Output control apparatus of laser unit and adjusting method thereof
US5140601A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1991 |
| Grant date | Aug 18, 1992 |
| Priority date | — |
| Expiry date | Jun 13, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/0683
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An output control apparatus for controlling emission power of a laser unit includes: a monitor circuit for generating a first monitor signal corresponding to the emission power of the laser unit; a monitor signal amplifier for amplifying the first monitor signal and for outputting a second monitor signal, the monitor signal amplifier having a trimable resistor for adjusting a gain; and a control circuit for controlling the emission power of the laser unit based on the second monitor means so that the emission power of the laser unit is maintained at a predetermined power level. A method for adjusting the above output control apparatus includes the following steps (a) and (b) of: (a) maintaining the emission power of the laser unit at a predetermined power level; and (b) carrying out a trimming of the trimable resistor so that the second monitor signal becomes a predetermined value while the step (a) is being carried out. Thus, the gain of the monitor signal amplifier is adjusted so that the emission power having the predetermined power level is obtained when the second monitor signal is equal to the predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.