Intense stimulated raman scattering preferentially depletes and steepens the leading edge of 1. Optical pulse compression in dispersion decreasing photonic crystal. Highpower femtosecond optical pulse compression by using. This effect has conventionally been avoided in fiber supercontinuumbased pulse compression because the accumulated frequency chirp of the output pulse cannot be fully compensated by a standard prism or grating pair. The use of an optical pulses transverse intensity pro. Alloptical control and metrology of electron pulses science.
A chirp introduced by the fiber was not well matched to the chirp of the grating compressor leading to poor quality of the compression and low compression ratio. Optical pulse compression with diffraction gratings pdf. Bates optical pulse compression using polarizing techniques. Alloptical pulse compression of broadband microwave signal based on stimulated brillouin scattering xin long, 1 weiwen zou, 1, 2, and jianping chen1, 2 1state key laboratory of advanced optical communication systems and networks, department of electronic engineering, shanghai jiao tong university, shanghai 200240, china. Figure 1 shows the construction of such a compressor. We show that the primary limitation on pulse compression is the loss due to mode leakage. Selfphase modulation and optical pulse compression. Leaird bellcore, 331 newman springs road, red bank, new jersey 07701 received may 1, 1991 we demonstrate a novel pulsecompression technique. The pulse is linearly chirped in the fiber by the com bination of group velocity dispersion and selfphase modulation 2. The analogy between optical pulse compression and optical coherence transformation. Opticalpulse compression article about opticalpulse. 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. We produce these extremely short pulses by using nonlinear frequency broadening in a short piece of optical fiber followed by compression with a dispersive. Such short durations make light pulses very interesting for many applications, such as.
Pdf optical pulse compression in dispersion decreasing. Linear compression of chirped pulses in optical fibre with large step. Selfphase modulation and optical pulse compression influenced by. We report the generation and measurement of art optical pulse of only 30 fsec 3. The analogy between optical pulse compression and optical. Find out information about opticalpulse compression. 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. Nonlinear pulse propagation material refractive index n n 2,lcm2w sapphire al 2o 3 1. Although the dispersion of the prism material causes different wavelength components to travel along different. Pulse compression gratings kaiser optical systems, inc. Optical pulse compression and its effects using fiber. Ultrasonic imaging system by using optical pulse compression.
Supercontinuum generation and pulse compression in short. A long pulse is deliberately produced by stretching a short, lowenergy pulse in a single mode optical fiber. The variation of frequency detuning and coupling coefficient with respect to the length of the grating is also studied. Ultrashort pulse compression using photonic crystal fibre.
The unique optical properties of this novel medium in terms of high non linearity and relatively small group velocity dispersion are shown to provide an ideal. A combination of selfphase modulation and group velocity dispersion in optical fiber was used to expand the spectrum and to chirp the pulse of a picosecond oscillator. Amplification of ultrashort pulses almost always requires the technique of chirped pulse amplification. An efficient time lens for optical pulse compression. The experimental implementation of our terahertzfieldcontrolled electron beamline is depicted in fig. 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. The proposed opcr makes use of the frequencymodulationbased pulsecompression. Firstly, the required dispersion profile for the highorder dispersion compensation is derived, according to the linear chirp and the nonlinear chirp of a phasemodulated continuouswave cw laser source. Optical pulse compression using polarizing techniques.
It can break the limitation in conventional otdr and ofdr with simpler optical implementation. The paper presents the principle and some experimental results of new ultrasonic imaging techniques that use a linear fm. They solve the problem of extracavity pulse compression, and provide control of the pulse width in almost all of the experiments performed using ultrashort pulses. The stretched pulse is amplified and then compressed by a double grating compressor 3. Pulse compression 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 diffraction gratings. In optics, an ultrashort pulse of light is an electromagnetic pulse whose time duration is of the order of a picosecond 10. Selfcompression of optical laser pulses by filamentation. The optical power of the sc optical pulses was reduced to avoid nonlinear e. Low dispersion management reflectors for passive modelocking of ultrafast lasers sphere ultrafast photonics. We report the first experimental demonstration of the optical pushbroom a novel type of alloptical pulse compression.
Optical pulse compression using the combination of phase. The rp photonics buyers guide contains 19 suppliers for pulse compressors. Chirped pulse amplification center for ultrafast optical. This is the shortest optical laser pulse ever generated and corresponds to 14 optical cycles. It uses the negative dispersion property of permanent phase gratings created within. Such pulses have a broadband optical spectrum, and can be created by modelocked oscillators. Pdf design rules of optical pulse compression using fiberfiber. Otdm is a high capacity, high bitrate communication system. Pdf an optical pulse compressor using a normal dispersion fiber combined with a linearly chirped fiber grating instead of a bulk grating pair. Ultrafast optical pulse shaping using dielectric metasurfaces. Optical pulse compression based on enhanced frequency. Linear optical pulse compression based on temporal zone plates. Pulse compression method for radar signal processing. The nonlinear compression of optical pulses relies on a delicate balance of a materials nonlinearity and optical dispersion.
