scholarly journals A Self-Consistent Quantum Field Theory for Random Lasing

2019 ◽  
Vol 9 (12) ◽  
pp. 2477 ◽  
Author(s):  
Andreas Lubatsch ◽  
Regine Frank
Keyword(s):  
Phase Transition ◽  
Random Media ◽  
Theoretical Method ◽  
Pump Intensity ◽  
Stimulated Emission ◽  
Random Laser ◽  
Central Feature ◽  
Quantum Field ◽  
Random Lasing ◽  
Correlation Volume

The spatial formation of coherent random laser modes in strongly scattering disordered random media is a central feature in the understanding of the physics of random lasers. We derive a quantum field theoretical method for random lasing in disordered samples of complex amplifying Mie resonators which is able to provide self-consistently and free of any fit parameter the full set of transport characteristics at and above the laser phase transition. The coherence length and the correlation volume respectively is derived as an experimentally measurable scale of the phase transition at the laser threshold. We find that the process of stimulated emission in extended disordered arrangements of active Mie resonators is ultimately connected to time-reversal symmetric multiple scattering in the sense of photonic transport while the diffusion coefficient is finite. A power law is found for the random laser mode diameters in stationary state with increasing pump intensity.

scholarly journals A Self-Consistent Quantum Field Theory for Random Lasing

2019 ◽  
Author(s):  
Andreas Lubatsch ◽  
Regine Frank
Keyword(s):  
Phase Transition ◽  
Random Media ◽  
Theoretical Method ◽  
Stimulated Emission ◽  
Random Laser ◽  
Central Feature ◽  
Quantum Field ◽  
Random Lasing ◽  
Laser Mode ◽  
Laser Modes

The spatial formation of coherent random laser modes in strongly scattering disordered random media is a central feature in the understanding of the physics of random lasers. We derive a quantum field theoretical method for random lasing in disordered samples of complex amplifying Mie resonators which is able to provide self-consistently and free of any fit parameter the full set of transport characteristics at and above the laser phase transition. The coherence length and the correlation volume respectively is derived as an experimentally measurable scale of the phase transition at the laser threshold. We find that the process of stimulated emission in extended disordered arrangements of active Mie resonators is ultimately connected to time-reversal symmetric multiple scattering in the sense of photonic transport while the diffusion coefficient is finite. A power law is found for the random laser mode diameters in stationary state with increasing pump intensity.

scholarly journals Random Laser Action in Dye-Doped Polymer Media with Inhomogeneously Distributed Particles and Gain

2019 ◽  
Vol 9 (17) ◽  
pp. 3499
Author(s):  
Takashi Okamoto ◽  
Masaki Mori
Keyword(s):  
Random Media ◽  
Laser Action ◽  
Experimental Results ◽  
Random Laser ◽  
Random Lasing ◽  
Peak Intensity ◽  
Spectral Narrowing ◽  
Bubble Structure ◽  
Doped Polymer ◽  
Diffusion Properties

The properties of random lasing are investigated for bubble-structure (BS) dye-doped polymer random media in which non-scattering and no-gain regions are distributed. Experimental results demonstrate that, for BS random media, spectral narrowing and a decrease in the number of spectral spikes occur for incoherent and coherent random lasing, respectively, resulting in an increase in the spectral peak intensity in both cases. These features were observed owing to the differences in the diffusion properties of the pumping and emitted lights.

Sign phase transition and directed paths in random media

JETP Letters ◽  
1996 ◽  
Vol 64 (4) ◽  
pp. 312-318 ◽  
Author(s):  
B. Spivak ◽  
S. Feng ◽  
F. Zeng
Keyword(s):  
Phase Transition ◽  
Random Media ◽  
Directed Paths

scholarly journals Polymer Lasing in a Periodic-Random Compound Cavity

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1194 ◽  
Author(s):  
Tianrui Zhai ◽  
Xiaofeng Wu ◽  
Songtao Li ◽  
Shuyan Liang ◽  
Lianze Niu ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Distributed Feedback ◽  
Interference Lithography ◽  
Random Laser ◽  
Random Lasing ◽  
Optically Pumped ◽  
Light Emitting ◽  
Grating Structure ◽  
Laser Sources

Simultaneous distributed feedback (DFB) lasing and linear polarized random lasing are observed in a compound cavity, which consists of a grating cavity and a random cavity. The grating cavity is fabricated by interference lithography. A light-emitting polymer doped with silver nanoparticles is spin-coated on the grating, forming a random cavity. DFB lasing and random lasing occur when the periodic-random compound cavity is optically pumped. The directionality and polarization of the random laser are modified by the grating structure. These results can potentially be used to design integrated laser sources.

