Optical Frequency Down-Conversion With Bandwidth Compression Based on Counter-Propagating Phase Matching

Optical quantum network plays an important role in large scale quantum communication. However, different components for photon generation, transmission, storage and manipulation in network usually cannot interact directly due to the wavelength and bandwidth differences, and thus interfaces are needed to overcome such problems. We propose an optical interface for frequency down-conversion and bandwidth compression based on the counter-propagating quasi-phase-matching difference frequency generation process in the periodically-poled lithium niobate on insulator waveguide. We prove that a separable spectral transfer function can be obtained only by choosing proper pump bandwidth, thus relaxing the limitation of material, dispersion, and working wavelength as a result of the counter-propagation phase-matching configuration. With numerical simulations, we show that our design results in a nearly separable transfer function with the Schmidt number very close to 1. With proper pump bandwidth, an photon at central wavelength of 550 nm with a bandwidth ranging from 50 GHz to 5 THz can be converted to a photon at central wavelength of 1,545 nm with a much narrower bandwidth of 33 GHz.

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Observation of frequency-uncorrelated photon pairs generated by counter-propagating spontaneous parametric down-conversion

Scientific Reports ◽

10.1038/s41598-021-92141-y ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Yi-Chen Liu ◽

Dong-Jie Guo ◽

Kun-Qian Ren ◽

Ran Yang ◽

Minghao Shang ◽

...

Keyword(s):

Single Photon ◽

Difference Frequency Generation ◽

Matching Condition ◽

Experimental Result ◽

Pump Light ◽

Generation Process ◽

Schmidt Decomposition ◽

Photon Pairs ◽

Parametric Down Conversion ◽

Down Conversion

AbstractWe report the generation of frequency-uncorrelated photon pairs from counter-propagating spontaneous parametric down-conversion in a periodically-poled KTP waveguide. The joint spectral intensity of photon pairs is characterized by measuring the corresponding stimulated process, namely, the difference frequency generation process. The experimental result shows a clear uncorrelated joint spectrum, where the backward-propagating photon has a narrow bandwidth of 7.46 GHz and the forward-propagating one has a bandwidth of 0.23 THz like the pump light. The heralded single-photon purity estimated through Schmidt decomposition is as high as 0.996, showing a perspective for ultra-purity and narrow-band single-photon generation. Such unique feature results from the backward-wave quasi-phase-matching condition and does not has a strict limitation on the material and working wavelength, thus fascinating its application in photonic quantum technologies.

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Study of quasi-phase matching wavelength acceptance bandwidth for periodically poled LiNbO3 crystal-based difference-frequency generation

Optics and Lasers in Engineering ◽

10.1016/j.optlaseng.2008.09.008 ◽

2009 ◽

Vol 47 (5) ◽

pp. 589-593 ◽

Cited By ~ 11

Author(s):

Zhensong Cao ◽

Xiaoming Gao ◽

Weidong Chen ◽

Huan Wang ◽

Weijun Zhang ◽

...

Keyword(s):

Difference Frequency Generation ◽

Difference Frequency ◽

Phase Matching ◽

Linbo3 Crystal ◽

Periodically Poled ◽

Quasi Phase Matching ◽

Frequency Generation

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New Sellmeier and Thermo-Optic Dispersion Formulas for AgGaS2

Crystals ◽

10.3390/cryst9030129 ◽

2019 ◽

Vol 9 (3) ◽

pp. 129

Author(s):

Kiyoshi Kato ◽

Takayuki Okamoto ◽

Sergey Grechin ◽

Nobuhiro Umemura

Keyword(s):

Second Harmonic ◽

Diode Lasers ◽

Difference Frequency Generation ◽

Phase Matching ◽

Temperature Dependent ◽

Periodically Poled ◽

Sum Frequency ◽

Optical Parametric ◽

Good Reproduction ◽

Frequency Generation

This paper reports on the new Sellmeier and thermo-optic dispersion formulas that provide a good reproduction of the temperature-dependent phase-matching conditions for second-harmonic generation (SHG) and sum-frequency generation (SFG) of a CO2 laser and a Nd:YAG laser-pumped KTiOPO4 (KTP) optical parametric oscillator (OPO) in the 0.8859–10.5910 μm range as well as those for difference-frequency generation (DFG) between the two diode lasers in the 4.9–6.5 μm range and DFG between the two periodically poled LiNbO3 (PPLN) OPOs in the 5–12 μm range thus far reported in the literature.

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Efficient idler broadening via oppositely dual-chirped difference frequency generation

High Power Laser Science and Engineering ◽

10.1017/hpl.2020.24 ◽

2020 ◽

Vol 8 ◽

Author(s):

Haizhe Zhong ◽

Bin Hu ◽

Saisai Hu ◽

Shengying Dai ◽

Ying Li ◽

...

