Second harmonic generation (SHG) is a nonlinear optical process that occurs when non-centrosymmetric materials are probed with high-energy laser excitation. The process was discovered in quartz in 1962 and it occurs when two photons at the frequency of the laser excitation combine to emit a third...
Second-harmonic generation was observed in an elastic surface wave propagating in the y direction on the x surface of α-quartz. The waves were generated and detected by means of interdigital electrode transducers. The fundamental frequency was 9 MHz. The amplitude of the second-harmonic signal ...
Thus, the second harmonic in an almost lossless medium vanishes upon arrival at the generating transducer because the reflection reverses the phase angle 2φrelative to φ, where φand φare the phase angles, respectively, of the fundamental and the second harmonic. When the thickness of the ...
The second order nonlinear susceptibility tensor element {xxx} of (2) () in 卤-quartz is calculated using a full band structure approach. A scissor operator is applied to the band structure obtained from the first-principles OLCAO method using local density approximation (LDA). The calculated ...
The second order nonlinear susceptibility tensor element {xxx} of (2) () in ±-quartz is calculated using a full band structure approach. A scissor operator is applied to the band structure obtained from the first-principles OLCAO method using local density approximation (LDA). The calculated ...
Second harmonic generation SHG may be used as an experimental technique in structural crystallography. By applying a bond polarizability model to the nonlinear optical coefficients of quartz, the rotation of the SiO4 tetrahedron with temperature is `observed'. Additionally, the oxygen positional parameter...
Interaction of Nitrate, Barium, Strontium and Cadmium Ions with Fused Quartz/Water Interfaces Studied by Second Harmonic Generation Inorganic anions and cations are ubiquitous in environmental chemistry. Here, we use second harmonic generation to track the interaction of the environment... PL Hayes,JN...
Hyper-Rayleigh scattering (HRS), or incoherent second-harmonic generation, from Langmuir films of C60 and its derivatives deposited upon fused-quartz subst... ED Mishina,TV Misuryaev,AA Nikulin,... - 《Journal of the Optical Society of America B》 被引量: 16发表: 1999年 Four‐photon lase...
In the QEPAS system, wavelength modulation and second harmonic (2 f) demodulation technology were employed to suppress effectively background noise. A high-frequency sine wave and a low-frequency ramp wave were combined and then sent into the laser controller for wavelength modulation of the ...
Deep-ultraviolet second harmonic generation in a conventional crystal quartz by freeing phase-matching in nonlinear optics (APP) concept was proposed for the phase-matching in nonlinear optics and experimentally demonstrated the APP phase-matched second harmonic generation with a conventional crystal quartz...