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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,Chicago,P hiladelphia,unitedkingdom,baltimore,sanantanio,dubai,h yderabad,bangaluru and Mumbai.

3 High frequency modulation for injection locking of mid-infrared QCL Maria Amanti A.Calvar, M. Renaudat Saint-Jean, S. Barbieri, C. Sirtori, A. Bismuto, J. Faist, G. Beaudoin, I. Sagnes In collaboration with:

4 1) QCLs are unipolar devices based on intersubband transitions Laser diode Transition energy depends only on layer thickness Ultrafast carrier lifetime (ps) Photon energy is fixed by chemistry Carrier lifetimeof 100 ps

5 Photon population Current modulation a τ up = τ 3

6 Photon population Current modulation a τ up = τ 3

7 Diode lasers τ 3 1 ns vs α tot = 10 cm -1 τ photon 10 ps j/j th =1.3 QCL τ ps

8 Motivations Stabilization and control of the laser modes via direct modulation Frequency Combs for spectroscopy Molecular absorption in the MIR Mode locking for mid infrared non linear optics Nature Photonics 6, ,(2012). Time

9 Stabilization of the laser cavity modes: toward frequency combs Bias Laser Optical spectrum Microwave spectrum Optical Intensity ω Β ω n-1 ω n ω n+1 Frequency ω B FWHM give an insight on the noise of the cavity modes

10 Stabilization of the laser cavity modes: toward frequency combs Bias Laser Optical spectrum Optical Intensity Modulation at ω inj : ω Β ω ω inj inj ω n-1 ω n ω n+1 Frequency

11 Stabilization of the laser cavity modes: toward frequency combs Bias Laser Optical spectrum Microwave spectrum Optical Intensity Modulation at ω inj =ω B ω Β ω inj ω inj ω n-1 ω n ω n+1 Frequency ω B

12 Stabilization of the laser cavity modes: toward frequency combs Bias Laser Optical spectrum Microwave spectrum Optical Intensity Modulation at ω inj close to ω B ω Β ω inj ω inj ω n-1 ω n ω n+1 ω inj ω B

13 Direct modulation of a 9µm Buried 9 µm in InGaAs/AlInAs Experimental set-up Modulation QCL Spectrum analyzer 65 GHz band QWIP detector

14 Direct modulation of a 9µm Experimental set-up Modulation QCL Spectrum analyzer 65 GHz band QWIP detector Modulation Beat note of the cavity modes FWHM= 1.2MHz

15 Direct modulation of a 9µm Experimental set-up Modulation QCL Spectrum analyzer 65 GHz band QWIP detector

16 Direct modulation of a 9µm Experimentalset-up Modulation QCL Spectrum analyzer 65 GHz band QWIP detector

17 Direct modulation of a 9µm Experimentalset-up Modulation QCL Spectrum analyzer 65 GHz band QWIP detector Locking of the optical modes to the external RF source

18 Direct modulation of a 9µm Experimentalset-up Modulation QCL Spectrum analyzer 65 GHz band QWIP detector Tuning of the cavity modes with the external modulation

19 Direct modulation of a 9µm Experimentalset-up Modulation QCL Spectrum analyzer 65 GHz band QWIP detector Tuning of the cavity modes with the external modulation

20 Direct modulation of a 9µm Experimentalset-up Modulation QCL Spectrum analyzer 65 GHz band QWIP detector

21 Direct modulation of a 9µm Experimentalset-up Modulation QCL Spectrum analyzer 65 GHz band QWIP detector

22 Direct modulation of a 9µm Experimentalset-up Modulation QCL Spectrum analyzer 65 GHz band QWIP detector

23 Direct modulation of a 9µm Experimentalset-up Modulation QCL Spectrum analyzer 65 GHz band QWIP detector

24 Direct modulation of a 9µm Experimentalset-up Modulation QCL Spectrum analyzer 65 GHz band QWIP detector

25 Direct modulation of a 9µm Experimentalset-up Modulation QCL Spectrum analyzer 65 GHz band QWIP detector ω m 1MHz Modulation Beat note of the cavity modes Injected power : 20 dbm

26 Evolution of the locking with the emitted optical power Buried 9 µm in InGaAs/AlInAs Voltage (V) Optical Power (mw) ka/cm -2

