F. Falcoz | Paris Sud XI University (original) (raw)
Papers by F. Falcoz
CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics
Recently, Ce:LiCAF’ and Ce:LiSAF* were found to be tunable UV laser materials suitable for pumpin... more Recently, Ce:LiCAF’ and Ce:LiSAF* were found to be tunable UV laser materials suitable for pumping in an all-solid-state approach using the 4th harmonic of diode-pumped Nd lasers. The progress made with the Ce:LiCAF/Ce:LiSAF materials offers numerous advantages3 with respect to all other traditional sources of tunable UV radiation. These include conversion efficiency up to -50%: wide continuous tunability -280-315 nm,5 and high potential for immediate tunable W ultrashort pulse application^.^ This is a strong incentive for further aimed searches for new materials capable of lasing with wide W tunability using solid-state (nonexcimer) direct W pumping. Here we report some empirical criteria worked out for the mentioned searches. Spectroscopic features of Ce3+activated SrAIF,-the crystal (hitherto known as an active medium for tunable NIR laser when activated by Ce3+ ions6) chosen for our investigation based on the above criteria-are described in relevance to its potential as an active medium for an all-solid-state tunable UV laser with direct W pumping. The Ce3+-doped tetragonal SAF (Ce:SAF) crystals were grown from carbon crucibles in an inert (Ar) atmosphere using the BridgmanStockbarger technique. The Ce3+ content (in the melt) varied from 0.05 to 0.8 at .Yo. The polarized absorption spectra for a Ce:SAF sample with doping concentration of -0.5 at .% are indicated in Fig. 1. They display, within the 220-300 nm spectral region, a three-band absorption feature centered around 250 nm with the essentially .Ti.-polarized first Ce3+ 4f-5d absorption band nearly centered at 266 nm. This is ideal for direct solid-state W pumping by the 4th harmonic of a Nd laser. Ce3+ room-temperature, polarized fluorescence spectra for the same Ce:SAF sample excited by frequency-quadrupled output of a Q-switched Nd:YAG laser are shown in Fig. 2. The observed Ce3+ fluorescence lifetime was found to be 31 2 5 ns. Fluorescence spans the spectral region of 280-370 nm; it is practically structureless and centered at 316 nm. The Tand u-polarized components have approxi-
Optics Letters, 1995
We describe a diode-pumped Kerr-lens mode-locked Cr 31 :LiSrAlF 6 laser that produces 50 mW of 70... more We describe a diode-pumped Kerr-lens mode-locked Cr 31 :LiSrAlF 6 laser that produces 50 mW of 70-fs pulses in the 820-890-nm range when pumped by two red diodes of 400 mW each. By using a lower-transmission output coupler we have demonstrated for the f irst time to our knowledge a self-starting regime with an output power of 10 mW and 55-fs pulses.
A new conduction cooled compact laser for laser induced spectroscopy is presented. An oscillator ... more A new conduction cooled compact laser for laser induced spectroscopy is presented. An oscillator combined to an amplifier is designed to generate 30mJ at 1m with a good spatial quality.
The European Physical Journal Special Topics
Conference on Lasers and Electro-Optics, 2016
We demonstrate a hybrid OPCPA/CPA front-end for PW Ti:Sapphire systems delivering 3 mJ, 27 fs, CE... more We demonstrate a hybrid OPCPA/CPA front-end for PW Ti:Sapphire systems delivering 3 mJ, 27 fs, CEP-stable pulses at ~800 nm with a temporal contrast exceeding 2.10-13 and 80 mrad CEP fluctuations.
Post-compression of radially polarized 30 fs pulses was performed in multiple thin fused silica p... more Post-compression of radially polarized 30 fs pulses was performed in multiple thin fused silica plates for the first time. Sub-7 fs pulses with 90 µJ were obtained after re-compression. This approach is scalable in energy.
