Title:
レーザー状作用を供給する強散乱利得媒体を有する光学源
Document Type and Number:
Japanese Patent JP3816948
Kind Code:
B2
Abstract:
A gain medium is comprised of a multi-phase system wherein: a first phase is an electromagnetic radiation emission phase; a second phase is an electromagnetic radiation scattering phase; and a third phase is a transparent matrix phase. By example, the emission phase may consist of dye molecules, the scattering phase may consist of high contrast particles, and the matrix phase may consist of a solvent such as methanol. In some embodiments of this invention the emission and scattering phases may be the same phase, as when semiconductor particles are employed. A smallest dimension of a body comprised of the gain medium may be less than a scattering length associated With the scattering phase. It is shown that nearly thresholdless laser behavior is observed in strongly scattering optically pumped dye-methanol solutions containing colloidal TiO2 or Al2O3 ruby nanoparticles. The emission from the high gain colloid exhibits a slope change in the linear input-output characteristics above a critical pump pulse energy. The change in slope is accompanied by a spectral line narrowing with a bichromatic spectrum appearing at high pump energies.
Inventors:
Rawandina Bill M.
Application Number:
JP52465195A
Publication Date:
August 30, 2006
Filing Date:
March 06, 1995
Export Citation:
Assignee:
Brown University Research Foundation
International Classes:
H01S3/10; H01S3/16; A61N5/06; D06F93/00; G01N21/01; G01N21/63; G01N21/64; G07D7/12; H01S3/06; H01S3/14; H01S5/00; A61B17/22; C40B60/14; H01S3/0941; H01S3/20; H01S3/213; H01S5/04; H01S5/30
Domestic Patent References:
| JP5175616A |
Other References:
Optics letters, 1993年,Vol.18 No.2, p.119-121
Nature, 1994年 3月31日,Vol.368 No.6470, p.436-438
Nature, 1994年 3月31日,Vol.368 No.6470, p.436-438
Attorney, Agent or Firm:
Motohiko Fujimura