APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

5 Oct 1998

Volume 73, Issue 14, pp. 1925-2058

Return to All Sections
back to top
RSS Feeds

Facet roughness analysis for InGaN/GaN lasers with cleaved facets

D. A. Stocker, E. F. Schubert, W. Grieshaber, K. S. Boutros, and J. M. Redwing

Appl. Phys. Lett. 73, 1925 (1998); http://dx.doi.org/10.1063/1.122172 (3 pages) | Cited 11 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Atomic force microscope images reveal a root-mean-square roughness Δd = 16 nm for InGaN/GaN double-heterostructure laser structures with cleaved a-plane facets. The c-plane sapphire substrate cleaves cleanly along both the a and m planes. A theoretical model is developed which shows that the power reflectivity of the facets decreases with roughness by a factor of e−16π2(nΔd/λ0)2, where n is the refractive index of the semiconductor and λ0 is the emission wavelength. Laser emission from the optically pumped cavities shows a TE/TM ratio of 100, an increase in differential quantum efficiency by a factor of 34 above threshold, and an emission line narrowing to 13.5 meV. © 1998 American Institute of Physics.
Show PACS
42.55.Px Semiconductor lasers; laser diodes
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
68.35.B- Structure of clean surfaces (and surface reconstruction)
42.86.+b Optical workshop techniques
68.55.-a Thin film structure and morphology

Demonstration of an InGaN/GaN-based optically pumped multiquantum well distributed feedback laser using holographically defined third-order gratings

Daniel Hofstetter, Robert L. Thornton, Michael Kneissl, David P. Bour, and Clarence Dunnrowicz

Appl. Phys. Lett. 73, 1928 (1998); http://dx.doi.org/10.1063/1.122325 (3 pages) | Cited 8 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We demonstrate an optically pumped InGaN/GaN-based multiquantum well distributed feedback laser in the blue spectral region. The third-order grating providing feedback was defined holographically and dry etched into the upper waveguiding layer by chemically assisted ion-beam etching. When aligning the stripe-shaped pump beam either parallel or perpendicular to the grating grooves, we found a considerably lower pumping threshold, higher slope efficiency, a slightly longer emission wavelength, and a much narrower linewidth for the geometry with the pump beam orthogonal to the grating lines. A nearly constant emission wavelength of 400.85 nm and a linewidth of 0.7 Å were observed under various pump intensities. To the best of our knowledge, this is the narrowest linewidth ever reported for an optically pumped device in this material system. © 1998 American Institute of Physics.
Show PACS
42.55.Px Semiconductor lasers; laser diodes
85.35.Be Quantum well devices (quantum dots, quantum wires, etc.)
42.40.Eq Holographic optical elements; holographic gratings

Cleaved cavity stimulated emission from an optically pumped cubic GaN/AlGaN heterostructure grown on GaAs (100) substrate

J. Wu, H. Yaguchi, K. Onabe, and Y. Shiraki

Appl. Phys. Lett. 73, 1931 (1998); http://dx.doi.org/10.1063/1.122326 (3 pages) | Cited 8 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Cubic GaN/AlGaN double heterostructure was grown on semi-insulating GaAs (100) substrate by metalorganic vapor phase epitaxy. Strong stimulated emission was observed from the cleaved edge of the optically pumped cubic GaN/AlGaN heterostructure at 15 K. The cavity was formed simply by cleaving the substrate. The stimulated emission was demonstrated by the superlinear increase of the output intensity and the highly transverse electric polarized nature. The stimulated emission showed an obvious redshift compared with the spontaneous one. © 1998 American Institute of Physics.
Show PACS
78.45.+h Stimulated emission
42.55.Px Semiconductor lasers; laser diodes
78.66.Fd III-V semiconductors
42.60.By Design of specific laser systems
73.40.Kp III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions

Ultrafast optical pulse noise suppression using a nonlinear spectral filter: 23 dB reduction of fiber laser 1/f noise

Stephen R. Friberg and Susumu Machida

Appl. Phys. Lett. 73, 1934 (1998); http://dx.doi.org/10.1063/1.122327 (3 pages) | Cited 2 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Nonlinear spectral filtering provides a simple method for reducing noise in optical pulses to below the shot noise level. We show its effectiveness for excess noise reduction in an ultrafast optical pulse train by demonstrating 23 dB reduction of low frequency 1/f noise in pulses from a passively mode-locked erbium-doped fiber laser. The noise reduction is achieved by spectrally filtering pulses propagated as solitons through a 1.5 km length of optical fiber. © 1998 American Institute of Physics.
Show PACS
42.55.Wd Fiber lasers
42.60.Mi Dynamical laser instabilities; noisy laser behavior
42.79.Ci Filters, zone plates, and polarizers
42.65.Re Ultrafast processes; optical pulse generation and pulse compression
42.60.Fc Modulation, tuning, and mode locking
42.65.Tg Optical solitons; nonlinear guided waves

Normal-incidence intersubband (In, Ga)As/GaAs quantum dot infrared photodetectors

