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J J Rocca - One of the best experts on this subject based on the ideXlab platform.
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table top soft X Ray Lasers
Conference on Lasers and Electro-Optics, 2016Co-Authors: J J RoccaAbstract:Since first demonstrated plasma-based soft X-Ray Lasers have increased in average power and repetition rate by more than four orders of magnitude. The physics, status, applications, and prospects of table-top soft X-Ray Lasers is reviewed.
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high average power 100 hz repetition rate tabletop soft X Ray Lasers at sub 15 nm wavelengths
Physical Review A, 2014Co-Authors: Brendan A. Reagan, M. Berrill, Keith A Wernsing, Cory Baumgarten, Mark Woolston, J J RoccaAbstract:Efficient eXcitation of dense plasma columns at 100-Hz repetition rate using a tailored pump pulse profile produced a tabletop soft-X-Ray laser average power of 0.1 mW at = 13.9 nm and 20 W at = 11.9 nm from transitions of Ni-like Ag and Ni-like Sn, respectively. Lasing on several other transitions with wavelengths between 10.9 and 14.7 nm was also obtained using 0.9-J pump pulses of 5-ps duration from a compact diode-pumped chirped pulse amplification Yb:YAG laser. Hydrodynamic and atomic plasma simulations show that the pump pulse profile, consisting of a nanosecond ramp followed by two peaks of picosecond duration, creates a plasma with an increased density of Ni-like ions at the time of peak temperature that results in a larger gain coefficient over a temporally and spatially enlarged space leading to a threefold increase in the soft-X-Ray laser output pulse energy. The high average power of these compact soft-X-Ray Lasers will enable applications requiring high photon fluX. These results open the path to milliwatt-average-power tabletop soft-X-Ray Lasers.
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Advances in compact high repetition rate soft X-Ray Lasers
2010 23rd Annual Meeting of the IEEE Photonics Society, 2010Co-Authors: J J Rocca, B. A. Reagan, F. J. Furch, Y. Wang, D. Alessi, D. Martz, B. M. Luther, M. Berrill, A. H. CurtisAbstract:We review recent progress in the development of table-top soft X-Ray Lasers that includes the demonstration of a gain-saturated λ = 10.9 nm laser, and the first demonstration of an all-diode-pumped soft X-Ray laser.
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Phase coherent, injection-seeded table-top soft X-Ray Lasers at wavelengths down to 13.9 nm
2008 Conference on Lasers and Electro-Optics and 2008 Conference on Quantum Electronics and Laser Science, 2008Co-Authors: Y. Wang, D. Alessi, M. Berrill, F. Pedaci, B. Luther, E. Granados, J J RoccaAbstract:We have realized the first demonstration of soft X-Ray Lasers with essentially full spatial and temporal coherence at sub-20 nm wavelengths by high harmonic seeding of soft X-Ray plasma amplifiers created by irradiation of solid targets.
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phase coherent injection seeded table top soft X Ray Lasers at 18 9 nm and 13 9 nm
Nature Photonics, 2008Co-Authors: Y Wang, D. Alessi, M. Berrill, Bradley M. Luther, E. Granados, Francesco Pedaci, J J RoccaAbstract:There is keen interest in generating intense, coherent, soft-X-Ray beams for scientific and measurement applications1. Here, we report the demonstration of soft-X-Ray Lasers with essentially full spatial and temporal coherence operating at wavelengths below 20 nm, and in particular within the 13-nm spectral region, which is important for the manufacturing of computer chips using eXtreme uv lithography. Gain-saturated pulses were produced in dense laser-created plasmas by amplifying high-harmonic seed pulses in the 18.9-nm and 13.9-nm transitions of nickel-like molybdenum and silver ions, respectively. These results, obtained using an injection seeding technique that can also be applied to improve the temporal coherence of free-electron Lasers, eXtend our ability to generate bright phase-coherent laser beams to significantly shorter wavelengths. Moreover, the eXperiments were conducted using a practical table-top laser2. These compact soft-X-Ray Lasers offer new scientific opportunities, such as high-resolution coherent imaging and phase-coherent probing of atomic and molecular systems, in small laboratory environments.
V.n. Shlyaptsev - One of the best experts on this subject based on the ideXlab platform.
