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Sub-100-fs bulk solid-state lasers near 2-micron
Author(s): Valentin Petrov; Yicheng Wang; Weidong Chen; Zhongben Pan; Yongguang Zhao; Li Wang; Mark Mero; Sun Young Choi; Fabian Rotermund; Won Bae Cho; Wei Jing; Hui Huang; Hualei Yuan; Huaqiang Cai; Lizhen Zhang; Zhoubin Lin; Pavel Loiko; Xavier Mateos; Xiaodong Xu; Jun Xu; Haohai Yu; Huaijin Zhang; Soile Suomalainen; Mircea Guina; Antti Härkönen; Uwe Griebner
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Paper Abstract

Mode-locked lasers emitting ultrashort pulses in the 2-μm spectral range at high (100-MHz) repetition rates offer unique opportunities for time-resolved molecular spectroscopy and are interesting as pump/seed sources for parametric frequency down-conversion and as seeders of ultrafast regenerative laser amplifiers. Passively mode-locked lasers based on Tm3+- and Ho3+-doped bulk solid-state materials have been under development for about a decade. In 2009 we demonstrated the first steady-state operation of such a Tm:KLu(WO4)2 laser using a single-walled carbon nanotube (SWCNT) saturable absorber (SA), generating 10-ps pulses at 1.95 μm. In 2012 this laser produced 141-fs pulses at 2.037 μm. More recently, the study of numerous active media with different SAs resulted in the generation of sub-100-fs (sub-10-optical-cycle) pulses. Materials with broad and smooth spectral gain profile were selected, naturally emitting above 2 μm to avoid water vapor absorption/dispersion effects, including anisotropic materials, strong crystal-field distortion in hosts that do not contain rare-earths, crystals with structural or compositional (i.e. mixed compounds) disorder that exhibit inhomogeneous line broadening, mixed laser ceramics, and Tm,Ho-codoping of ordered and disordered crystals and ceramics. A broad absorption band in semiconducting SWCNTs spans from 1.6 to 2.1-μm whereas the absorption of graphene extends into the mid-IR and scales for multilayers, increasing the modulation depth. Compared to GaSb-based semiconductor SA mirrors (SESAMs), the carbon nanostructures exhibit broader spectral response and can be fabricated by simpler and inexpensive techniques. Chirped mirrors were implemented for groupvelocity dispersion compensation, to generate the shortest pulses, down to 52 fs at 2.015 μm.

Paper Details

Date Published: 20 December 2019
PDF: 16 pages
Proc. SPIE 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 112094G (20 December 2019); doi: 10.1117/12.2549618
Show Author Affiliations
Valentin Petrov, Max Born Institute (Germany)
Yicheng Wang, Max Born Institute (Germany)
Ruhr Univ. (Germany)
Weidong Chen, Max Born Institute (Germany)
Fujian Institute of Research on the Structure of Matter (China)
Zhongben Pan, Max Born Institute (Germany)
China Academy of Engineering Physics (China)
Yongguang Zhao, Max Born Institute (Germany)
Jiangsu Normal Univ. (China)
Li Wang, Max Born Institute (Germany)
Hefei Institutes of Physical Science, CAS (China)
Mark Mero, Max Born Institute (Germany)
Sun Young Choi, KAIST (Korea, Republic of)
Fabian Rotermund, KAIST (Korea, Republic of)
Won Bae Cho, ETRI (Korea, Republic of)
Wei Jing, China Academy of Engineering Physics (China)
Hui Huang, China Academy of Engineering Physics (China)
Hualei Yuan, China Academy of Engineering Physics (China)
Huaqiang Cai, China Academy of Engineering Physics (China)
Lizhen Zhang, Fujian Institute of Research on the Structure of Matter (China)
Zhoubin Lin, Fujian Institute of Research on the Structure of Matter (China)
Pavel Loiko, ITMO Univ. (Russian Federation)
Xavier Mateos, Univ. Rovira i Virgili (Spain)
Xiaodong Xu, Jiangsu Normal Univ. (China)
Jun Xu, Tongji Univ. (China)
Haohai Yu, Shandong Univ. (China)
Huaijin Zhang, Shandong Univ. (China)
Soile Suomalainen, Tampere Univ. of Technology (Finland)
Mircea Guina, Tampere Univ. of Technology (Finland)
Antti Härkönen, Tampere Univ. of Technology (Finland)
Uwe Griebner, Max Born Institute (Germany)


Published in SPIE Proceedings Vol. 11209:
Eleventh International Conference on Information Optics and Photonics (CIOP 2019)
Hannan Wang, Editor(s)

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