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in subjects: "Lasers"

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Design for a Variable-Output-Coupling Far-Infrared Michelson Laser

Technique for varying the coupling of power from far-infrared gas lasers and the design and construction of these lasers.

Date: January 1971

Creator: Wells, J. S.; Evenson, K. M.; Matarrese, L. M.; Jennings, D. A. & Wichman, G. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Layered target burnthrough experiments using 50 nsec KrF laser pulses

Experiments have been performed on two types of planar layered targets using the Sprite KrF laser. The targets lused were: (1) 0.25 to 3.0 microns of Al deposited on an SiO/sub 2/ substrate and (2) 0.25 to 3.0 microns of CH (parylene-N) deposited on 0.20 microns of Al on an SiO/sub 2/ substrate. The laser was characterized by a pulse length of 50 nsec FWHM, an intensity of 2 x 10/sup 10/ watts/cm/sup 2/ and a wavelength of 248.5 nm. A filtered photoiodide and a streak camera, each operating in … more

Date: January 1, 1986

Creator: Kephart, J. F.; Dingus, R. S.; Gitomer, S. J.; Kopp, R. A. & Shaw, M. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Polymeric-host sulforhodamine-B lasers: Doubled Nd:YAG pumped

Solid-state dye lasers, pumped by a doubled Nd:YAG laser, were evaluated as a function of concentration, output coupler reflectivity and oscillator dimensions. A slope efficiency of up to 62% was achieved. A maximum irradiance of 59 MW/cm{sup 2} to the dye laser cavity was achieved. 7 refs., 2 figs., 4 tabs.

Date: January 1, 1991

Creator: Gettemy, D.J.; Hermes, R.E. (Los Alamos National Lab., NM (USA)) & Barnes, N.P. (National Aeronautics and Space Administration, Hampton, VA (USA). Langley Research Center)

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High average power excimer laser-pumped dye oscillators

The design, construction, and testing of a high-average-power excimer laser-pumped dye oscillator is described. The system is designed to produce up to 75 watts of average power in the near uv at a pulse repetition rate of 500 Hz. 8 figs.

Date: January 1, 1988

Creator: Tennant, R.A.; Whitehead, M.C.; Tallman, C.R. & Basinger, R.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Overview of recent advances in excimer laser technology at Los Alamos

From among the areas of excimer laser development at Los Alamos two are selected for further discussion: ultra-high brightness excimer laser systems and discharge-pumped XeF(C..-->..A) lasers operating in the blue-green portion of the spectrum. Two different high brightness systems are described. One is based on small-aperture KrF amplifiers, while the other is based on a large-aperture XeCl amplifier. The XeF(C..-->..A) laser is tunable from 435 to 525 nm, and may one day become a viable alter… more

Date: January 1, 1988

Creator: Bigio, I. J.; Sze, R. C.; Taylor, A. J. & Gibson, R. B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Stable 1 --> 0 carbon monoxide laser

A stable carbon monoxide laser capable of oscillation on transitions in the fundamental 1 ..-->.. 0 band is described. This laser is also capable of a quasi-continuous tunability in the range of 4.7 to 8 microns.

Date: July 1, 1978

Creator: Gerlach, R. & Amer, N.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Review of long-pulse laser development

A brief review of some present techniques to obtain long-pulse laser action in excimer discharge devices will be presented. An attempt will be made to point out the strengths and weaknesses of these techniques. 18 refs., 15 figs.

Date: January 1, 1989

Creator: Sze, R.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Scalable nanosecond CO/sub 2/ laser technology. Progress report for period November 7, 1976--January 7, 1977

This second bi-monthly progress report on the Scalable Nanosecond CO/sub 2/ Laser Technology Program covers work performed from November 8, 1976 to January 7, 1977. Under Task I - Saturable Absorber Studies, small signal absorption measurements over the 9 and 10 ..mu.. bands were carried out on various molecules to determine their potential as gain isolators. Saturation and relaxation experiments are being set-up to further evaluate some of these absorber media. Continued modeling and theoretic… more

Date: February 1, 1977

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Simultaneous determination of gain parameters in steady state lasers

