NATIONAL INSTITUTE for LASER, PLASMA and RADIATION PHYSICS
   LABORATORY of SOLID-STATE QUANTUM ELECTRONICS


CEEX 05 D11 27 2005
TITLU:             PRINCIPII DE EXTINDERE SI OPTIMIZARE A PERFORMANTELOR LASERILOR CU MEDIU ACTIV SOLID
TITLE:             SCALING-UP AND OPTIMIZING THE OUTPUT PERFORMANCES OF SOLID-STATE LASERS
 
FINANTARE :   Autoritatea Nationala pentru Cercetare Stiintifica, Ministerul Educatiei si Cercetarii, Bucuresti, Romania
FUNDED BY:   National Authority for Scientific Research, Ministry of Edcuation and Research, Bucharest, Romania

DIRECTOR DE PROIECT:   Dr. Traian Dascalu
PROJECT MANAGER:       Dr. Traian Dascalu
Email: traian.dascalu@inflpr.ro

DURATA PROIECTULUI:        2005 - 2008
CONDUCATOR PROIECT:      INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU FIZICA LASERILOR, PLASMEI SI RADIATIEI INFLPR DIN BUCURESTI

PARTENERI:                        1. UNIVERSITATEA BUCURESTI, FACULTATEA DE FIZICA, CATEDRA DE OPTICA
                                           2. UNIVERSITATEA "POLITEHNICA" BUCURESTI, DEPARTAMENTUL DE FIZICA
                                           3. UNIVERSITATEA  PITESTI, FACULTATEA DE ELECTRONICA

http://rawmedcol.com/

OBIECTIVUL PROIECTULUI
Obiectivul general al proiectului este identificarea, pe baza utilizarii mai complete a proprietatilor materialelor laser si a unor conceptii avansate de constructie a rezonatorului laser, a unor solutii si principii de extindere si optimizare a performantelor laserilor cu solid si de demonstrare a acestora intr-o serie de cazuri de mare perspectiva pentru extinderea aplicatiilor laserilor cu solid. Realizarea acestui obiectiv general implica realizarea urmatoarelor obiective particulare:

Obiectiv I
OPTIMIZAREA SI CONTROLUL PROCESELOR DE POMPAJ, EMISIEI LASER SI EFECTELOR TERMICE IN LASERI CU EMISIE CONTINUA IN PROCESE DIRECTE SAU NELINEARE
(i) Modelarea proceselor de emisie si identificarea modalitatilor de crestere a eficientei pompajului  si de control al configuratiei campului de pompaj in interiorul mediului activ, modalitati si solutii tehnice pentru cresterea eficientei pompajului in configuratii de pompaj longitudinal si trasversal;
(ii) Modelarea fizico-matematica a proceselor de generare de caldura prin procese neradiative in materialele laser sub pompaj, studiul efectelor generarii de caldura (efecte termo-optice, efecte mecanice), caracterizarea efectelor termice, solutii avansate pentru cresterea eficientei proceselor de disipare a caldurii si de control al configuratiei campului termic;
(iii) Modelarea si studiul emisiei laser in regim continuu in laseri cu Yb (infrarosu) si Pr (vizibil);
(iv) Solutii pentru cresterea eficientei si plajei de putere pentru laserii in vizibil (albastru, verde, rosu) bazati pe procese nelineare implicand radiatia in infrarosu in domeniile 0.9 µm (Nd), 1 µm (Nd, Yb) si 1.3 µm (Nd).
Obiective masurabile: Baze de date privind modalitatile de control al proceselor de pompaj si de generare de caldura, lucrari stiintifice, montaje demonstrative.

