Full Text:   <2008>

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CLC number: TN248.1

On-line Access: 2015-04-03

Received: 2015-02-15

Revision Accepted: 2015-03-09

Crosschecked: 2015-03-25

Cited: 2

Clicked: 2952

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Sha Wang

http://orcid.org/0000-0002-7038-1828

Guo-ying Feng

http://orcid.org/0000-0002-4533-1423

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Journal of Zhejiang University SCIENCE A 2015 Vol.16 No.4 P.326-334

http://doi.org/10.1631/jzus.A1500030


SESAM fabrication errors and its influence on ultrafast laser cavity design


Author(s):  Sha Wang, Guo-ying Feng, Shou-huan Zhou

Affiliation(s):  Institute of Laser & Micro/Nano Engineering, College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China; more

Corresponding email(s):   guoingfeng@scu.edu.cn, zhoush@scu.edu.cn

Key Words:  Semiconductor saturable absorber mirror (SESAM), Ultrafast laser, Fabrication error, Design criteria


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Sha Wang, Guo-ying Feng, Shou-huan Zhou. SESAM fabrication errors and its influence on ultrafast laser cavity design[J]. Journal of Zhejiang University Science A, 2015, 16(4): 326-334.

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Abstract: 
During mode-locked ultrafast laser experiments, we find that semiconductor saturable absorber mirrors (SESAMs) from the same manufacturing process may, from batch to batch, show different working ranges: pure Q-switching, Q-switched mode-locking, and continuous wave (CW) mode-locking. This is because, in high-volume wafer-scale fabrication, there is typically an estimated 1% error for high-quality molecular beam epitaxy (MBE) growth, which introduces a variation in the parameters of an individual SESAM. In this paper, we will analyze how that 1% error in layer thickness influences the behaviour of SESAMs in three different structures: resonant SESAM, anti-resonant SESAM, and enhanced SESAM. Furthermore, the characteristics of the SESAM will affect the mode-locking dynamic behavior of ultrafast solid state lasers. In the worst case, a SESAM with a fabrication error may prevent the laser cavity from mode-locking. Proper laser cavity design can help to reduce the impact of SESAM fabrication errors on laser performance and maintain the laser in the CW mode-locking range.

SESAM was one of the most important attractive inventions and key component on generating ultrafast pulses, however people have been focusing on how to design, improve and optimize the SESAM to meet its application in both bulk crystals and fiber based mode-locking, few people work on the fabrication errors of SESAM that may affect the mode-locking falling into one of the categories: Q-Switching or Q-Switching mode-locking. Theoretically the authors simulate all parameters of three types of SESAM structures with thickness errors, and raise a criteria in cavity design to tolerate the manufacturing error impact.

可饱和吸收镜制造误差及其对飞秒激光器腔型设计的影响

目的:从可饱和吸收镜(SESAM)制造误差所引起其光学特性的改变出发,提出采用飞秒激光器腔型设计的方法,避免SESAM误差对激光输出性能造成的影响。
创新点:从激光器腔型设计方案出发,采用不同曲率镜,调整激光腔中激光晶体及可饱和吸收镜上的光斑半径大小比值,解决SESAM制造误差对激光器输出的影响。
方法:采用传递矩阵法计算SESAM半导体膜层厚度对其光学性能的影响。对于不同的SESAM设计,影响大小不同(表1)。
结论:通过改变腔内曲率镜M1M2M3的曲率值大小以及腔的长度值,可以减弱SESAM制造误差对飞秒激光器输出的影响,实现对所有SESAM的连续锁模。

关键词:可饱和吸收镜;飞秒激光器;制造误差;腔型设计

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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