Keyword(s):

Frequency Conversion ◽

Laser System ◽

Difference Frequency Generation ◽

Matching Condition ◽

Difference Frequency ◽

Phase Matching ◽

Periodically Poled ◽

Frequency Generation ◽

Phase Matching Condition ◽

Gain Characteristic

Dual-chirped difference frequency generation (DFG) is an advantageous technique for generating the broadband mid-infrared (IR) idler wave, which is inaccessible by a population-inversion-based laser system. In principle, the generated idler wave may even suffer a spectrum broadening compared with the driving pulsed lasers if the pump and signal waves are oppositely chirped. However, broadband phase-matching is always the determining factor for the resulting efficiency and the bandwidth of the generated idler wave. In this study, specific to an oppositely dual-chirped DFG scheme, we derive the precondition to realize broadband frequency conversion, wherein a negative $(1/\unicode[STIX]{x1D710}_{p}-1/\unicode[STIX]{x1D710}_{i})/(1/\unicode[STIX]{x1D710}_{s}-1/\unicode[STIX]{x1D710}_{i})$ , in terms of the correlation coefficient of the group velocity ( $\unicode[STIX]{x1D70E}$ ), is necessary. However, most birefringence bulk crystals can only provide the required material dispersions in limited spectral regions. We show that the periodically poled lithium niobate crystal that satisfies an inactive Type-II (eo-o) quasi-phase-matching condition has a stable negative $\unicode[STIX]{x1D70E}$ and exerts the expected broadband gain characteristic across an ultra-broad idler spectral region $(1.7{-}4.0~\unicode[STIX]{x03BC}\text{m})$ . Finally, we propose and numerically verify a promising DFG configuration to construct a tunable mid-IR spectrum broader based on the broadband phase-matched oppositely dual-chirped DFG scheme.

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COHERENT AND TUNABLE TERAHERTZ OSCILLATORS, GENERATORS, AND AMPLIFIERS

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863502000857 ◽

2002 ◽

Vol 11 (01) ◽

pp. 75-97 ◽

Cited By ~ 15

Author(s):

YUJIE J. DING ◽

IOULIA B. ZOTOVA

Keyword(s):

Effective Interaction ◽

Difference Frequency Generation ◽

Second Order ◽

Nonlinear Susceptibility ◽

Phase Matching ◽

Parametric Oscillation ◽

Terahertz Waves ◽

Optical Parametric Oscillation ◽

Periodically Poled ◽

Parametric Processes

We have considered feasibilities of using optical parametric oscillation and amplification, and difference-frequency generation for efficiently generating and amplifying terahertz waves in several second-order nonlinear optical materials. They include GaAs, GaP, GaSe, CdSe, LiNbO3 and LiTaO3. The advantage of using birefringence in CdSe and GaSe is tunability of the output terahertz frequency. Furthermore, both CdSe and GaSe can be used to achieve the backward parametric oscillation without any cavity. On the other hand, in periodically-poled LiNbO3 and LiTaO3, one can take advantage of large diagonal elements of second-order nonlinear susceptibility tensor. In the diffusion-bonded-stacked GaAs and GaP plates, quasi-phase matching can be achieved by alternatively rotating the plates. It is also feasible to achieve phase matching in a single GaAs or GaP plate due to the presence of the absorption tail of polariton modes. In this case, tuning can be achieved by changing the pump wavelength. The advantages of using coherent parametric processes are possibilities of efficiently generating and amplifying temporally-coherent and narrow-linewidth tunable terahertz waves at room temperature. However, all other schemes do not possess these advantages. Compared with a noncollinear configuration, by using the parallel wave propagation configurations, the conversion efficiency can be higher because of longer effective interaction length among all the waves.

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BIPHOTON WAVE PACKETS GENERATED IN APERIODICALLY POLED CRYSTALS

International Journal of Quantum Information ◽

10.1142/s0219749909004736 ◽

2009 ◽

Vol 07 (supp01) ◽

pp. 63-69 ◽

Cited By ~ 2

Author(s):

G. KH. KITAEVA ◽

S. P. KOVALEV ◽

K. A. KUZNETSOV

Keyword(s):

Correlation Function ◽

Transfer Function ◽

Temporal Correlation ◽

Phase Shifts ◽

Second Order ◽

Periodically Poled ◽

Parametric Down Conversion ◽

Function Module ◽

Down Conversion ◽

Order Susceptibility

The influence of disordering of quasi-phase-matched structures on the properties of biphoton fields generated by spontaneous parametric down-conversion in periodically poled crystals is studied in the general form, taking into consideration arbitrary one-dimensional spatial distribution of the crystal second-order susceptibility. It is shown that the spectral amplitudes of the biphoton wave function become complex and gain frequency- and angle-dependent phase shifts in the structures with unequal lengths of domains. Effects of the spectrum broadening and the phase shifting are expressed in terms of the crystal non-linear transfer function. Spectrum of the first-order correlation function is found to be strictly dependent on the transfer function module, but insensitive to the phase shifts. Availability of the phase shifts makes the second-order temporal correlation function of the broadened as-generated biphoton field to be almost the same as in case of a single-domain crystal. At the same time, possibility of strong temporal biphoton compression appears further if an additional phase-compensating element is placed after the aperiodically poled crystal.

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