107,626 research outputs found
Personal Papers (MS 80-0002)
No full textLetter from J. M. Combs to Isaac H. Kempner to thanking him for the preserved figs sent for Christmas
Spectral line-by-line pulse shaping of on-chip microresonator frequency combs
No full textRecently, on-chip comb generation methods based on nonlinear optical modulation in ultrahigh-quality-factor monolithic microresonators have been demonstrated, where two pump photons are transformed into sideband photons in a four-wave-mixing process mediated by Kerr nonlinearity. Here, we investigate line-by-line pulse shaping of such combs generated in silicon nitride ring resonators. We observe two distinct paths to comb formation that exhibit strikingly different time-domain behaviours. For combs formed as a cascade of sidebands spaced by a single free spectral range that spread from the pump, we are able to compress stably to nearly bandwidth-limited pulses. This indicates high coherence across the spectra and provides new data on the high passive stability of the spectral phase. For combs where the initial sidebands are spaced by multiple free spectral ranges that then fill in to give combs with single free-spectral-range spacing, the time-domain data reveal partially coherent behaviour
John H. Combs Interview, circa October 1990
No full textJohn Combs talks about his early music education, his university training, and being offered a job as the band director at Hellgate High School in Missoula, Montana in the late 1970s. He discusses the importance of band music and its roots as a uniquely American form of music. He also describes his teaching philosophy, which is to teach students about music’s role in culture and as a reflection of culture, not just how to play music. Combs articulates his concerns about the lack of complexity in modern rock and roll music and how most Americans in the 1990s consider music to play a utilitarian role rather than a cultural role in their lives and society. He describes the differences between producers, choir directors, band directors, and conductors. Combs also discusses the importance of introducing children to technically interesting music, such as classical and jazz, early on so that they develop an ear for it, which makes it easier for them to learn how to play an instrument.https://scholarworks.umt.edu/missoulamusicians_oralhistory/1003/thumbnail.jp
Recent advances in ultrafast optical parametric oscillator frequency combs
No full textWe discuss recent advances in the stabilization and application of femtosecond frequency combs based on optical parametric oscillators (OPOs) pumped by femtosecond lasers at 800 and 1060 nm. A method for locking to zero the carrier-envelope-offset of a Ti:sapphire-pumped OPO comb is described. The application of Yb:KYW-laser-pumped dual-combs for mid-infrared spectroscopy is detailed, specifically methane spectroscopy at approximately a 0.7% concentration at 1 atm
Letter from H. H. Combs to J. H. Woodward, Leavenworth, Kansas, May 18, 1886
No full textA document from an extensive collection spanning four generations of the Woodward family that operated merchant pig iron companies in West Virginia and Alabama. The collection begins with Stimpson Harvey Woodward (S. H. Woodward), a native of Massachusetts, who moved from Pittsburgh to Wheeling, West Virginia in 1852. He had interests in an iron company as early as 1852 in West Virginia and began Alabama operations in 1869. The family business continued in Alabama until the death of S. H. Woodward's great-grandson in 1965
Letter from H. H. Combs, St. Louis, Missouri, to J. H. Woodward, May 17, 1886
No full textA document from an extensive collection spanning four generations of the Woodward family that operated merchant pig iron companies in West Virginia and Alabama. The collection begins with Stimpson Harvey Woodward (S. H. Woodward), a native of Massachusetts, who moved from Pittsburgh to Wheeling, West Virginia in 1852. He had interests in an iron company as early as 1852 in West Virginia and began Alabama operations in 1869. The family business continued in Alabama until the death of S. H. Woodward's great-grandson in 1965
Letter from H. H. Combs, St. Louis, Missouri, to J. H. Woodward, Birmingham, Alabama, May 20, 1886
No full textA document from an extensive collection spanning four generations of the Woodward family that operated merchant pig iron companies in West Virginia and Alabama. The collection begins with Stimpson Harvey Woodward (S. H. Woodward), a native of Massachusetts, who moved from Pittsburgh to Wheeling, West Virginia in 1852. He had interests in an iron company as early as 1852 in West Virginia and began Alabama operations in 1869. The family business continued in Alabama until the death of S. H. Woodward's great-grandson in 1965
Letter from H. H. Combs, St. Louis, Missouri, to J. H. Woodward, Wheeling, Alabama, October 6, 1885
No full textA document from an extensive collection spanning four generations of the Woodward family that operated merchant pig iron companies in West Virginia and Alabama. The collection begins with Stimpson Harvey Woodward (S. H. Woodward), a native of Massachusetts, who moved from Pittsburgh to Wheeling, West Virginia in 1852. He had interests in an iron company as early as 1852 in West Virginia and began Alabama operations in 1869. The family business continued in Alabama until the death of S. H. Woodward's great-grandson in 1965
Letter from H. H. Combs, St. Louis, Missouri, to J. H. Woodward, Wheeling, Alabama, June 15, 1885
No full textA document from an extensive collection spanning four generations of the Woodward family that operated merchant pig iron companies in West Virginia and Alabama. The collection begins with Stimpson Harvey Woodward (S. H. Woodward), a native of Massachusetts, who moved from Pittsburgh to Wheeling, West Virginia in 1852. He had interests in an iron company as early as 1852 in West Virginia and began Alabama operations in 1869. The family business continued in Alabama until the death of S. H. Woodward's great-grandson in 1965
Western Union Telegram from H. H. Combs, St. Louis, Missouri, to J. H. Woodward, August 15, 1884
No full textA document from an extensive collection spanning four generations of the Woodward family that operated merchant pig iron companies in West Virginia and Alabama. The collection begins with Stimpson Harvey Woodward (S. H. Woodward), a native of Massachusetts, who moved from Pittsburgh to Wheeling, West Virginia in 1852. He had interests in an iron company as early as 1852 in West Virginia and began Alabama operations in 1869. The family business continued in Alabama until the death of S. H. Woodward's great-grandson in 1965
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