摘要
本论文主要对基于PPLN的准相位匹配内腔光学参量产生进行了相关的理论和实验研究。
光学参量振荡器是可调谐频率变换的一个热点。近年来,随着周期极化晶体制作的成熟,准相位匹配光学参量振荡器得以实现。多年来,对于内腔光学参量过程的研究多为内腔光学参量振荡,而对于内腔光学参量产生,报道和关注的都较少。基于内腔光学参量产生(IOPG)的显著优点:非线性晶体直接置于泵浦光谐振腔内,利用腔内极高的泵浦光功率密度可以来降低光参量过程中的阈值以及提高整个系统的转换效率,我们进行了这方面的一些工作,实现宽调谐的光学参量变换。
在本论文中主要介绍和进行了以下工作:
1.介绍了宽带可调谐光源的发展及其应用背景,周期极化晶体。介绍了周期极化晶体的制作方法和不同类型。
2.准相位匹配技术:介绍了准相位匹配技术的有点,并从耦合波方程出发说明了准相位匹配技术的原理。光学参量振荡器:光学参量振荡器的发展、基本原理。
3.通过对三镜折叠腔的理论计算推导,确定了实验中谐振腔的各项参数。
4.对基于周期极化铌酸锂的内腔光学参量产生进行了实验研究。报道了实验结果。采用长18.7mm周期28.93μm的单周期PPLN。信号光输出波长调谐范围为1.493-1.538μm,闲频光调谐范围为3.707-3.456μm。换用多周期的PPLN进行的进一步实验后。得到了信号光输出更长范围内的调谐为1.384-1.541μm。
5.对实验结果进行了总结,并提出了进一步工作的展望。
In this dissertation, we theoretically and experimentally investigate intra-cavity optical parametric generator with periodically poled lithium niobate.
Optical parametric oscillators (OPO) have long held promise as potentially attractive sources of tunable IR radiation. The processing techniques developed in periodically poled materials allowed demonstration of a variety of QPM-OPO. There are lots of researches about quasi-phase-matched Intracavity optical parametric oscillator (IOPO), but Intracavity optical parametric generator (IOPG) is neglected, IOPG is easy to realize low-pump-threshold because of high density of power in the cavity. So we have done some researches about IOPG.
In this paper, the research work and discovery are described as following:
1. The development and applications of tunable coherent IR radiation are Introduced, periodically poled materials. At the same time, the different kinds of PPLN and the latest development at home and abroad are presented.
2. We introduce the advantages and physical means of QPM, and from the coupled equations, describe the theory of QPM, The development and applications of optical parametric oscillations are introduced, as well as the basic theory.
3. We designed a folded 3-mirror laser resonator. The expressions to calculate the radius and the place of laser waist are presented.
4. We report the experiment on quasi-phase-matched intra-cavity optical parametric generator with PPLN, the signal wavelength can be tuned form 1.493 to 1.538μm. when using another multi-periods PPLN, the result is form 1.384μm to 1.541μm
5. Describing the context of this work in historical perspective and in relation to current research, and discussing prospects for future work.
引文
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