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in creator/contributor: "Ebbers, C A"

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Summary of known linear and nonlinear optical properties of LiInS{sub 2}

LiInS{sub 2} is a potentially useful crystal for cascaded parametric frequency conversion in the mid-IR. It is nearly noncritically phasematched for 1.064 {mu}m pumped, degenerate 2.12 {mu}m generation and 2 micron pumped generation of 3--5 {mu}m light. The nonlinear optical coefficients are 2{times} larger than those of KTP or KTA, while the transparency extends from 0.5--8 {mu}m. LiInS{sub 2} crystals are currently available in volumes up to 5 mm{sup 3}. This memo provides a brief summary of … more

Date: February 24, 1994

Creator: Ebbers, C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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FY2005 Progress Summary and FY2006 Program Plan Statement of Work and Deliverables for Development of High Average Power Diode-Pumped Solid State Lasers, and Complementary Technologies, for Applications in Energy and Defense

The primary focus this year was to operate the system with two amplifiers populated with and pumped by eight high power diode arrays. The system was operated for extended run periods which enabled average power testing of components, diagnostics, and controls. These tests were highly successful, with a demonstrated energy level of over 55 joules for 4 cumulative hours at a repetition rate of 10 Hz (average power 0.55 kW). In addition, high average power second harmonic generation was demonstrat… more

Date: March 24, 2006

Creator: Ebbers, C

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Frequency conversion of high peak and high average power lasers

We examine the potential performance of existing materials for frequency conversion of a 10 Hz, 10 ns, I kilowatt average power laser.

Date: April 28, 1997

Creator: Ebbers, C. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The Mercury Laser System-A scaleable average-power laser for fusion and beyond

Nestled in a valley between the whitecaps of the Pacific and the snowcapped crests of the Sierra Nevada, Lawrence Livermore National Laboratory (LLNL) is home to the nearly complete National Ignition Facility (NIF). The purpose of NIF is to create a miniature star-on demand. An enormous amount of laser light energy (1.8 MJ in a pulse that is 20 ns in duration) will be focused into a small gold cylinder approximately the size of a pencil eraser. Centered in the gold cylinder (or hohlraum) will b… more

Date: March 26, 2008

Creator: Ebbers, C A & Moses, E I

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The Mercury Laser Advances Laser Technology for Power Generation

The National Ignition Facility (NIF) at Lawrence Livermore Laboratory is on target to demonstrate 'breakeven' - creating as much fusion-energy output as laser-energy input. NIF will compress a tiny sphere of hydrogen isotopes with 1.8 MJ of laser light in a 20-ns pulse, packing the isotopes so tightly that they fuse together, producing helium nuclei and releasing energy in the form of energetic particles. The achievement of breakeven will culminate an enormous effort by thousands of scientists … more

Date: January 21, 2009

Creator: Ebbers, C A; Caird, J & Moses, E

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Optical and thermo-optical characterization of KTP and its isomorphs for 1.06 {micro}m pumped OPO`s

The need to protect personnel from inadvertent eye trauma from fielded laser sources dictates that the highest externally accessible fluences produced by these systems be kept below the maximum permissible exposure (MPE) for intra-beam viewing. The large MPE value for a typical Q-switched (10 ns pulsewidth) source is 1 J/cm{sup 2} for wavelengths in the range of 1.5--1.8 microns, while the MPE for a similar pulsewidth Nd:YAG source is 5 {micro}J/cm{sup 2}. This 5 order of magnitude difference i… more

Date: February 17, 1996

Creator: Ebbers, C. A. & Velsko, S. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High-Beam-Quality Optical Parametric Chirped-Pulse Amplification in Periodically-Poled KTiOPO4

We have demonstrated a high-gain optical parametric chirped-pulse amplifier for Nd:glass-based short-pulse laser systems based on periodically poled potassium-titanyl-phosphate. Our amplifier produced high single-pass gain, broad bandwidth, excellent beam quality and stability.

Date: September 25, 2003

Creator: Ebbers, C A; Schmidt, J R & Jovanovic, I

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Performance of a diode-end-pumped Yb:YAG laser

Using an end-pumped technology developed at LLNL we have demonstrated a Yb:YAG laser capable of delivering up to 434 W of CW power and 280 W of Q-switched power. In addition, we have frequency doubled the output to 515 nm using a dual crystal scheme to produce 76 W at 10 kHz in a 30 ns pulse length.

