Optoelectronics:
Gespeichert in:
| Hauptverfasser: | , |
|---|---|
| Format: | Buch |
| Sprache: | English French |
| Veröffentlicht: |
Cambridge [u.a.]
Cambridge Univ. Press
2002
|
| Ausgabe: | 1. publ. in English |
| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | XVI, 725 S. Ill., graph. Darst. |
| ISBN: | 0521778131 0521771293 |
Internformat
MARC
| LEADER | 00000nam a2200000 c 4500 | ||
|---|---|---|---|
| 001 | BV014089846 | ||
| 003 | DE-604 | ||
| 005 | 20050110 | ||
| 007 | t | ||
| 008 | 020114s2002 ad|| |||| 00||| eng d | ||
| 020 | |a 0521778131 |9 0-521-77813-1 | ||
| 020 | |a 0521771293 |9 0-521-77129-3 | ||
| 035 | |a (OCoLC)248358373 | ||
| 035 | |a (DE-599)BVBBV014089846 | ||
| 040 | |a DE-604 |b ger |e rakwb | ||
| 041 | 1 | |a eng |h fre | |
| 049 | |a DE-20 |a DE-703 |a DE-1050 |a DE-91 |a DE-355 |a DE-19 |a DE-83 | ||
| 050 | 0 | |a TA1750 | |
| 082 | 0 | |a 621.381/045 |2 21 | |
| 084 | |a UH 5500 |0 (DE-625)145663: |2 rvk | ||
| 084 | |a ZN 5000 |0 (DE-625)157430: |2 rvk | ||
| 100 | 1 | |a Rosencher, Emmanuel |e Verfasser |4 aut | |
| 240 | 1 | 0 | |a Optoélectronique |
| 245 | 1 | 0 | |a Optoelectronics |c Emmanuel Rosencher ; Borge Vinter |
| 250 | |a 1. publ. in English | ||
| 264 | 1 | |a Cambridge [u.a.] |b Cambridge Univ. Press |c 2002 | |
| 300 | |a XVI, 725 S. |b Ill., graph. Darst. | ||
| 336 | |b txt |2 rdacontent | ||
| 337 | |b n |2 rdamedia | ||
| 338 | |b nc |2 rdacarrier | ||
| 650 | 4 | |a Dispositifs optoélectroniques | |
| 650 | 4 | |a Optoélectronique | |
| 650 | 4 | |a Optoelectronic devices | |
| 650 | 4 | |a Optoelectronics | |
| 650 | 0 | 7 | |a Optoelektronik |0 (DE-588)4043687-1 |2 gnd |9 rswk-swf |
| 689 | 0 | 0 | |a Optoelektronik |0 (DE-588)4043687-1 |D s |
| 689 | 0 | |5 DE-604 | |
| 700 | 1 | |a Vinter, Borge |e Verfasser |4 aut | |
| 856 | 4 | 2 | |m Digitalisierung UB Regensburg |q application/pdf |u http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=009651760&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |3 Inhaltsverzeichnis |
| 943 | 1 | |a oai:aleph.bib-bvb.de:BVB01-009651760 | |
Datensatz im Suchindex
| _version_ | 1809403459304161280 |
|---|---|
| adam_text |
Contents
Preface
xv
Properties of common semiconductors
xvii
Quantum mechanics of the electron
ι
1.1
Introduction
1
1.2
The postulates of quantum mechanics
1
1.3
The time-independent
Schrödinger
equation
6
1.3.1
Stationary states
6
1.3.2
Calculation of stationary states in a one-dimensional potential
7
1.4
The quantum well
8
1.4.1
The general case
8
1.4.2
The infinite square well
14
1.5
Time-independent perturbation theory
15
1.6
Time-dependent perturbations and transition probabilities
18
1.6.1
The general case
18
1.6.2
Sinusoidal perturbation
20
1.7
The density matrix
23
1.7.1
Pure quantum ensembles
24
1.7.2
Mixed quantum ensembles
24
1.7.3
Density matrix and relaxation time for a two-level system
26
Complement to Chapter
1 29
l.A Problems posed by continuums: the fictitious quantum box
and the density of states
29
l.B Perturbation on a degenerate state
33
l.C The quantum confined Stark effect
37
l.D The harmonic oscillator
41
l.E Transition probabilities and
Rabi
oscillations
50
vii
viii Contents
Quantum
mechanics of the photon
56
2.1
Introduction
56
2.2
Maxwell's equations in reciprocal space
56
2.3
Properties of the Fourier transform
58
2.4
Quantization of electromagnetic waves
61
2.5
The photon
63
2.6
The coherent state
67
2.7
Black body radiation 71
Complement to Chapter
2 76
2.A Radiation field for an oscillating charge: the
Lorentz
gauge
76
2.