MRS Proceedings
This paper is devoted on Cr:LiSAF laser pumped by cw visible GaAlInP diode at 670nm. Ouput power ... more This paper is devoted on Cr:LiSAF laser pumped by cw visible GaAlInP diode at 670nm. Ouput power of more than 60 mW at 850 nm has been obtained with a 500 mW pump laserdiode and the laser is tunable from 810 to 900 nm.
CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics, 2000
Conference on Lasers and Electro-Optics Europe, 1994
Proceedings of European Meeting on Lasers and Electro-Optics CLEOE-96, 1996
Quaternary International - QUATERN INT, 1996
Summary form only given. In Q-switched lasers, one of the most important parameters is the small ... more Summary form only given. In Q-switched lasers, one of the most important parameters is the small signal gain in the laser medium that determines the buildup time and the energy of the pulse. In Cr:LiSAF crystal, the small signal gain dramatically depends on the pumping configuration and on physical limits imposed by up-conversion process and by thermal quenching of fluorescence. In this work, we have developed an experimental method for the investigation of small signal gain per round-trip in situ (i.e. inside the cavity). We next defined the best pumping configuration for a 3% doped Cr:LiSAF crystal pumped by two diodes emitting 400 mW each at 670 nm.
The European Physical Journal Special Topics
This report presents the conceptual design of a new European research infrastructure EuPRAXIA. Th... more This report presents the conceptual design of a new European research infrastructure EuPRAXIA. The concept has been established over the last four years in a unique collaboration of 41 laboratories within a Horizon 2020 design study funded by the European Union. EuPRAXIA is the first European project that develops a dedicated particle accelerator research infrastructure based on novel plasma acceleration concepts and laser technology. It focuses on the development of electron accelerators and underlying technologies, their user communities, and the exploitation of existing accelerator infrastructures in Europe. EuPRAXIA has involved, amongst others, the international laser community and industry to build links and bridges with accelerator science — through realising synergies, identifying disruptive ideas, innovating, and fostering knowledge exchange. The Eu-PRAXIA project aims at the construction of an innovative electron accelerator using laser- and electron-beam-driven plasma wak...
Summaries of Papers Presented at the Lasers and Electro-Optics. CLEO '02. Technical Diges, 2002
... energy Air-cooled UV Laser E. Durand, I. Geoffray and E Falcoz, THALES LASER, RD 128, BP 46,9... more ... energy Air-cooled UV Laser E. Durand, I. Geoffray and E Falcoz, THALES LASER, RD 128, BP 46,91401 Orsay Cedex, France, Email: eric.durand@fi. ... Ref er en ce s 1. RF Wu, PB Phua, KS Lai,YL Lim, Ernest Lau, and Andrey Chng, Christophe Bonnin and Dominique Lupinski ...
A new conduction cooled compact laser for laser induced spectroscopy is presented. An oscillator ... more A new conduction cooled compact laser for laser induced spectroscopy is presented. An oscillator combined to an amplifier is designed to generate 30mJ at 1mum with a good spatial quality.
Journal De Physique Iv - J PHYS IV, 1994
We present here a tunable diode-pumped Cr:LiSAF laser which produces up to 78 mW at 850 nm with a... more We present here a tunable diode-pumped Cr:LiSAF laser which produces up to 78 mW at 850 nm with a 500 mW pump laser diode. The laser is tunable from 810 to 900 nm.
Optics Letters, 1997
We have developed a Cr:LiSrGaF 6 laser that produces, in Q-switched operation, four times as much... more We have developed a Cr:LiSrGaF 6 laser that produces, in Q-switched operation, four times as much energy (12 mJ at 10 kHz) as a Cr:LiSrAlF 6 laser under the same conditions of pumping (four red diodes emitting 400 mW). By using a theoretical model for small-signal gain calculations, we show that these better performances are mainly attributable to the fact that thermal quenching of f luorescence is lower in Cr:LiSrGaF 6 than in Cr:LiSrAlF 6 .
CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics
Recently, Ce:LiCAF’ and Ce:LiSAF* were found to be tunable UV laser materials suitable for pumpin... more Recently, Ce:LiCAF’ and Ce:LiSAF* were found to be tunable UV laser materials suitable for pumping in an all-solid-state approach using the 4th harmonic of diode-pumped Nd lasers. The progress made with the Ce:LiCAF/Ce:LiSAF materials offers numerous advantages3 with respect to all other traditional sources of tunable UV radiation. These include conversion efficiency up to -50%: wide continuous tunability -280-315 nm,5 and high potential for immediate tunable W ultrashort pulse application^.^ This is a strong incentive for further aimed searches for new materials capable of lasing with wide W tunability using solid-state (nonexcimer) direct W pumping. Here we report some empirical criteria worked out for the mentioned searches. Spectroscopic features of Ce3+activated SrAIF,-the crystal (hitherto known as an active medium for tunable NIR laser when activated by Ce3+ ions6) chosen for our investigation based on the above criteria-are described in relevance to its potential as an active medium for an all-solid-state tunable UV laser with direct W pumping. The Ce3+-doped tetragonal SAF (Ce:SAF) crystals were grown from carbon crucibles in an inert (Ar) atmosphere using the BridgmanStockbarger technique. The Ce3+ content (in the melt) varied from 0.05 to 0.8 at .Yo. The polarized absorption spectra for a Ce:SAF sample with doping concentration of -0.5 at .% are indicated in Fig. 1. They display, within the 220-300 nm spectral region, a three-band absorption feature centered around 250 nm with the essentially .Ti.-polarized first Ce3+ 4f-5d absorption band nearly centered at 266 nm. This is ideal for direct solid-state W pumping by the 4th harmonic of a Nd laser. Ce3+ room-temperature, polarized fluorescence spectra for the same Ce:SAF sample excited by frequency-quadrupled output of a Q-switched Nd:YAG laser are shown in Fig. 2. The observed Ce3+ fluorescence lifetime was found to be 31 2 5 ns. Fluorescence spans the spectral region of 280-370 nm; it is practically structureless and centered at 316 nm. The Tand u-polarized components have approxi-
Optics Letters, 1995
We describe a diode-pumped Kerr-lens mode-locked Cr 31 :LiSrAlF 6 laser that produces 50 mW of 70... more We describe a diode-pumped Kerr-lens mode-locked Cr 31 :LiSrAlF 6 laser that produces 50 mW of 70-fs pulses in the 820-890-nm range when pumped by two red diodes of 400 mW each. By using a lower-transmission output coupler we have demonstrated for the f irst time to our knowledge a self-starting regime with an output power of 10 mW and 55-fs pulses.
A new conduction cooled compact laser for laser induced spectroscopy is presented. An oscillator ... more A new conduction cooled compact laser for laser induced spectroscopy is presented. An oscillator combined to an amplifier is designed to generate 30mJ at 1m with a good spatial quality.
The European Physical Journal Special Topics
Conference on Lasers and Electro-Optics, 2016
We demonstrate a hybrid OPCPA/CPA front-end for PW Ti:Sapphire systems delivering 3 mJ, 27 fs, CE... more We demonstrate a hybrid OPCPA/CPA front-end for PW Ti:Sapphire systems delivering 3 mJ, 27 fs, CEP-stable pulses at ~800 nm with a temporal contrast exceeding 2.10-13 and 80 mrad CEP fluctuations.
Post-compression of radially polarized 30 fs pulses was performed in multiple thin fused silica p... more Post-compression of radially polarized 30 fs pulses was performed in multiple thin fused silica plates for the first time. Sub-7 fs pulses with 90 µJ were obtained after re-compression. This approach is scalable in energy.
