B. Fischer

Technion Israel Institute of Technology, Electrical Engineering, Faculty Member

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Professor Baruch Fischer is with the Department of Electrical Engineering of the Technion since 1983, where he holds the Max Knoll Chair in Electro-Optics and Electronics. He served there as the Dean of the Electrical Engineering Department during 1999-2004, was the Head of the Micro-Electronics Research Center during 1993-2001, and the Head of the Opto-Electronics Research Center since 2008. He graduated in 1980 from Bar-Ilan University, was a Weizmann Post-Doctoral Fellow at Caltech during 1981-1983, and stayed for various periods at Caltech, USC, Bell Labs, the University of Illinois and MIT. He is a Fellow of the Optical Society of America, was a Topical Editor for Optics Letters, on the Editorial Board of the Journal of Nonlinear Optical Physics and Materials, a Director of the Board of MRV Communications, Inc. (Chatsworth, CA), and a member of the Technion Board of Governors. His current research interests include: nonlinear optics (in the past, photorefractive and phase conjugate optics), fiber-optics and fiber-optic communications, many-body photonics
(statistical-mechanics and quantum-mechanics based study in optics and lasers that include new laser light condensation phenomena, phase transitions, and critical behavior in lasers and light), and pulse-optics. He has authored or co-authored about 300 journal and conference papers and holds nine patents in the field of photonics,

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$Research paper thumbnail of Coherent oscillation by self-induced gratings in the photorefractive crystal BaTiO3$

Coherent oscillation by self-induced gratings in the photorefractive crystal BaTiO3

Applied Physics Letters, 1982

We report here the demonstration of several new optical oscillator configurations including a uni... more We report here the demonstration of several new optical oscillator configurations including a unidirectional ring oscillator and a self-pumped phase conjugate mirror. The gain medium is BaTi0 3 , pumped by a 632.8-nm He-Ne laser at power levels down to 50f-lW.

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Amplifying continuous wave phase conjugate mirror with strontium barium niobate

Applied Physics Letters, 1982

We report the use ofSr,_xBaxNb 2 0 6 as an efficient holographic four-wave mixing medium. We have... more We report the use ofSr,_xBaxNb 2 0 6 as an efficient holographic four-wave mixing medium. We have used this material in a continuous wave phase conjugate mirror with reflectivity exceeding unity, and in a phase conjugate resonator.

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Optical comb filter based on spectral Talbot effect in uniform fibre Bragg gratings

Electronics Letters, 2007

We report on the observation of puzzling nonuniform, but ordered, frequency combs in erbium-doped... more We report on the observation of puzzling nonuniform, but ordered, frequency combs in erbium-doped fiber lasers at low temperatures, between 3 K and 14 K. At ~14 K the combs disappear. The combs contain ~240 lines and have nonuniform frequency spacings that starts from ~25 GHz at ~1540.5 nm and decreases, almost monotonically, to ~100 MHz within (1.8-2) nm. We discuss possibilities that they result from enlarged regular mode-comb spacings, from prime numbers-based solitary waves free of four-wave mixing or result from gain gratings. However, we think that the combs originate from multi-lasing lines allowed in inhomogeneous gain broadening, dominant at low temperatures, together with a small power dependent homogeneous broadening part, responsible for the spacing between the lines.

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Phase Transition Theory of Many-Mode Ordering and Pulse Formation in Lasers

Physical Review Letters, 2002

A novel theory for the ordering of many interacting modes in lasers is presented. By exactly solv... more A novel theory for the ordering of many interacting modes in lasers is presented. By exactly solving a Fokker-Planck equation for the distribution of waveforms in the laser in steady state, equivalence of the system to a canonical ensemble is established, where the role of temperature is taken by amplifier noise. Passive mode locking is obtained as a phase transition of the first kind and threshold is calculated, employing mean field theory backed up by a numerical study. For zero noise, compliance with the existing noiseless theory is shown.

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Localization in frequency for periodically kicked light propagation in a dispersive single-mode fiber

Optics Letters, 1999

We show a special effect of localization in the temporal frequency domain of light pulses that pr... more We show a special effect of localization in the temporal frequency domain of light pulses that propagate in a dispersive single-mode f iber in the presence of a time-periodic phase modulation that is repeatedly applied at equally spaced locations along the f iber. The effect is analogous to the dynamical localization that occurs for the quantum kicked rotor, which is similar to Anderson localization in disordered solids. The wave behavior eliminates the diffusive spread of sidebands (harmonics). The light propagation, which is described by a Schrödinger-like propagation equation, can provide a new testing ground for the investigation of localization besides shedding light on technologically important pulse propagation in f ibers and mode-locked lasers.

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$Research paper thumbnail of Photorefractive saturable absorptive and dispersive optical bistability$

Photorefractive saturable absorptive and dispersive optical bistability

Optics Communications, 1989

It is shown that photorefractive wave-mixing gives saturable gain, saturable absorption and Kerr-... more It is shown that photorefractive wave-mixing gives saturable gain, saturable absorption and Kerr-like nonlinear phase retardation. An analogy between photorefractive two-beam coupling and two-level atom system is then drawn. We investigate optical bistability in a ring cavity, utilizing these phenomena, and compare our results with classical absorptive and dispersive optical bistability.

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Optical pulse intensity and phase measurement by time-to-space conversion based on time-lens operation

Electronics Letters, 2001

Summary form only given. Methods for real time characterization of optical pulses based on time-l... more Summary form only given. Methods for real time characterization of optical pulses based on time-lens operation have the advantage that they allow the direct measurement of the pulse intensity profile without any mathematical processing. In the present work we demonstrate the ability to measure both the intensity and the phase profiles of an optical pulse, using time-lens operation.The principle of the measurement can be explained by the known analogy between the diffractive propagation of light beams in the paraxial approximation and the propagation of narrow-band pulses in dispersive media

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Saturable absorption, wave mixing, and phase conjugation with bacteriorhodopsin

Optics Letters, 1990

Bacteriorhodopsin exhibits strong nonlinear and saturation behavior with very low light intensiti... more Bacteriorhodopsin exhibits strong nonlinear and saturation behavior with very low light intensities (-o0 mW/cm 2). A model and an experimental study of the saturation are described. Four-wave mixing experiments are used for obtaining phase conjugation and information on the holographic resolution of the material. Two kinds of samples were prepared and used in the experiments: films of bacteriorhodopsin in a solid polyvinylalcohol (polymer) matrix and in water.

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Strong self-defocusing effect and four-wave mixing in bacteriorhodopsin films

by Aaron Lewis and B. Fischer

Optics Letters, 1992

We find strong self-defocusing in bacteriorhodopsin films in the near IR with powers in the tens ... more We find strong self-defocusing in bacteriorhodopsin films in the near IR with powers in the tens of milliwatts. The defocused beam acquires a ring pattern because of spatial self-phase modulation. We also demonstrate efficient four-wave mixing with phase-conjugate reflectivities of 26%. We discuss the origin of this high nonlinearity.

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