Polarization reversal and domain anisotropy in flux-grown KTiOPO4 and isomorphic crystals

2001 ◽  
Vol 16 (5) ◽  
pp. 1493-1499 ◽  
Author(s):  
P. Urenski ◽  
G. Rosenman ◽  
M. Molotskii
Keyword(s):  
Nonlinear Optical ◽  
Electronic Conductivity ◽  
Polarization Reversal ◽  
High Temperature Region ◽  
Periodically Poled ◽  
Screening Process ◽  
Domain Structures ◽  
Domain Wall Velocity ◽  
Specific Temperature ◽  
Two Temperature

Spontaneous polarization reversal and domain structures of flux-grown ferroelectric KTiOPO4 and isomorphic crystals were studied. Two temperature regions with dominant either ionic or electronic conductivity were found. It was shown that in the high-temperature region mobile cations contributed sufficiently to internal screening process. The ionic leakage current was suppressed at a specific temperature point for each studied crystal. High crystallographic asymmetry of domain wall velocity was observed. This shows that the electrode pattern should be properly oriented relative to the crystal axes of KTiOPO4 and its isomorphs for fabrication of periodically poled domain configurations used in nonlinear optical conversions.

scholarly journals “Seeing Is Believing”—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 288
Author(s):  
Sven Reitzig ◽  
Michael Rüsing ◽  
Jie Zhao ◽  
Benjamin Kirbus ◽  
Shayan Mookherjea ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Second Harmonic ◽  
Imaging Techniques ◽  
Piezoresponse Force Microscopy ◽  
Periodically Poled ◽  
Near Surface ◽  
Domain Structures ◽  
Depth Analysis ◽  
Improved Performance ◽  
Quantum Optical

Nonlinear and quantum optical devices based on periodically-poled thin film lithium niobate (PP-TFLN) have gained considerable interest lately, due to their significantly improved performance as compared to their bulk counterparts. Nevertheless, performance parameters such as conversion efficiency, minimum pump power, and spectral bandwidth strongly depend on the quality of the domain structure in these PP-TFLN samples, e.g., their homogeneity and duty cycle, as well as on the overlap and penetration depth of domains with the waveguide mode. Hence, in order to propose improved fabrication protocols, a profound quality control of domain structures is needed that allows quantifying and thoroughly analyzing these parameters. In this paper, we propose to combine a set of nanometer-to-micrometer-scale imaging techniques, i.e., piezoresponse force microscopy (PFM), second-harmonic generation (SHG), and Raman spectroscopy (RS), to access the relevant and crucial sample properties through cross-correlating these methods. Based on our findings, we designate SHG to be the best-suited standard imaging technique for this purpose, in particular when investigating the domain poling process in x-cut TFLNs. While PFM is excellently recommended for near-surface high-resolution imaging, RS provides thorough insights into stress and/or defect distributions, as associated with these domain structures. In this context, our work here indicates unexpectedly large signs for internal fields occurring in x-cut PP-TFLNs that are substantially larger as compared to previous observations in bulk LN.

Nonlinear optical characterization of spontaneously grown domain structures in SBO crystals

2007 ◽  
Author(s):  
A. S. Aleksandrovsky ◽  
V. G. Arkhipkin ◽  
I. E. Kuzey ◽  
A. M. Vyunishev ◽  
A. I. Zaitsev ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Optical Characterization ◽  
Domain Structures

Micro-patterned Domain Structures of Nonlinear Optical Side-group Polymers by Corona Poling

2002 ◽  
Vol 41 (Part 1, No. 8) ◽  
pp. 5235-5236 ◽  
Author(s):  
Suck-Hyun Lee ◽  
O-Pil Kwon ◽  
Young-Hee Won ◽  
Doo-Jin Cho
Keyword(s):  
Nonlinear Optical ◽  
Side Group ◽  
Domain Structures ◽  
Corona Poling

QUASI-PHASE-MATCHED DIFFERENCE-FREQUENCY GENERATION IN NONLINEAR OPTICAL POLYMER WAVEGUIDES

2004 ◽  
Vol 13 (03n04) ◽  
pp. 391-396 ◽  
Author(s):  
MYUNG-HYUN LEE ◽  
JUNG JIN JU ◽  
MIN-SU KIM ◽  
JUNG YUN DO ◽  
SEUNG KOO PARK ◽  
...  
Keyword(s):  
Communication Systems ◽  
Nonlinear Optical ◽  
Optical Fiber Communication ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Wavelength Converter ◽  
Polymer Waveguides ◽  
Periodically Poled ◽  
Chain Polymer ◽  
Frequency Generation

Nonlinear optical (NLO) polymer is emerging as a new alternative material for a wavelength converter in optical fiber communication systems. We designed and synthesized a polyetherimide-based side-chain polymer with a 4-(dialkylamino)-4′(-(styrylsulfonyl)-stilbene chromophore as a new NLO polymer. We designed and fabricated periodically-poled NLO polymer waveguides for the wavelength converter. Difference-frequency generation (DFG) process with a quasi-phase-matching (QPM) scheme was used. For the first time, we demonstrated a wavelength converter with a DFG conversion efficiency of -47 dB in the periodically-poled NLO polymer waveguides, operating at ~ 1.55 μm.

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