Date: May 5, 1997

Creator: Bibeau, C.; Beach, R.; Ebbers, C. & Emanuel, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A high average power electro-optic switch using KTP

High damage threshold, high thermal conductivity, and small thermo-optic coefficients make KTiOPO{sub 4} (KTP) an attractive material for use in a high average power Q-switch. However, electro-chromic damage and refractive index homogeneity have prevented the utilization of KTP in such a device in the past. This work shows that electro-chromic damage is effectively suppressed using capacitive coupling, and a KTP crystal can be Q-switched for 1.5 {times} 10{sup 9} shots without any detectable el… more

Date: April 1, 1994

Creator: Ebbers, C. A.; Cook, W. M. & Velsko, S. P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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CW and Q-switched performance of a diode end-pumped Yb:YAG laser. Revision 1

Using an end-pumped technology developed at LLNL we have demonstrated a Yb:YAG laser capable of delivering up to 434 W of CW power and 226 W of Q-switched power. In addition, we have frequency doubled the output to 515 nm using a dual crystal scheme to produce 76 W at 10 kHz in a 30 ns pulse length.

Date: February 19, 1997

Creator: Bibeau, C.; Beach, R.; Ebbers, C.; Emanuel, M. & Skidmore, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Type 1 Frequency Doubling at 1064 nm in LaCa40(B03)3 (LaCOB), GdCa40(B03)3(GdCOB), and YCa40(B03)3(YCOB)

We have grown and characterized LaCOB, a new member to the GdCOB family of nonlinear crystals. LaCOB has a d{sub eff} of 0.52 {plus_minus} 0.05 pm/V and an angular sensitivity of 1224 {plus_minus} 184 (cm-rad){sup -1} for type I frequency doubling at 1064 nm. The d{sub {alpha}{beta}{beta}} and d{sub {gamma}{beta}{beta}} coefficients of the nonlinear optical tensor for LaCOB, GdCOB, and YCOB were determined to have values of {vert_bar}0.26 {plus_minus} 0.04{vert_bar} pm/V and |1.69 {plus_minus} … more

Date: March 7, 2001

Creator: Adams, J. J.; Ebbers, C. A.; Schaffers, K. I. & Payne, S. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Yb{sup 3+}:BaCaBO{sub 3}F: A potential new self-frequency-doubling laser material

Yb:BaCaBO{sub 3}F (Yb:BCBF) has been investigated as a new laser crystal with potential for self-frequency-doubling. An YB:BCBF laser has been pumped at 912 mm, and a measured slope efficiency of 38% has been obtained for the fundamental laser output at 1034 nm. Single crystal powders of BCBF have been compared with K*P for a relative measure of the second harmonic generating potential, yielding d{sub eff}[BCBF]= (0-66)d{sub eff}[K*P]. The growth, spectroscopy, laser performance, and linear and… more

Date: March 9, 1995

Creator: Schaffers, K. I.; DeLoach, L. D.; Ebbers, C. A. & Payne, S. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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250 watt average power electro-quality Q-switched diode pumped power oscillator

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: Article

Partner: UNT Libraries Government Documents Department

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Laser System for Livermore's Mono Energetic Gamma-Ray Source

A Mono-energetic Gamma-ray (MEGa-ray) source, based on Compton scattering of a high-intensity laser beam off a highly relativistic electron beam, requires highly specialized laser systems. To minimize the bandwidth of the {gamma}-ray beam, the scattering laser must have minimal bandwidth, but also match the electron beam depth of focus in length. This requires a {approx}1 J, 10 ps, fourier-transform-limited laser system. Also required is a high-brightness electron beam, best provided by a photo… more

Date: March 14, 2011

Creator: Gibson, D.; Albert, F.; Bayramian, A.; Marsh, R.; Messerly, M.; Ebbers, C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Generation of high-contrast millijoule pulses by optical parametric chirped-pulse amplification in periodically poled KTiOPO4

A new high-contrast, high-gain optical parametric chirped-pulse amplifier (OPCPA) architecture is demonstrated in periodically poled KTiOPO{sub 4} (PPKTP). This architecture overcomes parametric fluorescence contrast limitations of OPCPA in periodically poled materials. The scheme is based on two passes of a single, relay imaged, pump pulse and a free-propagating signal pulse through a 1.5 x 5 x 7.5 mm{sup 3} PPKTP crystal. The output energy of 1.2 mJ is generated at a center wavelength of 1053… more

Date: October 1, 2004

Creator: Jovanovic, I; Forget, N; Brown, C G; Ebbers, C A; Blanc, C L & Barty, C J

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Double-passed, high-energy quasi-phase-matched optical parametric chirped-pulse amplifier

Quasi-phase-matched (QPM) optical parametric chirped-pulse amplification (OPCPA) in periodically poled materials such as periodically poled LiNbO{sub 3} (PPLN) and periodically poled KTiOPO{sub 4} (PPKTP) has been shown to exhibit advantages over the OPCPA in bulk nonlinear crystals. [GHH98, RPN02] The use of the maximum material nonlinear coefficient results in ultra-high gain with low pump peak power. Furthermore, propagation of signal, pump, and idler beams along one of the crystal principal… more

Date: September 19, 2005

Creator: Jovanovic, I; Forget, N; Brown, C G; Ebbers, C A; Blanc, C L & Barty, C J

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Nondegenerate Optical Parametric Chirped Pulse Amplification

We present the first recompression of amplified pulses in a highly nondegenerate optical parametric chirped pulse amplifier. 60-fs recompressed pulse width and up to 2 mJ pulses were obtained in our experiments.