At present, the compression method that is achieving parabolic pulse with linear chirp and compensating the linear chirp is paid more attention. Wavebreaking often occurs when a short intense optical pulse propagates in a long normally dispersive optical fiber. It also describes several other nonlinear techniques that use optical fibers for pulse compression including crossphase modulation and fourwave mixing. 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. Pedestal free pulse compression of chirped optical solitons. Optical pulse compression using highorder dispersion compensation is proposed and theoretically analyzed. Balant, optical pulse compression based on enhanced. Especially to compress a pulse to near the transform limit one should not. The metasurface is divided into n superpixels s k indexed k 1, 2, n contiguously arranged along the x direction. 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.
Alloptical threedimensional electron pulse compression. Pulse stretching and compressing using grating pairs the gdd introduced by a grating compressor of this type is given by the following equation. Selfphase modulation and optical pulse compression influenced by stimulated raman scattering in fibers a. Simulation of optical pulse compression using parabolic.
Through numerical simulations, we show that, under relatively general conditions, passage of an intense picosecond pulse through a single. The pulse is linearly chirped in the fiber by the combination of group velocity dispersion and selfphase modulation 2. We report the results of a theoretical analysis of this process. Pulse compression using a tapered microstructure optical. In these techniques a long duration pulse is used which is either phase or frequency modulated before transmission and the received signal. Pulse compression techniques are used in radar systems to avail the bene. It is the key of realizing high speed, large capacity fiber information transmission that achieve ultrashort optical pulse by optical pulse compression. Cmhh6 pulse compression and modelocking by using tpa.
Pulse compression allows one to generate pulses of long duration minimizing damage problems and subsequently compress optical. Wavebreakingextended fiber supercontinuum generation for. Pulse stretching and compressing using grating pairs. A shorter pulse could lead to drastic cost and size reduction of the laser facility, since most of the purchasing price of ampli. A comprehensive study on the effect of frequency detune, coupling coefficient, figure of merit, and compression factor is done. 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. Sc optical pulses were generated at a peak input power of 3.
Wai3 1photonics division, department of physics, school of advanced sciences, vit university, vellore 632 014, tamil nadu, india. Optical pulse compression in dispersion decreasing photonic crystal fiber. Lasers and related devices have been found to have an amazing potential for generating light pulses with very special properties there is a wide range of techniques for generating pulses with durations of nanoseconds, picoseconds, or even femtoseconds with lasers. Femto second pulses find applications in optical time division multiplexed otdm communication system. The optical pulse compression is analyzed by nlse using fiber bragg grating fbg with the help of second order dispersion. Also, because the optical fiber supports only a single transverse. We calculate the pulse compression in a tapered microstructure optical. Development of radar pulse compression techniques using. Rp photonics encyclopedia pulse compression, shortening. R27r29 february 1993 with 27 reads how we measure reads. The pulse compression ratio pcr is defined as width of the pulse after compression width of the pulse before compression pcr 2 2. Highpower femtosecond optical pulse compression by using spatial solitons d. Osa compression of optical pulses chirped by selfphase.
Alloptical pulse compression of broadband microwave. A method is described for compressing optical pulses at any wavelength in an optical fiber. Pedestal free pulse compression of chirped optical solitons k. We discuss the design constraints for tapered pcfs used for adiabatic soliton compression and demonstrate over 15 times compression of pulses from over 830 fs. Heritage bell communications research, 331 newman springs road, red bank, new jersey 077017020 r. 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.
A well developed technique for pulse compression has been used for several years. Conventional ultrasonic imaging techniques, including holographic, have high resolution in angle, but relatively poor resolution in range, because resolution in range is obtained only by use of selective focus or parallax, which is useful only with small focal ratio. This paper presents a novel reflectometry called optical pulse compression reflectometry opcr, which is inspired by the concept of pulsecompression radar 10,11. With the use of the highorder dispersion compensation, such as the combination. Numerical results are presented for the achievable compression and compressed. Hence, this free carrier buildup will induce larger loss at the trailing edge of the pulse than the loss at the leading edge and facilitate a pulse compression and modelocking if it is used inside a resonator.
Singlediffractiongrating and grism pulse compressors. For wavelengths less than those used in telecommunications about 1. A schematic of a fourier transform pulseshaping setup, consisting of a pair of diffraction gratings, a pair of parabolic mirrors, and a pulseshaping metasurface. Singledispersiveelement pulse compressors our singlediffractiongrating pulse compressor uses only three elements.