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Phase-locked arrays of vertical-cavity surface-emitting lasers

Description: Vertical Cavity Surface-Emitting Lasers (VCSELs) are of increasing interest to the photonics community because of their surface-emitting structure, simple fabrication and packaging, wafer-level testability and potential for low cost. Scaling VCSELs to higher power outputs requires increasing the device area, which leads to transverse mode control difficulties if devices become larger than 10-15 microns. One approach to increasing the device size while maintaining a well controlled transverse mo… more
Date: May 1, 1994
Creator: Warren, M. E.; Hadley, G. R.; Lear, K. L.; Gourley, P. L.; Vawter, G. A.; Zolper, J. C. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A reliable low-maintenance flashlamp-pumped Ti:sapphire laser operating at 120 PPS

Description: Flashlamp-pumped Ti:sapphire lasers have been reported to produce high-energy pulses with broad tunability. However, with the flashlamps operated close to their explosion energy, and thermal loading effects in the laser rod, these lasers were restricted to low repetition rates (typically around 10 PPS). Higher repetition rates at constant laser pulse energy reduce the flashlamp lifetime drastically. The author reports on a reliable flashlamp-pumped Ti:sapphire laser that has been operating at 1… more
Date: March 1, 1994
Creator: Witte, K. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A two-photon fluorescence autocorrelator for a Nd:YLF modelocked laser

Description: In this thesis, I discuss the design and implementation of an autocorrelator for an actively modelocked ND:YLF laser at wavelength 1.054{mu}m. A dye is used to generate a broadband two-photon fluorescence (TPF) signal at 570nm which is the autocorrelation of the laser pulses. Two different techniques are discussed. A colliding pulse scheme can be used to generate a TPF autocorrelation signal as a function of distance, or an interferometer technique can be used to generate an autocorrelation sig… more
Date: May 1, 1991
Creator: Kner, Peter Alexander
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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Performance improvements in diode laser arrays

Description: The average power performance capability of semiconductor laser diode arrays has improved dramatically over the past several years. Additionally, optical conditioning technologies have been developed that increase the effective radiance of stacked two-dimensional arrays by nearly two orders of magnitude. These performance improvements have been accompanied by cost reductions that now make feasible the replacement of flashlamp pump sources by laser diode arrays in a large variety of military and… more
Date: June 1, 1994
Creator: Beach, R. J.; Emanuel, M. A.; Freitas, B. L.; Benett, W. J.; Skidmore, J. A.; Carlson, N. W. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Improved performance 1590 nm Er:YLF laser

Description: We present an improvement in the performance of a 1590 nm ER:YLF laser through simultaneous laser operation at 2717 nm. A slope efficiency of 7.0% with an output of 13.2 mW has been achieved with 971 nm pumping.
Date: December 1, 1994
Creator: Marchbanks, R. D.; Petrin, R. R. & Cockroft, N. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Semiconductor diode laser having an intracavity spatial phase controller for beam control and switching

Description: A high-power broad-area semiconductor laser having a intracavity spatial phase controller is disclosed. The integrated intracavity spatial phase controller is easily formed by patterning an electrical contact metallization layer when fabricating the semiconductor laser. This spatial phase controller changes the normally broad far-field emission bean, of such a laser into a single-lobed near-diffraction-limited beam at pulsed output powers of over 400 mW. Two operating modes, a thermal and a gai… more
Date: December 31, 1992
Creator: Hohimer, J. P.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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Transient radiation-induced absorption in materials for the DOI laser

Description: This is the final report on a series of experiments concerned with transient radiation-induced absorption in materials for a Cr,Nd:GSGG laser. Both the Sandia National Laboratories SPR III pulsed reactor and the Hermes III pulsed X-ray machine are used as radiation sources. The time dependence and the magnitude of the induced absorption in filter glasses and in doped and undoped LiNbO{sub 3} Q-switch materials have been measured. Gain has been observed in Cr,Nd:GSGG, the laser medium, when it i… more
Date: January 1, 1995
Creator: Brannon, P. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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250 watt average power electro-quality Q-switched diode pumped power oscillator

Description: We describe an electro-optically Q-switched, diode-pumped ND:YAG slab laser oscillator operating at an average power of greater than 250 watts. More than 100 watts of frequency doubled light has been demonstrated.
Date: April 1, 1994
Creator: Velsko, S. P.; Ebbers, C. A.; Comaskey, B.; Albrecht, G. F. & Mitchell, S. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Enhanced output of soft X-ray lasers using double slab targets

Description: Double slab neon-like niobium soft x-ray laser experiments have been performed using the Nova laser. The two slabs have their front surfaces facing in opposite directions with either a 300 {mu}m planar separation between them. Separate laser beams irradiate each slab with an intensity on target of 1.3 {times} 10{sup 14} W/cm{sup 2}. Best coupling was observed using a 300 {mu}m separation. The angular divergence of the laser is measured for single slab and double slab configurations. Comparisons… more
Date: June 1, 1994
Creator: Moreno, J. C.; Nilsen, J. & Chandler, E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Diode array alternative to paint removal solid-state cw laser

Description: The purpose of this memo is to highlight an alternative to the approach for cw laser paint removal. The point to be made is that a direct diode design is feasible and can be far more competitive than a solid-state laser based system. Through by-passing the use of a solid-state laser media, we immediately gain a factor of about five in system efficiency based on measured optical-to-optical efficiencies of our average power diode pumped lasers. This permits a massive reduction in system cooling r… more
Date: December 29, 1993
Creator: Comaskey, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Trident as an ultrahigh irradiance laser

