# IEEE Journal of Quantum Electronics

## Filter Results

Displaying Results 1 - 25 of 58
• ### Threshold current density in strained layer InxGa1-xAs-GaAs quantum-well heterostructure lasers

Publication Year: 1992, Page(s):1983 - 1989
Cited by:  Papers (20)
| | PDF (592 KB)

The authors consider the transparency carrier density in ideal and practical strained layer InxGa1-xAs-GaAs quantum-well heterostructure lasers. The transparency carrier density in practical structures is then related to transparency current density using realistic values for spontaneous recombination rates. These parameters are incorporated with representative structural par... View full abstract»

• ### Superposed multiquantum barriers for InGaAlP heterojunctions

Publication Year: 1992, Page(s):1977 - 1982
Cited by:  Papers (6)  |  Patents (1)
| | PDF (472 KB)

In a visible-light laser using In0.5(Ga1-xAl x)0.5P (0⩽x⩽1), the conduction-band discontinuity at the interface between the active layer and clad layer is not large enough to strongly suppress carriers overflowing into the clad layer, unlike in the GaAlAs system. A multiquantum barrier (MQB) is used to overcome this problem, and the elec... View full abstract»

• ### Ultrafast carrier dynamics in III-V semiconductors grown by molecular-beam epitaxy at very low substrate temperatures

Publication Year: 1992, Page(s):2464 - 2472
Cited by:  Papers (229)  |  Patents (10)
| | PDF (944 KB)

Ultrashort carrier lifetimes were experimentally observed in a variety of As-based III-V crystalline semiconductor layers grown by molecular beam epitaxy over a range of very low substrate temperatures. Time-resolved optical absorption, reflection, and photoconductive switching measurements with femtosecond resolution have been used to directly measure the ultrafast carrier dynamics in these mater... View full abstract»

• ### Temperature insensitive SHG at 0.5321 μm in KTP

Publication Year: 1992, Page(s):1974 - 1976
Cited by:  Papers (37)
| | PDF (188 KB)

KTP has been found to have the special phase-matching loci where the temperature-induced phase mismatch becomes zero for type-1 and type-2 SHG of the Nd:YAG laser frequency at 1.0642 μm. This was demonstrated for type-1 phase matching. In addition, the temperature derivatives of the refractive indexes and the absolute value of d 33 are reported View full abstract»

• ### Ultrafast field-dependent response of bandedge photogenerated electrons in quantum-well structures

Publication Year: 1992, Page(s):2456 - 2463
Cited by:  Papers (2)
| | PDF (740 KB)

The authors analyze the field-dependent femtosecond dynamics of bandedge photogenerated electrons undergoing parallel transport in quantum-well structures. The intracollisional field effect, breakdown of the Fermi golden rule, quantization of the phonon modes, and transient charge variations are all comprehensively included. The electron heating rates at zero fields are in agreement with experimen... View full abstract»

• ### Effects of axial nonuniformity in modeling Q-switched lasers

Publication Year: 1992, Page(s):1970 - 1973
Cited by:  Papers (9)
| | PDF (276 KB)

Generic Q-switched laser pulses are calculated using a point model and a traveling wave model. Results indicate that the point model approach commonly used in rate equation modeling is inadequate for large initial inversions, large internal losses, or large fractional outcoupling. The point model typically overestimates peak power and energy and distorts the pulse shape. A simple travelin... View full abstract»

• ### Transient transverse stimulated Brillouin scattering with a broad-band pump

Publication Year: 1992, Page(s):2075 - 2083
Cited by:  Papers (5)
| | PDF (728 KB)

The threshold for stimulated Brillouin scattering (SBS), which can damage optical components and be an energy loss mechanism in high-power pulsed laser systems, can be increased by using a broadband laser or by segmenting the aperture in order to limit the interaction length. A theoretical model of transient broadband SBS is developed. The authors start by considering the case of transient SBS wit... View full abstract»

• ### Short pulse generation using multisegment mode-locked semiconductor lasers

Publication Year: 1992, Page(s):2186 - 2202
Cited by:  Papers (179)  |  Patents (15)
| | PDF (1540 KB)

Mode-locked semiconductor lasers which incorporate multiple contacting segments are found to give improved performance over single-segment designs. The functions of gain, saturable absorption, gain modulation, repetition rate tuning, wavelength tuning, and electrical pulse generation can be integrated on a single semiconductor chip. The optimization of the performance of mode-locked lasers in term... View full abstract»

• ### Pulse-modulated interferometer for measuring intensity-induced phase shifts

