014, tamil nadu, india. Ultracompact gratingbased monolithic optical pulse compressor for. The interest in using large lasers to achieve a very short and intense pulse for generating fusion plasma has provided a strong impetus to reexamine the possibilities of optical pulse compression at high energy. A schematic of a fourier transform pulseshaping setup, consisting of a pair of diffraction gratings, a pair of parabolic mirrors, and a pulseshaping metasurface. Compression of amplified chirped optical pulses donna strickland and gerard mourou t,ohorurorv or lu.
Optical pulse article about optical pulse by the free. Pulse compression allows one to generate pulses of long duration minimizing damage problems and subsequently compress optical. Pdf modeling chirp free optical pulse compression using. The experimental implementation of our terahertzfieldcontrolled electron beamline is depicted in fig.
A long pulse is deliberately produced by stretching a short, lowenergy pulse in a single mode optical fiber. In another aspect of the present invention the optimum length of an optical fiber which may be used to generate self phase modulation in a pulse compression apparatus is selected by successively cutting off. Wai c a photonics division, department of physics, school of advanced sciences, vit university, vellore 632 014, tamil nadu, india. Optical pulse compression on a silicon chipeffect of. Solitoneffect compression of picosecond pulse in optical fibers with slowly decreasing dispersion was studied by soluting the nonlinear schrodinger equation nls including gain effect. Most optical pulse compression schemes are based on the generation of a frequency swept pulse, followed by passage through a dispersive delay line. Alloptical threedimensional electron pulse compression. Bates optical pulse compression using polarizing techniques. Clark jones and show how an extension of his calculus can be used to formulate optical systems that can be utilized to compress certain optical pulses. The hologram is made in a photorefractive material by the interference of the broadened pulse and the corresponding fourier transform limited pulse.
Pdf an optical pulse compressor using a normal dispersion fiber combined with a linearly chirped fiber grating instead of a. Distortion free pulse stretching and compression by chirped volume holographic gratings. Kaiser is a pioneer in the use of vph gratings in ultrafast lasers with some of our earliest pulse compression gratings being designed for the center for ultrafast optical science located at the university of michigan and delivered in 1995. Optical pulse compression with reduced wings springerlink. For wavelengths less than those used in telecommunications about 1.
Study of chirped pulse compression in optical fiber for all fiber cpa system arpan dutta department of physics, university of burdwan, burdwan, west bengal, india abstract fiber lasers are highly regarded in present laser technological fields due to their high efficiency, beam quality and easy thermal management. Temporal solitons and pulse compression in photonic crystal. According to another aspect of the invention, a method for selecting an optical fiber having an optimum length for pulse compression, the optimum length of an optical fiber for use in pulse compression, i. Selfphase modulation and optical pulse compression influenced by. The use of selfphase modulation in a singlemode fiber to chirp an optical pulse, which is then compressed with a gratingpair compressor, has been shown to be a practical technique for the production of optical pulses at least as short as 30 fsec. In this article, we demonstrate the first experimental observations of optical solitons and pulse compression in. Figure 6 shows the soa pulse compression project layout. Pulse compression denotes linear or nonlinear techniques for reducing the durations of optical pulses. As an example of an application of the pulse compression with linear fm. Free space diffraction efficiency 90% low spatial chirp no stitching errors highly repeatable performance near diffraction limited beam quality applications. Treatment of waveguides jonathan andreasen and miroslav kolesik college of optical sciences, university of arizona, tucson az 85721 department of physics, constantine the philosopher university, nitra, slovakia acknowledgments this work was supported by the u.
Optical pulse compression on a silicon chipeffect of group. The shortening of the duration of an optical pulse by techniques similar to those used in chirp radar, in which a frequency sweep is imposed on the pulse. Even without any space charge, electron pulses unavoidably have a finite duration after acceleration because of dispersion. Effect of tpa and fca interplay on pulse compression in silicon enkuang tien, nuh s. With a simple model, scaling laws are obtained for self compression in the limit of a large soliton number. Numerical results are presented for the achievable compression and compressed. Pulse compression techniques using highly nonlinear fibers. The effect of group velocity dispersion and free carrier lifetime on pulse quality and nonlinear phase acquisition is studied in a twostage pulse compressor on a silicon chip. We report the first experimental demonstration of the optical pushbroom a novel type of alloptical pulse compression. Our ultraclear transmissive gratings have the highest efficiency on the market, with virtually no ghosting or scatter. The first step in the design of an optical communication systems is to decide how the electrical signal should be converted into an bit stream.
Limits of fibergrating optical pulse compression osa. All optical threedimensional electron pulse compression. Wasatch photonics enhanced volume phase holographic vph gratings are exceptional for pulse compression and pulse stretching of high power ultrafast lasers. Effect of tpa and fca interplay on pulse compression in. Pulse compression allows one to generate pulses of long duration minimizing damage problems and subsequently compress optical pulses to achieve the. So replacement of bulk diffraction grating in compressor part can be possible if the desired compression of pulse obtained by controlling the pulse as. Welcome to optical pulse we care about you and your clear vision. Generalized unidirectional pulse propagation equations.
An optical pulse of 50fs width from the colliding pulse modelocked dye laser oscillating at 620 nm was compressed down to 6 fs by the pulse compression technique 22. Singlediffractiongrating and grism pulse compressors vikrant chauhan, pamela bowlan, jacob cohen, and rick trebino school of physics, georgia institute of. In optics, an ultrashort pulse of light is an electromagnetic pulse whose time duration is of the order of a picosecond 10. Nov 21, 2010 in this article, we demonstrate the first experimental observations of optical solitons and pulse compression in. Swamp optics tutorial pulse compression recall that different colors propagate at different velocities so that, after passing through the material, different colors experience different delays, a ubiquitous effect called groupdelay dispersion gdd. Distortion free pulse stretching and compression by chirped volume holographic gratings christophe moser, frank havermeyer ondax, inc.
1408 1144 787 1412 1444 703 966 1046 1332 305 166 322 256 981 72 831 182 1103 1432 547 511 1328 594 130 166 215 97 742