Description: The Trident Nd:glass ICF laser at Los Alamos may be operated in a mode that produces high ultrashort pulses by the chirp/compression method. The 125-ps pulses from a standard moderated, ND:YLF oscillator are first frequency-broadened to 3-nm bandwidth, chirped in a quartz fiber, and then compressed with a grating pair to 1.5 ps. A second quartz fiber then provides nonlinear polarization rotation for background and satellite suppression and to further broaden the spectrum to >7 nm. Pulses are ch… more
Date: February 1, 1995
Creator: Johnson, R. P.; Moncur, N. K.; Cobble, J. A.; Watt, R. G. & Gibson, R. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Overview of laser technology at Los Alamos National Laboratory

Description: Los Alamos National Laboratory has had a long history of involvement in laser sciences and has been recognized both for its large laser programs and smaller scale developments in laser technology and applications. The first significant program was with the Rover nuclear-based rocket propulsion system in 1968 to study laser initiated fusion. From here applications spread to programs in laser isotope separation and development of large lasers for fusion. These programs established the technologic… more
Date: September 1, 1994
Creator: Lewis, G. K. & Cremers, D. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A high power microwave frequency modulated KrF laser

Description: The authors report on the development of a 260mJ 248 nm KrF laser with 98.7% depth of modulation at 1.3 GHz and 77% depth of modulation at 2.6 GHz using a 1.3 GHz microwave source driving a Pockel`s cell. Subsequent single-pass amplification of the modulated KrF source to the 1/4-joule level is shown to be straight forward with no noticeable degradation of the modulation depth.
Date: April 1, 1994
Creator: Sze, R. C.; McCown, A. & Kurnit, N. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

U-turn alternative to the large aperture switch

Description: The primary alternative laser architecture is the U-turn design. The U-turn has significantly different cost and performance risks than the full-aperture switch, which makes it a highly desirable alternative. The U-turn was conceived at LLNL in 1992. A similar concept, the L-turn had already been discovered by the French at CEL-V. Both concepts are based on the multipass glass amplifier design, but the full-aperture Pockels cell and polarizer are replaced with smaller and less expensive optics.… more
Date: March 9, 1994
Creator: Vann, C. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Multi-terrawatt, 100 fsec laser system using flashlamp-pumped, dye- converted Ti:Sapphire as an amplifier

Description: We report on amplification of 100 fsec laser pulses to 250 mJ using flashlamp-pumped, dye converted Ti:Sapphire. The resulting 5 Hz beam is focused to irradiances in excess of 5 {times} 10{sup 18} W/cm{sup 2}.
Date: April 14, 1993
Creator: White, W. E.; Reitize, D. H.; Price, D. F.; Shepherd, R. L.; Bonlie, J. D.; Hunter, J. R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Intracavity flux dependent absorption in e-beam pumped KrF

Description: Transient absorption measurements are performed on e-beam excited KrF under lasing and nonlasing conditions for 10% Kr (Ar diluent) and 99.6% Kr gas mixtures. The intracavity flux is varied by changing the output mirror reflectivity. The deposition rate for this experiment is {approx}396 kW/cm{sup 3}. For the 10% Kr and Kr-rich mixtures, the small signal absorption at 248.4 nm is 0.76%/cm and 1.25%/cm, respectively; while the nonsaturable absorption in 0.62%/cm and 0.90%/cm, respectively. A flu… more
Date: December 31, 1988
Creator: Seamans, J. F.; Kimura, W. D. & Hanson, D. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Photopumped x-ray laser research on Saturn

Description: Using Saturn as a driver, we are pursuing both photoresonantly pumped and photoionization/recombination lasers. Our lasing targets are gas cells with thin windows that are pumped by a z pinch 2 cm away radiating 10 TW. In both schemes the lasant and gas fill is neon. We will present evidence for inversion in the sodium/neon photoresonant scheme but we have yet to detect the lasing transition itself. To increase our chances of measuring this line we have introduced potassium into a sodium z-pinc… more
Date: August 1, 1993
Creator: Nash, T. J.; Spielman, R. B.; Vargas, M. & Ruggles, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Microchannel heatsinks for high average power laser diode arrays

Description: Detailed performance results and fabrication techniques for an efficient and low thermal impedance laser diode array heatsink are presented. High duty factor or even CW operation of fully filled laser diode arrays is enabled at high average power. Low thermal impedance is achieved using a liquid coolant and laminar flow through microchannels. The microchannels are fabricated in silicon using a photolithographic pattern definition procedure followed by anisotropic chemical etching. A modular rac… more
Date: January 1, 1992
Creator: Beach, R.; Benett, B.; Freitas, B.; Ciarlo, D.; Sperry, V.; Comaskey, B. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Performance of cesium telluride photocathodes as an electron source for the Los Alamos FEL

Description: The Los Alamos Advanced FEL was successfully operated with a Cs{sub 2}Te photocathode driven by a frequency quadrupled Nd:YLF laser as the electron source. Lasing was achieved at 5-6 microns. Cs{sub 2}Te photocathodes with quantum efficiencies of 12-18% at 254 nm were fabricated in an ultrahigh-vacuum chamber and transferred under high vacuum to the FEL. 263 mn light from the drive laser was focused to an 8 mm spot on the center of the photocathode. The authors estimated the operational life ti… more
Date: September 1, 1994
Creator: Kong, S. H.; Kinross-Wright, J.; Nuguyen, D. C.; Sheffield, R. L. & Weber, M. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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