Measuring Thermal Diffusivity of Optical Elements by Surface Thermal Lens Method

Chenlu Hu; Dawei Li; Xiaofeng Liu; Xiaoling Li; Yuanan Zhao; Jianda Shao

doi:10.3788/CJL202249.2103101

Chinese Journal of Lasers, Volume. 49, Issue 21, 2103101(2022)

Measuring Thermal Diffusivity of Optical Elements by Surface Thermal Lens Method

Chenlu Hu^1,2,3, Dawei Li^1,2、*, Xiaofeng Liu^1,2, Xiaoling Li^1,2, Yuanan Zhao^1,2,3, and Jianda Shao^1,2,4

¹Laboratory of Thin Film Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

²Key Laboratory of Materials for High Power Laser, Chinese Academy of Sciences, Shanghai 201800, China

³Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

⁴Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, Zhejiang, China

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Figures & Tables(8)

Fig. 1. Surface thermal lens effect. (a) Schematic; (b) thermal bulge on sample surface

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Fig. 2. Schematics of STL technology for measuring thermal diffusivity. (a) Diagram of thermal bulge; thermal bulge heights at (b) x_1, (c) x_2,and (d) x₃ versus time

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Fig. 3. Schematic of measuring thermal diffusivity by STL technology

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Fig. 4. Schematic of thermal diffusivity measuring device

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Fig. 5. Measurement results by STL method. (a) Phase versus r; (b) enlarged view of dotted box area in Fig. 5(a)

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Fig. 6. Measurement results by PDS

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Table 1. Calculated m_A
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Table 1. Calculated m_A
Damage point No. Δx /mm d₀ /μm m_A ${\bar{m}}_{A}$
1 1.34 118 11.36 11.8
2 1.41 116 12.16
3 1.45 121 11.98
4 1.35 115 11.74

Table 2. Measured thermal diffusivities of films
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Table 2. Measured thermal diffusivities of films
Sample STL PDS
Chromium film 36.9 37.2
Carbon film 45.1 47.5
High reflection film 14.7 17.1
Antireflective film 12.7 13.3

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Chenlu Hu, Dawei Li, Xiaofeng Liu, Xiaoling Li, Yuanan Zhao, Jianda Shao. Measuring Thermal Diffusivity of Optical Elements by Surface Thermal Lens Method[J]. Chinese Journal of Lasers, 2022, 49(21): 2103101

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