B Thermography
84
Quantum mechanics of electron-photon interaction 9i
3.1
Introduction
91
3.2
Dipolar interaction Hamiltonian for electrons and photons
91
3.3
Linear optical susceptibility obtained by the density matrix
93
3.4
Linear optical susceptibility: absorption and optical gain
96
3.5
The rate equations
100
3.5.1
Adiabatic approximation and corpuscular interpretation
100
3.5.2
Stimulated emission
101
3.5.3
Absorption saturation
102
3.6
Spontaneous emission and radiative lifetime
104
3.6.1
Spontaneous emission
104
3.6.2
The rate equations including spontaneous emission
109
3.7
Polychromatic transitions and Einstein's equations
110
3.8
Rate equations revisited
111
3.8.1
Monochromatic single-mode waves
112
3.8.2
Multimode monochromatic waves
113
3.8.3
Polychromatic waves
114
Complement to Chapter
3 115
3.A Homogeneous and inhomogeneous broadening: coherence of light
115
3.A.1 Homogeneous broadening
116
3.A.2 Inhomogeneous broadening
120
3.B Second-order time-dependent perturbations
123
ix Contents
З.С
Einstein
coefficients
in
two limiting cases: quasi-monochromatic
and broadband optical transitions
131
3.D Equivalence of the A
·
ρ
and
D
·
E Hamiltonians
and the
Thomas-Reiche-Kuhn
sum rule
133
Laser oscillations
139
4.1
Introduction
139
4.2
Population inversion and optical amplification
139
4.2.1
Population inversion
139
4.2.2
Optical amplification and gain saturation
141
4.3
Three- and four-level systems
143
4.4
Optical resonators and laser threshold
146
4.5
Laser characteristics
150
4.5.1
Internal laser characteristics and gain clamping
150
4.5.2
Output power
152
4.5.3
Spectral characteristics
154
4.6
Cavity rate equations and the dynamic behaviour of lasers
156
4.6.1
Damped oscillations
158
4.6.2
Laser cavity dumping by loss modulation (Q-switchingl
159
4.6.3
Mode locking
163
Complement to Chapter
4
1
67
4.A The effect of spontaneous emission and photon condensation
167
4.B Saturation in laser amplifiers
171
4.C Electrodynamic laser equations: electromagnetic foundations for
mode locking
178
4.D The Schawlow-Townes limit and Langevin-noise force
185
4.E A case study: diode pumped lasers
193
Semiconductor band structure
199
5.1
Introduction
199
5.2
Crystal structures. Bloch functions, and the Brillouin zone
199
5.3
Energy bands
204
5.4
Effective mass and density of states
206
5.5
Dynamic interpretation of effective mass and the concept of holes
210
Contents
5.6
Carrier
statistics in semiconductors
216
5.6.1
Fermi statistics and the Fermi level
216
5.6.2
Intrinsic semiconductors
221
5.6.3
Doped semiconductors
222
5.6.4
Quasi-Fermi level in a non-equilibrium system
224
Complement to Chapter
5 227
5.A The nearly free electron model
227
5.B Linear combination of atomic
orbitais:
the tight binding model
230
5.
