Laser module, control method of the same, control data of the same, and control data generation method
AssigneeEudyna Devices Inc.
InventorsHaruyoshi Ono, Isao Baba
Life of this patent
Estimating the term…
Abstract
A laser module includes a semiconductor laser, an output optical system provided on an optical output side of the semiconductor laser, a temperature detecting element that detects a temperature of the output optical system; and an output controller that calculates a drive current to set an optical output intensity of the laser module at a desired value on the basis of temperature information obtained by the temperature detecting element, and outputs the drive current to the semiconductor laser.
Claims29
A laser module comprising:
- a semiconductor laser;
- an output optical system provided on an optical output side of the semiconductor laser;
- a temperature detecting element that detects a temperature of the output optical system;
- and
- an output controller that calculates a drive current to set an optical output intensity of the laser module at a desired value on the basis of temperature information obtained by the temperature detecting element, and outputs the drive current to the semiconductor laser.
A control method of a laser module including a semiconductor laser, an output optical system provided on an optical output side of the semiconductor laser, and a temperature detecting element that detects a temperature of the output optical system, the control method comprising the steps of:
- detecting the temperature of the output optical system;
- calculating a drive current to set an optical output intensity of the laser module at a desired value with temperature information that corresponds to the temperature of the output optical system;
- and
- driving the semiconductor laser with the drive current.
A generation method of control data including a semiconductor laser, an output optical system provided on an optical output side of the semiconductor laser, a temperature detecting element that detects a temperature of the output optical system, and a light receiving element that detects a monitor optical intensity, the control method comprising the steps of:
- controlling an optical output to keep the monitor optical intensity constant on the basis of information on the monitor optical intensity obtained from the light receiving element;
- measuring a change amount of an optical output intensity output from the output optical system before and after the temperature of the output optical system changes, in a state where the step of controlling the optical output is implemented;
- and
- obtaining optical output intensity correction information that is the control data to correct a difference in the optical output intensity before and after the temperature of the output optical system changes, with the information on the change amount of the optical output intensity measured.
A generation method of control data to control a laser module including a semiconductor laser, an output optical system provided on an optical output side of the semiconductor laser, and a temperature detecting element that detects a temperature of the output optical system, the generation method comprising:
- calculating a change in an optical loss of the output optical system before and after the temperature of the output optical system changes, on the basis of a physical constant of the output optical system;
- and
- obtaining optical output intensity correction information that is the control-data to correct a difference in an optical output intensity before and after the temperature of the output optical system changes, with the information on the change in the optical loss calculated.
A generation method of control data to control a laser module including a semiconductor laser, an output optical system provided on an optical output side of the semiconductor laser, and a temperature detecting element that detects a temperature of the output optical system, the generation method comprising:
- obtaining a change amount of an outer shape of the output optical system before and after the temperature of the output optical system changes;
- calculating a change in an optical loss of the output optical system before and after the temperature of the output optical system changes, on the basis of information on the change amount obtained;
- and
- obtaining optical output intensity correction information that is the control data to correct a difference in an optical output intensity before and after the temperature of the output optical system changes, with the information on the change in the optical loss calculated.
Control data to control a laser module including a semiconductor laser, an output optical system provided on an optical output side of the semiconductor laser, and a temperature detecting element that detects a temperature of the output optical system, the control data comprising optical output intensity correction information that is the control data to correct a difference in an optical output intensity before and after the temperature of the output optical system changes, on the basis of a change in an optical loss of the output optical system.
A semiconductor laser comprising:
- a semiconductor laser;
- an output optical system provided on an optical output side of the semiconductor laser;
- and
- a temperature detecting element that detects a temperature of the output optical system.
Dependencies are inferred from the claim text.