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1 About Omics Group OMICS Group International through its Open Access Initiative is committed to make genuine and reliable contributions to the scientific community. OMICS Group hosts over 400 leading-edge peer reviewed Open Access Journals and organize over 300 International Conferences annually all over the world. OMICS Publishing Group journals have over 3 million readers and the fame and success of the same can be attributed to the strong editorial board which contains over eminent personalities that ensure a rapid, quality and quick review process.
2 About Omics Group conferences OMICS Group signed an agreement with more than 1000 International Societies to make healthcare information Open Access. OMICS Group Conferences make the perfect platform for global networking as it brings together renowned speakers and scientists across the globe to a most exciting and memorable scientific event filled with much enlightening interactive sessions, world class exhibitions and poster presentations Omics group has organised 500 conferences, workshops and national symposium across the major cities including SanFrancisco,Omaha,Orlado,Rayleigh,SantaClara,Chicag o,philadelphia,unitedkingdom,baltimore,sanantanio,dub ai,hyderabad,bangaluru and Mumbai.
3 Development of a high power coherent quantum cascade laser array mounted in extended-cavity system R. Vallon 1, B.Parvitte 1,G.M. de Naurois 2, G. Maison 2, M. Carras 2, V. Zéninari 1 1 Groupe de Spectrométrie Moléculaire et Atmosphérique, UMR 7331 CNRS, Université de Reims 2 III-V lab, GIE Alcatel Thales CEA LETI September 08-10, 2014 Optics
4 Outline Motivations Technical challenges Array QCL emitters performances Preliminary results in extended cavity Conclusion & perspectives September 08-10, 2014 Optics
5 Introduction High power technology Single-mode Tunable Wide-spectral range Room temperature High power extended-cavity QCL for spectroscopic applications photo-acoustic, saturated molecular absorption EC-QCL September 08-10, 2014 Optics
6 Context Power vs current No warming Powe er (W) Rth =3,5 K/W Rth =4 K/W Rth = 5 K/W Slope Threshold current Rth = 8 K/W Current (A) QCL Optical performances limited by thermal resistance September 08-10, 2014 Optics
7 Context Increase heat extraction Double trench process Buried process Active region R th = 10 K/W R th = 4 K/W September 08-10, 2014 Optics
8 Context No warming Rth =3,5 K/W Power (W) Rth =4 K/W Rth = 5 K/W Rth = 8 K/W Current (A) Optical performances : not limited by thermal resistance but by injection current September 08-10, 2014 Optics
9 Context Increase current Beam quality performances limited by active region size warming 10µm 15µm 20µm 25µm 30µm Power (W) 35µm September 08-10, 2014 Optics
10 One solution : buried + micro-structured QCL µ-structure increase thermal surface exchange InP:Fe Active region InP:Si Thermal dissipation enhancement September 08-10, 2014 Optics
11 One solution : buried + micro-structured QCL µ-structure pitch: Λ=w+D w D Active region w ~ 2µm 2 µm<d 8.2µm Λ < 3*λ/2 for dual-lobe operation (anti-symetric supermode) Evanescent coupling September 08-10, 2014 Optics
12 µ-stipes QCL Near field Below threshold Above threshold Spontaneous emission Stimulated emission G.M. de Naurois et al, Optics Letters, Vol. 37, No.3 (2012) September 08-10, 2014 Optics
13 µ-stripes QCL Far field : dual lobes emission Simulation 2µm width, 6µm pitch Measurement September 08-10, 2014 Optics
14 µ-stripes QCL Far field Simulation 2µm width, 6µm pitch Measurement 4 emitters in extended cavity September 08-10, 2014 Optics
15 µ-stripes EC-QCL Experimental setup HR coated uncoated (R=30%) 90 FTIR interferometer September 08-10, 2014 Optics
16 µ-stripes EC-QCL Experimental setup Output beam September 08-10, 2014 Optics
17 µ-stripes EC-QCL P(I) Pulse operation 100ns-100kHz September 08-10, 2014 Optics
18 µ-stripes EC-QCL Threshold Threshold : 730mA 700mA September 08-10, 2014 Optics
19 µ-stripes EC-QCL P(I) September 08-10, 2014 Optics
20 µ-stripes EC-QCL P(I) September 08-10, 2014 Optics
21 µ-stripes EC-QCL P(I) September 08-10, 2014 Optics
22 µ-stripes EC-QCL Spectral range Mono-mode operation : 19.5 cm -1 multimode : 30 cm -1 : 1.45 cm -1 September 08-10, 2014 Optics
23 µ-stripes EC-QCL Gas analysis : setup September 08-10, 2014 Optics
24 µ-stripes EC-QCL Gas analysis : Acetone 10 Torr, 20 cm September 08-10, 2014 Optics
25 Conclusion / Perspectives Preliminary results of EC-µstripe QCL array Perspectives : Increase optical feedback to increase tunable spectral range 32 emitter array EC-QCL CW operation Application : photoacoustic spectrometer Acknowledgement : French Research Agency September 08-10, 2014 Optics
26 Electric Field & µ-stripe September 08-10, 2014 Optics
27 September 08-10, 2014 Optics
28 Let Us Meet Again We welcome all to our future group conferences of Omics group international Please visit:
About Omics Group conferences
About Omics Group OMICS Group International through its Open Access Initiative is committed to make genuine and reliable contributions to the scientific community. OMICS Group hosts over 400 leading-edge
About Omics Group conferences
About Omics Group OMICS Group International through its Open Access Initiative is committed to make genuine and reliable contributions to the scientific community. OMICS Group hosts over 400 leading-edge
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