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Nonlinear Optical Effects in Optical Superlattices and Construction of Optical Superlattices

Author: LiuWenJun
Tutor: LiJian
School: Shandong Normal University
Course: Optics
Keywords: Nonlinear frequency conversion Optical superlattice Quasi-phase matching Frequency multiplication PPLN-OPO Period tuning Temperature tuning Accept the bandwidth.
CLC: O437
Type: Master's thesis
Year: 2003
Downloads: 166
Quote: 0
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Abstract


The development of modern optical technology, newer and higher requirements on the laser. Broaden the range of wavelength of the laser output, the most commonly used, one of the most effective method is the use of the frequency of the nonlinear crystal transform techniques. People often use the birefringence characteristics of the anisotropic crystal phase matching (PM) techniques and artificially prepared on the nonlinear crystal, the periodic structure of the quasi-phase matching (QPM) technology to achieve efficient frequency conversion. Can take advantage of the largest second-order nonlinear optical crystal polarization tensor quasi-phase-matching technique has its unique advantages, such as PPLN, PPLT, PPKTP with nonlinear susceptibility tensor are d 33 < / sub>, its effective nonlinear coefficient, an order of magnitude higher than the ordinary nonlinear optical medium (eg, BBO, LBO, KTP) and can artificially flexible design modulation cycle by cycle design frequency conversion can range covering the quasi-phase-matching medium the whole of the transparent band, select no walk-off effect to solve the difficult problem of the conventional PM, broadening the range of applications of the nonlinear crystal, and greatly improve the efficiency of frequency conversion, has become a research of the nonlinear optical material and solid state lasers hot spots. Due to the successful use of the applied electric field polarization method greatly reduces the the polarization difficulty and cost, especially the body periodically poled material, because of its range of light through large, high conversion efficiency, develop more rapidly. At present, the use of quasi-phase-matching techniques to achieve a pulse, quasi-continuous and continuous optical frequency conversion. QPM technology from initial development to achieve multiplier mixer, OPO optical pulse shaping nonlinear optical applications. Convenient and efficient diode-pumped laser with quasi-phase-matching techniques combined, has become a trend of the development of a new compact solid-state lasers. Cycle polarization technology maturation and development of a large area of ??uniform short domain structure periodically poled crystal preparation has become possible, which makes even higher order QPM will be realized only need the original third-order short wavelength conversion with a first-order QPM realized. In addition, the the infrared band light source, optical parametric oscillator using PPLN made have important applications in the field of military confrontation, the detection of atmospheric environment, medicine, and spectroscopic value. PPLN-OPO the period tuning and temperature tuning characteristics of domestic fresh reports, this paper studied theoretically the optical superlattice SHG from theoretical and experimental study of the optical parametric oscillator (OPO) effect, the following major elements : 1. Expounded the principle of nonlinear frequency conversion, phase matching and quasi-phase-matching technique, highlighting the the optical superlattice works of periodic and quasi-periodic. 2. As the starting point to the wave equation, derived optical superlattice multiplier theory, focus on the relationship between PPLN cycle with temperature and wavelength, explore the cycle of bandwidth, temperature bandwidth, visually given the polarization cycle with the pump wavelength relationship for research octave devices and media preparation and frequency conversion experiments have important guiding significance. Summary 3. PPLN-OPO in different pump band tuning characteristics, focusing on the temperature the tuner and cycle tuning characteristics of plus LN-OPO PPLN-OPO the temperature bandwidth Cycle bandwidth, theoretically based optical parametric oscillation theory a PPLN-OPO conversion efficiency and output characteristics of the signal light. LD-pumped Nd: YVO fiber-coupled output. Crystal, acousto-optic Q obtain 1064urn pulse output pump multi-cycle PPLN-OPO, tunable signal light output, the experimental results with theoretical calculations coincide. 4. Explore various polarization preparation method, and according to the external electric field polarization method theory, the design of the preparation pump light 1064nLrn, and polarization parameters multiplier PPLN.

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CLC: > Mathematical sciences and chemical > Physics > Optics > Nonlinear optical ( light and matter)
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