Quantitative analysis of “Δl = ls − lg” to coherent random lasing in solution systems with a series of solvents ordered by refractive index

RSC Advances ◽  
2016 ◽  
Vol 6 (100) ◽  
pp. 98066-98070 ◽  
Author(s):  
Leicheng Yin ◽  
Yunyun Liang ◽  
Bo Yu ◽  
Yeping Wu ◽  
Jiajun Ma ◽  
...  
Keyword(s):  
Refractive Index ◽  
Quantitative Analysis ◽  
Laser Action ◽  
Random Laser ◽  
Random Lasing ◽  
Solution System ◽  
System P

Random laser action affected by solvents ordered by refractive index in solution system.

scholarly journals Electro-optic steering of random laser emission in liquid crystals

2018 ◽  
Vol 10 (4) ◽  
pp. 103 ◽  
Author(s):  
Gaetano Assanto ◽  
Sreekanth Perumbilavil ◽  
Armando Piccardi ◽  
Martti Kauranen
Keyword(s):  
Liquid Crystals ◽  
Optical Switching ◽  
Modulational Instability ◽  
Nematic Liquid Crystals ◽  
Photothermal Effect ◽  
Random Laser ◽  
Spatial Solitons ◽  
Random Lasing ◽  
Electro Optic ◽  
All Optical

Using an external low-frequency electric field applied to dye-doped nematic liquid crystals, we demonstrate that random lasing obtained by optical pumping can be steered in angular direction by routing an all-optical waveguide able to collect the emitted light. By varying the applied voltage from 0 to 2 V, we reduce the walk-off and sweep the random laser guided beam over 7 degrees. Full Text: PDF ReferencesV. S. Letokhov, "Generation of light by a scattering medium with negative resonance absorption," Sov. Phys. JETP 26 (4), 835 (1968). DirectLink H. Cao, J. Y. Xu, D. Z. Zhang, S.-H. Chang, S. T. Ho, E. W. Seelig, X. Liu, and R. P. H. Chang, "Spatial Confinement of Laser Light in Active Random Media," Phys. Rev. Lett. 84 (24), 5584 (2000). CrossRef D. S. Wiersma, "The physics and applications of random lasers," Nature Phys. 4 (5) 359-367 (2008). CrossRef D. Wiersma and S. Cavalieri, "A temperature-tunable random laser," Nature 414, 708-709 (2001). CrossRef G. Strangi, S. Ferjani, V. Barna, A. De Luca, N. Scaramuzza, C. Versace, C. Umeton, and R. Bartolino, "Random lasing and weak localization of light in dye-doped nematic liquid crystals," Opt. Express 14 (17), 7737 (2006). CrossRef G. Strangi, S. Ferjani, V. Barna, A. De Luca, C. Versace, N. Scaramuzza, and R. Bartolino, "Random lasing in dye doped nematic liquid crystals: the role of confinement geometry," SPIE 6587, 65870P (2007) doi: 10.1117/12.722887 CrossRef S. Ferjani, V. Barna, A. De Luca, C. Versace, and G. Strangi, "Random lasing in freely suspended dye-doped nematic liquid crystals," Opt. Lett. 33(6), 557-559 (2008). CrossRef S. Ferjani, L-V. Sorriso, V. Barna, A. De Luca, R. De Marco, and G. Strangi, "Statistical analysis of random lasing emission properties in nematic liquid crystals," Phys. Rev. E 78 (1) 011707 (2008). CrossRef H. Bian, F. Yao, H. Liu, F. Huang, Y. Pei, C. Hou, and X. Sun, "Optically controlled random lasing based on photothermal effect in dye-doped nematic liquid crystals," Liq. Cryst. 41 (10), 1436-1441 (2014) CrossRef C. R. Lee, S. H. Lin, C. H. Guo, S. H. Chang, T. S. Mo, and S. C. Chu, "All-optically controllable random laser based on a dye-doped polymer-dispersed liquid crystal with nano-sized droplets," Opt. Express 18 (3), 2406-2412 (2010) CrossRef S. Perumbilavil, A. Piccardi, O. Buchnev, M. Kauranen, G. Strangi, and G. Assanto, "Soliton-assisted random lasing in optically-pumped liquid crystals," Appl. Phys. Lett. 109(16), 161105 (2016); ibid. 110(1), 1019902 (2017). CrossRef S. Perumbilavil, A. Piccardi, O. Buchnev, M. Kauranen, G. Strangi, and G. Assanto, "All-optical guided-wave random laser in nematic liquid crystals", Opt. Express 25 (5), 4672-4679 (2017). CrossRef S. Perumbilavil, A. Piccardi, R. Barboza, O. Buchnev, M. Kauranen, G. Strangi, and G. Assanto, "Beaming random laser with soliton control," Nature Comm., in press (2018) CrossRef M. Peccianti, C. Conti, G. Assanto, A. De Luca and C. Umeton, "Routing of Anisotropic Spatial Solitons and Modulational Instability in liquid crystals," Nature 432, 733-737 (2004). CrossRef J. Beeckman, K. Neyts and M. Haeltermann, "Patterned electrode steering of nematicons," J. Opt. A - Pure Appl. Opt. 8 (2), 214-220 (2006). CrossRef A. Piccardi, M. Peccianti, G. Assanto, A. Dyadyusha and M. Kaczmarek, "Voltage-driven in-plane steering of nematicons," Appl. Phys. Lett. 94, 091106 (2009). CrossRef R. Barboza, A. Alberucci, and G. Assanto, "Large electro-optic beam steering with Nematicons", Opt. Lett. 36 (14), 2611–2613 (2011). CrossRef A. Piccardi, A. Alberucci, R. Barboza, O. Buchnev, M. Kaczmarek, and G. Assanto, "In-plane steering of nematicon waveguides across an electrically adjusted interface", Appl. Phys. Lett. 100 (25), 251107 (2012). CrossRef Y. V. Izdebskaya, "Routing of spatial solitons by interaction with rod microelectrodes," Opt. Lett. 39(6), 1681-1684 (2014). CrossRef A. Pasquazi, A. Alberucci, M. Peccianti, and G. Assanto, "Signal processing by opto-optical interactions between self-localized and free propagating beams in liquid crystals," Appl. Phys. Lett. 87, 261104 (2005). CrossRef S. V. Serak, N. V. Tabiryan, M. Peccianti and G. Assanto, "Spatial Soliton All-Optical Logic Gates", IEEE Photon. Technol. Lett. 18 (12), 1287-1289 (2006). CrossRef M. Peccianti, C. Conti, G. Assanto, A. De Luca and C. Umeton, "All Optical Switching and Logic Gating with Spatial Solitons in Liquid Crystals," Appl. Phys. Lett. 81(18), 3335-3337 (2002). CrossRef A. Fratalocchi, A. Piccardi, M. Peccianti and G. Assanto, "Nonlinearly controlled angular momentum of soliton clusters," Opt. Lett. 32(11), 1447-1449 (2007). CrossRef Y. Izdebskaya, V. Shvedov, G. Assanto, and W. Krolikowski, Nat. Comm. 8, 14452 (2017). CrossRef M. Peccianti and G. Assanto, "Nematicons," Phys. Rep. 516, 147-208 (2012). CrossRef Y. Izdebskaya, A. Desyatnikov, G. Assanto and Y. Kivshar, "Deflection of nematicons through interaction with dielectric particles," J. Opt. Soc. Am. B 30(6), 1432-1437 (2013). CrossRef U. Laudyn, M. Kwasny, F. Sala, M. Karpierz, N. F. Smyth, and G. Assanto,"Curved solitons subject to transverse acceleration in reorientational soft matter," Sci. Rep. 7, 12385 (2017). CrossRef A. Alberucci, A. Piccardi, M. Peccianti, M. Kaczmarek and G. Assanto, "Propagation of spatial optical solitons in a dielectric with adjustable nonlinearity", Phys. Rev. A 82, 023806 (2010). CrossRef

