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56 SHG efficiency (a. u.) 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 SHG in the KTP waveguide with Λ = 104.17 µm 0 1440 1460 1480 1500 1520 1540 1560 1580 λp [nm] Figure 4.34: Measured conversion efficiencies for different pump wavelengths
kSHG(762.5nm) 14.5506/ µm kp1(1525nm) 7.15375 / µm kp2(1525nm) 7.48836 / µm kΛ=104.17µm 0.0603166 / µm -0.01335 / µm kerr Table 4.3: Calculated k-vectors at the degeneracy point indicates the phasematching peak we measured. Plot 4.35 shows that we should be able to detect two additional phasematching points at 1629.18 nm where the m=-1 contour again crosses the +45 ◦ slope and at 1089.72 nm. Here the m=+1 contour cuts the black line. Both points are indicated with green circles in the corresponding Figures. Figure 4.35: Corrected phasematching Figure 4.36: Corrected phasematching 2D Further investigation As a first step we simplified the setup. It is no longer necessary to monitor the SHG spectra. We built up the setup drafted in Figure 4.37. The polarization filter, as always, served to filter any type-I SHG processes. With two different powermeters, we monitored the SHG power and the OPA power propagating through the waveguide. Two frequency filters where applied to discard either the pump or the SHG, in order to get a clean signal in the respective powermeter. The first spectrometer before the waveguide was kept to monitor the OPA. Our results can be seen in Figures 4.38 and 4.39 (all measurement data is presented in Appendix A.4.3). Three phasematching points could be identified at 1138 nm, 1554 nm and 1627 nm, in the first measurement (Figure 4.39) and in the sec- 57
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Towards a pure heralded single phot
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ii A.2 id201 programming . . . . .
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Chapter 1. Overview 2
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experimental data. This thesis is d
Page 10 and 11: a nonlinear, nonmagnetic material,
Page 12 and 13: Figure 3.3: Parametric down convers
Page 14 and 15: For the volume integration, we rest
Page 16 and 17: Figure 3.5: 1D square-wave periodic
Page 18 and 19: and 3.10). Figure 3.9: 0-0 waveguid
Page 20 and 21: By inserting the corresponding term
Page 22 and 23: Λi phasematching Λs Figure 3.18:
Page 24 and 25: pump mode → signal mode + idler m
Page 26 and 27: Hence, we have to ensure a separabl
Page 28 and 29: 3.2.2 Frequency entanglement of two
Page 30 and 31: 3.3 Generating pure heralded single
Page 32 and 33: Material: KTP Polarizations: y →
Page 34 and 35: Material: KTP Polarizations: y →
Page 36 and 37: 32 Ωi�PHz� 1.26 1.23 1.2 Φ
Page 38 and 39: The first appealing feature of coun
Page 40 and 41: Ωi�PHz� 0.10 0.05 1.22 1.215
Page 42 and 43: 38 Figure 3.53: Different pump freq
Page 45 and 46: 4 Experiment 4.1 Avalanche photodio
Page 47 and 48: kcounts / second 0.14 0.12 0.1 0.08
Page 49 and 50: kcounts per second 180 160 140 120
Page 51 and 52: or z-polarization, and we are left
Page 53 and 54: Gaussian functions. The result is a
Page 55 and 56: that the phasematching point was sh
Page 57 and 58: this two dimension plane on the bla
Page 59: plotted in Appendix A.4.3. Shg powe
Page 63 and 64: kSHG(762.5nm) 14.2703/ µm kp1(1525
Page 65 and 66: Outlook measurement signal counts/s
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kcounts / second kcounts / second k
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kcounts / second 80 70 60 50 40 30
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kcounts per second kcounts per seco
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E y E y -> E y E y E y -> E z E y E
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BCT0703-B12 second measurement The
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Shg power Pump power [a.u.] Shg pow
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Shg power Pump power [a.u.] 90 80 7
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ITI0706-B124 power measurement The
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Bibliography [1] H. J. Kimble, M. D
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[25] Carlot Canalias and Valdas Pas
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Thanks ❏ To Dr. Christine Silberh
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Erklärung Gemäß §31(2) der Dipl
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Diploma thesis

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