Accurate measurements of longitudinal temperature distribution of PPLN crystal in the process of second-harmonic generation

2020 ◽  
Vol 59 (24) ◽  
pp. 7330
Author(s):  
Grigorii Yu. Ivanov ◽  
Pavel S. Cherpak ◽  
Aleksey V. Konyashkin ◽  
Oleg A. Ryabushkin
Keyword(s):  
Temperature Distribution ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Ppln Crystal ◽  
Longitudinal Temperature

Second harmonic generation in a ppln crystal pumped by an ytterbium doped fiber laser

2006 ◽  
Author(s):  
Maribel Fernandez-Resenos ◽  
Gilberto Anzueto-Sanchez ◽  
Alejandro Martinez-Rios ◽  
Ismael Torres-Gomez ◽  
Romeo Selvas-Aguilar
Keyword(s):  
Second Harmonic Generation ◽  
Fiber Laser ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Ppln Crystal

scholarly journals Simulation of the thermo-optic coupling effect in mid-infrared second harmonic generation of ZnGeP2 crystal

2015 ◽  
Vol 33 (2) ◽  
pp. 391-396
Author(s):  
Wenchao Zhang ◽  
Yachen Gao ◽  
Jinjer Huang ◽  
Guohua Zhang ◽  
Y.M. Andreev ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Conversion Efficiency ◽  
Coupling Effect ◽  
Second Harmonic ◽  
Great Influence ◽  
Mid Infrared ◽  
Cooling Conditions ◽  
Conversion Efficiencies

AbstractThe thermo-optic coupling process of second harmonic generation was numerically simulated in ZnGeP2 crystals pumped by a pulsed CO2 laser at the wavelength of 9.6 μm, under the strong and weak cooling conditions. The conversion efficiencies, temperature distributions were calculated during the evolution of the thermo-optic coupling. The results showed that the thermooptic coupling was weak in the strong cooling condition, which nearly did not disturb the conversion processes and temperature distribution, while in the weak cooling case, the temperature distribution showed a great influence on the conversion efficiency and light intensity. Finally, it was found that compensation of the phase mismatch induced by the thermal effect can well recover the conversion efficiency.

scholarly journals Boosting and Taming Wave Breakup in Second Harmonic Generation

2021 ◽  
Vol 9 ◽  
Author(s):  
Raphaël Jauberteau ◽  
Sahar Wehbi ◽  
Tigran Mansuryan ◽  
Katarzyna Krupa ◽  
Fabio Baronio ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Wave Breaking ◽  
Second Harmonic ◽  
Pump Energy ◽  
Beam Shape ◽  
Fundamental Beam ◽  
Ppln Crystal ◽  
Spatially Extended ◽  
Local Intensity

Modulation instability is a universal phenomenon that can be found in a wide variety of nonlinear systems where, in the presence of a noise seed, peaks of random intensities can be generated. Several dynamical systems admit exact solutions in the form of breathers or solitons on a finite background. The vast majority of soliton studies has been restricted so far to one-dimensional systems. In contrast, the occurrences of localized structures in fully spatiotemporal systems has been only sporadically explored. In this work, we experimentally study the conditions for the wave-breaking of spatially extended optical beams in the process of second harmonic generation. Whenever the pump energy of the picosecond-long fundamental beam reaches a critical level, the beam shape at the second harmonic in a KTP crystal breaks into small filaments. These filaments exhibit extreme local intensity peaks, and their statistical distribution can be modified by the input energy of the fundamental beam. Moreover, by analyzing similar wave-breaking dynamics in a PPLN crystal in the presence of a higher nonlinear quadratic response, we observe that the spatial beam breaking may even gradually vanish as the laser intensity grows larger, leading to a spatial reshaping into a smooth and wider beam, accompanied by a substantial broadening of its temporal spectrum.

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
Sign in / Sign up

Export Citation Format

Share Document