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Kuneva, M.; Tonchev, S.; Dimitrova, P.

doi:10.1023/a:1026167018392

Cited by 6 publications

(7 citation statements)

References 14 publications

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“…This behavior has already been reported in Ref. [15][16][17][18][19][20][21][22][23] and may be related to inhomogeneities of the waveguide which prevent the destructive interference of the SH power. In case of crystal C, a strong asymmetry is observed between upper and lower lobes.…”

Section: Sh Efficiency and Evolution In Timesupporting

confidence: 77%

“…This effect could be related to change in the geometry and the value of the refractive index step due to proton mobility that occurs even at room temperature in the crystal lattice [20][21][22]. In this case, a less strong confinement of the fundamental IR light due to those effects may explain the decrease of the SHG efficiency.…”

Section: Sh Efficiency and Evolution In Timementioning

confidence: 99%

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CW frequency doubling of 1029nm radiation using single pass bulk and waveguide PPLN crystals

Chiodo¹,

Burck²,

Hrabina³

et al. 2013

Optics Communications

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a b s t r a c tFollowing various works on second harmonic process using periodically poled Lithium Niobate crystals (PPLN), we report on the performances comparison between commercial bulk and proton-exchanged waveguide crystals operating at 1029 nm. We use a continuous wave (CW) amplified Yb doped single fiber laser delivering up to 500 mW in single mode regime. In case of bulk crystal we generate 4 mW using 400 mW IR power. The use of waveguide crystal leads to an increase of the harmonic power up to 33 mW with input IR power limited to 200 mW. Nevertheless, this impressive efficiency was affected by the long term degradation of the non-linear waveguide crystal. A decrease of about 40% of the conversion efficiency was observed after 2 years of use, neither associated to the degradation of the coupling efficiency nor to that of the AR coating. This behavior could be attributed to a slow diffusion of protons in the guide.

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Section: Sh Efficiency and Evolution In Timesupporting

confidence: 77%

Section: Sh Efficiency and Evolution In Timementioning

confidence: 99%

CW frequency doubling of 1029nm radiation using single pass bulk and waveguide PPLN crystals

Chiodo¹,

Burck²,

Hrabina³

et al. 2013

Optics Communications

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“…The investigation performed is a logical continuation of the work [5,6] concerning the investigation of new proton sources and technological conditions for producing waveguides by proton exchange in LiNbO 3 and LiTaO 3 .…”

Section: Discussionmentioning

confidence: 99%

“…Sample preparation conditions were like in our previous investigations [5,6] and are described in Table 1.…”

Section: Sample Preparationmentioning

confidence: 99%

Infrared spectra of proton-exchanged waveguides in LiNbO3 and LiTaO3

Kuneva

Tonchev

Atanasov

2005

Materials Science and Engineering: B

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“…[50][51][52][53] The original lines of the substrate are still present, but broadened and changed in intensity (Figure 6(a)). A characteristic phonon frequency of 680 cm À1 originated in distortion of Nb 5þ octahedra towards non polar states [52][53][54] exhibits a high intensity in exposed PE areas. Only the edge of a PE band 53 located at 69 cm À1 is visible within the measured spectral range.…”

mentioning

confidence: 99%

Interface and thickness dependent domain switching and stability in Mg doped lithium niobate

Neumayer

Ivanov

Manzo

et al. 2015

Journal of Applied Physics

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Controlling ferroelectric switching in Mg doped lithium niobate (Mg:LN) is of fundamental importance for optical device and domain wall electronics applications that require precise domain patterns. Stable ferroelectric switching has been previously observed in undoped LN layers above proton exchanged (PE) phases that exhibit reduced polarization, whereas PE layers have been found to inhibit lateral domain growth. Here, Mg doping, which is known to significantly alter ferroelectric switching properties including coercive field and switching currents, is shown to inhibit domain nucleation and stability in Mg:LN above buried PE phases that allow for precise ferroelectric patterning via domain growth control. Furthermore, piezoresponse force microscopy (PFM) and switching spectroscopy PFM reveal that the voltage at which polarization switches from the "up" to the "down" state increases with increasing thickness in pure Mg:LN, whereas the voltage required for stable back switching to the original "up" state does not exhibit this thickness dependence. This behavior is consistent with the presence of an internal frozen defect field. The inhibition of domain nucleation above PE interfaces, observed in this study, is a phenomenon that occurs in Mg:LN but not in undoped samples and is mainly ascribed to a remaining frozen polarization in the PE phase that opposes polarization reversal. This reduced frozen depolarization field in the PE phase also influences the depolarization field of the Mg:LN layer above due to the presence of uncompensated polarization charge at the PE-Mg:LN boundary. These alterations in internal electric fields within the sample cause long-range lattice distortions in Mg:LN via electromechanical coupling, which were corroborated with complimentary Raman measurements. V C 2015 AIP Publishing LLC. [http://dx

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Untitled

Cited by 6 publications

References 14 publications

CW frequency doubling of 1029nm radiation using single pass bulk and waveguide PPLN crystals

CW frequency doubling of 1029nm radiation using single pass bulk and waveguide PPLN crystals

Infrared spectra of proton-exchanged waveguides in LiNbO3 and LiTaO3

Interface and thickness dependent domain switching and stability in Mg doped lithium niobate

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