Partial spectral and temporal coherence of plane-wave pulse trains in second-harmonic generation

2021 ◽  
Author(s):  
Henri Atte Pesonen ◽  
Juha-Matti Huusko ◽  
Xiaorun Zang ◽  
Ari T Friberg ◽  
Jari Turunen ◽  
...  
Keyword(s):  
Plane Wave ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Temporal Coherence ◽  
Partial Coherence ◽  
Sh Wave ◽  
Wave Pulse ◽  
Pulse Trains ◽  
Degree Of Coherence

Abstract We study the spectral and temporal coherence effects in the passage of a Gaussian Schell-model (GSM) scalar, plane-wave pulse train through a slab of nonlinear optical crystal exhibiting second-harmonic generation. We show that due to the nonlinear interaction the temporal and spectral degrees of coherence of the fundamental (F) and second-harmonic (SH) pulse trains at the exit facet may deviate markedly from the GSM and the global degree of coherence of the SH wave generally decreases with increasing incident F beam intensity. In addition, we find that due to the partial coherence of the incident GSM field the transmitted SH wave may show a double-peaked intensity distribution.

BROADBAND FREQUENCY MIXING AND SECOND-HARMONIC GENERATION IN 2-METHYL-4-NITROANILINE THIN CRYSTAL FROM 250 FS PULSES

2006 ◽  
Vol 15 (04) ◽  
pp. 491-499
Author(s):  
T. BEN-MESSAOUD ◽  
J. DESFORGES ◽  
S. GAUVIN
Keyword(s):  
Plane Wave ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Wave Mixing ◽  
Experimental Proof ◽  
Highly Nonlinear ◽  
Simple Formalism ◽  
Thin Crystal ◽  
Broadband Frequency

In this paper, we present the experimental proof that even for highly nonlinear (NL), such as 2-methyl-4-nitroaniline (MNA), wave mixing has negligible effect on the second-harmonic generation (SHG) using 250 fs fundamental pulses. We explain our experimental results with a simple formalism based on monochromatic plane wave (MPW).

scholarly journals Noise Analysis of Second-Harmonic Generation in Undoped and MgO-Doped Periodically Poled Lithium Niobate

2008 ◽  
Vol 2008 ◽  
pp. 1-10 ◽  
Author(s):  
Yong Wang ◽  
Jorge Fonseca-Campos ◽  
Wan-guo Liang ◽  
Chang-Qing Xu ◽  
Ignacio Vargas-Baca
Keyword(s):  
Lithium Niobate ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Fundamental Wave ◽  
Sh Wave ◽  
Periodically Poled ◽  
Periodically Poled Lithium Niobate ◽  
Noise Characteristics ◽  
532 Nm

Noise characteristics of second-harmonic generation (SHG) in periodically poled lithium niobate (PPLN) using the quasiphase matching (QPM) technique are analyzed experimentally. In the experiment, a0.78 μm second-harmonic (SH) wave was generated when a 1.56 μm fundamental wave passed through a PPLN crystal (bulk or waveguide). The time-domain and frequency-domain noise characteristics of the fundamental and SH waves were analyzed. By using the pump-probe method, the noise characteristics of SHG were further analyzed when a visible light (532 nm) and an infrared light (1090 nm) copropagated with the fundamental light, respectively. The noise characterizations were also investigated at different temperatures. It is found that for the bulk and waveguide PPLN crystals, the SH wave has a higher relative noise level than the corresponding fundamental wave. For the same fundamental wave, the SH wave has lower noise in a bulk crystal than in a waveguide, and in MgO-doped PPLN than in undoped PPLN. The 532 nm irradiation can lead to higher noise in PPLN than the 1090 nm irradiation. In addition, increasing temperature of device can alleviate the problem of noise in conjunction with the photorefractive effect incurred by the irradiation light. This is more significant in undoped PPLN than in MgO-doped one.

Test of directional photoionisation models of second harmonic generation in optical fibres

1992 ◽  
Vol 139 (2) ◽  
pp. 133 ◽  
Author(s):  
N.M. Lawandy ◽  
T.J. Driscoll ◽  
C.L. Adler ◽  
N.M. Lawandy
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Optical Fibres
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