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• 1. [Article] Pulse evolution in CO₂ lasers

  Explicit formulas are examined for the development of optical pulses in gain‐switched or Q‐switched laser oscillators and for the distortion of such pulses in succeeding stages of laser amplification. ...

  Citation × Citation Citation Abstract Copy Title: Pulse evolution in CO₂ lasers Author: Casperson, Lee W., Herbst, M. J., Turechek, John J. Year: 1976 Explicit formulas are examined for the development of optical pulses in gain‐switched or Q‐switched laser oscillators and for the distortion of such pulses in succeeding stages of laser amplification. The results are compared to data obtained with a TEA CO₂ oscillator‐amplifier system. Title: Pulse evolution in CO₂ lasers Author: Casperson, Lee W., Herbst, M. J., Turechek, John J. Year: 1976 Explicit formulas are examined for the development of optical pulses in gain‐switched or Q‐switched laser oscillators and for the distortion of such pulses in succeeding stages of laser amplification. The results are compared to data obtained with a TEA CO₂ oscillator‐amplifier system. Close

• 2. [Article] Waterfall Lasers

  Laser concepts can be applied to a broad range of physical phenomena. One of the closest parallels occurs with the fluttering oscillations that are sometimes observed in the falling sheets of water associated ...

  Citation × Citation Citation Abstract Copy Title: Waterfall Lasers Author: Casperson, Lee W. Year: 1997 Laser concepts can be applied to a broad range of physical phenomena. One of the closest parallels occurs with the fluttering oscillations that are sometimes observed in the falling sheets of water associated with fountains, dams, and natural waterfalls. In many respects these fluid feedback oscillations are similar to the electromagnetic modes of typical lasers, and recognition of this similarity led to the interpretation of the waterfall behavior. Gain profiles for the waterfall oscillations are developed, and the relationship of experimental waterfall data to the laser-like models is considered in detail. Title: Waterfall Lasers Author: Casperson, Lee W. Year: 1997 Laser concepts can be applied to a broad range of physical phenomena. One of the closest parallels occurs with the fluttering oscillations that are sometimes observed in the falling sheets of water associated with fountains, dams, and natural waterfalls. In many respects these fluid feedback oscillations are similar to the electromagnetic modes of typical lasers, and recognition of this similarity led to the interpretation of the waterfall behavior. Gain profiles for the waterfall oscillations are developed, and the relationship of experimental waterfall data to the laser-like models is considered in detail. Close

• 3. [Article] Properties of a coaxial cw CO₂ laser

  A cw CO₂ laser has been developed in which the active medium is formed by a discharge between coaxial electrodes. The laser gain and saturation properties have been studied as functions of the various ...

  Citation × Citation Citation Abstract Copy Title: Properties of a coaxial cw CO₂ laser Author: Ken, T.-K. Cheng, Casperson, Lee W. Year: 1979 A cw CO₂ laser has been developed in which the active medium is formed by a discharge between coaxial electrodes. The laser gain and saturation properties have been studied as functions of the various device parameters. Over-all efficiency is about the same as for a conventional longitudinal discharge laser, and advantages of the coaxial geometry include low voltage operation, rapid cooling, and rugged construction. Title: Properties of a coaxial cw CO₂ laser Author: Ken, T.-K. Cheng, Casperson, Lee W. Year: 1979 A cw CO₂ laser has been developed in which the active medium is formed by a discharge between coaxial electrodes. The laser gain and saturation properties have been studied as functions of the various device parameters. Over-all efficiency is about the same as for a conventional longitudinal discharge laser, and advantages of the coaxial geometry include low voltage operation, rapid cooling, and rugged construction. Close

• 4. [Article] Generalized Beam Matrices. III. Application to Diffraction Analysis

  In analogy with Huygen’s wavelets a new method based on Gaussian beamlets is used to develop a conventional diffraction integral formalism for paraxial optical systems representable by complex 2×2 ABCD ...

  Citation × Citation Citation Abstract Copy Title: Generalized Beam Matrices. III. Application to Diffraction Analysis Author: Casperson, Lee W., Tovar, Anthony A. Year: 1996 In analogy with Huygen’s wavelets a new method based on Gaussian beamlets is used to develop a conventional diffraction integral formalism for paraxial optical systems representable by complex 2×2 ABCD Gaussian beam matrices. This method, along with a new phase parameter transformation, is then used to produce a new diffraction integral for studying the propagation of light beams with arbitrary spatial profiles through much more general misaligned complex optical systems representable by 3×3 ABCDGH beam matrices. Title: Generalized Beam Matrices. III. Application to Diffraction Analysis Author: Casperson, Lee W., Tovar, Anthony A. Year: 1996 In analogy with Huygen’s wavelets a new method based on Gaussian beamlets is used to develop a conventional diffraction integral formalism for paraxial optical systems representable by complex 2×2 ABCD Gaussian beam matrices. This method, along with a new phase parameter transformation, is then used to produce a new diffraction integral for studying the propagation of light beams with arbitrary spatial profiles through much more general misaligned complex optical systems representable by 3×3 ABCDGH beam matrices. Close

• 5. [Article] Beam modes in complex lenslike media and resonators

  General sets of higher-order beam modes are derived for light propagation in media having spatial variations of the gain or loss. The resulting expressions are also valid for propagation through conventional ...