Date: November 7, 2001

Creator: Jovanovic, I.; Ebbers, C.; Stuart, B.; Hermann, M. & Morse, E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Highly Efficient Tabletop Optical Parametric Chirped Pulse Amplifier at 1 (micron)m

Optical parametric chirped pulse amplification (OPCPA) is a scalable technology, for ultrashort pulse amplification. Its major advantages include design simplicity, broad bandwidth, tunability, low B-integral, high contrast, and high beam quality. OPCPA is suitable both for scaling to high peak power as well as high average power. We describe the amplification of stretched 100 fs oscillator pulses in a three-stage OPCPA system pumped by a commercial, single-longitudinal-mode, Q-switched Nd:YAG … more

Date: December 4, 2001

Creator: Jovanovic, I.; Ebbers, C. A.; Comaskey, B. J.; Bonner, R. A. & Morse, E. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Thermally induced dephasing in periodically poled KTiOPO4 nonlinear crystals

Experimental data that exhibits a continuous-wave, second-harmonic intensity threshold (15 kW/cm{sup 2}) that causes two-photon nonlinear absorption which leads to time-dependent photochromic damage in periodically poled KTiOPO{sub 4} is presented and verified through a thermal dephasing model.

Date: March 18, 2004

Creator: Dawson, J W; Pennington, D M; Jovanovic, I; Liao, Z M; Payne, S A; Drobshoff, A D et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Laser Research and Development Studies for Laser Guide Star Systems

In this paper we consider two CW solid state laser approaches to a 589 nm LGS system. Both are based on the technique of sum-frequency generation, but differ in the cavity architecture. Both technologies are very promising and are worth of further consideration. This preliminary proposal is intended to encompass both designs. A down select shall be performed early in the project execution to focus on the most promising option. The two design options consist of: (1) A dual-frequency resonator wi… more

Date: February 23, 2000

Creator: Pennington, D.; Beach, R.; Ebbers, C.; Erbert, G.; Nguyen, H.; Page, R. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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DPSSL-Driven Targets: A Whiter Shade of Green?

No Description Available.

Date: October 21, 2004

Creator: Perkins, L J; Beach, R; Bibeau, C; Ebbers, C; Latkowski, J; Manes, K et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High-average-power diode-end-pumped intracavity-doubled Nd:YAG laser

A compact diode-pumped ND:YAG laser was frequency-doubled to 0.532 {mu}m with an intracavity KTP or LBO crystal using a `V` cavity configuration. Two acousto-optic Q-switches were employed at repetition rates of 10-30 kHz. Dichroic fold and end mirrors were used to output two beams with up to 140 W of 0.532 {mu}m power using KTP and 116 W using LBO as the frequency doubling crystal. This corresponds to 66% of the maximum output power at 1.064 {mu}m obtained with an optimized output coupler refl… more

Date: February 12, 1998

Creator: Honea, E. C.; Ebbers, C. A.; Beach, R. J.; Speth, J. A.; Emanuel, M. S.; Skidmore, J. A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Yttrium Calcium Oxyborate for High Average Power Frequency Doubling and OPCPA

Significant progress has been achieved recently in the growth of Yttrium Calcium Oxyborate (YCOB) crystals. Boules have been grown capable of producing large aperture nonlinear crystal plates suitable for high average power frequency conversion or optical parametric chirped pulse amplification (OPCPA). With a large aperture (5.5 cm x 8.5 cm) YCOB crystal we have demonstrated a record 227 W of 523.5nm light (22.7 J/pulse, 10 Hz, 14 ns). We have also demonstrated the applicability of YCOB for 105… more

Date: June 20, 2006

Creator: Liao, Z. M.; Jovanovic, I.; Ebbers, C. A.; Bayramian, A.; Schaffers, K.; Caird, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Removal of Lattice Imperfections that Impact the Optical Quality of Ti:Sapphire using Advanced Magnetorheological Finishing Techniques

Advanced magnetorheological finishing (MRF) techniques have been applied to Ti:sapphire crystals to compensate for sub-millimeter lattice distortions that occur during the crystal growing process. Precise optical corrections are made by imprinting topographical structure onto the crystal surfaces to cancel out the effects of the lattice distortion in the transmitted wavefront. This novel technique significantly improves the optical quality for crystals of this type and sets the stage for increa… more

Date: February 26, 2008

Creator: Menapace, J. A.; Schaffers, K. I.; Bayramian, A. J.; Davis, P. J.; Ebbers, C. A.; Wolfe, J. E. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department