Fabrication and Laser Parameters of Yb:YAG Transparent Ceramics with High Optical Quality

doi:10.15541/jim20190077

Journal of Inorganic Materials ›› 2020, Vol. 35 ›› Issue (2): 205-210.DOI: 10.15541/jim20190077

Special Issue: 功能陶瓷论文精选(二)

• RESEARCH PAPER • Previous Articles Next Articles

Fabrication and Laser Parameters of Yb:YAG Transparent Ceramics with High Optical Quality

WANG Qing-Qing^1,²,SHI Yun¹,FENG Ya-Gang^1,³,LIU Xin^1,³,CHEN Hao-Hong¹,XIE Teng-Fei¹,LI Jiang^1,³()

1. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China
2. Engineering Technology Research Center for New Silicon-based Materials, Faculty of Science, Bengbu University, Bengbu 233030, China
3. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Received:2019-02-14 Revised:2019-03-21 Published:2020-02-20 Online:2019-05-29
Supported by:
Domestic Visiting Program of Anhui Education Department(gxgnfx2018059);Natural Science Project of Bengbu University(2018ZR06zd);Natural Science Project of Anhui Education Department(KJ2018A0573);National Natural Science Foundation of China(61575212);Key Research Project of the Frontier Science of the Chinese Academy of Sciences(QYZDB-SSW-JSC022)

Abstract

Abstract:

Yb:YAG transparent ceramics with high optical quality were fabricated by solid-state reaction and vacuum sintering method (1750 ℃×30 h) using high-purity Y₂O₃, α-Al₂O₃and Yb₂O₃ powders as raw materials. The measured concentration of Yb ³⁺in 5.0at% Yb:YAG ceramics is 6.41×10 ²⁰ cm ^-3, and the cell density is 4.65 g/cm ³. The microstructures, spectral characteristics and laser performance parameters of Yb:YAG ceramics were studied in this work. FESEM results show that Yb:YAG ceramics have uniform and compact structure, clean and straight grain boundaries, and the average grain size is about (19±3) μm. The in-line transmittance of Yb:YAG ceramics with thickness of 4.0 mm reaches 82.5% at 400 nm and 85.2% at 1100 nm. The minimum pump saturation light intensity occurs at 940 nm, and the pump threshold power at 1030 nm is the lowest. The quality factor of 1030 nm laser pumped at 940 nm is 1.02×10 ^-22 cm·s. By calculating the gain cross section, it is indicated that Yb:YAG ceramics can be tuned broadband, and are ideal laser gain media.

Key words: Yb:YAG ceramics, reactive sintering, spectral properties, laser performance parameters

CLC Number:

TQ174

WANG Qing-Qing,SHI Yun,FENG Ya-Gang,LIU Xin,CHEN Hao-Hong,XIE Teng-Fei,LI Jiang. Fabrication and Laser Parameters of Yb:YAG Transparent Ceramics with High Optical Quality[J]. Journal of Inorganic Materials, 2020, 35(2): 205-210.

Figures/Tables 8

Fig. 1 FESEM microstructures of commercial oxide powders (a) α-Al2O3; (b) Y2O3; (c) Yb2O3

Fig. 2 FESEM microstructure of the thermally etched surface of Yb:YAG ceramics

Fig. 3 XRD pattern of Yb:YAG ceramics

Fig. 4 In-line transmittance curve of Yb:YAG ceramics

Fig. 5 Energy level structure of Yb3+ in YAG crystal

Fig. 6 Absorption and emission cross sections of Yb:YAG ceramics

Table 1 Laser performance parameters of Yb:YAG transparent ceramics at different pump wavelengths and laser wavelengths

$\lambda_{p}\to \lambda_{ex}/nm$	$I_{sat}/(kW·cm^{-2})$	$F_{ext}(\lambda_{ex})/(J·cm^{-2})$	$\beta_{min}/\%$	$I_{min}/(kW·cm^{-2})$	$M/(\times 10^{-23},cm·s)$
915→968	58.7	56.7	52.4	30.8	0.86
940→968	25.5	56.7	52.4	13.4	1.92
915→1030	58.7	10.1	5.63	3.30	4.53
940→1030	25.5	10.1	5.63	1.44	10.2
968→1030	44.8	10.1	5.63	2.52	5.62
915→1048	58.7	58.7	2.59	1.52	0.78
940→1048	25.5	58.7	2.59	0.66	1.72
968→1048	44.8	58.7	2.59	1.16	0.95

Fig. 7 Gain cross sections of Yb:YAG ceramics

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Fabrication and Laser Parameters of Yb:YAG Transparent Ceramics with High Optical Quality

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