# IEEE Journal of Quantum Electronics

## Filter Results

Displaying Results 1 - 21 of 21

Publication Year: 2004, Page(s):c1 - c4
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• ### IEEE Journal of Quantum Electronics publication information

Publication Year: 2004, Page(s): c2
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• ### Attenuation inner-window in the amplifier- and modulator-integrated laser diode

Publication Year: 2004, Page(s):1631 - 1633
Cited by:  Papers (1)
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To better control the input power of an amplifier, which is monolithically integrated with an electroabsorptive-modulated laser, an inner window is implemented by removing a section of the waveguide to realize an attenuator. It also reduces the effect of amplified spontaneous emission on the integrated laser. Attenuation around -10 dB is obtained by adjusting the length of the inner window. Becaus... View full abstract»

• ### High-power and high-temperature operation of Mg-doped AlGaInP-based red laser diodes

Publication Year: 2004, Page(s):1634 - 1638
Cited by:  Papers (29)
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This paper reports on high-power and high-temperature operation of an AlGaInP-based high-power red laser diode with magnesium (Mg)-doped quaternary-alloy cladding layer. The use of Mg dopant with small diffusion coefficient enables abrupt doping profiles as well as high carrier concentrations when compared to conventional zinc (Zn) dopant. It was also found that the metal-organic vapor phase epita... View full abstract»

• ### State filling in InAs quantum-dot laser structures

Publication Year: 2004, Page(s):1639 - 1645
Cited by:  Papers (18)
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We have measured the passive modal absorption, modal gain, and spontaneous emission spectra of a quantum-dot system where the inhomogeneous broadening is sufficiently small so that the ground- and excited-state transitions can be spectrally resolved. Absorption by ground- and excited-state transitions is in the ratio 1:1.88 which is close to the ratio of 2 expected for dots with similar dimensions... View full abstract»

• ### Rate-equation model for coupled-cavity surface-emitting lasers

Publication Year: 2004, Page(s):1646 - 1656
Cited by:  Papers (18)  |  Patents (6)
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We present a detailed theoretical study of a vertical-cavity surface-emitting laser (VCSEL) with two optically coupled, active cavities. The study is based on a rate-equation model written for carriers and photons under steady-state conditions. The model allows one to determine all the relevant parameters-carrier densities, gains, and output powers-starting from two input parameters: the injection... View full abstract»

• ### Absorption and single-pass gain measurements in optically pumped type-II midinfrared laser structures

Publication Year: 2004, Page(s):1657 - 1662
Cited by:  Papers (5)
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A single-pass method was employed to measure the gain and absorption in optically pumped midinfrared type-II semiconductor lasers. The technique requires minimal sample processing and allows a single sample to be used for both absorption and gain measurements. The gain measurements confirm previous observations that the differential gain of these structures drops off rapidly with increasing temper... View full abstract»

• ### Theoretical and experimental study of optical gain and linewidth enhancement factor of type-I quantum-cascade lasers

Publication Year: 2004, Page(s):1663 - 1674
Cited by:  Papers (36)
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A theoretical and experimental study of the optical gain and the linewidth enhancement factor (LEF) of a type-I quantum-cascade (QC) laser is reported. QC lasers have a symmetrical gain spectrum because the optical transition occurs between conduction subbands. According to the Kramers-Kronig relation, a zero LEF is predicted at the gain peak, but there has been no experimental observation of a ze... View full abstract»

• ### Efficiency improvement of AlGaInN LEDs advanced by ray-tracing analysis

Publication Year: 2004, Page(s):1675 - 1686
Cited by:  Papers (25)
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A modified ray-tracing model is applied to analyze the dependence of external quantum efficiency and far-field radiation pattern of AlGaInN light-emitting diodes (LEDs) on various device parameters. Considerable increase (about 1.5 times) in the efficiency is predicted for LEDs with highly reflective p-contact as compared to those with the semitransparent p-contact. It is shown that the LED's effi... View full abstract»

• ### Characterization of optical nonlinearity in semiconductor photodiodes using cross-polarized autocorrelation

Publication Year: 2004, Page(s):1687 - 1694
Cited by:  Papers (3)
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We study the various nonlinear effects produced during the detection of high-intensity signals in semiconductor photodiodes. Experimental results on few commercial detectors are compared with theoretical analysis. This analysis is based on the tensor coefficients from second- and third-order optical nonlinearities. Both contributions are measured using collinear orthogonally polarized beams in a p... View full abstract»

