scholarly journals Integrated Raman Laser: A Review of the Last Two Decades

Micromachines ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 330 ◽  
Author(s):  
Maria Antonietta Ferrara ◽  
Luigi Sirleto
Keyword(s):  
Silicon Nanocrystals ◽  
Stimulated Raman Scattering ◽  
Raman Laser ◽  
Laser Source ◽  
Raman Gain ◽  
Research Activity ◽  
Nonlinear Waveguide ◽  
Raman Lasers ◽  
Impressive Result ◽  
First Time

Important accomplishments concerning an integrated laser source based on stimulated Raman scattering (SRS) have been achieved in the last two decades in the fields of photonics, microphotonics and nanophotonics. In 2005, the first integrated silicon laser based upon SRS was realized in the nonlinear waveguide. This breakthrough promoted an intense research activity addressed to the realization of integrated Raman sources in photonics microstructures, like microcavities and photonics crystals. In 2012, a giant Raman gain in silicon nanocrystals was measured for the first time. Starting from this impressive result, some promising devices have recently been realized combining nanocrystals and microphotonics structures. Of course, the development of integrated Raman sources has been influenced by the trend of photonics towards the nano-world, which started from the nonlinear waveguide, going through microphotonics structures, and finally coming to nanophotonics. Therefore, in this review, the challenges, achievements and perspectives of an integrated laser source based on SRS in the last two decades are reviewed, side by side with the trend towards nanophotonics. The reported results point out promising perspectives for integrated micro- and/or nano-Raman lasers.

Toward an ideal nanomaterial for on-chip Raman laser

2017 ◽  
Vol 26 (03) ◽  
pp. 1750039 ◽  
Author(s):  
L. Sirleto ◽  
M. A. Ferrara ◽  
A. Vergara
Keyword(s):  
Stimulated Raman Scattering ◽  
Emission Spectra ◽  
General Rule ◽  
Raman Laser ◽  
Raman Gain ◽  
Bulk Materials ◽  
Si Nanocrystals ◽  
Laser Sources ◽  
On Chip ◽  
Fundamental Limitation

One of the most important applications of stimulated Raman scattering (SRS) is the realization of amplifiers or laser sources in bulk materials, in fiber and in integrated optic format as well. We note that, as a general rule, in all laser gain bulk materials, there is a tradeoff between gain and bandwidth: line width may be increased at the expense of peak gain. This tradeoff is a fundamental limitation toward the realization of micro/nano-sources with large emission spectra. In this paper, in order to clarify the possibility of obtaining new materials with both large Raman gain coefficients and spectral bandwidth, SRS investigations in nanostructures, spanning from nanometrically heterogeneous K2O–Nb2O5SiO2 (KNS) glasses to Si nanocrystals, are reported and discussed.

scholarly journals Fiber Raman Amplifiers and Fiber Raman Lasers

Micromachines ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1044
Author(s):  
Luigi Sirleto
Keyword(s):  
Raman Scattering ◽  
Nonlinear Optical ◽  
Stimulated Raman Scattering ◽  
Optical Effect ◽  
Nonlinear Optical Effect ◽  
Raman Lasers ◽  
Raman Amplifiers ◽  
First Time ◽  
Stimulated Raman

Stimulated Raman scattering (SRS) is a nonlinear optical effect, observed for the first time in 1962, which lies at the heart of fiber Raman amplifiers and fiber Raman lasers [...]

Non-Plasmonic SERS with Silicon: Is It Really Safe? New Insights into Opto-Thermics of Core/Shell Microbeads

2018 ◽  
Author(s):  
Nicolò Bontempi ◽  
Irene Vassalini ◽  
Stefano Danesi ◽  
Matteo Ferroni ◽  
Paolo Colombi ◽  
...  
Keyword(s):  
Critical Role ◽  
Raman Laser ◽  
Core Shell ◽  
Thermal Coupling ◽  
Melting Points ◽  
Experimental Proof ◽  
Weakly Coupled ◽  
Light Management ◽  
Laser Sources ◽  
First Time

<p>Here we investigate for the first time the opto-thermal behavior of SiO<sub>2</sub>/Si core/shell microbeads (Si-rex) irradiated with three common Raman laser sources (lambda=532, 633, 785 nm) under real working conditions. We obtained an experimental proof of the critical role played by bead size and aggregation in heat and light management, demonstrating that in the case of strong opto-thermal coupling the temperature can exceed that of the melting points of both core and shell components. In addition, we also show that weakly coupled beads can be utilized as stable substrates for plasmon-free SERS experiments.</p>

scholarly journals Multifunctional Optical Crystals for All-Solid-State Raman Lasers

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 114
Author(s):  
Hui Zhao ◽  
Shibo Dai ◽  
Siqi Zhu ◽  
Hao Yin ◽  
Zhen Li ◽  
...  
Keyword(s):  
Solid State ◽  
Continuous Wave ◽  
Frequency Doubling ◽  
Raman Laser ◽  
Rare Earth Ions ◽  
Excellent Performance ◽  
The Past ◽  
Raman Lasers ◽  
Optical Crystals ◽  
Laser Crystals

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.