MRS Proceedings
This paper is devoted on Cr:LiSAF laser pumped by cw visible GaAlInP diode at 670nm. Ouput power ... more This paper is devoted on Cr:LiSAF laser pumped by cw visible GaAlInP diode at 670nm. Ouput power of more than 60 mW at 850 nm has been obtained with a 500 mW pump laserdiode and the laser is tunable from 810 to 900 nm.
CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics, 2000
Conference on Lasers and Electro-Optics Europe, 1994
Proceedings of European Meeting on Lasers and Electro-Optics CLEOE-96, 1996
Quaternary International - QUATERN INT, 1996
Summary form only given. In Q-switched lasers, one of the most important parameters is the small ... more Summary form only given. In Q-switched lasers, one of the most important parameters is the small signal gain in the laser medium that determines the buildup time and the energy of the pulse. In Cr:LiSAF crystal, the small signal gain dramatically depends on the pumping configuration and on physical limits imposed by up-conversion process and by thermal quenching of fluorescence. In this work, we have developed an experimental method for the investigation of small signal gain per round-trip in situ (i.e. inside the cavity). We next defined the best pumping configuration for a 3% doped Cr:LiSAF crystal pumped by two diodes emitting 400 mW each at 670 nm.
The European Physical Journal Special Topics
This report presents the conceptual design of a new European research infrastructure EuPRAXIA. Th... more This report presents the conceptual design of a new European research infrastructure EuPRAXIA. The concept has been established over the last four years in a unique collaboration of 41 laboratories within a Horizon 2020 design study funded by the European Union. EuPRAXIA is the first European project that develops a dedicated particle accelerator research infrastructure based on novel plasma acceleration concepts and laser technology. It focuses on the development of electron accelerators and underlying technologies, their user communities, and the exploitation of existing accelerator infrastructures in Europe. EuPRAXIA has involved, amongst others, the international laser community and industry to build links and bridges with accelerator science — through realising synergies, identifying disruptive ideas, innovating, and fostering knowledge exchange. The Eu-PRAXIA project aims at the construction of an innovative electron accelerator using laser- and electron-beam-driven plasma wak...
Summaries of Papers Presented at the Lasers and Electro-Optics. CLEO '02. Technical Diges, 2002
... energy Air-cooled UV Laser E. Durand, I. Geoffray and E Falcoz, THALES LASER, RD 128, BP 46,9... more ... energy Air-cooled UV Laser E. Durand, I. Geoffray and E Falcoz, THALES LASER, RD 128, BP 46,91401 Orsay Cedex, France, Email: eric.durand@fi. ... Ref er en ce s 1. RF Wu, PB Phua, KS Lai,YL Lim, Ernest Lau, and Andrey Chng, Christophe Bonnin and Dominique Lupinski ...
A new conduction cooled compact laser for laser induced spectroscopy is presented. An oscillator ... more A new conduction cooled compact laser for laser induced spectroscopy is presented. An oscillator combined to an amplifier is designed to generate 30mJ at 1mum with a good spatial quality.
Journal De Physique Iv - J PHYS IV, 1994
We present here a tunable diode-pumped Cr:LiSAF laser which produces up to 78 mW at 850 nm with a... more We present here a tunable diode-pumped Cr:LiSAF laser which produces up to 78 mW at 850 nm with a 500 mW pump laser diode. The laser is tunable from 810 to 900 nm.
Optics Letters, 1997
We have developed a Cr:LiSrGaF 6 laser that produces, in Q-switched operation, four times as much... more We have developed a Cr:LiSrGaF 6 laser that produces, in Q-switched operation, four times as much energy (12 mJ at 10 kHz) as a Cr:LiSrAlF 6 laser under the same conditions of pumping (four red diodes emitting 400 mW). By using a theoretical model for small-signal gain calculations, we show that these better performances are mainly attributable to the fact that thermal quenching of f luorescence is lower in Cr:LiSrGaF 6 than in Cr:LiSrAlF 6 .