Oscillator with mode control
US6324191A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 12, 2000 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Jan 12, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/1118
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An oscillator for isolating a transverse electromagnetic (TEM) zero--zero mode pulsed laser beam includes a laser pumping diode that is mounted on a base to induce a multi-mode laser beam from a lasing medium. As initially induced, the multi-mode laser beam is directed along a path and is characterized by a beating signal which has a frequency that is based on amplitude variations of laser pulses in the multi-mode laser beam. Electronics detect this beating signal and generates a responsive error signal. With closed loop control, the error signal is used to advance a straightedge toward the path of the multi-mode laser beam to remove transverse modes from the multi-mode laser beam with the straightedge. This advancement continues until the error signal is a null and the zero--zero mode pulsed laser beam is thereby isolated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.