scholarly journals Random laser tailored by directional stimulated emission

2012 ◽  
Vol 85 (4) ◽  
Author(s):  
M. Leonetti ◽  
C. Conti ◽  
C. López
Keyword(s):  
Stimulated Emission ◽  
Random Laser

scholarly journals CONFINEMENT–DECONFINEMENT PHASE TRANSITION IN HOT AND DENSE QCD AT LARGE N

2010 ◽  
Vol 25 (02n03) ◽  
pp. 543-553 ◽  
Author(s):  
ARIEL R. ZHITNITSKY
Keyword(s):  
Field Theory ◽  
Phase Transition ◽  
Transition Point ◽  
Sudden Change ◽  
Phase Transition Point ◽  
Critical Values ◽  
Quantum Field ◽  
Holographic Model ◽  
Large N ◽  
Deconfinement Phase Transition

We conjecture that the confinement–deconfinement phase transition in QCD at large number of colors N and Nf ≪ N at T ≠ 0 and µ ≠ 0 is triggered by the drastic change in θ behavior. The conjecture is motivated by the holographic model of QCD where confinement–deconfinement phase transition indeed happens precisely at T = Tc where θ dependence experiences a sudden change in behavior. The conjecture is also supported by quantum field theory arguments when the instanton calculations (which trigger the θ dependence) are under complete theoretical control for T > Tc, suddenly break down immediately below T < Tc with sharp changes in the θ dependence. Finally, the conjecture is supported by a number of numerical lattice results. We employ this conjecture to study confinement–deconfinement phase transition of hot and dense QCD in large N limit by analyzing the θ dependence. We estimate the critical values for Tc and µc where the phase transition happens by approaching the critical values from the hot and/or dense regions where the instanton calculations are under complete theoretical control. We also describe some defects of various codimensions within a holographic model of QCD by focusing on their role around the phase transition point.

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