Publication Year: 1992, Page(s):2044 - 2050
Cited by:  Papers (11)
| | PDF (624 KB)

Single-polarization interferometric measurements of intensity-induced refractive index changes using an intensity-modulated mode-locked laser are reported. The technique is used to determine the electronic and thermal intensity-dependent index changes in a polydiacetylene waveguide. Monte Carlo analysis shows that a sensitivity of at least 0.02 rad is expected from the configuration View full abstract»

• ### Picosecond and femtosecond pulse generation in a regeneratively mode-locked Ti:sapphire laser

Publication Year: 1992, Page(s):2151 - 2162
Cited by:  Papers (52)  |  Patents (6)
| | PDF (1080 KB)

The authors have produced transform-limited pulses ranging from 100 ps to 40 fs duration from a Ti:sapphire laser. Output powers in excess of 1 W and peak powers of 0.5 MW have been observed. They describe the technique of regenerative mode locking and present evidence that a transient with a peak power of more than 10 kW is required to initiate mode locking. The role of group velocity dispersion ... View full abstract»

• ### Generation of 312 nm, femtosecond pulses using a poled copolymer film

Publication Year: 1992, Page(s):2398 - 2403
Cited by:  Papers (19)
| | PDF (476 KB)

A 2.5-μm-thick corona-poled copolymer film was used to double ~13-fs-long, 50-nJ-energy, 625-nm-wavelength pulses at a 8-kHz repetition rate. The large effective d coefficient results in a relatively high conversion efficiency for such a thin film. A maximum efficiency of 0.13% has been measured. Long-term stable operation was obtained with efficiencies of 0.025% at the damage threshol... View full abstract»

• ### Laterally coupled periodic semiconductor laser structures: Bloch function analysis

Publication Year: 1992, Page(s):2024 - 2032
Cited by:  Papers (9)
| | PDF (680 KB)

The Bloch function analysis is applied to the problem of periodical phase-locked semiconductor laser array structures. This method makes it possible to treat in the same manner both evanescent and leaky modes of such structures and to optimize these structures in order to get maximum content in the central lobe of emission far-field pattern. If one places high gain in the low-index array regions, ... View full abstract»

• ### THz time-domain spectroscopy of nonpolar liquids

Publication Year: 1992, Page(s):2518 - 2522
Cited by:  Papers (88)  |  Patents (6)
| | PDF (460 KB)

A newly developed terahertz time-domain spectrometer based on photoconductive dipole antennas driven by femtosecond laser pulses was used to measure the absorption and index of refraction for benzene, carbon tetrachloride, and cyclohexane in the far infrared. The spectra cover the region of 3-66 cm-1, where the dielectric response of the nonpolar liquids is dominated by collision induce... View full abstract»

• ### Transient carrier and field dynamics in quantum-well parallel transport: From the ballistic to the quasi-equilibrium regime

Publication Year: 1992, Page(s):2445 - 2455
Cited by:  Papers (34)
| | PDF (1112 KB)

Femtosecond optical techniques have been used to probe transient electron transport and electric field dynamics in high field parallel transport, in a horizontal p-i-n quantum-well structure. Physical quantities associated with transport transients, such as electron distribution functions, electron velocity, and electron acceleration, have been measured by means of femtosecond absorption saturatio... View full abstract»

• ### High-speed coplanar transmission lines

Publication Year: 1992, Page(s):2333 - 2342
Cited by:  Papers (28)
| | PDF (796 KB)

The authors present measurements of picosecond pulse propagation on coplanar strip transmission lines for which speed (i.e., group velocity), as well as phase and amplitude information are measured. Electrode effects are studied using transmission line loops 1 mm in diameter with cumulative propagation distances as long as 6 cm. The intrinsically low dielectric constant of coplanar-air transmissio... View full abstract»

• ### Temporal and radial evolution of the populations of CuI levels in the CuBr vapor laser

Publication Year: 1992, Page(s):1966 - 1969
Cited by:  Papers (21)
| | PDF (268 KB)

Populations of CuI ground state, resonance, and metastable levels have been measured in CuBr laser with and without hydrogen additives. Temporal evolution and spatial distribution populations have been studied during the excitation pulse and also during the interpulse period of time. Addition of hydrogen results in a smaller rate of resonance and metastable levels excitation and smaller depopulati... View full abstract»

• ### Simplified characterization of uniaxial and biaxial nonlinear optical crystals: a plea for standardization of nomenclature and conventions

Publication Year: 1992, Page(s):2057 - 2074
Cited by:  Papers (269)  |  Patents (1)
| | PDF (1656 KB)