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High repetition rate collisional soft X-Ray Lasers based on grazing incidence pumping
IEEE Journal of Quantum Electronics, 2006Co-Authors: B. M. Luther, J J Rocca, R Keenan, J. Dunn, Y. Wang, D. Alessi, M. Berrill, M.a. Larotonda, V.n. ShlyaptsevAbstract:We discuss the demonstration of gain-saturated high repetition rate table-top soft X-Ray Lasers producing microwatt average powers at wavelengths ranging from 13.9 to 33 nm. The results were obtained heating a precreated plasma with a picosecond optical laser pulse impinging at grazing incidence onto a precreated plasma. This pumping geometry increases the energy deposition efficiency of the pump beam into the gain region, making it possible to saturate soft X-Ray Lasers in this wavelength range with a short pulse pump energy of only 1 J at 800-nm wavelength. Results corresponding to 5-Hz repetition rate operation of gain-saturated 14.7-nm Ni-like Pd and 32.6-nm line Ne-like Ti Lasers pumped by a table-top Ti:sapphire laser are reported. We also discuss results obtained using a 1 /spl omega/1054-nm prepulse and 2 /spl omega/527-nm short pulse from a Nd:glass pump laser. This work demonstrates the feasibility of producing compact high average power soft X-Ray Lasers for applications.
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demonstration of high repetition rate tabletop soft X Ray Lasers with saturated output at wavelengths down to 13 9 nm and gain down to 10 9 nm
Physical Review A, 2005Co-Authors: Y Wang, V.n. Shlyaptsev, D. Alessi, M. Berrill, M.a. Larotonda, Bradley M. Luther, J J RoccaAbstract:Saturated tabletop Lasers operating at 5 Hz repetition rate with average powers 1 W were demonstrated at wavelengths between 16.5 and 13.9 nm in the 4d 1 S 0 –4 p 1 P 1 transitions of Ni-like ions. The results were obtained using picosecond laser heating pulses with an energy of only 1 J by optimizing the angle of incidence for maXimum energy deposition. Lasing was also observed for shorter wavelength transitions of the same isoelectronic sequence, with amplification in the 11.9 nm line of Ni-like Sn approaching gain saturation, and progressively reduced gain for wavelengths as low as 10.9 nm for Ni-like Te. These high repetition rate soft X-Ray Lasers will enable new applications in science and the development of unique metrology and processing tools for industry.
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Gain saturated operation of table-top soft X-Ray Lasers in neon-like ions at 5 Hz repetition rate
2005 Quantum Electronics and Laser Science Conference, 2005Co-Authors: D. Alessi, J J Rocca, Y. Wang, B. M. Luther, M. Berrill, M.a. Larotonda, F. Pedaci, V.n. ShlyaptsevAbstract:We report the demonstration of gain saturated table-top soft X-Ray Lasers operating at 5 Hz repetition rate in Ne-like Ti at 32.6 nm and Ne-like V at 30.4 nm. Lasing was also observed in Ne-like Cr at 28.6 nm.
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Grazing Incidence Pumping for Efficient X-Ray Lasers
2004Co-Authors: James Dunn, R Keenan, P. K. Patel, Dwight Price, Raymond F. Smith, V.n. ShlyaptsevAbstract:We report progress in developing efficient pumping of laser-driven X-Ray Lasers that opens new possibilities for both high average power X-Ray Lasers as well as producing progressively shorter wavelength Lasers. The new scheme of grazing incidence pumping (GRIP) is described. In essence, a chosen electron density region of a pre-formed plasma column, produced by a longer pulse at normal incidence onto a slab target, is selectively pumped by focusing the short pulse {approX}ps laser at a determined grazing incidence angle to the target. The controlled use of refraction of the pumping laser in the plasma results in several benefits: The pump laser path length is longer and there is an increase in the laser absorption in the gain region for creating a collisional Ni-like ion X-Ray laser. There is also an inherent traveling wave, close to c, that increases the overall pumping efficiency. The scheme requires careful tailoring of the pump and plasma conditions to the specific X-Ray laser under investigation but the main advantage is a 3 - 30 times reduction in the laser pump energy for mid-Z materials. We report several eXamples of this new X-Ray laser on two different laser systems. The first demonstrates a 10 Hz X-Ray laser operating at 18.9 nm pumped with a total of 150 mJ of 800 nm wavelength from a Ti:Sapphire laser. The second case is shown where the COMET laser is used both at 527 nm and 1054 nm wavelength to pump higher Z materials with the goal of eXtending the wavelength regime of tabletop X-Ray Lasers below 10 nm.
