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Study on the near-field non-linearity (SMILE) of high power diode laser arrays
Zhang, Hongyou1,2; Jia, Yangtao3; Li, Changxuan3; Zah, Chung-En3; Liu, Xingsheng2,3; Zhang, Hongyou (zhanghy01@focuslight.com)
Conference NameComponents and Packaging for Laser Systems IV 2018
Source PublicationComponents and Packaging for Laser Systems IV
Conference Date2018-01-30
Conference PlaceSan Francisco, CA, United states
Contribution Rank1

High power laser diodes have been found a wide range of industrial, space, medical applications, characterized by high conversion efficiency, small size, light weight and a long lifetime. However, due to thermal induced stress, each emitter in a semiconductor laser bar or array is displaced along p-n junction, resulting of each emitter is not in a line, called Near-field Non-linearity. Near-field Non-linearity along laser bar (also known as "SMILE") determines the outcome of optical coupling and beam shaping [1]. The SMILE of a laser array is the main obstacle to obtain good optical coupling efficiency and beam shaping from a laser array. Larger SMILE value causes a larger divergence angle and a wider line after collimation and focusing, respectively. In this letter, we simulate two different package structures based on MCC (Micro Channel Cooler) with Indium and AuSn solders, including the distribution of normal stress and the SMILE value. According to the theoretical results, we found the distribution of normal stress on laser bar shows the largest in the middle and drops rapidly near both ends. At last, we did another experiment to prove that the SMILE value of a laser bar was mainly affected by the die bonding process, rather than the operating condition. © 2018 SPIE.

Indexed ByEI
EI Accession Number20181505007522
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Document Type会议论文
Corresponding AuthorZhang, Hongyou (zhanghy01@focuslight.com)
Affiliation1.State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, Shanxi; 710077, China
2.University of Chinese, Academy of Sciences, Beijing; 100049, China
3.Focuslight Technologies Inc., Xi'an, Shanxi; 710077, China
Recommended Citation
GB/T 7714
Zhang, Hongyou,Jia, Yangtao,Li, Changxuan,et al. Study on the near-field non-linearity (SMILE) of high power diode laser arrays[C]:SPIE,2018.
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