scholarly journals Spectroscopic Features of Raman Gain Profiles in Single-Mode Fibers Based on Silica Glass

2018 ◽  
Vol 63 (8) ◽  
pp. 683 ◽  
Author(s):  
I. V. Serdeha ◽  
V. I. Grygoruk ◽  
G. S. Felinskyi
Keyword(s):  
Silica Glass ◽  
Single Mode ◽  
Raman Gain ◽  
Oscillatory Dynamics ◽  
Experimental Profile ◽  
Raman Lasers ◽  
Gain Profile ◽  
Analytic Expressions ◽  
Amorphous Glass ◽  
Gaussian Decomposition

The spectroscopic analysis of the frequency distribution of the amplification of optical radiation due to the Raman effect (Raman gain profile) in single-mode fibers based on silica glass has been carried out in the region of Stokes frequency shifts from 0 to 1400 cm−1. The Raman gain profiles are determined from the experimental spectra of spontaneous scattering for widespread fibers, namely for pure SiO2, GeO2, P2O5, and TiO2 doped fibers. The analytic expressions of the Raman gain profiles are given. They are obtained, by using the Gaussian decomposition by means of 11–12 modes, and the experimental profile is approximated with an accuracy of not less than 0.3%. The decomposition results are analyzed in terms of the fundamental oscillatory dynamics of molecular nanocomplexes in amorphous glass, as well as in the application aspect of the modeling of photonics devices. Examples of the proposed method applications are presented for the analysis of noise parameters of the fiber Raman amplifiers and for the generation bandwidth in fiber Raman lasers.

TiO2-Doped Single-Mode Fiber as Active Material for Raman Lasers

2017 ◽  
Vol 753 ◽  
pp. 173-179 ◽  
Author(s):  
Georgii S. Felinskyi ◽  
Iryna V. Serdeha ◽  
Valeriy I. Grygoruk
Keyword(s):  
Spectroscopic Analysis ◽  
Active Material ◽  
Single Mode ◽  
Analytic Form ◽  
Single Mode Fiber ◽  
Fiber Types ◽  
Raman Gain ◽  
Raman Lasers ◽  
Gain Profile ◽  
Gain Threshold

The properties of TiO2-doped fiber are considered as optoelectronic material in our work. The advantages of such fiber have been studied with the aim of its application to active medium in Raman fiber lasers. The comparison of spontaneous Raman spectra and corresponding gain profiles in TiO2-doped and GeO2-doped fiber is presented. Raman gain profiles were obtained over a broad spectral range of Stokes shifted frequencies up to 1400 cm-1(42 THz). The spectral decomposition using multimode Gaussian components has been performed for both Raman gain profiles. High accuracy analytic form of Raman gain profile of TiO2-doped fiber is obtained using 12 components. The pump power of Raman gain threshold is introduced as the function of wavelength within the telecommunication windows for both fiber types. Our spectroscopic analysis allows presenting the numerical results on lasing bandwidth and Raman gain threshold inTiO2-doped single-mode fiber. It has been shown that the lasing bandwidth in TiO2-doped fiber may be almost twice wider than the lasing bandwidth in standard GeO2-doped fiber.

Comment on “Invalidation of the Intracavity Opto-galvanic Method for Radiocarbon Detection” by Cantwell G Carson, Martin Stute, Yinghuang Ji, Roseline Polle, Arthur Reboul, and Klaus S Lackner

Radiocarbon ◽  
2016 ◽  
Vol 58 (1) ◽  
pp. 227-230 ◽  
Author(s):  
Daniel E Murnick
Keyword(s):  
Narrow Band ◽  
Single Mode ◽  
Laser Wavelength ◽  
Absorption Model ◽  
Linear Absorption ◽  
Broadband Absorption ◽  
Laser Gain ◽  
Cell Discharge ◽  
Optogalvanic Spectroscopy ◽  
Gain Profile

AbstractCarson et al. (2016) have measured the optogalvanic response of an intracavity cell discharge containing carbon dioxide enriched in radiocarbon in a 14CO2 laser, and compared same to an unenriched sample. The measurement was carried out by modulating the laser wavelength while slowly tuning through the laser gain profile. The results of the measurements are claimed to “invalidate the optogalvanic method for radiocarbon detection.” A broadband linear absorption model is presented in support of this hypothesis. In fact, the experimental design was such as to minimize any possibility for 14C detection, and the model presented is not relevant to their experiment. Crucial control measurements were not carried out and the model used did not differentiate between broadband absorption spectroscopy and intracavity optogalvanic spectroscopy (ICOGS) with a narrow-band single-mode CO2 laser.

Controllable single-mode random laser using stimulated Raman gain

2014 ◽  
Vol 39 (15) ◽  
pp. 4537 ◽  
Author(s):  
Ehsan Shojaie ◽  
Azam Mirzaei ◽  
Alireza Bahrampour
Keyword(s):  
Single Mode ◽  
Random Laser ◽  
Raman Gain ◽  
Stimulated Raman

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.

NUMERICAL COMPARISON OF MULTI-PUMP RAMAN AMPLIFIERS BASED ON PHOTONIC CRYSTAL FIBER AND STANDARD SINGLE MODE FIBER

2007 ◽  
Vol 21 (02n03) ◽  
pp. 115-122
Author(s):  
TAO SHANG ◽  
JIANPING CHEN ◽  
XINWAN LI ◽  
JUNHE ZHOU
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Single Mode ◽  
High Gain ◽  
Gain Medium ◽  
Single Mode Fiber ◽  
Numerical Comparison ◽  
Raman Gain ◽  
Crystal Fiber ◽  
Raman Amplifiers

This paper presents a numerical analysis and comparison on the performance of multi-pump gain-flat Raman amplifiers based on triangular photonic crystal fiber and conventional fiber. It is demonstrated that the extra 5.93 dB Raman net gain can be achieved in the L-band when PCF acts as Raman gain medium. The noise performance of the two amplifiers are also calculated and compared. Comparison with the data of published literature was also carried out to verify our analysis. The results showed that PCF is the appropriate candidate for high gain Raman amplifiers.

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