85% efficiency for cw frequency doubling from 108 to 054 μm
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Abstract:
Conversion efficiency of 85% has been achieved in cw second-harmonic generation from 1.08 to 0.54 microm with a potassium titanyl phosphate crystal inside an external ring cavity. An absolute comparison between the experimental data and a simple theory is made and shows good agreement.Keywords:
Potassium titanyl phosphate
Crystal (programming language)
Frequency Conversion
Conversion efficiency of 85% has been achieved in cw second-harmonic generation from 1.08 to 0.54 microm with a potassium titanyl phosphate crystal inside an external ring cavity. An absolute comparison between the experimental data and a simple theory is made and shows good agreement.
Potassium titanyl phosphate
Crystal (programming language)
Frequency Conversion
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Citations (138)
Abstract Nonlinear second harmonic generation (SHG) and sum frequency generation (SFG) laser spectroscopies have been applied along with conventional surface analytical techniques to study the gaseous interactions on diamond surfaces. Recent results relevant to diamond CVD processes are discussed.
Frequency Conversion
Harmonic
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Optical second harmonic generation (SHG) has been widely employed as a surface probe. Applications of the technique to adsorption, desorption, surface diffusion, molecular orientation and surface chemistry of adsorbed molecules are described as examples. Surface SHG and sum frequency generation (SFG) for surface spectroscopic studies are also described.
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Summary form only given. Recently, we achieved backward second-harmonic generation (SHG) in periodically-poled bulk LiNbO/sub 3/ (PPLN). We have improved the conversion efficiency by about an order of magnitude by using long laser pulses. Here, we report our new results of backward SHG by using periodically-poled potassium titanyl phosphate (PPKTP) waveguide. More importantly, we report our results on first observation of backward third-harmonic generation (THG) due to completely quasi-phase-matched cascaded SHG and sum-frequency generation (SFG) in PPKTP waveguide. This is the first time to achieve backward effective THG where both of SHG and SFG are quasi-phase-matched. Previously, we observed backward THG in PPLN by cascading SHG and SFG. However, only one of these two constituent processes is quasi-phase-matched.
Potassium titanyl phosphate
Waveguide
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Summary form only given. CGA (CdGeAs/sub 2/) crystal is known for its highest second-order nonlinearity (236 pm/V) among any crystals in practical use. It transmits between 2.4 and 18 /spl mu/m and is a perfect candidate for nonlinear-optical frequency conversion in the mid-IR, specifically into the second atmospheric window (8-12 /spl mu/m). In this paper, we report the first demonstration of optical parametric generation in CGA, as well as efficient SHG operation.
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Optical parametric amplifier
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Optical waveguides can be formed in potassium titanyl phosphate (KTiOPO4, KTP) crystals by an ion-exchange process. Waveguides were fabricated in KTP substrates by exchanging rubidium ions for potassium ions. The resulting refractive index profile was measured as a function of diffusion time and temperature. Based on these characterization measurements, the phase-matching properties of the planar waveguide for guided-wave second-harmonic generation were modeled. Second-harmonic generation of blue/green light was observed at wavelengths shorter than the bulk phase-matching limit, in good agreement with the results of numerical modeling.
Potassium titanyl phosphate
Rubidium
Waveguide
Characterization
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Recently there has been much interest in the physical and chemical properties of C 60 , motivated by exciting possibilities for the synthesis of novel materials. Here we report measurements of optical second harmonic (SHG) and infrared-visible sum-frequency generation (SFG) from C 60 films. While second harmonic generation from C 60 films has been previously observed 1 , no attempt has yet been made to identify the relevant second order nonlinear susceptibility elements. We have also investigated the adsorption of atomic hydrogen on the surface of films of C 60 using SHG and SFG. The reactivity of the surface of C 60 films is of importance for the fabrication and stability of new fullerene based materials.
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Harmonic
Reactivity
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We demonstrate Spontaneous Parametric Down-Conversion in one-dimensional periodically poled KTP waveguide with counter-propagating signal and idler beams. This is accomplished by using sub-micron poling and higher-order quasi-phase-matching interactions.
Quasi-phase-matching
Poling
Spontaneous parametric down-conversion
Potassium titanyl phosphate
Frequency Conversion
SIGNAL (programming language)
Optical parametric amplifier
Waveguide
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First generation
Fourth generation
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Materials with periodically-patterned nonlinear susceptibilities offer qualitative improved performance in nonlinear frequency conversion devices. Methods for patterning ferroelectric materials, generation of UV, visible and tunable IR radiation, ultrafast quasi phase matched (QPM) nonlinear optics are discussed.
Frequency Conversion
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