# IEEE Journal of Quantum Electronics

## Filter Results

Displaying Results 1 - 25 of 34
• ### Relation between the cavity detuning and the output optical intensity in free-electron lasers

Publication Year: 1991, Page(s):903 - 907
Cited by:  Papers (2)
| | PDF (332 KB)

The authors use a simple model of saturation in free-electron lasers operating with pulsed beams to study the intensity growth as a function of the cavity mismatch and of the coupling parameter. In spite of the simplicity of the model, the dependence of the intracavity power, as a function of the cavity detuning, is reproduced remarkably well. It is also pointed out that an enhancement of the opti... View full abstract»

• ### Research about the behavior of electrons in thermionic field emission microwave guns

Publication Year: 1991, Page(s):898 - 902
Cited by:  Papers (2)
| | PDF (268 KB)

A revision of the variable total particle number of the PARMELA program is presented to fit the characteristics of a thermionic field emission cathode. The longitudinal space-charge spread and transverse space-charge effects are obviously changed. The trajectories, energy spectra, and time structure of the output currents with and without transverse magnetic fields were studied. The backbombarding... View full abstract»

• ### Correlation between 1/f fluctuations in the two output beams of a laser diode

Publication Year: 1991, Page(s):931 - 936
Cited by:  Papers (4)
| | PDF (412 KB)

The coherence function of 1/f noise fluctuations in the optical output from the two laser facets is derived from a simple model. At low power, the coherence is shown to be dependent on the optical absorption in thermal equilibrium. The coherence function can be used to determine the absorption coefficient. In the superradiation region, the coherence function increases strongly with power ... View full abstract»

• ### Relaxation oscillations in distributed feedback gas lasers

Publication Year: 1991, Page(s):886 - 890
Cited by:  Papers (3)
| | PDF (384 KB)

A systematic study of the relaxation oscillations in a waveguide distributed feedback gas laser equipped with a metal waveguide of rectangular cross section is presented. Approximate formulas for weak as well as strong coupling regions relating the damping rate and frequency of the relaxation oscillations to the structure parameters for this kind of laser are derived. The influence of the gain sat... View full abstract»

• ### Liquid-nitrogen-cooled Ti:Al2O3 laser

Publication Year: 1991, Page(s):1039 - 1047
Cited by:  Papers (53)  |  Patents (1)
| | PDF (916 KB)

At 93 K, sapphire (Al2O3) has much better thermal properties than at room temperature. By taking advantage of the improved thermal properties, a Ti:Al2O3 laser was operated with 350 W of output power under thermal steady-state conditions. Model calculations of thermal lensing and higher order thermooptic aberrations indicate that the output power capabil... View full abstract»

• ### Tunable laser pumped 3 μm Ho:YAlO3 laser

Publication Year: 1991, Page(s):895 - 897
Cited by:  Papers (11)
| | PDF (264 KB)

The tuning characteristics of the 5I6 -5I7 transition in a Ho:YAlO3 laser, intracavity pumped by a 1.079 μm Nd:YalO3 laser, were studied. Operation on seven distinct lines between 2.844 and 3.017 μm was found, and the threshold and relative slope efficiency of each line was measured. Several of these lines we... View full abstract»

• ### Waveguiding effect on modal gain in optical waveguide devices

Publication Year: 1991, Page(s):884 - 885
Cited by:  Papers (9)
| | PDF (180 KB)

The waveguiding effect on modal gain in narrowly confined structures in optical waveguide devices, such as semiconductor laser diodes, is discussed. It is shown that a difference exists between the rigorous modal gain derived from the wave equation and the approximate modal gain used in the literature. This difference means that there is an enhancement of the rigorous modal gain, which depends on ... View full abstract»

• ### Spectroscopy and laser operation of Nd:ZBAN glass

Publication Year: 1991, Page(s):1031 - 1038
Cited by:  Papers (26)
| | PDF (580 KB)

The results of a study of the spectroscopic and laser properties of a Nd3+ doped fluoride glass are presented. Threshold energies and slope efficiencies are reported along with the stimulated emission cross section for the laser transition. The effect of excited state absorption of pump photons on the slope efficiency is investigated View full abstract»

• ### Modal discrimination in leaky-mode (antiguided) arrays [diode lasers]

Publication Year: 1991, Page(s):921 - 930
Cited by:  Papers (14)  |  Patents (1)
| | PDF (872 KB)