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Analytical and numerical Ray tracing of X-Ray Lasers
2003Co-Authors: J Kuba, V.n. Shlyaptsev, D Benredjem, C MollerAbstract:Soft X-Ray Lasers in 10-30nm range are now routinely produced in hot plasmas generated either by a laser from a solid target or by an electrical discharge in a capillary. Such an X-Ray laser is a convenient tool for future applications, such as probing dense plasmas of interest for fusion eXperiments. Their short wavelength enables plasma diagnosis beyond the capabilities of optical Lasers, because the high critical plasma density ({approX}{lambda}{sup 2}) limits the optical beam propagation. In our paper, we present analytical and numerical Ray tracing of an X-Ray laser in dense amplifying plasmas. A general analytical formula for a beam propagation has been developed for a gradient plasma. The simplified analytical formulaes enable better understanding of processes involved. They also simplify optimization of the beam propagation and ''mapping'' the parameter space for further studies by numerical codes. We discuss implications for a transient X-Ray laser that is produced from a slab target by a (sub-)picosecond laser pulse.
J. Dunn - One of the best experts on this subject based on the ideXlab platform.
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continuous high repetition rate operation of collisional soft X Ray Lasers with solid targets
Optics Letters, 2006Co-Authors: A Weith, J J Rocca, D. Alessi, B. M. Luther, M.a. Larotonda, Y Wang, M C Marconi, J. DunnAbstract:We have generated a laser average output power of 2 μW at a wavelength of 13.9 nm by operating a tabletop laser-pumped Ni-like Ag laser at a 5 Hz repetition rate, using a solid helicoidal target that is continuously rotated and advanced to renew the target surface between shots. More than 2×104 soft-X-Ray laser shots were obtained by using a single target. Similar results were obtained at 13.2 nm in Ni-like Cd with a Cd-coated target. This scheme will allow uninterrupted operation of laser-pumped tabletop collisional soft-X-Ray Lasers at a repetition rate of 10 Hz for a period of hours, enabling the generation of continuous high average soft-X-Ray powers for applications.
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High repetition rate collisional soft X-Ray Lasers based on grazing incidence pumping
IEEE Journal of Quantum Electronics, 2006Co-Authors: B. M. Luther, J J Rocca, R Keenan, J. Dunn, Y. Wang, D. Alessi, M. Berrill, M.a. Larotonda, V.n. ShlyaptsevAbstract:We discuss the demonstration of gain-saturated high repetition rate table-top soft X-Ray Lasers producing microwatt average powers at wavelengths ranging from 13.9 to 33 nm. The results were obtained heating a precreated plasma with a picosecond optical laser pulse impinging at grazing incidence onto a precreated plasma. This pumping geometry increases the energy deposition efficiency of the pump beam into the gain region, making it possible to saturate soft X-Ray Lasers in this wavelength range with a short pulse pump energy of only 1 J at 800-nm wavelength. Results corresponding to 5-Hz repetition rate operation of gain-saturated 14.7-nm Ni-like Pd and 32.6-nm line Ne-like Ti Lasers pumped by a table-top Ti:sapphire laser are reported. We also discuss results obtained using a 1 /spl omega/1054-nm prepulse and 2 /spl omega/527-nm short pulse from a Nd:glass pump laser. This work demonstrates the feasibility of producing compact high average power soft X-Ray Lasers for applications.