The optical gain parameters of pulsed steady-state lasers, such as dye and excimer lasers, are determined from a single set of experiments from either a laser oscillator or an amplifier. The gain parameters determined by this technique are the small-signal gain coefficient, the saturation intensity for stimulated emission, the saturation fluence for stimulated emission, and the non-saturable absorption coefficient. The measured saturation properties of laser amplifiers and oscillators are used … more

Date: January 1, 1993

Creator: Jensen, C. C.; Branning, D. A. & Marchbanks, R. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Overview of the program on soft x-ray lasers and their applications at Princeton

In the last several years, rapid progress in the development of soft x-ray lasers (SXL) has been observed at a number of laboratories worldwide. Although SXLs are very young'' devices they have already been used for microscopy and holography, and new ideas emerging for broader application of SXLs to microscopy, holography and lithography. This paper describes the work at Princeton University on the development of a soft x-ray imaging transmission microscopy using a SXL as a radiation source and… more

Date: May 1, 1991

Creator: Suckewer, S. & Ilcisin, K. (Princeton Univ., NJ (USA). Plasma Physics Lab. Princeton Univ., NJ (USA). Dept. of Mechanical and Aerospace Engineering)

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Laser working group

The laser working group considered options to deliver synchronized laser pulses of the required energy to the photocathode and laser triggered switches. These requirements actually decreased during the course of the workshop, and the values finally settled upon (<10 J in 100 fs at /approximately/250 nm for the photocathode and /approximately/10 mJ in 2 ps near either 250 nm or 1 m for the switches) were considered to be well within the state of the art. Some development work may be required, ho… more

Date: January 1, 1988

Creator: Bigio, I.J.; Kurnit, N.A.; Donaldson, W.R.; Geissler, K. & Srinivasan-Rao, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Far infrared chemical lasers. Technical progress report No. 5, September 1, 1978-August 31, 1979

The intention to use the optically-pumped water vapor laser to study energy absorption and transfer in this triatomic molecule was not realized. The system at this moment is not well-enough understood to be as useful as was originally anticipated. What is known is that laser action in the far infrared is the result of flash-pumping, through suprasil, water vapor in the 10-100 mtorr pressure range, in a large resonator. About ten lines at about 100-200 cm/sup -1/ have been found. Four of them ve… more

Date: January 1, 1979

Creator: Robinson, Dean W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Narrow band tuning with small long pulse excimer lasers

We discuss frequency narrowing and tuning with simple dispersion elements with small long-pulse excimer lasers. The improved performance over short-pulse lasers is discussed and attributed to the increased number of round trips. A physical model of the dynamics of line narrowing is presented.

Date: December 1, 1985

Creator: Sze, R.C.; Kurnit, N.; Watkins, D. & Bigio, I.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Long-pulse excimer lasers for materials processing and medical applications

Present day commercial excimer lasers with the exception of the Helionetics device are inherently short pulse ultraviolet sources. The pulses are short due to the inherent instability of the avalanche discharge with electronegative elements in the gas mix. The utilization of an initial fast voltage risetime allows one to overcome this difficulty and a number of long-pulse lasers are built using this technique. While the initial lasers of this form used a series rail-gap to achieve the fast volt… more

Date: January 1, 1986

Creator: Sze, R.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High-repetition rate, inductively stabilized, long-pulse excimer laser

A high-repetition rate double discharge head laser is developed taking advantage of the increased pulse repetition rate capabilities of inductive stabilization.

Date: January 1, 1984

Creator: Sze, R.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Nonlinear dynamics of broad-band lasers

Significant progress has been made in several areas. The source of mode-intensity fluctuations in a three-mirror, multimode dye laser has been identified in the typical operating regime well above threshold. It was found experimentally that deterministic four-wave mixing interactions are the underlying cause. We have also made new theoretical studies concerning the regime just above threshold and predicted that the mode fluctuations will be dominated by quantum noise in this regime. We have con… more

Date: February 1, 1990

Creator: Raymer, Michael G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Laser-based instrumentation for detection of chemical-warfare agents

Several laser-based techniques are being developed for remote, point, and surface contamination detection of chemical warfare agents. These techniques include optoacoustic spectroscopy, laser-induced breakdown spectroscopy, and synchronous detection of laser-induced fluorescence. Detection limits in the part-per-million to part-per-billion regime have been demonstrated.

