A method to obtain the maximum optical parametric generation conversion bandwidth at room temperature

Abstract

The invention discloses a method for obtaining the maximum optical parameter generation conversion bandwidth at room temperature. In the method, the material used for the crystal is lithium niobate crystal, which has a non-periodic structure. At 24 degrees Celsius, the pump light of 0.9 microns is selected Wavelength, through the designed aperiodic structure to make up for the phase mismatch between the wavelength degradation point of the pump light and the matching point of the wavelength group velocity of the signal light and idler light, so that the phase mismatch between the three can meet the optical parameter When the phase matching condition is generated, the maximum optical parameter generation bandwidth of 2159 nanometers can be obtained. The crystal shape is a cuboid structure. When used, the incident direction of the beam is perpendicular to the polarization direction, and along the incident direction of the beam, it is polarized into unit domains of equal length. The polarization direction of each unit domain can be selected upward or downward. The crystal can realize larger and flatter optical parameter generation conversion bandwidth between the group velocity matching points of signal light and idler light under the condition of quasi-phase matching.

Description

technical field [0001] The invention relates to a method for obtaining the conversion bandwidth of maximum optical parameter generation at room temperature. Background technique [0002] Optical parameter generation has a wide range of applications in the fields of laser spectroscopy and trace gas detection in the mid-infrared spectral region [1, Masashi Abe, Yoshiki Nishida, Osamu Tadanaga, Akio Tokura, Hirokazu Takenouchi, Optics Letter, 2016 41 1380-1383], [2. M. Vainio, L. Halonen, Physical Chemistry Chemical Physics, 2012 00 1-3]. However, when quasi-phase-matching technology is used to generate optical parametric lasers, only a narrow bandwidth can be obtained because of the efficiency conversion problem. In response to this problem, many solutions have been proposed at home and abroad, such as non-collinear beam devices [Bortz M L, Fujimura M, Fejer M M.Increased acceptance bandwidth for quasi-phasematched second harmonic generation in LiNbO3waveguides[J]. E1electron...

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Problems solved by technology

However, the main problem in the above methods is that the expansion of the wavelength conversion bandwidth and the flatness of the bandwidth still cannot be solved and improved uniformly, that is, while the bandwidth is getting larger, the top, especially the degeneration point corresponding to the pump light ( twice the wavelength of the pump light) will become uneven

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