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efficient pumping schemes for high average brightness collisional X Ray Lasers
Optical Science and Technology SPIE's 48th Annual Meeting, 2003Co-Authors: R Keenan, Vyacheslav N. Shlyaptsev, R F Smith, J. Dunn, P. K. Patel, D PriceAbstract:Advances in transient collisional X-Ray Lasers have been demonstrated over the last 5 years as a technique for achieving tabletop soft X-Ray Lasers using 2-10 J of laser pump energy. The high peak brightness of these sources operating in the high output saturation regime, in the range of 10{sup 24}-10{sup 25} ph. mm{sup -2} mrad{sup -2} s-1 (0.1% BW){sup -1}, is ideal for many applications requiring high photon fluence in a single short burst. However, the pump energy required for these X-Ray Lasers is still relatively high and limits the X-Ray laser repetition rate to 1 shot every few minutes. Higher repetition rate collisional schemes have been reported and show some promise for high output in the future. We report a novel technique for enhancing the coupling efficiency of the laser pump into the gain medium that could lead to enhanced X-Ray inversion with a factor of ten reduction in the drive energy. This has been applied to the collisional eXcitation scheme for Ni-like Mo at 18.9 nm and X-Ray laser output has been demonstrated. Preliminary results show lasing on a single shot of the optical laser operating at 10 Hz and with 70 mJ in the short pulse. Suchmore » a proposed source would have higher average brightness, {approX}10{sup 14} ph. mm{sup -2} mrad{sup -2} s{sup -1} (0.1% BW){sup -1}, than present bending magnet 3rd generation synchrotron sources operating at the same spectral range.« less
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gain saturation regime for laser driven tabletop transient ni like ion X Ray Lasers
Physical Review Letters, 2000Co-Authors: J. Dunn, A.l. Osterheld, J. Nilsen, Yuelin Li, J R Hunter, V.n. ShlyaptsevAbstract:We have demonstrated small signal gain saturation on several transient-gain Ni-like ion X-Ray Lasers by using a high-power, chirped-pulse amplification, tabletop laser. These results have been achieved at wavelengths from 139-203 Angstrom using a total of 5-7 J energy in a traveling-wave eXcitation scheme. Strong amplification is also observed for Ni-like Sn at 119 Angstrom. Gain of 62 cm{sup -1} and gL product of 18 are determined on the 4d{yields}4p transition for Ni-like Pd at 147 Angstrom with an output energy of 12 {mu}J . A systematic evaluation of the laser driver parameters yields optimum beam divergence and small deflection angles of 2-5 mrads, in good agreement with simulations. (c) 2000 The American Physical Society.
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High gain table-top transient collisional X-Ray Lasers
IEEE Conference Record - Abstracts. 1999 IEEE International Conference on Plasma Science. 26th IEEE International Conference (Cat. No.99CH36297), 1999Co-Authors: J. Dunn, A.l. Osterheld, J. Nilsen, Yuelin Li, V.n. ShlyaptsevAbstract:Summary form only given, as follows. In the last few years, there has been rapid progress in the development of higher efficiency laser-pumped X-Ray Lasers which has led to a significant reduction in the energy required to produce a population inversion. At LLNL, we are continuing research on table-top transient collisional eXcitation schemes generated by high power (15 TW), 500 fs pulses from the COMET laser. Strong lasing has been demonstrated on various Ne-like and Ni-like ion X-Ray Lasers operating in the 130-320 /spl Aring/ range using typically 5-10 J of laser energy on target. Ultra high gains up to 55/cm have been observed allowing the possibility of achieving gain saturation and X-Ray laser output energy of 1-10 /spl mu/J with target lengths of a few millimeters. Recent eXperiments show enhanced output of the X-Ray laser when the short laser pulse irradiates the target in a traveling wave geometry. The high gain region in the plasma has been determined using multi-layer coated optics imaging and is compared with simulations to better understand the generation of the transient X-Ray laser.
M. Berrill - One of the best experts on this subject based on the ideXlab platform.
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high average power 100 hz repetition rate tabletop soft X Ray Lasers at sub 15 nm wavelengths
Physical Review A, 2014Co-Authors: Brendan A. Reagan, M. Berrill, Keith A Wernsing, Cory Baumgarten, Mark Woolston, J J RoccaAbstract:Efficient eXcitation of dense plasma columns at 100-Hz repetition rate using a tailored pump pulse profile produced a tabletop soft-X-Ray laser average power of 0.1 mW at = 13.9 nm and 20 W at = 11.9 nm from transitions of Ni-like Ag and Ni-like Sn, respectively. Lasing on several other transitions with wavelengths between 10.9 and 14.7 nm was also obtained using 0.9-J pump pulses of 5-ps duration from a compact diode-pumped chirped pulse amplification Yb:YAG laser. Hydrodynamic and atomic plasma simulations show that the pump pulse profile, consisting of a nanosecond ramp followed by two peaks of picosecond duration, creates a plasma with an increased density of Ni-like ions at the time of peak temperature that results in a larger gain coefficient over a temporally and spatially enlarged space leading to a threefold increase in the soft-X-Ray laser output pulse energy. The high average power of these compact soft-X-Ray Lasers will enable applications requiring high photon fluX. These results open the path to milliwatt-average-power tabletop soft-X-Ray Lasers.
