منابع مشابه
Optics, Lasers, and Quantum Electronics
A possibility of the two-photon excitation of an isomeric state in a nucleus of thorium-229 has been discussed. The fluorescence intensity of the excitation is demonstrated to be identical for the irradiation of nuclei with either monochromatic light or polychromatic radiation consisting of a sequence of short light pulses of the same intensity. The two-photon excitation of Th3+ ion in an elect...
متن کاملOptics and Lasers in Engineering
A dual-wavelength image-plane digital holography, combined with a windowed Fourier analysis, is presented for dynamic measurement of a vibrating object. In order to expand the range of the velocity measurement, the object is simultaneously illuminated by two lasers with different wavelengths. A sequence of digital holograms of a vibrating object is captured by a CCD camera and two wrapped phase...
متن کاملTemperature Effect on THz Quantum Cascade Lasers
A simple semi-phenomenological model, which accurately predicts the dependence of thresholdcurrent for temperature of Resonant-phonon three well quantum cascade laser based on verticaltransitions is offered. We found that, the longitude optical phonon scattering of thermally excitedelectrons is the most important limiting factor for thermal performance of high frequency THz QCLs.In low frequenc...
متن کاملFiber-lasers for ultrafast optics
The current status of a fiber-based ultrafast technology is reviewed. Pulse generation techniques capable of producing femtosecond pulses are discussed. Here we describe passive and active–passive mode locking techniques as well as linear and nonlinear fiber amplifiers. Thirtyfemtosecond pulses may be generated directly from fiber oscillators or by implementing pulse compression techniques. The...
متن کاملLasers and the Growth of Nonlinear Optics
Nonlinear optical effects were seen long before the laser was invented. In 1926, Russians Sergey Vavilov and Vadim L. Levishin observed optical saturation of absorption when they focused bright microsecond pulses to power densities of kilowatts per square centimeter. Vavilov introduced the term “nonlinear optics” in 1944, and during World War II Brian O’Brien put saturation to practical use in ...
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ژورنال
عنوان ژورنال: The Review of Laser Engineering
سال: 2010
ISSN: 0387-0200,1349-6603
DOI: 10.2184/lsj.38.13