27 Evolution of the locking with the emitted optical power Buried 9 µm in InGaAs/AlInAs Voltage (V) Optical Power (mw) ka/cm 1.7 ka/cm 2

28 Evolution of the locking with the emitted optical power Buried 9 µm in InGaAs/AlInAs Voltage (V) Optical Power 1.7 ka/cm 2.0 ka/cm ka/cm 2

29 Evolution of the locking with the emitted optical power Buried 9 µm in InGaAs/AlInAs Voltage (V) Optical Power (mw) ka/cm 1.7 ka/cm 2.0 ka/cm 2.4 ka/cm 2 No locking

30 Coupled oscillators Theory Laser oscillations Cavity field Microwave modulation Modulated signal ω Β ω inj ω n-1 ω n ω n+1

31 Coupled oscillators Theory Laser oscillations Cavity field Microwave modulation Modulated signal ω Β ω inj ω n-1 ω n ω n+1 Microwave losses (propagation losses, impedence mismatch)

32 Coupled oscillators Theory Laser oscillations Cavity field Microwave modulation Modulated signal ω Β ω inj ω n-1 ω n ω n+1 Locking range Siegman, A. (1986). Lasers. University Science Book Razavi, B. (2004). Solid-State Circuits, IEEE, 39(9):

33 Coupled oscillators Theory Laser oscillations Cavity field Microwave modulation Modulated signal ω Β ω inj ω n-1 ω n ω n+1 Modulation power Locking range Optical power Siegman, A. (1986). Lasers. University Science Book Razavi, B. (2004). Solid-State Circuits, IEEE, 39(9):

34 Coupled oscillators theory ω m ω m ω m 0.35 slope 5e-6 MHz -1 (I inj )/ω m ( W)/MHz I 0 ( W)

35 MIR QCL guide

36 MIR QCL guide Microwave line

37 MIR QCL guide Microwave line Design: Control of the losses in the MIR Thickness of the InP claddings Good overlap of the microwave with the active region Width of the top contact

38 Simulations of the optical and microwave modes Drude model for the calculation of the complex refractive index Finite element 2D simulation in the plane of the facet Microstrip Standard 33 THz (cm -1 ) GHz (cm -1 ) Overlap AR@ 13 GHz (%) Figure of 13 GHz (cm)

39 Microstrip vs Standard Buried heterostructure Modulation response 15 GHz Improvement of the bandpass up to ~ 15 GHz Calvar et al Applied Physics Letters 102, (2013)

40 Microstrip vs Standard Buried heterostructure Similar performances Calvar et al Applied Physics Letters 102, (2013)

41 Microstrip vs Standard Buried heterostructure Similar performances dbm dbm FWHM 1,2 MHz FWHM 100 khz Calvar et al Applied Physics Letters 102, (2013)

42 Direct modulation of a microstrip 9µm Modulation QCL 65 GHz band QWIP detector

43 Direct modulation of a microstrip 9µm Renaudat Saint-Jean et al Laser & Photonics Reviews 8,

44 Direct modulation of a microstrip 9µm Beatnote(Δω) Signal atthe modulation frequency ω m Locking over more than 1.5 MHz Renaudat Saint-Jean et al Laser & Photonics Reviews 8,

45 Direct modulation of a microstrip 9µm Broadening of 40 % (13 cm -1 ) of the spectrum width 7 Renaudat Saint-Jean et al Laser & Photonics Reviews 8,

46 Microstrip vs Standard Buried heterostructure Microstrip laser Standard laser 20 dbm No effecton the beatnote

47 Coupled oscillators theory (I inj )/ω m ( W)/MHz slope 5e-6 MHz -1 slope 5e-7 MHz I 0 ( W)

48 Coupled oscillators theory (I inj )/ω m ( W)/MHz slope 5e-6 MHz -1 slope 5e-7 MHz I 0 ( W) Microwave lossesfor the microstripreduced of a factor 10respect to standard buried

49 Conclusion: Injection locking of QCL emitting in the mid infrared via direct modulation Design and realization of waveguide embedded in a microstrip line: Reduction of a factor 10 of the microwave losses Locking over more than 1.5 MHz with 10 dbmmodulation Power THANK YOU FOR YOUR ATTENTION

50

51 Injected signal

52 Let Us Meet Again We welcome all to our future group conferences of Omics group international Please visit:

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