Work

Fabrication of Highly Transparent Co:MgAl2O4Ceramic Saturable Absorber for Passive Q-switching in 1.5μm

Year: 2021

Type: article

Abstract: The cobalt doped magnesium aluminum spinel is an efficient material for the passive Q-switching solid state lasers operating at the near infrared region.In order to prepare Co:MgAl 2 O 4 transparent ceramics with high absorption cross section and high in-line transmittance, the cobalt doped magnesium aluminum spinel nanopowders with pure phase were synthesized via the co-precipitation method.And after vacuum sintering and hot isostatic pressing (HIP), highly transparent 0.05at% Co:MgAl 2 O 4 ceramics were obtained.The influences of pre-sintering temperature on morphology and optical property of the Co:MgAl 2 O 4 ceramics were studied.With the pre-sintering temperature increasing from 1500-1650 ℃, the relative density increased from 95.2% to 98.5%, while the relative density decreased to 97.7% with the pre-sintering temperature increasing to 1700 ℃.Because of the relative low density, the Co:MgAl 2 O 4 ceramics were all opaque after vacuum pre-sintering.In the sintering temperature range of 1500-1700 ℃, the average grain size increased from 2.3 to 11.3 μm.After HIP post-treatment, the Co:MgAl 2 O 4 ceramics pre-sintered from 1550 to 1700 ℃ were all transparent, the Co:MgAl 2 O 4 ceramics pre-sintered at 1650 ℃ for 5 h and HIP post-treated at 1800 ℃ for 3 h showed the best optical quality, which were 81.4% at 400 nm and 85.9% at 900 nm, and the average grain size was 16.8 μm.The broad absorption bands in the wavelength range of 500-700 nm and 1200-1600 nm indicated that Co 2+ had incorporated into the spinel lattice.Moreover, the ground state absorption cross section of the best specimen is calculated with a value of 6.18×10 -19 cm 2 at 1540 nm, meaning that it's a promising candidate for passive Q-switching in solid-state lasers.

Source: Journal of Inorganic Materials

DOI: 10.15541/jim20200679

Authors: JING Yanqiu, LIU Qiang, SU Sha, LI Xiaoying, LIU Ziyu, LI Jiang

Institutions: Jiangsu University, Chinese Academy of Sciences, Shanghai Institute of Ceramics, University of Chinese Academy of Sciences

Language: English

Topic: Solid State Laser Technologies

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: diamond

Funder: Chinese Academy of Sciences

Award: G2273464793