С
Kane's
k -p
method
234
5.
D
Deep defects in semiconductors
242
Electronic properties of semiconductors
245
6.1
Introduction
245
6.2
Boltzmann's equation
245
6.3
Scattering mechanisms
251
6.4
Hot electrons
257
6.4.1
Warm electrons
257
6.4.2
Hot electrons: saturation velocity
258
6.4.3
Hot electrons: negative differential velocity
260
6.5
Recombination
261
6.6
Transport equations in a semiconductor
266
Complement to Chapter
6 271
6.A The Hall effect
271
6.B Optical phonons and the
Fröhlich
interaction
273
6.B.1 Phonons
273
6.
B.2 The
Fröhlich
interaction
280
6.C Avalanche breakdown
285
6.D Auger recombination
289
Optical properties of semiconductors
296
7.1
Introduction
296
7.2
Dipolar elements in direct gap semiconductors
296
7.3
Optical susceptibility of a semiconductor
301
7.4
Absorption and spontaneous emission
306
xi Contents
7.5 Bimolecular
recombination
coefficient
313
7.6
Conditions
for optical
amplification
in
semiconductors
316
Complement to Chapter
7 321
7.A The Franz-Keldysh-effect electromodulator
321
7.
В
Optical index of semiconductors
328
7.B.1 Mid-and far-infrared regions
329
7.B.2 Near gap regime
330
7.
С
Free-carrier absorption
333
8
Semiconductor heterostructures and quantum wells
342
8.1
Introduction
342
8.2
Envelope function formalism
344
8.3
The quantum well
350
8.4
Density of states and statistics in a quantum well
354
8.5
Optical
interband
transitions in a quantum well
358
8.5.1
Hole states in the valence bands
358
8.5.2
Optical transitions between the valence and conduction bands
359
8.6
Optical intersubband transitions in a quantum well
365
8.7
Optical absorption and angle of incidence
369
8.7.1
Summary for
interband
and intersubband transition rates
369
8.7.2
Influence of the angle of incidence
370
Complement to Chapter
8 377
8.
A Quantum wires and boxes
377
8.B
Excitons
380
8.
B.I Three-dimensional
excitons
381
8.
В.
2
Two-dimensional
excitons
385
8.C Quantum confined Stark effect and the SEED electromodulator
388
8.D Valence subbands
392
Waveguides
з%
9.1
Introduction
396
9.2
A geometrical approach to waveguides
396
9.3
An oscillatory approach to waveguides
400
9.4
Optical confinement
407
xii Contents
9.5
Interaction
between guided modes: coupled mode theory
410
Complement to Chapter
9 414
9.A Optical coupling between guides: electro-optic switches
414
9.
В
Bragg waveguides
421
9.C Frequency conversion in non-linear waveguides
427
9.C.1
TE mode
in-TE mode out
427
9.C.2
TE mode
in-TM mode out
432
9.
D
Fabry-Pérot
cavities and Bragg reflectors
434
9.D.1 The
Fabry-Pérot
cavity
437
9.D.2 Bragg mirrors
442
10
Elements of device physics
447
ЮЛ
Introduction
447
10.2
Surface phenomena
448
10.3
The Schottky junction
451
10.4
The
p
-п
junction
456
Complement to Chapter
10 466
10.
A A few variants of the diode
466
10.A.1
p
-п
heterojunction diode
466
10.A.2 The p-i-n diode
467
10.B Diode leakage current
470
11
Semiconductor photodetectors
475
11.1
Introduction
475
11.2
Distribution of carriers in a photoexcited semiconductor
475
11.3
Photoconductors
481
11.3.1
Photoconduction
gain
481
11.3.2
Photoconductor detectivity
484
11.3.3
Time response of a photoconductor
486
11.4
Photovoltaic detectors
488
11.4.1
Photodiode
detectivity
492
11.4.2
Time response of
a photodiode
494
11.5
Internal emission photodetector
497
11.6
Quantum well photodetectors (QWIPs)
500
11.7
Avalanche photodetectors
509
xiii Contents
Complement to Chapter
11 513
11.
