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 کاملHEAT TREATMENT AND OPTICAL SPECTROSCOPY OF CR4+:GGG FOR PASSIVELY Q-SWITCHING ND:GARNET LASERS
High quality GGG:Cr,Ca crystal for passive Q-switching Nd:garnet lasers has been grown by the Czochralski method. Thermal treatment of GGG crystals co-doped with Cr4+ and Ca2+ at different temperatures is investigated. The absorption spectra were resolved into different peaks, of modified Gaussian line-shape. Transition from octahedral sites to tetrahedral ones is thermally activated. An...
متن کاملOptical ASK and FSK Modulation By Using Quantum Well Transistor Lasers
In this paper, transistor lasers (TLs) are used as an optical modulator for generation of ASK(Amplitude Shift Keying) and FSK (Frequency Shift Keying) optical signals. Our analysis is based on continuity equation, rate equations, and the theory of discontinuity of quasi-fermi level at the abrupt junction. Our simulation results indicate that, the specification of ASK and FSK optical signals, ar...
متن کاملEnhanced Modulation and Noise Characteristics in 1.55 µm QD Lasers using Additional Optical Pumping
The modulation response, relative intensity noise (RIN) and frequency noise (FN) characteristics of quantum dot (QD) lasers are investigated theoretically in the presence of an external optical beam. Using small signal analysis of the rate equations for carriers and photons, it is demonstrated that by injecting excess carriers into the QDs excited state through optical pumping, the modulation r...
متن کاملLasers incorporating 2D photonic bandgap mirrors - Electronics Letters
1 MURTZ, M., PFISTER, O., MARQUARDT, J.H., STEPHENS, M., WELLS, J.S., WALTMAN, S., HOLLBERG, L., ROBINSON, H.G., FOX, R.W., MEHUYS, D., BROWN, E.R., and MCINTOSH, K.A.: ‘Nonlinear optics for optical frequency synthesis and optical divide by 3’. Proc. 5th Annual meeting of frequency standards and frequency metrology, 1995 2 LANDE, D., HEANUE, J.F., BASHAW, M.c., and HESSELINK, L.: ‘A digital wav...
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ژورنال
عنوان ژورنال: Radio and Electronic Engineer
سال: 1975
ISSN: 0033-7722
DOI: 10.1049/ree.1975.0107