Standards which eliminate ambiguity in reporting nonlinear phenomena, especially in the increasingly complex realm of biaxial crystals, are proposed. In order to restore uniformity to the designation of crystallographic axes and crystal tensor properties, adoption of IEEE/ANSI Std. 176, with a small but much needed modification for crystal class mm2, is recommended. For the reporting of nonlinear ... View full abstract»

• ### Monolithic colliding-pulse mode-locked quantum-well lasers

Publication Year: 1992, Page(s):2176 - 2185
Cited by:  Papers (140)  |  Patents (7)
| | PDF (912 KB)

Integration of the whole mode-locked laser onto a single piece of semiconductor offers a number of advantages, including total elimination of optical alignment processes, improved mechanical stability, and the generation of short optical pulses at much higher repetition frequencies. Semiconductor laser processing technologies were used to implement the colliding-pulse mode-locking (CPM) scheme, wh... View full abstract»

• ### Field-induced coupled quantum-well oscillators

Publication Year: 1992, Page(s):2039 - 2043
Cited by:  Papers (2)
| | PDF (404 KB)

A study of field-induced coupled quantum-well oscillators due to the interwell coherent oscillation is presented. The evolution of an electron wave packet in an asymmetric coupled quantum-well structure is described by the application of the time-development operator of the time-dependent Schrodinger equation. By adjusting the applied field, various resonant conditions giving rise to different osc... View full abstract»

• ### Femtosecond dynamic exciton bleaching in room temperature II-VI quantum wells

Publication Year: 1992, Page(s):2535 - 2542
Cited by:  Papers (5)
| | PDF (704 KB)

Femtosecond optical pulses of 14-fs duration were used to investigate exciton dynamics in II-VI CdZnTe-ZnTe multiple quantum wells, at room temperature. An exciton ionization time of 110 fs was determined. The bleaching strength of cold' neutral excitons on excitons is found to be larger than that from the same density of cool' free electron-hole pairs View full abstract»

• ### Variable bandwidth birefringent filter for stable femtosecond lasers

Publication Year: 1992, Page(s):2142 - 2150
Cited by:  Papers (19)
| | PDF (756 KB)

A design for a birefringent filter is described, which is suitable for tunable femtosecond lasers. Using a single plate, which has a steeply diving optic axis, two-octave tunability is attained with negligible deterioration of the stopband rejection. For a specific wavelength region, it means that the filter's bandwidth can be changed by a factor of four. Another characteristic of the design is th... View full abstract»

• ### Second harmonic generation in plasmas produced by intense femtosecond laser pulses

Publication Year: 1992, Page(s):2388 - 2397
Cited by:  Papers (34)
| | PDF (916 KB)

Plasmas were produced by tightly focusing femtosecond laser pulses onto the surface of metal films and glass targets. A relatively intense, well-collimated second harmonic could be observed in the specular direction. The conversion efficiency reached 10-4 for focused intensities around 1016 W/cm2. Detailed measurements of the angular dependence, the polarization pr... View full abstract»

• ### Analysis of the blazing effect in second-order gratings

Publication Year: 1992, Page(s):2016 - 2023
Cited by:  Papers (18)  |  Patents (3)
| | PDF (660 KB)

The validity of the blazing effect for improving the output-coupling efficiency of second-order gratings for use in grating-coupled surface-emitting lasers is examined. The Floquet-Bloch expansion method is used for the analysis of finite-length gratings with asymmetric tooth shapes operated in resonance condition. It is shown that for saw-tooth gratings the blazing effect is almost lost around th... View full abstract»

• ### Ultrafast solid-state mode-locked lasers using resonant nonlinearities

Publication Year: 1992, Page(s):2123 - 2133
Cited by:  Papers (39)  |  Patents (2)
| | PDF (1000 KB)

The authors discuss recent experiments in which resonant nonlinearities are used in order to directly mode lock solid-state lasers or to initiate self-focusing mode locking. Three configurations using resonant nonlinearities are considered. They are coupled cavity mode locking using a semiconductor nonlinear mirror, a further extension of this including self-focusing mode locking, and the closely ... View full abstract»

• ### Accumulated photon echoes on doped fibers

Publication Year: 1992, Page(s):2369 - 2381
Cited by:  Papers (14)
| | PDF (1016 KB)

Accumulated photon echo experiments in erbium-doped optical fibers are reviewed. The experiments demonstrate the advantage of the single-mode optical fibers for investigations of resonant coherent effects. A theoretical analysis of the accumulated echo process which is particularly suitable for the highly saturated, highly absorptive experiments in fibers is presented. The capability of ultrafast ... 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