  Citation × Citation Citation Abstract Copy Title: Beam modes in complex lenslike media and resonators Author: Casperson, Lee W. Year: 1976 General sets of higher-order beam modes are derived for light propagation in media having spatial variations of the gain or loss. The resulting expressions are also valid for propagation through conventional optical elements and graded transmission filters. The four basic mode sets obtained include off-axis Hermite-Gaussian and Laguerre-Gaussian modes of both real and complex argument. A procedure is developed for finding the resonant modes of laser oscillators containing arbitrary complex lens elements, and the mode stability properties of lasers can be interpreted physically by means of these formulas. Title: Beam modes in complex lenslike media and resonators Author: Casperson, Lee W. Year: 1976 General sets of higher-order beam modes are derived for light propagation in media having spatial variations of the gain or loss. The resulting expressions are also valid for propagation through conventional optical elements and graded transmission filters. The four basic mode sets obtained include off-axis Hermite-Gaussian and Laguerre-Gaussian modes of both real and complex argument. A procedure is developed for finding the resonant modes of laser oscillators containing arbitrary complex lens elements, and the mode stability properties of lasers can be interpreted physically by means of these formulas. Close

• 6. [Article] Generalized Beam Matrices: Gaussian Beam Propagation in Misaligned Complex Optical Systems

  A novel 3 × 3 transfer-matrix method is developed to propagate off-axis Gaussian beams in astigmatic optical systems that may include tilted, displaced, or curved optical elements. Unlike in a previous ...

  Citation × Citation Citation Abstract Copy Title: Generalized Beam Matrices: Gaussian Beam Propagation in Misaligned Complex Optical Systems Author: Tovar, Anthony A., Casperson, Lee W. Year: 1995 A novel 3 × 3 transfer-matrix method is developed to propagate off-axis Gaussian beams in astigmatic optical systems that may include tilted, displaced, or curved optical elements. Unlike in a previous generalized ray matrix formalism, optical elements that possess gain or loss such as Gaussian apertures, complex lenslike media, and amplifiers are included; and a new beam transformation is found. In addition, a novel exponential variable-reflectivity mirror, which displaces a Gaussian beam without changing its spot size, and a complex prismlike medium are introduced. Title: Generalized Beam Matrices: Gaussian Beam Propagation in Misaligned Complex Optical Systems Author: Tovar, Anthony A., Casperson, Lee W. Year: 1995 A novel 3 × 3 transfer-matrix method is developed to propagate off-axis Gaussian beams in astigmatic optical systems that may include tilted, displaced, or curved optical elements. Unlike in a previous generalized ray matrix formalism, optical elements that possess gain or loss such as Gaussian apertures, complex lenslike media, and amplifiers are included; and a new beam transformation is found. In addition, a novel exponential variable-reflectivity mirror, which displaces a Gaussian beam without changing its spot size, and a complex prismlike medium are introduced. Close

• 7. [Article] Direct Current-Excited CW CO² Metal Waveguide Laser

  A novel design for a dc-excited cw CO₂ metal waveguide laser has been developed in which a slotted hollow cathode also doubles as a metal waveguide for the cavity modes. This design has been implemented ...

  Citation × Citation Citation Abstract Copy Title: Direct Current-Excited CW CO² Metal Waveguide Laser Author: Al-Mashaabi, Fahad S., Casperson, Lee W. Year: 1989 A novel design for a dc-excited cw CO₂ metal waveguide laser has been developed in which a slotted hollow cathode also doubles as a metal waveguide for the cavity modes. This design has been implemented in a compact structure that produces over 1 W of cw 10.6-µm radiation. The discharge characteristics, laser gain, and laser output have been studied as functions of various discharge parameters. The advantages of the transverse discharge of the slotted hollow cathode geometry include low voltage, positive impedance, rugged structure, and high optical gain. Overall efficiency is comparable with that of conventional longitudinal CO² lasers. The output laser modes are clean low-order Hermite-Gaussian or Airy function modes. Title: Direct Current-Excited CW CO² Metal Waveguide Laser Author: Al-Mashaabi, Fahad S., Casperson, Lee W. Year: 1989 A novel design for a dc-excited cw CO₂ metal waveguide laser has been developed in which a slotted hollow cathode also doubles as a metal waveguide for the cavity modes. This design has been implemented in a compact structure that produces over 1 W of cw 10.6-µm radiation. The discharge characteristics, laser gain, and laser output have been studied as functions of various discharge parameters. The advantages of the transverse discharge of the slotted hollow cathode geometry include low voltage, positive impedance, rugged structure, and high optical gain. Overall efficiency is comparable with that of conventional longitudinal CO² lasers. The output laser modes are clean low-order Hermite-Gaussian or Airy function modes. Close