Dr. William F. Krupke Profile

Dr. William F. Krupke

President at WFK Lasers LLC

SPIE Involvement:

Author

Publications (25)

Proceedings Article | 21 February 2020 Paper

High efficiency gallium nitride laser diode pumped CW ruby laser

William Krupke, Jason Zweiback

Proceedings Volume 11259, 112591P (2020) https://doi.org/10.1117/12.2545176

KEYWORDS: Ruby lasers, Semiconductor lasers, Ruby, Continuous wave operation, Crystals, Gallium nitride, Absorption, Laser crystals, Reflectivity, Diodes

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Proceedings Article | 3 March 2010 Paper

Alkali-vapor lasers

J. Zweiback, A. Komashko, W. Krupke

Proceedings Volume 7581, 75810G (2010) https://doi.org/10.1117/12.843594

KEYWORDS: Rubidium, Semiconductor lasers, Diodes, Alexandrite lasers, Head, Absorption, Alkali vapor lasers, Copper, Light emitting diodes, Lasers

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Proceedings Article | 20 February 2009 Paper

Rubidium and potassium alkali lasers

J. Zweiback, B. Krupke

Proceedings Volume 7196, 71960E (2009) https://doi.org/10.1117/12.807850

KEYWORDS: Diodes, Semiconductor lasers, Rubidium, Potassium, Laser optics, Fiber Bragg gratings, Waveguides, Laser development, Resonators, Lasers

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Proceedings Article | 14 May 2008 Paper

Diode pumped alkali lasers (DPALs): an overview

William Krupke

Proceedings Volume 7005, 700521 (2008) https://doi.org/10.1117/12.782466

KEYWORDS: Rubidium, Cesium, Semiconductor lasers, Potassium, Helium, Diodes, Chemical species, Capillaries, Waveguides, High power lasers

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Proceedings Article | 12 May 2008 Paper

High power diode pumped alkali vapor lasers

J. Zweiback, B. Krupke

Proceedings Volume 7005, 700525 (2008) https://doi.org/10.1117/12.782704

KEYWORDS: Diodes, Semiconductor lasers, Rubidium, Absorption, Methane, Potassium, Alexandrite lasers, High power lasers, Laser development, Alkali vapor lasers

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Proceedings Article | 21 February 2008 Paper

Diode-pumped alkali vapor lasers for high power applications

J. Zweiback, B. Krupke, A. Komashko

Proceedings Volume 6874, 68740G (2008) https://doi.org/10.1117/12.761287

KEYWORDS: Rubidium, Absorption, Potassium, Diodes, Semiconductor lasers, Cesium, Alexandrite lasers, Helium, High power lasers, Chemical species

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Proceedings Article | 20 September 2004 Paper

New class of cw high-power diode-pumped alkali lasers (DPALs) (Plenary Paper)

William Krupke, Raymond Beach, Vernon Kanz, Stephen Payne, James Early

Proceedings Volume 5448, (2004) https://doi.org/10.1117/12.547954

KEYWORDS: Rubidium, Semiconductor lasers, Cesium, Diodes, Chemical species, Helium, Solar cells, Potassium, Continuous wave operation, Silicon

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Proceedings Article | 11 May 2004 Paper

DPAL: a new class of CW near-infrared high-power diode-pumped alkali (vapor) lasers

William Krupke, Raymond Beach, Vernon Kanz, Stephen Payne

Proceedings Volume 5334, (2004) https://doi.org/10.1117/12.537984

KEYWORDS: Helium, Rubidium, Cesium, Semiconductor lasers, Potassium, Chemical species, Diodes, Reflectivity, Capillaries, Planar waveguides

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Proceedings Article | 3 April 2000 Paper

Advanced diode-pumped solid state lasers (DPSSLs): near term trends and future prospects

William Krupke

Proceedings Volume 3889, (2000) https://doi.org/10.1117/12.380885

KEYWORDS: Semiconductor lasers, Diodes, Nd:YAG lasers, High power lasers, Solid state lasers, Diode pumped solid state lasers, Mirrors, Laser applications, Materials processing, Resonators