Obiectiv II
PRINCIPII SI SOLUTII PENTRU OPTIMIZAREA LASERILOR CU EMISIE IN IMPULSURI LA POMPAJ CU DIODE LASER.
LASERI MINIATURALI CU Nd, EMISIE IN DOMENIUL FEMTOSECUNDELOR IN LASERI CU Yb 
i) Modelarea proceselor de emisie in impulsuri in regim de comutare pasiva in laseri miniaturali cu Nd sub pompaj cuasi-continuu cu diode laser, identificarea si demonstrarea modalitatilor de crestere a parametrilor emisiei pentru aplicatii specifice (ignitie laser);
(ii) Modelarea proceselor de emisie, identificarea si demonstrarea solutiilor constructive pentru generare de impulsuri ultrascurte in laserii cu Yb.
Obiective masurabile: Baze de date, lucrari stiintifice, montaje demonstrative

REZULTATE

I. LUCRARI PUBLICATE IN REVISTE CU REFERENTI
6. N. Pavel, C. Kränkel, R. Peters, K. Petermann, and G. Huber, “In-band pumping of Nd-vanadate thin-disk lasers,” Appl. Phys. B. 91 (3-4), 415-419 (2008).
5. C. Dascalu, C. Uncheselu, N. Eseanu, and A.N. Alexe-Ionescu, "Dye adsorption alteration of anchoring properties of planar orienting films," J. of Optoelecton. and Advanced Materials 10 (2), 363-368 (2008).
4. K. Lünstedt, N. Pavel, K. Petermann, and G. Huber, “Continuous-wave simultaneous dual-wavelength operation at 912 nm and 1063 nm in Nd:GdVO4,” Appl. Phys. B 86 (1), 65-70 (2007).
3. A.L. Alexe-Ionescu, C. Uncheselu, L. Lucchetti, and G. Barbero, “Phenomenological model for the optically induced easy direction,” Physical Rev. E. 75, 021701 (2007).
2. N. Pavel , K. Lünstedt, K. Petermann, and G. Huber, “Multipass pumped Nd-based thin-disk lasers: continuous-wave laser operation at 1.06 and 0.9 μm with intracavity frequency doubling,” Appl. Opt. 46 (34), 
8256-8263 (2007).
1. T. Dascalu and T. Taira, “Highly efficent pumping configuration for microchip solid-state laser,“ Opt. Express 14 (2), 670-677 (2006).

II. LUCRARI PUBLICATE IN TARA
2. C. Gavrilă and I. Gruia, “Numerical Method for the Mirror with an Intensity-Dependent Reflection Coefficient,” Buletinul Stiinţific al Universităţii Tehnice De Constructii Bucureşti, vol. 2 (2006).
1. C. Gavrilă and I. Gruia, “Amplification of the Fundamental Radiation in the Presence of the Generated Second Harmonic Radiation,” Technical University of Civil Engineering Bucharest - Scientific Bulletin, Series: Mathematical Modelling In Civil Engineering, vol. 2 (2006).

III. CARTI PUBLICATE IN TARA
1. T. Dascalu si C. Dascalu, “Fizica Laserilor,” Editura Printech, 2006, ISBN 973-718-599-4.

IV. PROCEEDINGS

6. N. Pavel, K. Lünstedt, K. Petermann, and G. Huber, “Diode pumped Neodymium-based thin disk lasers,” Proc. SPIE, vol. 6785, 678504 (2007), ROMOPTO ’06: Eight Conference on Optics, 28-31 August, Sibiu, Romania.
5. N. Esanu, C. Dascalu, I. Palarie, C. Uncheselu, “Laser induced reorientation process in dye doped nematic systems role of the azo-dye structure," Proc. SPIE, vol. 6785, 67850U (2007), ROMOPTO '09: Eight Conference on Optics, 28-31 August, Sibiu, Romania.
4. T. Dascalu, and T. Taira, "Non linear mirror mode locking operation of edge pumped Yb:YAG/YAG laser,"  Proc. SPIE, vol. 6785, 78506 (2007), ROMOPTO '09:Eight Conference on Optics, 28-31 August, Sibiu, Romania.
3. T. Dascalu and C. Dascalu, “High-power lens-shape diode edge-pumped composite laser," Proc. SPIE, vol. 6785, B7850 (2007), ROMOPTO '09:Eight Conference on Optics, 28-31 August, Sibiu, Romania.
2. T. Dascalu and T. Taira, “Mode locking operation of Yb:KGW and Yb:YAG/YAG laser: non linear mirror technique," Proc. SPIE, vol. 6606, 60605 (2007), Advanced Laser Technology Conference, Septemeber 2006, Brasov, Romania.
1. C. Petre and T. Dascalu, “Passively Q-switched diode pumped CW Nd:GdVO4 -Cr4+:YAG  and Nd:YAG -Cr4+:YAG laser," Proc. SPIE, vol. 6606, A6060 (2007), Advanced Laser Technology Conference, September 2006, Brasov, Romania.

