• Thumbnail for Second-harmonic generation
    Second-harmonic generation (SHG), also known as frequency doubling, is the lowest-order wave-wave nonlinear interaction that occurs in various systems...
    51 KB (6,842 words) - 16:44, 21 March 2025
  • Thumbnail for Harmonic generation
    Harmonic generation (HG, also called multiple harmonic generation) is a nonlinear optical process in which n {\displaystyle n} photons with the same frequency...
    7 KB (786 words) - 16:36, 5 April 2024
  • Surface second harmonic generation is a method for probing interfaces in atomic and molecular systems. In second harmonic generation (SHG), the light frequency...
    22 KB (2,971 words) - 19:10, 8 October 2024
  • Thumbnail for Second-harmonic imaging microscopy
    Second-harmonic imaging microscopy (SHIM) is based on a nonlinear optical effect known as second-harmonic generation (SHG). SHIM has been established as...
    48 KB (5,024 words) - 15:51, 7 January 2025
  • _{1}+\hbar \omega _{2}} A special case of sum-frequency generation is second-harmonic generation, in which ω 1 = ω 2 {\displaystyle \omega _{1}=\omega _{2}}...
    3 KB (429 words) - 18:28, 18 March 2023
  • High-harmonic generation (HHG) is a non-linear process during which a target (gas, plasma, solid or liquid sample) is illuminated by an intense laser...
    22 KB (2,915 words) - 09:43, 28 February 2025
  • wavelength of the initial photons. The half-harmonic generation process is the inverse of second-harmonic generation and can occur in optical parametric oscillators...
    3 KB (396 words) - 02:41, 28 November 2023
  • Kleinman symmetry (category Second-harmonic generation)
    terms required to fully describe the second order polarisation response. Nonlinear optics Second-harmonic generation Crystal symmetry Dailey, Christopher...
    4 KB (578 words) - 09:09, 13 January 2024
  • Thumbnail for Nonlinear optics
    observation of two-photon absorption at Bell Labs and the discovery of second-harmonic generation by Peter Franken et al. at University of Michigan, both shortly...
    53 KB (6,736 words) - 22:47, 7 June 2024
  • Thumbnail for Optical autocorrelation
    autocorrelation signal is generated by the nonlinear process of second-harmonic generation (SHG). Other techniques based on two-photon absorption may also...
    10 KB (1,161 words) - 09:37, 28 February 2025
  • Optical frequency multiplier (category Second-harmonic generation)
    to achieve the conversion: second-harmonic generation (SHG, also called frequency doubling), or sum-frequency generation which sums two non-similar frequencies...
    3 KB (296 words) - 06:11, 2 September 2024
  • Quasi-phase-matching (category Second-harmonic generation)
    compute the nonlinearly-generated signal amplitude in the case of second harmonic generation, where a strong pump at ω 1 {\displaystyle \omega _{1}} produces...
    14 KB (2,548 words) - 09:29, 10 May 2024
  • Thumbnail for Potassium titanyl phosphate
    Potassium titanyl phosphate (category Second-harmonic generation)
    transmission out to 4500 nm where the crystal is effectively opaque. Its second-harmonic generation (SHG) coefficient is about three times higher than KDP. It has...
    7 KB (641 words) - 23:07, 18 May 2024
  • in 1987 by Yuen-Ron Shen and his students as an extension of second harmonic generation spectroscopy and rapidly applied to deduce the composition, orientation...
    15 KB (2,590 words) - 14:50, 3 February 2025
  • Thumbnail for Monopotassium phosphate
    Monopotassium phosphate (category Second-harmonic generation)
    used in optical modulators and for non-linear optics such as second-harmonic generation (SHG). Potassium dideuterium phosphate (KDP), with slightly different...
    10 KB (673 words) - 13:50, 15 April 2025
  • Kelvin probe force microscopy (KFM) and the electric-field induced second harmonic generation. In the semiconductor industry, Cross-Bridge Kelvin Resistor(CBKR)...
    18 KB (1,854 words) - 03:41, 23 October 2024
  • used as nonlinear optical materials. They are more efficient at second-harmonic generation than crystals of the same material without periodic structure...
    2 KB (194 words) - 23:31, 18 March 2024
  • Thumbnail for Quantum dot
    transistors, solar cells, LEDs, lasers, single-photon sources, second-harmonic generation, quantum computing, cell biology research, microscopy, and medical...
    117 KB (13,793 words) - 06:52, 5 April 2025
  • addition, other non-linear effects besides second harmonic generation may be used, such as third harmonic generation (THG) or polarization gating (PG). These...
    12 KB (1,924 words) - 16:34, 12 September 2024
  • Thumbnail for Centrosymmetry
    as the piezoelectric effect and the frequency doubling effect (second-harmonic generation). In addition, in such crystals, one-photon absorption (OPA) and...
    4 KB (392 words) - 18:50, 27 February 2024
  • Thumbnail for Two-photon excitation microscopy
    two-photon-based lithography. Using two-photon fluorescence and second-harmonic generation–based microscopy, it was shown that organic porphyrin-type molecules...
    35 KB (3,552 words) - 00:29, 2 April 2025
  • Thumbnail for Surface plasmon
    based on surface plasmons were developed. In surface second harmonic generation, the second harmonic signal is proportional to the square of the electric...
    14 KB (1,403 words) - 11:33, 15 March 2025
  • Thumbnail for Optical rectification
    rectification also occurs on metal surfaces by similar effect as surface second harmonic generation. The effect is however influenced e. g. by nonequilibrium electron...
    6 KB (611 words) - 23:54, 17 June 2020
  • self-organisms. It is also a nonlinear optical material with second harmonic generation efficiency 1.68 times that of KDP. L-arginine maleate dihydrate...
    3 KB (318 words) - 20:16, 30 December 2023
  • Frequency synthesizer (category Second-harmonic generation)
    frequencies. Some approaches include phase locked loops, double mix, triple mix, harmonic, double mix divide, and direct digital synthesis (DDS). The choice of approach...
    23 KB (2,855 words) - 17:10, 1 April 2025
  • Thumbnail for Gallium(II) selenide
    structure, similar to that of GaS. It is a photoconductor, a second harmonic generation crystal in nonlinear optics, and has been used as a far-infrared...
    10 KB (1,065 words) - 09:43, 27 September 2023
  • Thumbnail for Surface plasmon polariton
    components in chip-scale photonic circuits. In surface second harmonic generation, the second harmonic signal is proportional to the square of the electric...
    39 KB (5,113 words) - 11:18, 15 March 2025
  • Thumbnail for Peter Franken
    at the University of Michigan observed for the first time the second-harmonic generation. This event launched a golden age in optical physics that has...
    3 KB (221 words) - 16:23, 7 January 2025
  • Thumbnail for Lithium niobate
    Lithium niobate (category Second-harmonic generation)
    between 5 and 35 μm. The shorter periods of this range are used for second-harmonic generation, while the longer ones for optical parametric oscillation. Periodic...
    22 KB (2,248 words) - 18:29, 19 February 2025
  • non-linear optical processes such as two-photon fluorescence or second harmonic generation. In scanning multiphoton microscopes the high intensities are...
    13 KB (1,699 words) - 19:27, 18 May 2024