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Proceedings Article | 7 February 2000 Paper

Advanced diode-pumped solid state lasers (DPSSLs): near-term trends and future prospects

William Krupke

Proceedings Volume 3888, (2000) https://doi.org/10.1117/12.377020

KEYWORDS: Semiconductor lasers, Nd:YAG lasers, Diodes, High power lasers, Solid state lasers, Diode pumped solid state lasers, Laser applications, Mirrors, Materials processing, Continuous wave operation

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Proceedings Article | 1 February 2000 Paper

Advanced diode-pumped solid state lasers (DPSSLs): near-term trends and future prospects

William Krupke

Proceedings Volume 3885, (2000) https://doi.org/10.1117/12.376963

KEYWORDS: Semiconductor lasers, Diodes, Nd:YAG lasers, High power lasers, Solid state lasers, Diode pumped solid state lasers, Mirrors, Laser applications, Materials processing

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Proceedings Article | 14 January 2000 Paper

Advanced diode-pumped solid state lasers (DPSSLs): near-term trends and future prospects

William Krupke

Proceedings Volume 3887, (2000) https://doi.org/10.1117/12.375186

KEYWORDS: Semiconductor lasers, Diodes, Nd:YAG lasers, High power lasers, Solid state lasers, Diode pumped solid state lasers, Mirrors, Laser applications, Materials processing, Resonators

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Proceedings Article | 11 January 2000 Paper

Advanced diode-pumped solid state laseres (DPSSLs): near-term trends and future prospects

William Krupke

Proceedings Volume 3886, (2000) https://doi.org/10.1117/12.375104

KEYWORDS: Semiconductor lasers, Diodes, Nd:YAG lasers, High power lasers, Solid state lasers, Diode pumped solid state lasers, Laser applications, Mirrors, Materials processing, Continuous wave operation

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Proceedings Article | 19 July 1999 Paper

Spectroscopic study of Dy3+- and Yb3+-doped double chloride and double fluoride crystals for telecommunication amplifiers and IR lasers

Alexandra Tkachuk, Svetlana Ivanova, Ludmila Isaenko, Alexander Yelisseyev, William Krupke, Stephen Payne, Richard Solarz, Mike Nostrand, Ralph Page

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.354940

KEYWORDS: Crystals, Laser crystals, Ytterbium, Dysprosium, Energy transfer, Telecommunications, Optical amplifiers, Crystallography, Spectroscopy, Infrared lasers

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Proceedings Article | 14 September 1998 Paper

Heat capacity disk laser

George Albrecht, Steven Sutton, E. George, Walter Sooy, William Krupke

Proceedings Volume 3343, (1998) https://doi.org/10.1117/12.321589

KEYWORDS: Solid state lasers, Ions, Disk lasers, Solid state electronics, Temperature metrology, Laser applications, Fusion energy, Solid state physics, Physics, Laser crystals

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Proceedings Article | 8 December 1997 Paper

Diode-pumped solid state lasers (DPSSLs) for inertial fusion energy (IFE)

William Krupke

Proceedings Volume 3047, (1997) https://doi.org/10.1117/12.294354

KEYWORDS: Semiconductor lasers, Mercury, Laser development, Solid state lasers, Fusion energy, Diode pumped solid state lasers, Venus, Laser systems engineering, Thermography, Medium wave

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Proceedings Article | 1 November 1997 Paper

New class of diode-pumped mid-IR broadly tunable lasers based on TM2+ ions in Td coordination: Cr2+:ZnX (X=S,Se)

William Krupke, Ralph Page, Kathleen Schaffers, Stephen Payne, Raymond Beach, Jay Skidmore, Mark Emanuel

Proceedings Volume 3176, (1997) https://doi.org/10.1117/12.293479

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Proceedings Article | 12 November 1996 Paper

