Mode-resolved Fabry-Perot experiment in low-loss Bragg-reflection waveguides

Pressl, Benedikt; Günthner, T.; Laiho, Kaisa; Geßler, J.; Kamp, M.; Höfling, Sven; Schneider, Christian; Weihs, Gregor

doi:10.1364/oe.23.033608

Cited by 15 publications

(28 citation statements)

References 40 publications

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“…A 100× microscope objective couples the light to the BRW under study and an aspheric lens with a focal length of 3.1 mm collects the light afterwards. After that the NIR light is directed to a spectrograph with 10 pm resolution and recorded with a detector array (DA) sensitive in the range from 400 nm to 1000 nm for observing the Fabry-Perot fringes as in reference [21].…”

Section: Methodsmentioning

confidence: 99%

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Uncovering dispersion properties in semiconductor waveguides to study photon-pair generation

et al. 2016

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We investigate the dispersion properties of ridge Bragg-reflection waveguides to deduce their phasematching characteristics. These are crucial for exploiting them as sources of parametric down-conversion (PDC). In order to estimate the phasematching bandwidth we first determine the group refractive indices of the interacting modes via Fabry-Perot experiments in two distant wavelength regions. Second, by measuring the spectra of the emitted PDC photons, we gain access to their group index dispersion. Our results offer a simple approach for determining the PDC process parameters in the spectral domain, and provide important feedback for designing such sources, especially in the broadband case.

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Section: Methodsmentioning

confidence: 99%

“…Recently, we used Fabry-Perot measurements in BRWs to accurately measure the group index of the pump [21]. Here, we apply this method also in the down-conversion wavelengths to obtain the phasematching bandwidth of our BRWs.…”

Section: Introductionmentioning

confidence: 99%

Uncovering dispersion properties in semiconductor waveguides to study photon-pair generation

et al. 2016

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“…The modal propagation loss was measured to be 14.3/cm using the cut back method [14]. This loss value is larger than typical values measured for similar devices [15,16]. This is in part due to the extensive reach of the optical field of the Bragg mode within the cladding, which yields to larger overlap with the doped layers.…”

Section: Laser Design and Performancementioning

confidence: 77%

Tuning parametric processes in semiconductor diode lasers

2018

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We present GaAs/AlGaAs semiconductor lasers in which second-order nonlinearities are phase matched for efficient second-order nonlinear conversion. A comprehensive study of difference frequency generation (DFG) is presented, and the process is characterized for tuning, efficiency, and tolerances. External nonlinear conversion efficiency of 1.84 × 10 −2 %∕W∕cm 2 is measured for the DFG process. The effects of carrier injection and temperature variation on DFG wavelength are studied, and the two effects are deconvolved for better understanding of carrier effects on nonlinear conversion. A wide DFG tuning range for the device operation is experimentally demonstrated where the idler wavelength can be tuned more than 30 nm for every 1-nm span of the pump wavelength.

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“…Prior to that, the signal beam is delayed by a time τ with respect to the idler. Thus, we apply the beam splitter transformationŝ (b) The absolute value of the JSA for our BRW in terms of the wavelength λ subjected to the spectral filtering of our experiment and calculated using the PDC process parameters measured in Refs [24,32]. The output paths taken by the H-polarized signal and V -polarized idler are shown in the different spectral regions.…”

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confidence: 99%

“…The pump pulses are coupled into our BRW with a 100x microscope objective and collimated afterwards with a high numerical aperture aspheric lens having a 3 mm focal length. The investigated BRW with the same layer structure as in Refs [21,24,32] has 4 µm ridge width, is 1.87 mm long and its front facet is anti-reflection coated for the pump wavelengths. Signal and idler are emitted into the fundamental total internal reflection modes, whereas the pump is a higher-order spatial mode called Bragg mode.…”

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confidence: 99%

Temporally versatile polarization entanglement from Bragg reflection waveguides

et al. 2017

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Bragg-reflection waveguides emitting broadband parametric down-conversion (PDC) have been proven to be well suited for the on-chip generation of polarization entanglement in a straightforward fashion [R. T. Horn et al., Sci. Rep. 3, 2314]. Here, we investigate how the properties of the created states can be modified by controlling the relative temporal delay between the pair of photons created via PDC. Our results offer an easily accessible approach for changing the coherence of the polarization entanglement, in other words, to tune the phase of the off-diagonal elements of the density matrix. Furthermore, we provide valuable insight in the engineering of these states directly at the source.The verification of the non-classical nature of quantum objects, such as photons, plays an important role to ensure a successful implementation of forthcoming quantum technologies. Among theses tasks is the preparation and characterization of polarization entanglement that provides some of the strongest evidence of the quantum features of light [1][2][3]. Since the first realizations with parametric down-conversion (PDC) in bulk crystals more than two decades ago [4][5][6], a lot of effort has been put in replacing them both with ferroelectric [7][8][9][10][11] and semiconductor waveguides [12][13][14], which provide higher brightnesses and easier alignment in collinear configurations.In one of such configurations, the cross-polarized PDC photon pairs-called signal and idler-that have at least some nanometers of spectral extent, are divided on a dichroic beam splitter into two paths [15][16][17][18][19]. Due to a strict frequency or energy correlation between signal and idler, a two-partite polarization superposition is created between the output paths of the dichroic mirror. Often, a continuous-wave pump laser is utilized to guarantee tight correlations in the spectral domain [14,20].Bragg-reflection waveguides (BRWs) made of AlGaAs generate indistinguishable photon pairs over several tens of nanometers [14,21] and they have been utilized for narrowband multiplexing of polarization entanglement [22,23]. Due to the very small birefringence between the orthogonally-polarized signal and idler [24], BRWs may work reasonably well in this configuration even without compensating their temporal walk-off. However, their group index difference is large enough to result into an uncompensated phase. Therefore, the engineering of the spectro-temporal degree of freedom of PDC photon pairs from BRWs is essential for the controlled creation and manipulation of the polarization entanglement.Changes in the coherence of the polarization entangled states, that is their phase, provide an interesting degree of freedom for the state manipulation [2]. When regarding PDC sources, this is usually accomplished by * kaisa.laiho@uibk.ac.at modifying the characteristics of one of the entangled parties with birefringent retarders [14,25,26]. However, the phase control over the joint state can possibly be realized more easily [27][28][29]. Here, we generat...

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Mode-resolved Fabry-Perot experiment in low-loss Bragg-reflection waveguides

Cited by 15 publications

References 40 publications

Uncovering dispersion properties in semiconductor waveguides to study photon-pair generation

Uncovering dispersion properties in semiconductor waveguides to study photon-pair generation

Tuning parametric processes in semiconductor diode lasers

Temporally versatile polarization entanglement from Bragg reflection waveguides

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