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Advances in compact high repetition rate soft X-Ray Lasers
2010 23rd Annual Meeting of the IEEE Photonics Society, 2010Co-Authors: J J Rocca, B. A. Reagan, F. J. Furch, Y. Wang, D. Alessi, D. Martz, B. M. Luther, M. Berrill, A. H. CurtisAbstract:We review recent progress in the development of table-top soft X-Ray Lasers that includes the demonstration of a gain-saturated λ = 10.9 nm laser, and the first demonstration of an all-diode-pumped soft X-Ray laser.
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Phase coherent, injection-seeded table-top soft X-Ray Lasers at wavelengths down to 13.9 nm
2008 Conference on Lasers and Electro-Optics and 2008 Conference on Quantum Electronics and Laser Science, 2008Co-Authors: Y. Wang, D. Alessi, M. Berrill, F. Pedaci, B. Luther, E. Granados, J J RoccaAbstract:We have realized the first demonstration of soft X-Ray Lasers with essentially full spatial and temporal coherence at sub-20 nm wavelengths by high harmonic seeding of soft X-Ray plasma amplifiers created by irradiation of solid targets.
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phase coherent injection seeded table top soft X Ray Lasers at 18 9 nm and 13 9 nm
Nature Photonics, 2008Co-Authors: Y Wang, D. Alessi, M. Berrill, Bradley M. Luther, E. Granados, Francesco Pedaci, J J RoccaAbstract:There is keen interest in generating intense, coherent, soft-X-Ray beams for scientific and measurement applications1. Here, we report the demonstration of soft-X-Ray Lasers with essentially full spatial and temporal coherence operating at wavelengths below 20 nm, and in particular within the 13-nm spectral region, which is important for the manufacturing of computer chips using eXtreme uv lithography. Gain-saturated pulses were produced in dense laser-created plasmas by amplifying high-harmonic seed pulses in the 18.9-nm and 13.9-nm transitions of nickel-like molybdenum and silver ions, respectively. These results, obtained using an injection seeding technique that can also be applied to improve the temporal coherence of free-electron Lasers, eXtend our ability to generate bright phase-coherent laser beams to significantly shorter wavelengths. Moreover, the eXperiments were conducted using a practical table-top laser2. These compact soft-X-Ray Lasers offer new scientific opportunities, such as high-resolution coherent imaging and phase-coherent probing of atomic and molecular systems, in small laboratory environments.
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High repetition rate collisional soft X-Ray Lasers based on grazing incidence pumping
IEEE Journal of Quantum Electronics, 2006Co-Authors: B. M. Luther, J J Rocca, R Keenan, J. Dunn, Y. Wang, D. Alessi, M. Berrill, M.a. Larotonda, V.n. ShlyaptsevAbstract:We discuss the demonstration of gain-saturated high repetition rate table-top soft X-Ray Lasers producing microwatt average powers at wavelengths ranging from 13.9 to 33 nm. The results were obtained heating a precreated plasma with a picosecond optical laser pulse impinging at grazing incidence onto a precreated plasma. This pumping geometry increases the energy deposition efficiency of the pump beam into the gain region, making it possible to saturate soft X-Ray Lasers in this wavelength range with a short pulse pump energy of only 1 J at 800-nm wavelength. Results corresponding to 5-Hz repetition rate operation of gain-saturated 14.7-nm Ni-like Pd and 32.6-nm line Ne-like Ti Lasers pumped by a table-top Ti:sapphire laser are reported. We also discuss results obtained using a 1 /spl omega/1054-nm prepulse and 2 /spl omega/527-nm short pulse from a Nd:glass pump laser. This work demonstrates the feasibility of producing compact high average power soft X-Ray Lasers for applications.
D. Alessi - One of the best experts on this subject based on the ideXlab platform.
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Advances in compact high repetition rate soft X-Ray Lasers
2010 23rd Annual Meeting of the IEEE Photonics Society, 2010Co-Authors: J J Rocca, B. A. Reagan, F. J. Furch, Y. Wang, D. Alessi, D. Martz, B. M. Luther, M. Berrill, A. H. CurtisAbstract:We review recent progress in the development of table-top soft X-Ray Lasers that includes the demonstration of a gain-saturated λ = 10.9 nm laser, and the first demonstration of an all-diode-pumped soft X-Ray laser.