Date: January 1, 1981

Creator: Quigley, G. P.; Radziemski, L. J.; Sander, R. K. & Hartford Jr., A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Beam-quality measurements for materials processing lasers and the proposed ISO standard

Laser beam-quality can indicate the maximum power density that can be obtained with a specific laser and serves as a figure-of-merit when comparing lasers, calibrating lasers, and in assessing a laser`s operating condition. Measurements of laser beam-quality for a 1000 watt continuous wave CO{sub 2} laser and a 400 watt pulsed Nd:YAG laser have been completed. These measurements were made with two different type instruments: (1) a specially constructed apparatus that uses an integrating sphere … more

Date: November 1, 1993

Creator: Fuerschbach, P. W. & Essien, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A high-power picosecond Nd:YAG/CO{sub 2} laser system for electron guns, laser acceleration and FEL

Fourth-harmonic Nd:YAG pulses illuminating a microwave linear accelerator`s photoinjector generates electron bunches in trains for FEL experiments, or in a single pulse for laser acceleration. A multi-gigawatt CO{sub 2} laser switched by the ND:YAG fundamental delivers 50-ps pulses for Inverse Cherenkov, Inverse FEL, or Grating Linac electron acceleration experiments.

Date: December 31, 1994

Creator: Babzien, M.; Ben-Zvi, Ilan; Fisher, A. S.; Kusche, K.; Pogorelsky, I. V. & Srinivasan-Rao, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Expansion cooled CO nuclear pumped laser

A series of experiments are proposed to investigate the performance of a fission fragment excited CO laser which utilizes gas dynamic cooling. These experiments will utilize a wall source of fission fragments to provide excitation of CO or CO gas mixtures. A separate investigation will study the effects on the vibrational excitation distribution of CO or CO on gas mixtures with the addition of UF/sub 6/.

Date: January 1, 1978

Creator: Davis, John F.; Bird, Paul F.; Mansfield, Charles R. & Helmick, Herbert H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Full color laser television

Television image display using red, green, and blue solid state lasers is discussed.

Date: January 19, 2000

Creator: Fox, Brian E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Development of a Thulium Fiber Laser for an Atomic Spectroscopy Experiment

This article is a simplified analysis of a convenient thulium fiber laser source with 3 W of output power operating at a wavelength of 2059 nm with a slope efficiency of 49% with respect to input pump power and 60% with respect to absorbed pump power. The laser was applied in an atomic helium spectroscopy experiment to quench ³He (2058.63 nm) and ⁴He (2058.69 nm) meta-stable singlets (2¹S0), allowing for further investigation of the helium fine structure.

Date: February 15, 2020

Creator: Currey, Ronnie; Khademian, Ali & Shiner, David

Item Type: Article

Partner: UNT College of Science

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X rays generated in the interaction of subpicosecond laser pulses with solid targets

We are investigating the generation of short pulse short wavelength x-rays for pumping inner-shell x-ray lasers by photo-ionization. In contrast with previous proposals, we are looking at the use of a single line as an efficient means of pumping these lasers. As a first step we are optimizing the flashlamp x-ray conversion efficiency and characterizing the x-ray pulse length. 18 refs., 5 figs., 2 tabs.

Date: January 1, 1991

Creator: Kyrala, G. A.; Wahlin, E. K.; Fulton, R. D.; Schappert, G. T.; Jones, L. A.; Taylor, A. J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Progress on laser plasma accelerators

Several laser plasma accelerator schemes are reviewed, with emphasis on the Plasma Beat Wave Accelerator (PBWA). Theory indicates that a very high acceleration gradient, of order 1 GeV/m, can exist in the plasma wave driven by the beating lasers. Experimental results obtained on the PBWA experiment at UCLA confirms this. Parameters related to the PBWA as an accelerator system are derived, among them issues concerning the efficiency and the laser power and energy requirements are discussed.

Date: April 1, 1986

Creator: Chen, P.

Item Type: Article

Partner: UNT Libraries Government Documents Department