New tunable lasers for potential use in lidar systems

Stephen Payne, Ralph Page, Christopher Marshall, Kathleen Schaffers, Andy Bayramian, William Krupke

Proceedings Volume 2833, (1996) https://doi.org/10.1117/12.258151

KEYWORDS: Solid state lasers, Tunable lasers, Crystals, Absorption, Laser crystals, Semiconductor lasers, Ultraviolet radiation, Mid-IR, Laser applications, Optical parametric oscillators

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Proceedings Article | 10 May 1996 Paper

Applications of high-average-power nonlinear optics

Stephan Velsko, William Krupke

Proceedings Volume 2700, (1996) https://doi.org/10.1117/12.239652

KEYWORDS: Absorption, Crystals, Nonlinear optics, Nonlinear crystals, Optical parametric oscillators, Laser systems engineering, Nd:YAG lasers, Ferroelectric materials, Harmonic generation, Frequency conversion

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Proceedings Article | 8 December 1995 Paper

Diode-pumped solid state laser driver experiments for inertial fusion energy applications

Christopher Marshall, Stephen Payne, Mark Emanuel, Larry Smith, Howard Powell, William Krupke

Proceedings Volume 2633, (1995) https://doi.org/10.1117/12.228300

KEYWORDS: Diodes, Crystals, Fusion energy, Semiconductor lasers, Oscillators, Diode pumped solid state lasers, Output couplers, Solid state lasers, Laser crystals, Absorption

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Although solid-state lasers have been the primary means by which the physics of inertial confinement fusion (ICF) have been investigated, it was previously thought that solid-state laser technology could not offer adequate efficiencies for an inertial fusion energy (IFE) power plant. Orth and co-workers have recently designed a conceptual IFE power plant, however, with a high efficiency diode-pumped solid-state laser (DPSSL) driver that utilized several recent innovations in laser technology. It was concluded that DPSSLs could offer adequate performance for IFE with reasonable assumptions. This system was based on a novel diode pumped Yb-doped Sr₅(PO₄)₃F(Yb:S-FAP) amplifier. Because this is a relatively new gain medium, a project was established to experimentally validate the diode-pumping and extraction dynamics of this system at the smallest reasonable scale. This paper reports on the initial experimental results of this study. We found the pumping dynamics and extraction cross-sections of Yb:S-FAP crystals to be similar to those previously inferred by purely spectroscopic techniques. The saturation fluence for pumping was measured to be 2.2 J/cm² using three different methods based on either the spatial, temporal, or energy transmission properties of a Yb:S-FAP rod. The small signal gain implies an emission cross section of 6.0 multiplied by 10^-20 cm² that falls within error bars of the previously reported value of 7.3 multiplied by 10^-20 cm², obtained from spectroscopic techniques. Up to 1.7 J/cm³ of stored energy density was achieved in a 6 multiplied by 6 multiplied by 44 mm³ Yb:S-FAP amplifier rod. In a free running configuration diode-pumped slope efficiencies up to 43% were observed with output energies up to approximately 0.5 J per 1 ms pulse from a 3 multiplied by 3 multiplied by 30 mm³ rod. When the rod was mounted in a copper block for cooling, 13 W of average power was produced with power supply limited operation at 70 Hz with 500 microsecond pulses.

Proceedings Article | 8 December 1995 Paper

Can solid state laser technology serve usefully beyond fusion ignition facilities?

Stephen Payne, Howard Powell, William Krupke

Proceedings Volume 2633, (1995) https://doi.org/10.1117/12.228297

KEYWORDS: Semiconductor lasers, Solid state lasers, Fusion energy, Silica, Adaptive optics, Diodes, Diode pumped solid state lasers, Laser welding, Absorption, Laser applications

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Proceedings Article | 1 June 1994 Paper

Properties of Ce:LiSrAlF6 and Ce:LiCaAlF6 ultraviolet lasers

Christopher Marshall, Stephen Payne, Joel Speth, John Tassano, William Krupke, Gregory Quarles, Vida Castillo, Bruce Chai

