Large enhancement of conversion efficiency using a novel SFG+DFG cascaded wavelength conversion method
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Novel cascaded /spl chi//sup (2)/ wavelength conversions based on sum frequency generation and difference frequency generation (SFG+DFG) is proposed and demonstrated. Conversion efficiency is enhanced by 6 dB as compared with the conventional cascaded SHG+DFG wavelength conversion configuration.Keywords:
Frequency Conversion
Abstract The use of optical second harmonic generation (SHG) measurement of the exploration of dielectric polarization and related surface phenomena is described. Paying attention to the specific nature of material systems on the surface, orientational order parameters are introduced to characterize surface layers, and the SHG enhancement is described in terms of the order parameters. Also the sum‐frequency generation (SFG) and electric‐field‐induced SHG(EFISHG) are described as a tool of probing carrier motions in surface layers. The experimental system is shown with some results.
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Novel cascaded /spl chi//sup (2)/ wavelength conversions based on sum frequency generation and difference frequency generation (SFG+DFG) is proposed and demonstrated. Conversion efficiency is enhanced by 6 dB as compared with the conventional cascaded SHG+DFG wavelength conversion configuration.
Frequency Conversion
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Infrared sum frequency generation (SFG) and second harmonic generation (SHG) has found widespread use as surface sensitive probes [1]. As second order nonlinear processes, SFG and SHG are forbidden in the bulk of centrosymmetric media but allowed at its interface where the symmetry is broken. We have used the techniques to study adsorption of H and CH X on diamond. In particular, with the help of a tunable infrared laser, the infrared-visible SFG allows us to measure in-situ surface vibrational spectra and hence identify the adsorbed species. The results provide us with useful insight about possible mechanisms governing the chemical vapor deposition (CVD) process for diamond growth.
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The second harmonic generation (SHG) from one-dimensional periodic optical superlattice embedded into air is studied. It is found that the SHG conversion efficiency can be modulated by the field of fundamental wave (FW). In order to investigate the effect of the FW on the SHG, nonlinear non-polarized material is added in back of a crystal and the corresponding SHG conversion efficiency is calculated. Results show that the SHG conversion efficiency can be enhanced significantly when transmission resonance takes place, however, for different resonant peaks the values are different. In addition, the SHG conversion efficiencies can be modulated about 5 times by adjusting the thickness of added material.
Frequency Conversion
Crystal (programming language)
Second-harmonic imaging microscopy
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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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The dependence of second-harmonic-generation (SHG) conversion efficiency on the intercrystal phase shift between two nonlinear crystals is analyzed with heuristic theory, and a novel scheme for SHG with two cascaded nonlinear crystals and a polarization modulator is proposed. More than 30 W output power is obtained experimentally at 532 nm with 70% external doubling efficiency. To the best of our knowledge, this is the highest conversion efficiency obtained with LiB3O5 crystal external frequency doubling. This scheme provides a simple and effective method for improving second-harmonic conversion efficiency.
Frequency Conversion
Crystal (programming language)
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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. 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.
Frequency Conversion
Optical parametric amplifier
Crystal (programming language)
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We report highly-nonlinear ultra-thin metasurfaces based on coupling of modes in plasmonic nanoresonators with intersubband nonlinearities with phase-control of nonlinear optical response. Nonlinear susceptibility >106 pm/V and conversion efficiencies ~0.1% were measured for second-harmonic generation.
Physical optics
Frequency Conversion
Ultrafast optics
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First generation
Fourth generation
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