Zobrazeno 1 - 10
of 32
pro vyhledávání: '"M. L. Bortz"'
Publikováno v:
Journal of Applied Physics. 82:998-1005
Quasi-phase-matched waveguides are known to degrade when generating high intensity short wavelength light. Photoinduced changes in the refractive indices can lead to reduced efficiency by broadening phase-matching curves or inducing power dependent l
Publikováno v:
Electronics and Communications in Japan (Part II: Electronics). 78:20-27
Recently, the conversion efficiency of waveguide quasi-phasematched second-harmonic generation (SHG) devices has improved rapidly so that factors other than conversion efficiency now limit the utility of these devices. One practical problem is the na
Publikováno v:
IEEE Journal of Quantum Electronics. 30:2953-2960
We report the demonstration of dimensional noncritical phase matching, a phase-matched interaction length exceeding 10 mm, and an internal conversion efficiency of 204%/W for second harmonic generation of 976 nm radiation in a periodically poled, ann
Publikováno v:
Optics letters. 18(21)
We experimentally demonstrate a 240-fold increase in the efficiency of an AlGaAs/AlAs surface-emitting second-harmonic generation device by embedding the waveguide core in a monolithic vertical resonant cavity. Calculations indicate that conversion e
Autor:
M. L. Bortz, Martin M. Fejer
Publikováno v:
Optics letters. 16(23)
We report characterization of annealed proton-exchanged waveguides in LiNbO(3). Effective-mode indices and fundamental-mode intensity profiles were measured for a variety of fabrication conditions. Index profile, depth, and surface refractive-index c
Publikováno v:
Physica Scripta. 41:537-541
We have studied the room temperature optical reflectivity of MgO, MgAl2O4, and α-Al2O3 from 5 to 40eV using a novel spectrophotometer with a laser plasma light source. Structure in the imaginary component of the dielectric response is analysed using
Autor:
M. L. Bortz, R. H. Hammond, S. B. Arnason, Weizhi Wang, Martin M. Fejer, M. R. Beasley, T. Day
Publikováno v:
Applied Physics Letters. 71:31-33
A direct measurement of atomic flux in e-beam evaporated yttrium has been demonstrated with a diode-laser-based atomic absorption (AA) monitor at 668 nm. Atomic number density and velocity were measured through absorption and Doppler shift measuremen
Autor:
M. R. Beasley, Chong H. Ahn, T. Day, Weizhi Wang, Robert Hammond, M. L. Bortz, Martin M. Fejer
Publikováno v:
Applied Physics Letters. 68:729-731
A monitor for Al vapor density based on atomic absorption (AA) using a frequency‐doubled external‐cavity‐diode‐laser source at 394 nm has been demonstrated in both evaporation and sputtering processes. Closed loop operation was achieved for e
Autor:
Chong H. Ahn, Robert Hammond, M. L. Bortz, M. D. Levenson, M. R. Beasley, Weizhi Wang, Martin M. Fejer
Publikováno v:
Applied Physics Letters. 67:1375-1377
We have developed an atomic monitoring system for physical vapor deposition process control based on a frequency‐modulation (FM) spectroscopy scheme using a 670 nm external cavity diode laser. FM detection made it possible to measure absorption as
Autor:
J. F. Gibbons, M. J. Angell, J. L. Hoyt, R. M. Emerson, M. L. Bortz, Martin M. Fejer, L. A. Eyres
Publikováno v:
Applied Physics Letters. 64:3107-3109
We present a technique for fabricating laterally patterned 〈111〉 and 〈100〉‐oriented regions of CdTe on GaAs by metalorganic chemical vapor deposition. Patterning of the crystal orientation is important for quasi‐phase‐matched nonlinear