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Phase coherent, injection-seeded table-top soft X-Ray Lasers at wavelengths down to 13.9 nm
2008 Conference on Lasers and Electro-Optics and 2008 Conference on Quantum Electronics and Laser Science, 2008Co-Authors: Y. Wang, D. Alessi, M. Berrill, F. Pedaci, B. Luther, E. Granados, J J RoccaAbstract:We have realized the first demonstration of soft X-Ray Lasers with essentially full spatial and temporal coherence at sub-20 nm wavelengths by high harmonic seeding of soft X-Ray plasma amplifiers created by irradiation of solid targets.
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phase coherent injection seeded table top soft X Ray Lasers at 18 9 nm and 13 9 nm
Nature Photonics, 2008Co-Authors: Y Wang, D. Alessi, M. Berrill, Bradley M. Luther, E. Granados, Francesco Pedaci, J J RoccaAbstract:There is keen interest in generating intense, coherent, soft-X-Ray beams for scientific and measurement applications1. Here, we report the demonstration of soft-X-Ray Lasers with essentially full spatial and temporal coherence operating at wavelengths below 20 nm, and in particular within the 13-nm spectral region, which is important for the manufacturing of computer chips using eXtreme uv lithography. Gain-saturated pulses were produced in dense laser-created plasmas by amplifying high-harmonic seed pulses in the 18.9-nm and 13.9-nm transitions of nickel-like molybdenum and silver ions, respectively. These results, obtained using an injection seeding technique that can also be applied to improve the temporal coherence of free-electron Lasers, eXtend our ability to generate bright phase-coherent laser beams to significantly shorter wavelengths. Moreover, the eXperiments were conducted using a practical table-top laser2. These compact soft-X-Ray Lasers offer new scientific opportunities, such as high-resolution coherent imaging and phase-coherent probing of atomic and molecular systems, in small laboratory environments.
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continuous high repetition rate operation of collisional soft X Ray Lasers with solid targets
Optics Letters, 2006Co-Authors: A Weith, J J Rocca, D. Alessi, B. M. Luther, M.a. Larotonda, Y Wang, M C Marconi, J. DunnAbstract:We have generated a laser average output power of 2 μW at a wavelength of 13.9 nm by operating a tabletop laser-pumped Ni-like Ag laser at a 5 Hz repetition rate, using a solid helicoidal target that is continuously rotated and advanced to renew the target surface between shots. More than 2×104 soft-X-Ray laser shots were obtained by using a single target. Similar results were obtained at 13.2 nm in Ni-like Cd with a Cd-coated target. This scheme will allow uninterrupted operation of laser-pumped tabletop collisional soft-X-Ray Lasers at a repetition rate of 10 Hz for a period of hours, enabling the generation of continuous high average soft-X-Ray powers for applications.
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High repetition rate collisional soft X-Ray Lasers based on grazing incidence pumping
IEEE Journal of Quantum Electronics, 2006Co-Authors: B. M. Luther, J J Rocca, R Keenan, J. Dunn, Y. Wang, D. Alessi, M. Berrill, M.a. Larotonda, V.n. ShlyaptsevAbstract:We discuss the demonstration of gain-saturated high repetition rate table-top soft X-Ray Lasers producing microwatt average powers at wavelengths ranging from 13.9 to 33 nm. The results were obtained heating a precreated plasma with a picosecond optical laser pulse impinging at grazing incidence onto a precreated plasma. This pumping geometry increases the energy deposition efficiency of the pump beam into the gain region, making it possible to saturate soft X-Ray Lasers in this wavelength range with a short pulse pump energy of only 1 J at 800-nm wavelength. Results corresponding to 5-Hz repetition rate operation of gain-saturated 14.7-nm Ni-like Pd and 32.6-nm line Ne-like Ti Lasers pumped by a table-top Ti:sapphire laser are reported. We also discuss results obtained using a 1 /spl omega/1054-nm prepulse and 2 /spl omega/527-nm short pulse from a Nd:glass pump laser. This work demonstrates the feasibility of producing compact high average power soft X-Ray Lasers for applications.