A Detector noise
513
11.
A.I Fluctuations
514
11.A.2 Physical origin of noise
518
1
1.A.3 Thermal noise
518
11.A.4 Generation-recombination noise
521
11.
A.
5
Multiplication noise
525
1
l.B Detectivity limits: performance limits due to background (BLIP)
530
12
Optical frequency conversion
538
12.1
Introduction
538
12.2
A mechanical description for second harmonic frequency generation
538
12.3
An electromagnetic description of quadratic non-linear
optical interaction
543
12.4
Optical second harmonic generation
546
12.5
Manley-Rowe relations
550
12.6
Parametric amplification
551
12.7
Optical parametric oscillators (OPOs)
554
12.7.1
Simply resonant optical parametric oscillators (SROPOs)
554
12.7.2
Doubly resonant optical parametric oscillator (DROPO)
557
12.8
Sum frequency, difference frequency, and parametric oscillation
560
Complement to Chapter
12 565
12.
A A quantum model for quadratic non-linear susceptibility
565
12.B Methods for achieving phase matching in semiconductors
572
12.
B.I
Biréfringent
phase matching
573
12.
B.
2
Quasi-phase matching
579
12.C Pump depletion in parametric interactions
582
12.
D
Spectral and temporal characteristics of optical parametric
oscillators
587
12.
E
Parametric interactions in laser cavities
596
12.F Continuous wave optical parametric oscillator characteristics
602
12.F.1 Singly resonant
ΟΡΟ
603
12.F.2 Doubly resonant
ΟΡΟ:
the balanced DROPO
608
12.F.3 Doubly resonant
ΟΡΟ:
the general case
610
xiv Contents
13 Light
emitting diodes and laser diodes
біз
13.1
Introduction
613
13.2
Electrical injection and non-equilibrium carrier densities
613
13.3
Electroluminescent diodes
617
13.3.1
Electroluminescence
617
13.3.2
Internal and external efficiencies for
LEDs 619
13.3.3
A few device issues
623
13.4
Optical amplification in heterojunction diodes
624
13.5
Double heterojunction laser diodes
629
13.5.1
Laser threshold
629
13.5.2
Output power
634
13.6
Quantum well laser diodes
637
13.6.1
Optical amplification in a quantum well structure: general case
637
13.6.2
Transparency threshold
641
13.6.3
Laser threshold for a quantum well laser
647
13.6.4
Scaling rule for multi-quantum well lasers
649
13.7
Dynamic aspects of laser diodes
652
13.8
Characteristics of laser diode emission
655
13.8.1
Spectral distribution
655
13.8.2
Spatial distribution
656
Complement to Chapter
13 660
13.A Distributed feedback (DFB) lasers
660
13.B Strained quantum well lasers
665
13.C Vertical cavity surface emitting lasers (VCSELs)
671
13.C.1 Conditions for achieving threshold in a VCSEL
671
13.C.2 VCSEL performance
675
1
3.D Thermal aspects of laser diodes and high power devices
676
13.
E
Spontaneous emission in semiconductor lasers
683
13.
F
Gain saturation and the
К
factor
690
13.G Laser diode noise and linewidth
696
13.G.1 Linewidth broadening
700
13.G.2 Relative intensity noise
(RIN)
and optical link budget
701
13.
