【作者】 孙冰；

【导师】 丁欣；

【作者基本信息】 天津大学 ， 光学工程， 2021， 博士

【摘要】 波长位于560-600 nm范围内的黄光光源在工业、科研、医疗和国防等领域具有重要应用。本论文对基于和频、光学参量振荡及受激拉曼散射三种当前实现全固态黄光光源的主要技术进行了理论和实验研究,基于其各自的优势分别实现了小型化、高效、波长可连续调谐及高功率的全固态黄光光源。具体内容如下:1.以实现小型化和高效率黄光为目的,设计并搭建了基于共轴双Nd:YAG晶体的端面泵浦和频黄光光源以及基于Nd:YVO₄晶体的波片法和频黄光光源。前者通过优化双波长增益介质的有效长度,实现1064和1319 nm双波长激光同时起振,缓解传统内腔和频方案中的模式竞争效应和损耗机制,从而有效提高了激光器的转换效率,15 W泵浦功率下实现了657 m W连续波589 nm黄光输出。后者通过旋转腔内插入的波片调节1064及1342 nm的受激发射截面,实现两个波长激光功率的平衡。过程中无需对强增益谱线引入更多的损耗,从而有效提高了激光器的整体效率,5 W泵浦功率下实现了224 m W连续波593 nm黄光输出。2.设计并实现了基于内腔倍频单谐振光学参量振荡器的波长可调谐黄光光源。建立了内腔倍频单谐振光学参量振荡器的耦合波方程,并根据数值模拟结果分析了内腔倍频单谐振光学参量振荡器的动力学过程。确定了基于532 nm激光泵浦KTP晶体（77°,0°）实现参量光运转后再结合KTP晶体（71.1°,0°）内腔倍频的实验方案,在入射泵浦功率21.1 W,重复频率10 k Hz时获得了最大2.37 W的575.6 nm黄光输出,光光转换效率为11.2%,线宽为0.5 nm,脉宽为32.1 ns,在x、y方向上的光束质量因子分别为2.98和3.18,波长调谐范围573-578 nm。3.设计并搭建高功率侧面泵浦Nd:YAG-YVO₄-KTP全固态内腔拉曼黄光激光器。采用885 nm共振泵浦方式,并结合Z型折叠腔结构,实现对激光器热效应的有效管理,扩大了基频光稳区范围。在入射泵浦功率233.0 W、声光调Q脉冲重复频率10 k Hz时,实现了平均功率为13.7 W的588 nm黄光输出,转换效率为5.9%,黄光线宽～0.05 nm,脉冲宽度12.5 ns。4.设计并搭建了基于调制泵浦的端泵Nd:YVO₄-LBO内腔倍频自拉曼黄光激光器,采用878.6 nm共振泵浦结合调制准连续泵浦的方式缓解热效应,有效提高了系统功率水平。通过优化泵浦光占空比,在32 W泵浦功率下连续588nm黄光平均输出功率2.85 W,转换效率为8.9%,脉冲重复频率90 k Hz时黄光平均输出功率7.6 W,转换效率为23.8%,相对连续波泵浦均得到明显提升。更多还原

【Abstract】 The yellow light sources in 560-600 nm wavelength range have important applications in industry,scientific research,medical treatment and defence,which has drawn intense attention.This thesis focuses on all-solid-state yellow laser source.The theoretical and experimental research is carried out on the three main techniques for all-solid-state yellow source of sum-frequency mixing（SFM）,optical parametric oscillator（OPO）and stimulated Raman scattering（SRS）.With the three techniques,the yellow sources with compact structure,high efficiency and tunable wavelength are demonstrated,respectively.The detailed work is as follows:1.Efficient SFM miniature yellow sources with co-axial dual Nd:YAG fundamental laser scheme and Nd:YVO₄ dual-wavelength with waveplate scheme are designed and demonstrated.For the former one,the crystal lengths are optimized to balance the dual wavelength laser gain at 1064 nm and 1319 nm,instead of the loss scheme in common dual wavelength lasers,thus the conversion efficiency can be enhanced.657 m W continuous wave（CW）yellow output at 589 nm is obtained under15 W diode pump power.For the later one,the balance between the two fundamental laser（1064 and 1342 nm）powers is realized by rotating the waveplate in the cavity,without introducing extra losses.224 m W CW output at 593 nm is obtained under 5 W diode pump.2.A wavelength tunable KTP OPO in yellow range,pumped at 532 nm and further intracavity frequency doubled by another KTP crystal,is designed and demonstrated.The coupled wave equations of the intracavity-frequency-doubled singly resonant optical parametric oscillator are established and the dynamic process is analyzed based on the numerical simulation results.2.37 W yellow output at 575.6 nm is obtained under 21.1 W green pump power with the pulse repetition frequency（PRF）of 10 k Hz.The corresponding conversion efficiency is 11.2%.The spectral linewidth and pulse duration are 0.5 nm and 32.1 ns,respectively.The beam quality factor M² is2.98 and 3.18 on x and y directions,respectively,and the wavelength tuning range is573-578 nm.3.A high-power intracavity Raman laser with side-pumped Nd:YAG fundamental laser and YVO₄ Raman crystal which intracavity frequency-doubled by KTP crystal to produce yellow output at 588 nm is designed and demonstrated.The in-band pumping scheme at 885 nm is adopted to release the thermal effect in the Nd:YAG crystal and a Z-shaped laser cavity is used to compensate the thermal lensing further.13.7 W average yellow output power at 588 nm is obtained under 233.0 W diode pump with the PRF of 10 k Hz.The spectral linewidth of the yellow output is～0.05 nm and the pulse duration is 12.5 ns.4.A Nd:YVO₄ self-Raman laser which intracavity frequency-doubled by LBO crystal to produce yellow output at 588 nm is designed and demonstrated.To release the thermal effect,the in-band pump at 878.6 nm and quasi-continuous-wave（QCW）pumping are adopted,hence improving the power performance.2.85 W CW yellow output and 7.6 W acousto-optical（AQ）Q-switched pulsed output at a PRF of 90 k Hz are obtained,respectively,under incident QCW pump power of 32 W.The corresponding conversion efficiencies are 8.9%and 23.8%,respectively,both of which are improved a lot compared with CW pumping scheme.更多还原