Presents on the fabrication of a ten-element antiguided (leaky-mode) diode laser array that operates in an in-phase mode with a diffraction-limited far-field pattern at drive currents up to 8.7 times the threshold current (pulsed) and an output power of 400 mW (both facets). This device evidences good discrimination against the out-of-phase leaky mode without the benefit of a Talbot' spatial filt... View full abstract»

• ### Wavelength selective detection using excitonic resonances in multiquantum-well structures

Publication Year: 1991, Page(s):875 - 877
Cited by:  Papers (5)
| | PDF (240 KB)

The wavelength and voltage dependence of photocurrent near excitonic resonances are used to study the wavelength selectivity of p-i(multiple quantum well, or MQW)-n photodiode structures with a parallel sequence of optical bits, each with a different wavelength. The selectivity is considered good if the state of a λi wavelength bit can be detected regardless of λj View full abstract»

• ### Whispering-gallery laser resonators. I. Diffraction of whispering-gallery modes

Publication Year: 1991, Page(s):1069 - 1077
Cited by:  Papers (18)
| | PDF (752 KB)

Whispering-gallery optics for use at soft X-ray and extreme ultraviolet wavelengths are examined for their potential applications in laser resonators. An examination is made of beam divergence at the exit of a whispering gallery resonator. The properties of whispering-gallery eigenmodes are reviewed, and the features of their Fourier transforms discussed. The Fraunhofer approximation is then used ... View full abstract»

• ### Choice of clip levels for beam width measurements using knife-edge techniques

Publication Year: 1991, Page(s):1098 - 1104
Cited by:  Papers (24)  |  Patents (4)
| | PDF (596 KB)

The scanning knife-edge technique provides a method for measuring the width of an optical beam having an arbitrary or irregular transverse profile. To implement this method, however, it is necessary to select both a clip level and a scale factor for converting the measured clip width into an effective width of the laser beam. The authors show that the preferred clip level for beam width measuremen... View full abstract»

• ### Parametric four-photon mixing followed by stimulated Raman scattering with optical pulses in birefringent optical fibers

Publication Year: 1991, Page(s):1011 - 1021
Cited by:  Papers (13)
| | PDF (912 KB)

An analysis into the phase matching condition of four-photon mixing in birefringent optical fibers is presented. The analysis yields six independent parametric processes. Some of the associated frequency shifts show a dependence on the fiber birefringence, allowing the authors to obtain constraints under which the parametric Stokes pulse will fall within the Raman gain band to undergo subsequent R... View full abstract»

• ### Integral equation analysis for higher order modes and cutoff frequencies of arbitrary profiles

Publication Year: 1991, Page(s):976 - 984
Cited by:  Papers (3)
| | PDF (724 KB)

A semianalytical method of analysis for arbitrary weakly guiding circular and noncircular profiles, which has its fundamental basis in perturbation theory and incorporates Green's function and integral equation techniques in a powerful method of analysis possessing extremely high accuracy, is extended to the analysis of higher order modes and cutoff frequencies of arbitrary weakly guiding circular... View full abstract»

• ### Nonlinear refractive index in erbium doped optical fiber: Theory and experiment

Publication Year: 1991, Page(s):908 - 913
Cited by:  Papers (103)  |  Patents (8)
| | PDF (328 KB)

An intensity-dependent refractive index in erbium doped optical fiber has been observed for the first time. The effect has been observed by an interferometric technique using a two-core fiber. The effect is analyzed theoretically, and the important nonlinear parameters for thin material have been determined and are presented View full abstract»

• ### Exact correlation functions for non-Markovian laser phase fluctuations

Publication Year: 1991, Page(s):863 - 868
Cited by:  Papers (3)
| | PDF (448 KB)

A new model describing laser noise in terms of non-Markovian stochastic phase jumps has been introduced by A.G. Kofman et al. (1988, 1990). An exact expression for the correlation function for the electric field is obtained. This expression, valid for all possible values of the parameters of the stochastic process, reduces to approximations reported by B.R. Mollow (1969). A procedure is described ... View full abstract»

• ### Peaking capacitor in an incomplete corona surface discharge preionized TEA CO2 laser

Publication Year: 1991, Page(s):891 - 894
Cited by:  Papers (12)
| | PDF (296 KB)

The peaking capacitor's role in ionization processes is clarified. The preionization discharge is found to be essentially independent of the peaking capacitor. It is shown that the peaking discharge current flows through the laser main gap. The influence of the peaking capacitor on the gas mixture optimization, is discussed View full abstract»

• ### Active mode locking of broad band continuous-wave lasers

Publication Year: 1991, Page(s):1048 - 1060
Cited by:  Papers (13)
| | PDF (1124 KB)