H
Unipolar quantum cascade lasers
704
13.1
Mode competition: cross gain modulators
708
¡udes
713 |
| any_adam_object | 1 |
| author | Rosencher, Emmanuel Vinter, Borge |
| author_facet | Rosencher, Emmanuel Vinter, Borge |
| author_role | aut aut |
| author_sort | Rosencher, Emmanuel |
| author_variant | e r er b v bv |
| building | Verbundindex |
| bvnumber | BV014089846 |
| callnumber-first | T - Technology |
| callnumber-label | TA1750 |
| callnumber-raw | TA1750 |
| callnumber-search | TA1750 |
| callnumber-sort | TA 41750 |
| callnumber-subject | TA - General and Civil Engineering |
| classification_rvk | UH 5500 ZN 5000 |
| ctrlnum | (OCoLC)248358373 (DE-599)BVBBV014089846 |
| dewey-full | 621.381/045 |
| dewey-hundreds | 600 - Technology (Applied sciences) |
| dewey-ones | 621 - Applied physics |
| dewey-raw | 621.381/045 |
| dewey-search | 621.381/045 |
| dewey-sort | 3621.381 245 |
| dewey-tens | 620 - Engineering and allied operations |
| discipline | Physik Elektrotechnik / Elektronik / Nachrichtentechnik |
| edition | 1. publ. in English |
| format | Book |
| fullrecord | <?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>00000nam a2200000 c 4500</leader><controlfield tag="001">BV014089846</controlfield><controlfield tag="003">DE-604</controlfield><controlfield tag="005">20050110</controlfield><controlfield tag="007">t</controlfield><controlfield tag="008">020114s2002 ad|| |||| 00||| eng d</controlfield><datafield tag="020" ind1=" " ind2=" "><subfield code="a">0521778131</subfield><subfield code="9">0-521-77813-1</subfield></datafield><datafield tag="020" ind1=" " ind2=" "><subfield code="a">0521771293</subfield><subfield code="9">0-521-77129-3</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(OCoLC)248358373</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-599)BVBBV014089846</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-604</subfield><subfield code="b">ger</subfield><subfield code="e">rakwb</subfield></datafield><datafield tag="041" ind1="1" ind2=" "><subfield code="a">eng</subfield><subfield code="h">fre</subfield></datafield><datafield tag="049" ind1=" " ind2=" "><subfield code="a">DE-20</subfield><subfield code="a">DE-703</subfield><subfield code="a">DE-1050</subfield><subfield code="a">DE-91</subfield><subfield code="a">DE-355</subfield><subfield code="a">DE-19</subfield><subfield code="a">DE-83</subfield></datafield><datafield tag="050" ind1=" " ind2="0"><subfield code="a">TA1750</subfield></datafield><datafield tag="082" ind1="0" ind2=" "><subfield code="a">621.381/045</subfield><subfield code="2">21</subfield></datafield><datafield tag="084" ind1=" " ind2=" "><subfield code="a">UH 5500</subfield><subfield code="0">(DE-625)145663:</subfield><subfield code="2">rvk</subfield></datafield><datafield tag="084" ind1=" " ind2=" "><subfield code="a">ZN 5000</subfield><subfield code="0">(DE-625)157430:</subfield><subfield code="2">rvk</subfield></datafield><datafield tag="100" ind1="1" ind2=" "><subfield code="a">Rosencher, Emmanuel</subfield><subfield code="e">Verfasser</subfield><subfield code="4">aut</subfield></datafield><datafield tag="240" ind1="1" ind2="0"><subfield code="a">Optoélectronique</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Optoelectronics</subfield><subfield code="c">Emmanuel Rosencher ; Borge Vinter</subfield></datafield><datafield tag="250" ind1=" " ind2=" "><subfield code="a">1. publ. in English</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="a">Cambridge [u.a.]</subfield><subfield code="b">Cambridge Univ. Press</subfield><subfield code="c">2002</subfield></datafield><datafield tag="300" ind1=" " ind2=" "><subfield code="a">XVI, 725 S.</subfield><subfield code="b">Ill., graph. Darst.