V.  PARTICIPARI LA CONFERINTE INTERNATIONALE
13. N. Pavel, C. Kränkel, R. Peters, K. Petermann, and G. Huber, “High-Power Emission of Nd-Vanadate Thin-Disk Lasers In-Band Pumped at 0.88 μm Directly into the Emitting Level,” CLEO/QELS 2008 Conference, May 4-9, 2008, San Jose, California, USA, presentation JTuA1.
12. N. Pavel, C. Kränkel, R. Peters, K. Petermann, and G. Huber, “In-band pumped, high-power intracavity frequency doubled Nd-vanadate thin-disk lasers at 530 nm,” Advanced Solid-State Photonics Conference, January 27-30, 2008, Nara, Japan, presentation MC41.
11. Y. Oishi, T. Dascalu, K. Midorikawa, T. Taira, “Thermal-birefringence-induced local depolarization in thin YAG ceramics,” Technical Digest of Advanced Solid-State Photonics (ASSP), January 2008, Nara, Japan, paper MC 15.
10. T. Dascalu, Y. Oishi, M. Tsunekane, K. Midorikawa, and T. Taira, “Thermally induced birefringence in edge-pumped microchip Yb:YAG ceramic,” CLEO/Europe-IQEC 2007 Conference, June 17-22, Munich, Germany, presentation CA-32-MON.
9. T. Dascalu, "High-power Microchip Solid-State Lasers and Application,”The First International Conference on Industrial Applications of Lasers, INDLAS 2007, May 23-25, Bran, Romania.
8. N. Pavel and V. Lupei, “High-power continuous wave Nd lasers under diode pumping directly in the 4F3/2 emitting level,” The First International Conference on Industrial Applications of Lasers, INDLAS 2007, May 23-25, Bran, Romania.
7. C. Petre, N. Vasile, N. Pavel, T. Dascalu, “Continuous-wave diode end-pumped Nd:YAG and Nd:GdVO4 lasers passively Q-switched by Cr4+:YAG. Comparative study for industrial applications,” The First International Conference on Industrial Applications of Lasers, INDLAS 2007, May 23-25, Bran, Romania.
6. N. Pavel, K. Lünstedt, K. Petermann, G. Huber, “Continuous-wave high power green generation by intracavity frequency doubling of Nd-based thin-disk lasers,” CLEO/Europe-IQEC 2007 Conference, June 17-22, Munich, Germany, presentation CA4-4-TUE.
5. N. Pavel, K. Lünstedt, K. Petermann,  G. Huber, “Nd-vanadate thin-disk lasers under diode pumping into the 4F5/2 and 4F3/2 levels,” CLEO/QELS 2007 Conference, May 6-11, Baltimore, Maryland, USA, presentation JWA90.
4. Y. Oishi, T. Dascalu, M. Tsunekane, K. Midorikawa, T. Taira, "Study of depolarization in ceramic Yb:YAG microchip," Extended Abstracts, 54th Spring Meeting for Jpn. Society of Appl. Phys., (2007.3) Japan.
3. C. Gavrilă and I. Gruia, “Numerical Method for the Mirror with an Intensity-Dependent Reflection Coefficient,” Buletinul Stiintific al Universitatii Tehnice de Constructii Bucuresti, nr. 2/2006.
2. C. Gavrilă and I. Gruia, “Amplification of  the Fundamental Radiation in the Presence of the Generated Second Harmonic Radiation,” Buletinul Stiintific al Universitatii Tehnice de Constructii Bucuresti, Series: Mathematical Modelling in Civil Engineering year XLIX, No. 2, June 2006.
1. T. Dascalu and T. Taira, “Highly Efficient Pumping Configuration for Microchip Solid-State Laser,” CLEO Conference on Lasers and Electro-Optics, 22-26 May 2006, Long Beach, USA.

VI. PATENTS
1. T. Dascalu and C. Dascalu, “Sistem Laser cu Mediu Activ in Forma de Lentila, Pompat Transversal cu Diode Laser”. Romanian Patent, No. RO122238 (27.02.2009).

Laboratory of Solid-State Quantum Electronics