Optimization of an intracavity Q-switched solid-state second order Raman laser

In the past few decades, the multifunctional optical crystals for all-solid-state Raman lasers have been widely studied by many scholars due to their compactness, convenience and excellent performance. In this review, we briefly show two kinds of multifunctional Raman crystals: self-Raman (laser and Raman effects) crystals and self-frequency-doubled Raman (frequency-doubling and Raman effects) crystals. We firstly introduce the properties of the self-Raman laser crystals, including vanadate, tungstate, molybdate and silicate doped with rare earth ions, as well as self-frequency-doubled Raman crystals, including KTiOAsO4 (KTA) and BaTeMo2O9 (BTM). Additionally, the domestic and international progress in research on multifunctional Raman crystals is summarized in the continuous wave, passively Q-switched, actively Q-switched and mode-locked regimes. Finally, we present the bottleneck in multifunctional Raman crystals and the outlook for future development. Through this review, we contribute to a general understanding of multifunctional Raman crystals.

Download Full-text

Evaluation of 100G DP-QPSK long-haul transmission performance using second order co-pumped Raman laser based amplification

Optics Express ◽

10.1364/oe.23.022181 ◽

2015 ◽

Vol 23 (17) ◽

pp. 22181 ◽

Cited By ~ 38

Author(s):

Mingming Tan ◽

Paweł Rosa ◽

Son Thai Le ◽

Ian. D. Phillips ◽

Paul Harper

Keyword(s):

Raman Laser ◽

Second Order ◽

Transmission Performance

Download Full-text

Reduced Polarisation-Dependent Gain RIN in Second-Order Ultralong Raman Laser Amplification

2018 European Conference on Optical Communication (ECOC) ◽

10.1109/ecoc.2018.8535216 ◽

2018 ◽

Author(s):

Giuseppe Rizzelli ◽

Pedro Corredera-Guillen ◽

Juan Diego Ania-Castanon

Keyword(s):

Raman Laser ◽

Second Order ◽

Laser Amplification

Download Full-text

Origin of the residual line width under frequency-switched Lee–Goldburg decoupling in MAS solid-state NMR

Magnetic Resonance ◽

10.5194/mr-1-13-2020 ◽

2020 ◽

Vol 1 (1) ◽

pp. 13-25 ◽

Cited By ~ 1

Author(s):

Johannes Hellwagner ◽

Liam Grunwald ◽

Manuel Ochsner ◽

Daniel Zindel ◽

Beat H. Meier ◽

...

Keyword(s):

Solid State ◽

Line Width ◽

Floquet Theory ◽

Pulse Sequence ◽

Second Order ◽

Magic Angle ◽

Line Broadening ◽

Third Order ◽

Order Error ◽

Error Terms

Abstract. Homonuclear decoupling sequences in solid-state nuclear magnetic resonance (NMR) under magic-angle spinning (MAS) show experimentally significantly larger residual line width than expected from Floquet theory to second order. We present an in-depth theoretical and experimental analysis of the origin of the residual line width under decoupling based on frequency-switched Lee–Goldburg (FSLG) sequences. We analyze the effect of experimental pulse-shape errors (e.g., pulse transients and B1-field inhomogeneities) and use a Floquet-theory-based description of higher-order error terms that arise from the interference between the MAS rotation and the pulse sequence. It is shown that the magnitude of the third-order auto term of a single homo- or heteronuclear coupled spin pair is important and leads to significant line broadening under FSLG decoupling. Furthermore, we show the dependence of these third-order error terms on the angle of the effective field with the B0 field. An analysis of second-order cross terms is presented that shows that the influence of three-spin terms is small since they are averaged by the pulse sequence. The importance of the inhomogeneity of the radio-frequency (rf) field is discussed and shown to be the main source of residual line broadening while pulse transients do not seem to play an important role. Experimentally, the influence of the combination of these error terms is shown by using restricted samples and pulse-transient compensation. The results show that all terms are additive but the major contribution to the residual line width comes from the rf-field inhomogeneity for the standard implementation of FSLG sequences, which is significant even for samples with a restricted volume.

Download Full-text