• ### Quasi-direct UV/blue GaP avalanche photodetectors

Publication Year: 2004, Page(s):1695 - 1699
Cited by:  Papers (13)  |  Patents (1)
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GaP avalanche photodiodes, with thin device layers have been processed, utilizing both p-i-n and recessed window p-i-n structures, as well as a Schottky structure. The results showed low dark currents, good quantum efficiency (QE), and high gains up to 103, with good uniformity across the wafer. The peak QE at 440 nm indicated Γ-valley absorption, rather than band-edge absorption.... View full abstract»

• ### End-pumped Nd:YAG laser with self-adaptive compensation of the thermal lens

Publication Year: 2004, Page(s):1700 - 1703
Cited by:  Papers (7)
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Thermally induced lenses are the most critical problem in the development of high-power solid-state lasers. To compensate for thermal lenses, we have been investigating self-adaptive compensation methods based on thermal effects themselves. Recently, we demonstrated a novel compensation scheme for transversally pumped lasers. This scheme has now been adapted to an end-pumped laser system. The redu... View full abstract»

• ### Evidence of enhanced hypersensitive transition in erbium-doped fibers with different Al2O3 content

Publication Year: 2004, Page(s):1704 - 1708
Cited by:  Papers (3)
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Precise spectroscopic absorption measurements of erbium-doped aluminosilicate fibers with different Al2O3 content were performed with the Judd-Ofelt analysis. From the Judd-Ofelt analysis, the Ω2 parameters of Er3+ ions in these fibers were found to be about three times as large as those in aluminosilicate bulk glasses. The enhancement of the &Omeg... View full abstract»

• ### The impact of CMP and underlying back-end topographical features on losses in deposited dielectric waveguides

Publication Year: 2004, Page(s):1709 - 1714
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The bending losses in rectangular dielectric waveguides deposited on a chemical mechanical polished (CMP) surface above the metal interconnect/interlayer dielectric stack of a processed Si wafer are modeled and estimated. CMP efficiently removes local topography and microroughness, but leaves long-range surface profile undulations due to variations in the metal pattern density. These surface undul... View full abstract»

• ### Tunable waveguide transmission gratings based on active gain control

Publication Year: 2004, Page(s):1715 - 1724
Cited by:  Papers (17)
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Mode loss or gain can have a significant effect on the operation of waveguide transmission gratings as optical filters. Taking for example a long-period grating (LPG), we present a computer simulation that accounts for these effects. We show that cladding loss or gain result in qualitatively different LPG spectral behavior that can be used as a tuning mechanism in guiding structures where cladding... View full abstract»

• ### Control of center wavelength in reflective-arrayed waveguide-grating multiplexers

Publication Year: 2004, Page(s):1725 - 1731
Cited by:  Papers (3)
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A new approach to compensate for the channel-wavelength shift due to fabrication errors and thermal effects in arrayed waveguide-grating multiplexers is described. The method combines a silica-based reflective multiplexer with a composite mirror made of materials with different coefficients of thermal expansion. Differential thermal expansion of the mirror assembly rotates its reflecting surface a... View full abstract»

• ### Ambiguity functions of laser-based chaotic radar

Publication Year: 2004, Page(s):1732 - 1738
Cited by:  Papers (19)
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The ambiguity functions of a newly developed laser-based chaotic radar (CRADAR) system are studied. In the CRADAR system, the chaotic waveforms can be generated either by an optically injected (OI) semiconductor laser, or a semiconductor laser with optoelectronic feedback (OEF). The ambiguity functions of the chaotic pulsation and chaotic oscillation waveforms obtained experimentally from the CRAD... View full abstract»

• ### Design of a compact, optically guided, pinched, megawatt class free-electron laser

Publication Year: 2004, Page(s):1739 - 1743
Cited by:  Papers (9)
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A conceptual design for a compact megawatt class free-electron laser (FEL) operating at 1 μm is presented. The proposed FEL consists of an optically guided, pinched amplifier configuration driven by a RF linac. The gain length, efficiency, electron pulse slippage, and the distance between the wiggler and first relay mirror are determined for a megawatt class design. Of particular concern in the... View full abstract»

• ### Corrections to “Wavelength Conversions in Quasi-Phase Matched LiNbO$_3$Waveguide Based on Double-Pass Cascaded$chi^(2)$SFG+DFG Interactions”

Publication Year: 2004, Page(s):1744 - 1
Cited by:  Papers (10)
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• ### 2004 Index

Publication Year: 2004, Page(s):1745 - 1778
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• ### IEEE Journal of Quantum Electronics information for authors

Publication Year: 2004, Page(s): c3
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## 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