</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="b">n</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="b">nc</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Dispositifs optoélectroniques</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Optoélectronique</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Optoelectronic devices</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Optoelectronics</subfield></datafield><datafield tag="650" ind1="0" ind2="7"><subfield code="a">Optoelektronik</subfield><subfield code="0">(DE-588)4043687-1</subfield><subfield code="2">gnd</subfield><subfield code="9">rswk-swf</subfield></datafield><datafield tag="689" ind1="0" ind2="0"><subfield code="a">Optoelektronik</subfield><subfield code="0">(DE-588)4043687-1</subfield><subfield code="D">s</subfield></datafield><datafield tag="689" ind1="0" ind2=" "><subfield code="5">DE-604</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Vinter, Borge</subfield><subfield code="e">Verfasser</subfield><subfield code="4">aut</subfield></datafield><datafield tag="856" ind1="4" ind2="2"><subfield code="m">Digitalisierung UB Regensburg</subfield><subfield code="q">application/pdf</subfield><subfield code="u">http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=009651760&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA</subfield><subfield code="3">Inhaltsverzeichnis</subfield></datafield><datafield tag="943" ind1="1" ind2=" "><subfield code="a">oai:aleph.bib-bvb.de:BVB01-009651760</subfield></datafield></record></collection> |
| id | DE-604.BV014089846 |
| illustrated | Illustrated |
| indexdate | 2024-09-06T00:13:26Z |
| institution | BVB |
| isbn | 0521778131 0521771293 |
| language | English French |
| oai_aleph_id | oai:aleph.bib-bvb.de:BVB01-009651760 |
| oclc_num | 248358373 |
| open_access_boolean | |
| owner | DE-20 DE-703 DE-1050 DE-91 DE-BY-TUM DE-355 DE-BY-UBR DE-19 DE-BY-UBM DE-83 |
| owner_facet | DE-20 DE-703 DE-1050 DE-91 DE-BY-TUM DE-355 DE-BY-UBR DE-19 DE-BY-UBM DE-83 |
| physical | XVI, 725 S. Ill., graph. Darst. |
| publishDate | 2002 |
| publishDateSearch | 2002 |
| publishDateSort | 2002 |
| publisher | Cambridge Univ. Press |
| record_format | marc |
| spelling | Rosencher, Emmanuel Verfasser aut Optoélectronique Optoelectronics Emmanuel Rosencher ; Borge Vinter 1. publ. in English Cambridge [u.a.] Cambridge Univ. Press 2002 XVI, 725 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier Dispositifs optoélectroniques Optoelectronic devices Optoelectronics Optoelektronik (DE-588)4043687-1 gnd rswk-swf Optoelektronik (DE-588)4043687-1 s DE-604 Vinter, Borge Verfasser aut Digitalisierung UB Regensburg application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=009651760&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Rosencher, Emmanuel Vinter, Borge Optoelectronics Dispositifs optoélectroniques Optoélectronique Optoelectronic devices Optoelectronics Optoelektronik (DE-588)4043687-1 gnd |
| subject_GND | (DE-588)4043687-1 |
| title | Optoelectronics |
| title_alt | Optoélectronique |
| title_auth | Optoelectronics |
| title_exact_search | Optoelectronics |
| title_full | Optoelectronics Emmanuel Rosencher ; Borge Vinter |
| title_fullStr | Optoelectronics Emmanuel Rosencher ; Borge Vinter |
| title_full_unstemmed | Optoelectronics Emmanuel Rosencher ; Borge Vinter |
| title_short | Optoelectronics |
| title_sort | optoelectronics |
| topic | Dispositifs optoélectroniques Optoélectronique Optoelectronic devices Optoelectronics Optoelektronik (DE-588)4043687-1 gnd |
| topic_facet | Dispositifs optoélectroniques Optoélectronique Optoelectronic devices Optoelectronics Optoelektronik |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=009651760&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
| work_keys_str_mv | AT rosencheremmanuel optoelectronique AT vinterborge optoelectronique AT rosencheremmanuel optoelectronics AT vinterborge optoelectronics |