Dong Pan, Elias Towe, and Steve Kennerly

Appl. Phys. Lett. 73, 1937 (1998); http://dx.doi.org/10.1063/1.122328 (3 pages) | Cited 151 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report the device performance of normal-incidence (In, Ga)As/GaAs quantum dot intersubband infrared photodetectors. A primary intersubband transition peak is observed at the wavelength of 13 μm (E0→E1) and a secondary peak at 11 μm (E0→E2). The measured energy spacing in the conduction band of the quantum dots is in good agreement with low temperature photoluminescence measurement and calculations. A peak detectivity of 1×1010 cm Hz1/2/W at 13 μm was achieved at 40 K for these devices. © 1998 American Institute of Physics.
Show PACS
85.60.Gz Photodetectors (including infrared and CCD detectors)
07.57.Kp Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors
85.35.Be Quantum well devices (quantum dots, quantum wires, etc.)
73.61.Ey III-V semiconductors

Optically induced polarization rotations in CdTe/CdMnTe multiple quantum wells

M. Haddad, P. Leisching, R. Frey, C. Flytzanis, and J. Cibert

Appl. Phys. Lett. 73, 1940 (1998); http://dx.doi.org/10.1063/1.122329 (3 pages) | Cited 1 time

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report large polarization state rotations of a weak pulsed beam in CdTe/CdMnTe quantum wells photoinduced by intense circularly polarized pulsed pump beam. Time-resolved analysis of the effect shows that, at moderate pump fluences, the polarization state rotation is due to the combined effect of many-body interactions and spectral hole burning at early times and to photoinduced magnetization at longer ones. At higher pump fluences, space filling and degenerate four-wave mixing become important. At low pump fluences (few μJ/cm2) already the polarization rotation photoinduced at early times can be as large as a few degrees making these multiple quantum wells potential candidates for applications. © 1998 American Institute of Physics.
Show PACS
78.20.Ek Optical activity
78.66.Hf II-VI semiconductors
75.50.Pp Magnetic semiconductors
42.65.Jx Beam trapping, self-focusing and defocusing; self-phase modulation

Design of one-dimensional band-limited uniform diffusers of light

T. A. Leskova, A. A. Maradudin, I. V. Novikov, A. V. Shchegrov, and E. R. Méndez

Appl. Phys. Lett. 73, 1943 (1998); http://dx.doi.org/10.1063/1.122330 (3 pages) | Cited 5 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We present two methods for generating numerically a one-dimensional random surface, defined by the equation x3 = ζ(x1), that has a prescribed probability density function of slopes. This problem arises in the design of a diffuser that scatters light uniformly within a range of scattering angles and produces no scattering outside this range. Numerical calculations of the scattering of light from random surfaces generated by these approaches show that the scattered intensity, indeed, has a rectangular distribution as a function of the scattering angle. © 1998 American Institute of Physics.
Show PACS
42.25.Fx Diffraction and scattering
02.50.Cw Probability theory
02.60.-x Numerical approximation and analysis

Integrated optical isolator based on efficient nonreciprocal radiation mode conversion

Toshihiro Shintaku

Appl. Phys. Lett. 73, 1946 (1998); http://dx.doi.org/10.1063/1.122331 (3 pages) | Cited 39 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
An integrated optical isolator is demonstrated based on efficient nonreciprocal conversion from a fundamental TM mode to a deep TE radiation mode away from the cutoff. The isolator is realized using a single-mode rib channel waveguide in Ce-substituted yttrium iron garnet, which has a very large Faraday rotation. 27 dB isolation is obtained at a wavelength of 1535 nm. © 1998 American Institute of Physics.
Show PACS
85.70.Ge Ferrite and garnet devices
78.20.Ls Magneto-optical effects
42.82.Et Waveguides, couplers, and arrays
42.65.Wi Nonlinear waveguides
75.50.Gg Ferrimagnetics
42.79.Gn Optical waveguides and couplers

Superradiant lasing from J-aggregated molecules adsorbed onto colloidal silver

Serdar Özçelik, Isin Özçelik, and Daniel L. Akins

Appl. Phys. Lett. 73, 1949 (1998); http://dx.doi.org/10.1063/1.122563 (3 pages) | Cited 18 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The picosecond time-resolved emission spectrum of the cyanine dye 1,1′-diethyl-3,3′bis-(3-sulfopropyl)-5,5′,6,6′-tetrachlorobenzimidazolocarbocyanine (also known as BIC) adsorbed onto colloidal silver was examined as a function of laser pulse energy at room temperature. BIC is found to aggregate on colloidal silver, and the number of coherently responding molecules involved in the one-exciton state (i.e., the coherence length) was estimated to involve 8–9 molecules. Lasing at a remarkably low incident pulse energy threshold was found for this system and explained in terms of a mechanism involving superradiant states created in coherently coupled adsorbed molecules that emit photons which stimulate emission from other spatially distributed superradiant states. © 1998 American Institute of Physics.
Show PACS
42.55.Mv Dye lasers
78.45.+h Stimulated emission
42.50.Nn Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems
78.66.Qn Polymers; organic compounds
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close