Experiment on Ablation Threshold of Single Crystal Diamond Produced by Femtosecond Laser Processing

Genyu Chen; Zhichao Zhu; Jiu Yin; Biao Xiong; Mengqi Jin

doi:10.3788/CJL201946.0402001

Chinese Journal of Lasers, Volume. 46, Issue 4, 0402001(2019)

Experiment on Ablation Threshold of Single Crystal Diamond Produced by Femtosecond Laser Processing

Genyu Chen^1,2、*, Zhichao Zhu^1,2, Jiu Yin^1,2, Biao Xiong^1,2, and Mengqi Jin^1,2

¹ State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, Hunan 410082, China

² Laser Research Institute, Hunan University, Changsha, Hunan 410082, China

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Figures & Tables(13)

Fig. 1. Energy density distribution diagram of Gauss beam

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Fig. 2. Diamond sample after inlaying

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Fig. 3. Schematic of experimental device

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Fig. 4. Morphology of single pulse ablation pits obtained at different laser powers

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Fig. 5. Relationship between ln Pavg and D2

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Fig. 6. Microscopic morphology of diamond ablated trough obtained at different effective pulse numbers and average laser powers. (a) N=31, Pavg=7.7 W; (b) N=31, Pavg=10.7 W; (c) N=31, Pavg=15 W; (d) N=124, Pavg=5.3 W; (e) N=124, Pavg=8.8 W; (f) N=124, Pavg=12.3 W; (g) N=486, Pavg=4.6 W; (h) N=486, Pavg=8.8 W; (i) N=486, Pavg=10.7 W; (j) N=972, Pavg=4.6 W; (k) N=972, Pavg=6.5 W; (l) N=972, Pavg=8.8 W

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Fig. 7. Relationship between B2 and ln Pavg obtained at different effective pulse numbers

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Fig. 8. Change of ablation threshold varying with effective pulse number

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Fig. 9. Ablation effect of diamond in different stages. (a) Weak ablation, N=31, Pavg=10.7 W; (b) strong ablation, N=972, Pavg=6.5 W

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Table 1. Physical properties of monocrystal diamond

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Table 1. Physical properties of monocrystal diamond

Property	Value
Thermal conductivity λ /(W·cm^-1·K^-1)	20
Density /(g·cm^-3)	3.515
Constant pressure specific heatcapacity /(J·g^-1·K^-1)	1.827
Thermal diffusivity α /(cm²·s^-1)	3.114
Melting point or decomposition point /℃	3700-4000
Refractive index	2.417
Absorption rate (laser with awavelength of 1064 nm)	0.25

Table 2. Average power and its logarithm used in experiment
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Table 2. Average power and its logarithm used in experiment
Number P_avg/W ln(P_avg/W) Number P_avg/W ln(P_avg/W)
0 11.1 2.41 8 20.7 3.03
1 12.3 2.51 9 22.3 3.10
2 13.4 2.60 10 23.4 3.15
3 15.0 2.71 11 25.0 3.22
4 16.1 2.78 12 26.5 3.28
5 17.3 2.85 13 28.1 3.34
6 18.0 2.89 14 29.4 3.38
7 20.0 3.00 15 30.8 3.43

Table 3. Experimental data
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Table 3. Experimental data
Number Effectivepulsenumber Laser scantimes Average laserpower /W
1 4 1 10,13.4,17.3
2 31 8 7.7,10.7,15.0
3 124 32 5.3,8.8,12.3
4 486 125 4.6,8.8,10.7
5 972 250 4.6,6.5,8.8
6 1943 500 3.8,5.7,7.7

Table 4. Ablation threshold of single crystal diamond obtained at different pulse numbers
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Table 4. Ablation threshold of single crystal diamond obtained at different pulse numbers
Number 1 2 3 4 5 6
Effectivepulsenumber 1 31 124 486 972 1943
Ablationthreshold /(J·cm^-2) 8.80 4.53 2.94 2.35 2.04 1.70

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Genyu Chen, Zhichao Zhu, Jiu Yin, Biao Xiong, Mengqi Jin. Experiment on Ablation Threshold of Single Crystal Diamond Produced by Femtosecond Laser Processing[J]. Chinese Journal of Lasers, 2019, 46(4): 0402001

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