发明名称 |
OPTICAL SOURCES HAVING A STRONGLY SCATTERING GAIN MEDIUM PROVIDING LASER-LIKE ACTION |
摘要 |
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 transpare nt matrix phase. By example, the emission phase may consist of dye molecules, t he scattering phase may consist of high contrast particles, and the matrix phas e 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 compris ed 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 appeari ng at high pump energies.
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申请公布号 |
CA2184367(C) |
申请公布日期 |
2005.01.04 |
申请号 |
CA19952184367 |
申请日期 |
1995.03.06 |
申请人 |
BROWN UNIVERSITY RESEARCH FOUNDATION |
发明人 |
LAWANDY, NABIL M. |
分类号 |
H01S3/10;A61B17/22;A61N5/06;C40B60/14;D06F93/00;G01N21/01;G01N21/63;G01N21/64;G07D7/12;H01S3/06;H01S3/0941;H01S3/14;H01S3/16;H01S3/20;H01S3/213;H01S5/00;H01S5/04;H01S5/30;(IPC1-7):H01S3/16 |
主分类号 |
H01S3/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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