Void-free bonding for a large slab laser crystal

Autor: Jian Xu, Zuyan Xu, Baoshan Wang, Yan-Yong Lin, Chen Zhongzheng, Jialin Xu, Yong Bo, Ya-Ding Guo, Yiting Xu, Lei Yuan, Jun-Wei Zuo, Qinjun Peng, Hongwei Gao
Rok vydání: 2020
Předmět:
Zdroj: Applied Optics. 59:459
ISSN: 2155-3165
1559-128X
DOI: 10.1364/ao.59.000459
Popis: A void-free bonding technique was demonstrated for a large slab Nd: YAG crystal with a bonding surface dimension of ∼ 160 m m × 70 m m . By using the novel fluxless oxide layer removal technology, the indium-oxide barrier problem was resolved. With the help of electrochemical-polished indium solder and a plasma-cleaned heat sink, the solderability of the indium was enhanced; in particular, the contact angle of the solder was improved from 51° to 31°. With the largest-bonding-size slab, a single-slab laser created a maximum output power of 7.3 kW under an absorbed pump power of 12.8 kW, corresponding to an optical to optical efficiency of 57% and a slope conversion of 67.8%. By detecting the wavefront of the interferometer before and after bonding, the RMS of wavefront was 0.192 λ and 0.434 λ ( λ = 633 n m ), respectively. To the best of our knowledge, this is the largest void-free bonding size for a laser slab and the highest output power achieved from a single-slab crystal laser oscillator.
Databáze: OpenAIRE