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}  } 
引言
LIDAR是Light Detection And Ranging的缩写， 它通常是通过向目标照射一束脉冲激光来测了目标的距离等参数。LIDAR（光探测和测距）技术在无人驾驶、遥感测绘、国防安全等领域发挥着重要作用。测距仪作为LIDAR系统的关键部件，要求激光器具备高效、稳定的输出特性。Er,Yb:glass + Co:spinel 键合晶体因其优异的光学性能，成为LIDAR和测距仪中人眼安全激光源的理想选择。
1. Er,Yb:glass 增益介质和Co:spinel被动调Q特性
Er,Yb:glass（Er³⁺/Yb³⁺共掺磷酸盐或硅酸盐玻璃）是一种高效的1.5 μm人眼安全激光增益介质，具有以下优势：
- 高效能量转换：Yb³⁺在940 nm具有高吸收截面，并通过高效能量转移（>90%）激发Er³⁺，最终实现1535 nm激光输出。
- 高光-光转换效率：可达~35%，优于传统Er:glass。
- 优异的热稳定性：上能级寿命长（8–10 ms），适用于高能量脉冲输出。高热导率（1.2–1.5 W/m·K）降低热应力，提高光束质量。
- 宽光谱增益：增益带宽达60 nm（1500–1560 nm），支持可调谐输出，如1535 nm（LIDAR）和1550 nm（光通信）。
- 高抗损伤性：损伤阈值达15 J/cm²，耐受高功率泵浦，适用于恶劣环境。
Co:spinel 作为可饱和吸收体（SA），用于被动调Q运作，能够产生高峰值功率的短脉冲输出，使LIDAR系统能够实现远距离、高分辨率测量。
2. LIDAR系统中的关键应用
Er,Yb:glass + Co:spinel键合晶体在LIDAR和测距仪中的主要应用包括：
- 无人驾驶激光雷达：1535 nm激光器提供高峰值功率，提升探测范围和目标识别能力，同时减少环境光干扰。
- 国防与军事测距：人眼安全波长确保士兵操作安全，适用于战场目标定位、弹道测量等远距离测距任务。
- 地理测绘与环境监测：1535 nm激光能穿透大气中的烟雾和粉尘，提高LIDAR测绘精度，适用于城市建模、森林资源调查等领域。
- 大气监测与科学研究：该波长的高穿透性适用于气象探测，如测量水汽分布、大气污染物浓度等。
3. 1535 nm激光在人眼安全测距中的优势
LIDAR系统通常工作在近红外波段，而1535 nm波长被认为是人眼安全波长，符合IEC 60825标准。其安全性主要体现在：
- 生物安全性：1535 nm激光主要被角膜与晶状体吸收，显著降低视网膜损伤风险（相较于1064 nm等短波长激光）。
- 大气传输特性：在雾、雨等复杂环境中具有较高的透射率，且与熔融石英光纤（传输损耗<0.2 dB/km）兼容。
- 探测器兼容性：与InGaAs光电二极管（室温响应范围900–1700 nm）高效匹配，提升系统信噪比。
4. 镀膜技术优化LIDAR性能
为了提高LIDAR系统的效率和稳定性，Er,Yb:glass + Co:spinel 键合晶体通常采用以下镀膜技术：
- 增透膜（AR@1535nm）：减少激光在晶体界面的损耗，提高透射效率。
- 高反射膜（HR@1535nm + AR@940nm）：增强腔内光循环，同时优化泵浦光吸收。
- 部分反射膜（PR@1535nm）：优化输出耦合，提高系统的能量利用率。
通过精确控制薄膜层的厚度和折射率，镀膜技术能够有效降低光损耗，提高反射或透射性能。高质量的增透膜减少腔内光的反射损失，提高泵浦光利用率。高反射膜确保腔内光能量有效循环，增强激光器的输出稳定性，而部分反射膜则可优化激光输出功率，提高LIDAR系统的探测能力。
5. 未来展望
随着LIDAR技术的发展，对激光器的性能要求不断提升。未来，Er,Yb:glass + Co:spinel 键合晶体的优化方向可能包括：
- 提升泵浦效率：采用更高效的Yb³⁺能量传递机制，提高整体转换效率。
- 优化热管理：开发更先进的散热结构，减少热透镜效应对光束质量的影响。
- 精确镀膜控制：通过纳米级薄膜技术，进一步降低光损耗，提高激光输出稳定性。
6. 结论
Er,Yb:glass + Co:spinel 键合晶体凭借其优异的光学特性，在LIDAR和测距仪中发挥着至关重要的作用。其在1535 nm人眼安全波长下的高效激光输出、高峰值功率脉冲特性以及稳定的光学性能，使其成为先进测距和遥感系统的理想选择。此外，该材料在恶劣环境下的可靠性使其适用于军事、航空航天和精密测量等多个领域。
未来，随着镀膜技术、热管理和材料工程的进一步优化，Er,Yb:glass + Co:spinel 键合晶体的应用范围将进一步扩大。新型材料的研究和制造工艺的改进将推动更高效、更稳定的激光器开发，满足不断增长的高精度测距与探测需求。
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