Proceedings Volume 2115, (1994) https://doi.org/10.1117/12.172733

KEYWORDS: Solid state lasers, Absorption, Crystals, Ultraviolet radiation, Laser crystals, Oscillators, Polarization, Laser beam diagnostics, Cerium, Ions

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Proceedings Article | 21 July 1993 Paper

Characterization of Cr:LiSAF solid state laser properties

Stephen Payne, Larry Smith, Laura DeLoach, Wayne Kway, John Tassano, William Krupke

Proceedings Volume 1863, (1993) https://doi.org/10.1117/12.149282

KEYWORDS: Semiconductor lasers, Alexandrite lasers, Laser systems engineering, Upconversion, Solid state lasers, Oscillators, Amplifiers, Crystals, Femtosecond phenomena, Alexandrite

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Proceedings Article | 24 June 1993 Paper

New challenges in optical materials development

William Krupke

Proceedings Volume 1848, (1993) https://doi.org/10.1117/12.147388

KEYWORDS: Semiconductor lasers, Diodes, Solid state lasers, Crystals, Diode pumped solid state lasers, Ions, Neodymium, Ytterbium, Laser crystals, Chromium

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Proceedings Article | 1 April 1990 Paper

Ground-state depleted laser in neodymium-doped yttrium orthosilicate

Raymond Beach, George Albrecht, Richard Solarz, William Krupke, Brian Comaskey, Scott Mitchell, Charles Brandle, George Berkstresser

Proceedings Volume 1223, (1990) https://doi.org/10.1117/12.18408

KEYWORDS: Crystals, Absorption, Neodymium, Solid state lasers, Samarium, Q switched lasers, Polarization, Luminescence, Alexandrite lasers, Spectroscopy

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A ground state depleted (GSD)^1,2 laser has been demonstrated in the form of a Q-switched oscillator operating at 912 nm. Using Nd³⁺ as the active ion and Y2SiO5 as the host material, the laser transition is from the lowest lying stark level of the Nd³⁺⁴F_3/2 level to a stark level 355 cm^-1 above the lowest lying one in the ⁴I_9/2 manifold. The necessity of depleting the ground ⁴I_9/2 manifold is evident for this level scheme as transparency requires a 10% inversion. To achieve the high excitation levels required for the efficient operation of this laser, bleach wave pumping using an alexandrite laser at 745 nm has been employed. The existence of a large absorption feature at 810 nm also allows for the possibility of A1GaAs laser diode pumping. Using KNbO₃, noncritical phase matching is possible at 140°C using d₃₂ and has been demonstrated. The results of Q-switched laser performance and harmonic generation in KNbO₃ will be presented. Orthosilicate is a monoclinic biaxial crystal. An oriented spectroscopic evaluation consisting of a Judd-Ofelt analysis of oriented absorption spectra and the measurements of oriented emission spectra has been completed and will be presented. Results of modeling using these spectroscopically determined parameters will be compared with the actual laser performance. The performance of this laser at 911 nm which allows accessing Cs atomic resonance filters through harmonic doubling will also be discussed. Orthosilicate can be grown in large boules of excellent optical quality using a Czochralski technique. Because of the relatively small 912 nm emission cross section of 2-3 x 10^-20cm² (orientation dependent) fluences of 10-20 J/cm² must be circulated in the laser cavity for the efficient extraction of stored energy. This necessitates very aggressive laser damage thresholds. Results from the Reptile laser damage facility at Lawrence Livermore National Laboratory (LLNL) will be presented showing Y₂SiO₅ bulk and AR sol-gel coated surface damage thresholds of greater than 40 J/cm² for 10 nsec, 10 Hz, 1.06 μ pulses.

Showing 5 of 25 publications

Conference Committee Involvement (2)

International Advisory Board

1 November 1999 | Osaka, Japan

Solid State Lasers for Application to Inertial Confinement Fusion (ICF)

30 May 1995 | Monterey, United States

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