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About Omics Group

About Omics Group.

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About Omics Group

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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 30000 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,Chicago,Philadelphia,Unitedkingdom,Baltimore,SanAntanio,Dubai,Hyderabad,Bangaluru and Mumbai.

  3. New Wavelength Generation in T-Cavity Vertical-External-Cavity Surface-Emitting Lasers Chris Hessenius and Mahmoud Fallahi College of Optical Sciences, University of Arizona CHessenius@optics.arizona.edu Mahmoud@optics.arizona.edu Acknowledgement: NSF NSF-ECCS and IIP-PFI Air

  4. Outline - Introduction to High Power VECSELs - Single Chip Characteristics - T-Cavity Configuration - Sum Frequency Generation - Difference Frequency Generation - Concluding Remarks

  5. Design of High Power VECSEL • Approach • Large number of QWs with Resonant Periodic Gain • Active region close to effective heat sink • Thermal management by substrate removal, heat spreader approach • InGaAs/GaAs /GaAsP strained compensated MQW • Resonant periodic gain (RPG) MQW • DBR on Chip • Barrier Optical Pumping

  6. Linear Cavity Configuration - High power and high beam quality (TEM00) - Wavelength tolerant barrier pumping - Power scaling by increased beam diameter - Access to intracavity radiation OC Pump Laser VECSEL Chip CVD

  7. VECSEL History and Progress

  8. Fundamental Performance M2 < 1.4 M2 < 1.3 980nm VECSEL 1180nm VECSEL

  9. T-Cavity Configuration • T-cavity Two-chip VECSEL: • TEM00, narrow linewidth for each wavelength • Ease of wavelength tuning • High intracavity intensity • Chip 1: P-Polarized Cavity • Pump Spot Diameter ~ 500um • 1mm thick BF included in Cavity • Chip 2: S-Polarized Cavity • Pump Spot Diameter ~ 500um • 2mm thick BF included in Cavity

  10. Combined Output • Output measured for each cavity individually. • Then the output was measured for the combined operation.

  11. Independent Tuning of Each Wavelength

  12. Output Profiles of Collinear Operation A) B) C) • Measured outputs beam profiles • P-polarized beam profile. • S-polarized beam profile. • c) Combined S and P output beam profile.

  13. T-Cavity Configuration Summary Total Output is Sum of Both Cavities Individual Tuning of Each Wavelength Cavity Design Excellent Beam Overlap is Demonstrated P-Pol S-Pol Combined

  14. SFG and DFG

  15. Type II SFG in T-Cavity • Combine two VECSEL chips with similar 980nm outputs • Tunable type II blue

  16. Type II Green Output Can mix 1180nm and 980nm VECSEL chips to generate green outputs

  17. Multiple Color Generation Only blue output Only yellow output Combined blue and green outputs = cyan laser Only green output

  18. ETHz Λ THz by Type II DFG α x Λx Esignal Epump 45o PPLN with tilted poling period for perpendicular THz extraction Fundamental separation ~3nm for ~1 THz output

  19. Mid-IR by Type II DFG Fundamentals at ~968nm and ~1179nm produced output at ~5400nm Same configuration for green SFG yields mid-IR via DFG

  20. Concluding Remarks • Can be a viable and affordable alternative for widely tunable Visible and IR high- power sources • VECSELs offer a flexible platform for a wide range of fundamental lasing wavelengths • Intracavity access can allow for new operating features • Two-chip T-cavity can provide efficient SFG and DFG pulsed operation

  21. Let Us Meet Again We welcome all to our future group conferences of Omics group international Please visit: www.omicsgroup.com www.Conferenceseries.com http://optics.conferenceseries.com/

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