The authors extend D.J. Kuizenga and A.E. Siegman's theory (1970) on active mode locking to the case of broad bandwidth continuous-wave (CW) tunable lasers; in particular, the authors analyze the effects of intracavity group-velocity dispersion and bandwidth control caused by intracavity optical elements, such as the solid-state hosts of the gain medium, modulators, and birefringent tuning filters... View full abstract»

• ### Dynamical properties of a laser diode with optical feedback from an external high-finesse resonator

Publication Year: 1991, Page(s):937 - 945
Cited by:  Papers (7)
| | PDF (628 KB)

The effect of coupling optically a laser diode to a high-finesse external resonator is described. The authors take into account multiple roundtrips in the external cavity and the carrier finite life-time in the diode laser. The rate equations are studied analytically. Steady states are obtained and their stability determined. Numerical resolution of the equations leads to predicting self-pulsing m... View full abstract»

• ### A refined WKB method for symmetric planar waveguides with truncated-index profiles and graded-index profiles

Publication Year: 1991, Page(s):878 - 883
Cited by:  Papers (8)
| | PDF (316 KB)

An accurate method is proposed, based on a modified version of the WKB method in quantum mechanics, for evaluating the propagation constants and field distribution of symmetric planar waveguides with a truncated-index and graded-index profile. Simple formulas are given for calculating the dispersion characteristics including those for the truncated parabolic and exponential profile, and results ar... View full abstract»

• ### Free-electron lasers with very slow wiggler taper

Publication Year: 1991, Page(s):1078 - 1089
Cited by:  Papers (2)
| | PDF (724 KB)

A highly accurate, explicit asymptotic solution of the electron energy and phase is found for a class of free-electron lasers (FELs) with very long wavelength beams, very low electron energies, and very slow taper of the wiggler field relative to the wiggler period. Dimensionless variables are defined and normalized, and three small parameters which characterize the operation of the FEL are identi... View full abstract»

• ### Comments on Femtosecond optical nonlinearities of CdSe quantum dots' by N. Peyghambarian et al

Publication Year: 1991, Page(s):1105 - 1106
Cited by:  Papers (3)
| | PDF (96 KB)

The commentators show that when the anisotropy of microcrystals is properly taken into account, the saturation intensity, the homogeneous linewidth, and the bleaching magnitude as a function of pump intensity can be obtained from the analysis of the experimental results of N. Peyghambarian et al. (see ibid., vol.25, p.2516-22, 1989) View full abstract»

• ### Understanding the formation of the SRS Stokes spectrum in fused silica fibers

Publication Year: 1991, Page(s):1022 - 1030
Cited by:  Papers (34)  |  Patents (1)
| | PDF (804 KB)

Spectral characteristics of stimulated Raman scattering (SRS) in optical fibers are examined in a regime (nanosecond pulses or longer) for which effects such a self-phase modulation, cross-phase modulation, and group velocity dispersion are negligible. An XeF excimer laser was used to pump a multimode fused silica UV optical fiber to observe SRS multiple-order Stokes generation. A theoretical mode... View full abstract»

• ### Coupled mode formulation for directional couplers with longitudinal perturbation

Publication Year: 1991, Page(s):985 - 994
Cited by:  Papers (32)
| | PDF (804 KB)

A grating-assisted directional coupler is investigated using an improved coupled-mode formulation for multi-waveguide systems with longitudinal perturbation. This approach is capable of handling three-dimensional structures as well as a complex index of refraction and nonisotropic media. The case of two coupled channel waveguides is closely examined, and a numerical analysis is carried out for sev... View full abstract»

• ### Bonding stress measurements from the degree of polarization of facet emission of AlGaAs superluminescent diodes

Publication Year: 1991, Page(s):914 - 920
Cited by:  Papers (19)
| | PDF (656 KB)

Mechanical stress induced by bonding AlGaAs superluminescent diodes to Cu, SiC, or diamond heat sinks using 40% Pb-60% Sn or 80% Au-20% Sn solder has been observed using measurements of the degree of polarization of the facet emission at low current levels. Stresses up to 109 dyn/cm2 were observed, with the magnitude of the stress dependent on the solder used, and the sign of... View full abstract»

## Aims & Scope

The IEEE Journal of Quantum Electronics is dedicated to the publication of manuscripts reporting novel experimental or theoretical results in the broad field of the science and technology of quantum electronics.

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief
Prof. Hon Ki Tsang
Chinese University of Hong Kong