背景吸收系数对掺杂Yb3+ 固体材料激光冷却特性的影响

doi:10.3969/j.issn.1000-5641.2025.03.014

华东师范大学学报（自然科学版） ›› 2025, Vol. 2025 ›› Issue (3): 116-123.doi: 10.3969/j.issn.1000-5641.2025.03.014

• 物理学与电子学 • 上一篇

背景吸收系数对掺杂Yb³⁺固体材料激光冷却特性的影响

徐家金¹, 钟标¹^,*(), 雷永清¹^,², 潘宸乐³, 张佳宜¹, 张子恒¹, 王朝玉¹, 印建平¹^,*()

1. 华东师范大学精密光谱科学与技术国家重点实验室, 上海　200241
2. 山西工程科技职业大学基础课教学部, 山西晋中　030619
3. CWA世华学校, 江苏常熟　215500

收稿日期:2024-04-28 出版日期:2025-05-25 发布日期:2025-05-28
通讯作者: 钟标,印建平 E-mail:bzhong@lps.ecnu.edu.cn;jpyin@phy.ecnu.edu.cn
基金资助:
国家自然科学基金(11604100, 11834003, 61574056, 91536218, 11874151); 中国博士后自然科学基金特别资助项目(2016T90346)

Effect of background absorption on laser cooling characteristics of Yb³⁺-doped solids

Jiajin XU¹, Biao ZHONG¹^,*(), Yongqing LEI¹^,², Chenle PAN³, Jiayi ZHANG¹, Ziheng ZHANG¹, Chaoyu WANG¹, Jianping YIN¹^,*()

1. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai　200241, China
2. Basic Course Teaching Department, Shanxi Vocational University of Engineering and Technology, Jinzhong , Shanxi　030619, China
3. CWA School, Changshu, Jiangsu　215500, China

Received:2024-04-28 Online:2025-05-25 Published:2025-05-28
Contact: Biao ZHONG, Jianping YIN E-mail:bzhong@lps.ecnu.edu.cn;jpyin@phy.ecnu.edu.cn

摘要/Abstract

摘要：

根据掺杂稀土离子固体材料激光冷却四能级理论模型, 冷却样品的背景吸收系数是影响样品激光冷却性能的关键参数. 为了探究冷却样品(以Yb³⁺:LuLiF₄(LLF)为例) 中背景吸收系数与温度的函数关系, 设计了在低温条件下获取冷却晶体背景吸收系数的低温-激光诱导温度调制光谱(laser-induced temperature modulation spectrum, LITMoS)实验方案. 依据热负载理论推导了低温条件下冷却效率的实验计算公式, 并对热负载来源进行理论分析. 分析结果表明, 接触传导热负载是低温-LITMoS实验样品热负载的主要来源. 实验方案中采用液氮低温恒温器和特殊设计的冷指结构去控制晶体的温度, 利用时间阀门-差分荧光光谱测温法对晶体进行非接触式测温获得晶体的温降, 并对实验设计方案进行了可行性分析, 计算了对应波长下的样品冷却效率. 结果表明, 在低温条件下实验设计方案可以测量样品背景吸收系数与温度之间的函数关系, 制冷效率的测试结果符合光学制冷理论模型的预测.

关键词: 四能级理论, 背景吸收系数, 冷却效率, 低温-激光诱导温度调制光谱实验, 热负载

Abstract:

According to the four-energy level theoretical model, the background absorption of a cooled sample is a key parameter affecting laser cooling performance. To investigate the relationship between background absorption coefficient and the temperature of the cooled sample, such as Yb³⁺:LuLiF₄(LLF), a low-temperature laser-induced temperature modulation spectrum(LITMoS) experiment was designed to obtain the background absorption coefficient of the crystal at low temperatures. Based on the heat load theory, the experimental formula for the cooling efficiency under low-temperature conditions was derived, and the source of heat load was theoretically analyzed, demonstrating that contact conduction is the main source of heat load for low-temperature LITMoS experimental samples. In the experiments, a liquid nitrogen cryostat and a specially designed cold finger structure were used to control the temperature of the crystal, thereby obtaining the temperature drop of the crystal by non-contact temperature measurement using time-valve-differential fluorescence spectroscopy thermometry. A feasibility analysis was conducted on the experimental design scheme, and the sample cooling efficiency at the corresponding wavelength was calculated. The results show that the experimental design scheme can measure the functional relationship between the background absorption coefficient and temperature under low-temperature conditions. The test results of refrigeration efficiency were in accordance with the prediction of the theoretical model of optical refrigeration.

Key words: four-level theory, background absorption coefficient, cooling efficiency, low-temperature LITMoS(laser-induced temperature modulation spectrum) experiment, thermal load

中图分类号:

O437.3

徐家金, 钟标, 雷永清, 潘宸乐, 张佳宜, 张子恒, 王朝玉, 印建平. 背景吸收系数对掺杂Yb³⁺固体材料激光冷却特性的影响[J]. 华东师范大学学报（自然科学版）, 2025, 2025(3): 116-123.

Jiajin XU, Biao ZHONG, Yongqing LEI, Chenle PAN, Jiayi ZHANG, Ziheng ZHANG, Chaoyu WANG, Jianping YIN. Effect of background absorption on laser cooling characteristics of Yb³⁺-doped solids[J]. J* E* C* N* U* N* S*, 2025, 2025(3): 116-123.

图/表 4

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背景吸收系数对掺杂Yb³⁺固体材料激光冷却特性的影响

Effect of background absorption on laser cooling characteristics of Yb³⁺-doped solids

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