Innovation in Slovenian tourism organisations

2015 ◽  
Vol 21 (1) ◽  
pp. 51-62
Author(s):  
Maja Uran Maravić ◽  
Dejan Križaj ◽  
Miha Lesjak
Keyword(s):  
Design Methodology ◽  
Mean Value ◽  
Sample Survey ◽  
Research Activity ◽  
Main Hypothesis ◽  
Innovation Activities ◽  
Innovation Climate ◽  
High Level ◽  
Innovation Practices ◽  
First Time

The purpose – Slovenian tourism organisations must constantly focus on developing variety innovations for organisations. In this paper, we present a study conducted on innovation practices in Slovenian tourism organisations. Design/methodology – In a survey conducted on Slovenia tourism organisations, we obtained data and identified their innovation performance and the innovation climate in their area of business. There are three main hypothesis tested. Findings – The research sample of 41 organisations found that most innovation in tourism organisations came through the introduction of new services (90%), followed by innovation through new organisational methods (73%), and found a high-level climate for innovation. Worse was its assessment of research activity within organisations and cooperation with external institutions (eg. universities and research institutes) and investment in innovation activities within their research and development. Results obtained from the research showed a mean value for the innovation climate-instrument of 3.83 indicating a high innovation climate for the Slovenian tourism companies included in the sample survey. Mostly, (publicly known as) more innovative active organisations responded to our survey. From such results, we find that tourism organisations included in the survey are aware of the importance of innovation, teaching organisations to communicate well and network with other organisations, are adaptable to change and engaged with their own ideas in support of the organisation's management. Originality of the research – The contribution of the research is that it has applied the generic instrument for measuring innovation climate on tourism and the first time climate is measured in Slovenia.

scholarly journals Stimulated Raman Microscopy Implemented by Three Femtosecond Laser Sources

2021 ◽  
Vol 255 ◽  
pp. 06003
Author(s):  
Rajeev Ranjan ◽  
Maria Antonietta Ferrara ◽  
Luigi Sirleto
Keyword(s):  
Femtosecond Laser ◽  
Stimulated Raman Scattering ◽  
Second Harmonic ◽  
Laser Beams ◽  
Raman Gain ◽  
Harmonic Generator ◽  
Second Harmonic Generator ◽  
Laser Sources ◽  
Fingerprint Region ◽  
Stimulated Raman

In this work, the implementation of a femtosecond Stimulated Raman Scattering microscope, equipped with three femtosecond laser sources: a Titanium-Sapphire (Ti:Sa), an optical parametric oscillator (OPO), and a second harmonic generator (SHG); is presented. Our microscope is designed so that it can cover all the regions of Raman spectra, taking advantage of two possible laser combinations. The first, Ti:Sa and OPO laser beams, which cover the C-H region (>2800 cm-1 ) in stimulated Raman gain (SRG) modality, whereas the second, Ti:Sa and SHG laser beams, covering the C-H region and the fingerprint region in stimulated Raman losses (SRL) modality. The successful realization of the microscope is demonstrated, reporting images of polystyrene beads using both SRL and SRG modalities.

Continuous-Wave 1.7 μm All-Fiber Gas Raman Laser Source

2021 ◽  
Vol 41 (3) ◽  
pp. 0314001
Author(s):  
李昊 Li Hao ◽  
黄威 Huang Wei ◽  
裴闻喜 Pei Wenxi ◽  
周智越 Zhou Zhiyue ◽  
崔宇龙 Cui Yulong ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Raman Laser ◽  
Laser Source

scholarly journals Direct Amplification of High Energy Pulsed Laser in Fiber-Single Crystal Fiber with High Average Power

Crystals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 216
Author(s):  
Feng Li ◽  
Zhi Yang ◽  
Zhiguo Lv ◽  
Yang Yang ◽  
Yishan Wang ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Single Crystal ◽  
Stimulated Raman Scattering ◽  
Average Power ◽  
High Energy ◽  
Laser Source ◽  
High Average Power ◽  
Double Pass ◽  
Two Stage ◽  
Crystal Fiber

A laser master oscillator power amplifier (MOPA) system consisting of a fiber amplifier and a two-stage Yb:YAG single crystal fiber (SCF) is experimentally studied. The nonlinear stimulated Raman scattering (SRS) is avoided by limiting the output power of the fiber preamplifier to 600 mW. Due to the benefit from the low nonlinearity and high amplification gain of the SCF, a laser pulse duration of 16.95 ps and a high average power of 41.7 W at a repetition rate of 250 kHz are obtained by using a two-stage polarization controlled double-pass amplification of Yb:YAG SCF, corresponding to an output energy of 166.8 μJ and a peak power of 9.84 MW, respectively. The polarization controlled SCF amplification scheme achieved a gain as high as more than 69 times. During the amplification, the spectra gain narrowing effect and the polarization controlled four-pass amplification setup are also studied. The laser spectrum is narrowed from over 10 nm to less than 3 nm, and the pulse width is also compressed to hundreds of femtosecond by dechirping the laser pulse. This compact-sized, cost-effective laser source can be used in laser micromachining, or as the seeder source for generating much higher power and energy laser for scientific research. For some applications which need femtosecond laser, this laser source can also be compressed to femtosecond regime.

Mid-infrared cascaded Raman laser source by gas-filled hollow-core fibers (Conference Presentation)

2019 ◽  
Author(s):  
Zefeng Wang ◽  
Wei Huang ◽  
Xiaoming Xi ◽  
Chen Shi ◽  
Wenguang Liu ◽  
...  
Keyword(s):  
Raman Laser ◽  
Laser Source ◽  
Hollow Core ◽  
Mid Infrared
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