Narrow line width operation of a 980 nm gain guided tapered diode laser bar

We demonstrate two different schemes for the spectral narrowing of a 12 emitter 980 nm gain guided tapered diode laser bar. In the first scheme, a reflective grating has been used in a Littman Metcalf configuration and the wavelength of the laser emission could be narrowed down from more than 5.5 nm in the free running mode to 0.04 nm (FWHM) at an operating current of 30 A with an output power of 8 W. The spectrum was found to be tunable within a range of 16 nm. In the second scheme, a volume Bragg grating has been used to narrow the wavelength of the laser bar from over 5 nm to less than 0.2 nm with an output of 5 W at 20 A. To our knowledge, this is the first time spectral narrowing has been performed on a gain guided tapered diode laser bar. In the Littman Metcalf configuration, the spectral brightness has been increased by 86 times and in the volume Bragg grating cavity the spectral brightness has been improved over 18 times when compared to the free running operation. These schemes could be also extended for other wavelengths of interest in the future

Volume 9, Issue 2: Full Issue

Full issue of the January 1942 issue of Manuscripts. Includes work by: Joan Fuller, Jack Kilgore, Fred W. Michel, Betty Murnan, Isadore Camhi, Mary Wiley, Jeanne Gass, Alfred Brown, Ione Colligan, Jack Retherford, Catherine Cunningham, R. Gordon Moores, Alice J. Fisher, Norma Jackson, Thelma De Boer, Betty Lee Snyder, John Gumerson, Richard Jowitt, William Hickson, Bob Harris, Rachel Whelan, Edward N. Redfield, Anshelm Schultzberg, Willard L. Metcalf, and John Bundy

Occurrence of the Tamarix Leafhopper, Opsius stactogalus Fieber (Hemiptera: Cicadellidae), in Argentina

The paleartic tamarix leafhopper,Opsius stactogalusFieber (Hemiptera: Cicadellidae), can reduce the growth of tamarisk due to the aggregate feeding imposed by their populations. The species was mentioned for Argentina in Metcalf´s catalogue (1967) without locality or region reference, and the contributions on Cicadellidae published by many authors after Metcalf omitted this distributional data. Populations of O. stactogalus on Tamarix sp. were found in 12 sites between 28º 48’ to 39º 17’ S and 64º 06’ to 70º 04’ W, located in both the Neotropical and Andean biogeographic regions.Facultad de Ciencias Naturales y Muse

Mr. Zubie W. Metcalf, Jr. Receives National Science Foundation Grant

News release announcing Assistant Professor of Biology at Florida A & M University and 1957 graduate of the University of Dayton, Mr. Zubie W. Metcalf, has received a National Science Foundation grant of $52,595 to support an Institute in Biology for Secondary School Teachers

Probate records of the province of New Hampshire vol. II 1718-1740 state papers series vol. 32

Provincial and state papers, Volume 32; Editors: v. 1, A. S. Batchellor, O. G. Hammond, E. S. Stearns.--v. 2-3, H. H. Metcalf, O. G. Hammond.--v. 4-9, O. G. Hammond.; Imprint varies: v. 2, Bristol, N. H., R. W. Musgrove, printer.--v. 3, Concord, N. H., The Rumford Press.--v. 4-9, Pub. by the state of New Hampshire

Probate records of the province of New Hampshire vol. 8 1764-1767 state papers series vol. 38

Provincial and state papers, Volume 38; Editors: v. 1, A. S. Batchellor, O. G. Hammond, E. S. Stearns.--v. 2-3, H. H. Metcalf, O. G. Hammond.--v. 4-9, O. G. Hammond.; Imprint varies: v. 2, Bristol, N. H., R. W. Musgrove, printer.--v. 3, Concord, N. H., The Rumford Press.--v. 4-9, Pub. by the state of New Hampshire

Operation of a single mode external-cavity laser diode array near 780 nm

We have narrowed the spectral bandwidth of a commercial 2 W laser diode array to be less than 120 MHz near 780 nm. The external-cavity laser diode array system is a standard double-pass Littman–Metcalf configuration operating on a dominant single longitudinal mode. © 2002 American Institute of Physics.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/69845/2/RSINAK-73-12-4169-1.pd

Probate records of the province of New Hampshire vol. 9 1767-1771 state papers series vol. 39

Provincial and state papers, Volume 39; Editors: v. 1, A. S. Batchellor, O. G. Hammond, E. S. Stearns.--v. 2-3, H. H. Metcalf, O. G. Hammond.--v. 4-9, O. G. Hammond.; Imprint varies: v. 2, Bristol, N. H., R. W. Musgrove, printer.--v. 3, Concord, N. H., The Rumford Press.--v. 4-9, Pub. by the state of New Hampshire

Probate records of the province of New Hampshire vol. 6 1757-1760 state papers series vol. 36

Provincial and state papers, Volume 36; Editors: v. 1, A. S. Batchellor, O. G. Hammond, E. S. Stearns.--v. 2-3, H. H. Metcalf, O. G. Hammond.--v. 4-9, O. G. Hammond.; Imprint varies: v. 2, Bristol, N. H., R. W. Musgrove, printer.--v. 3, Concord, N. H., The Rumford Press.--v. 4-9, Pub. by the state of New Hampshire

Probate records of the province of New Hampshire vol. 5 1754-1756 state papers series vol. 35

Provincial and state papers, Volume 35; Editors: v. 1, A. S. Batchellor, O. G. Hammond, E. S. Stearns.--v. 2-3, H. H. Metcalf, O. G. Hammond.--v. 4-9, O. G. Hammond.; Imprint varies: v. 2, Bristol, N. H., R. W. Musgrove, printer.--v. 3, Concord, N. H., The Rumford Press.--v. 4-9, Pub. by the state of New Hampshire