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在电磁波谱中,介于微波与红外光之间的太赫兹波(Terahertz)曾长期被称为“太赫兹空白(THz Gap)”。它拥有独特的“分子指纹”识别能力,且能穿透陶瓷、塑料等非金属材料,在安检、生物医学、6G通信及材料无损检测等领域拥有巨大的应用潜力。

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    在电磁波谱中,介于微波与红外光之间的太赫兹波(Terahertz)曾长期被称为“太赫兹空白(THz Gap)”。它拥有独特的“分子指纹”识别能力,且能穿透陶瓷、塑料等非金属材料,在安检、生物医学、6G通信及材料无损检测等领域拥有巨大的应用潜力。

    . 室温无冷却直抵104 mW,刷新强场太赫兹源世界纪录. 科技导报, 2025 , 43 (23) : 6 -6 .
    . Science & Technology Review, 2025 , 43 (23) : 6 -6 .
    在电磁波谱中,介于微波与红外光之间的太赫兹波(Terahertz)曾长期被称为“太赫兹空白(THz Gap)”。它拥有独特的“分子指纹”识别能力,且能穿透陶瓷、塑料等非金属材料,在安检、生物医学、6G通信及材料无损检测等领域拥有巨大的应用潜力。
    然而,太赫兹技术的大规模普及一直面临一个核心痛点:源的功率太低。传统的太赫兹源平均功率通常仅在微瓦(μW)量级,这就像在漆黑的夜晚仅有一根微弱的蜡烛,导致检测速度慢、图像噪点多、系统昂贵且复杂。
    为了让这双“火眼金睛”看得更清、更远,科学家们一直致力于寻找高平均功率的强场太赫兹源,即为太赫兹装上一盏“超亮探照灯”。获得强太赫兹源通常有2种路径:一是使用高能量的钛宝石激光器,但其重复频率低,导致平均功率上不去;二是使用高重复频率的掺镱(Yb)激光器。北京航空航天大学吴晓君团队选择了第2条路径。
    为了在室温、无冷却的苛刻条件下实现突破,团队采用了国产工业级掺镱飞秒激光器作为泵浦源,并对核心的光学转换系统进行了精密的“手术”:选用具有高非线性系数的铌酸锂晶体,利用倾斜脉冲前沿技术(TPFP)实现能量的高效转换;系统性优化了泵浦光斑的大小(寻找能量密度与晶体损伤的平衡点)和激光脉冲的宽度(锁定在1 ps左右的最佳窗口)。结果显示,团队最终在100 kHz的高重复频率下,利用105 W的泵浦功率,实现了104 mW的太赫兹平均功率输出,转换效率约为0.1%,峰值电场强度达到421 kV/cm。
    (来源于中国科技期刊卓越行动计划入选期刊《Chinese Physics Letters》2025,42:120406)

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    2种不同金属材料的力学参数

    Family
    属数
    Number of
    genus
    种数
    Number of
    species
    占总种数比例
    Percentage of
    total species (%)

    Genus
    种数
    Number of
    species
    占总种数比例
    Percentage of total
    species (%)
    鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
    小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
    多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
    红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
    小菇属 Mycena 11 5.26
    光柄菇属 Pluteus 5 2.39
    红菇属 Russula 17 8.13
    栓菌属 Trametes 5 2.39
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