Method and apparatus of color mixing in a laser diode system

A method of color mixing in a laser diode system comprising the steps of:

• generating laser beams of three different colors which are a red laser beam, green laser beam, and blue laser beam, respectively by three single mode laser diode assemblies;
• supplying outputs of said single mode laser diode assemblies to three single mode fibers so that the output of each of said three single mode laser diode assemblies is supplied into respective one of said single mode fibers;
• combining the laser beams of different colors outputting from said single mode fibers into a combined laser beam;
• supplying said combined laser beam to a further single mode fiber;
• controlling each of said laser diode assemblies by an electronic control system having ratio control means for controlling a ratio of energetic brightnesses of said laser beams;
• selecting said ratio in compliance with a predetermined standard;
• energizing said laser diode assemblies for emitting said laser beams of three different colors toward said laser beam combining means;
• adjusting said ratio to said standard value with the use of said means for controlling a ratio of energetic brightnesses to form adjusted laser beams.

An apparatus of color mixing in a laser diode system comprising:

• a support means;
• at least two single mode laser diode assemblies installed on said support means and generating laser beams of at least two different wavelengths;
• at least two single mode fibers arranged so that said laser beams of at least two different labelings are supplied into said at least two single mode fibers so that a laser beam of one of said two different wavelengths is supplied into a corresponding one of said at least two single mode fibers;
• at least one laser beam combining means installed on said support means and intended for combining said laser beams of different wavelengths outputted from said at least two single mode fibers;
• a further single mode fiber arranged so that the combined laser beams of different wavelengths is supplied from said at least one laser beam combining means into said further fiber;
• and an electronic control system for each of said at least two laser diode assemblies having means for controlling a ratio of energetic brightnesses of said laser beams.

An apparatus of color mixing in a laser diode system comprising:

• a support means;
• three single mode laser diode assemblies installed on said support means and generating laser beams of three different colors;
• three single mode fibers arranged so that said laser beams of three different colors are supplied into said three single mode fibers individually so that one of said laser beams is supplied into a corresponding one of said single mode fibers;
• a first laser beam combining means installed on said support means and intended for combining two of said laser beams of three different colors outputted from two of said three single mode fibers for forming a two-component beam;
• a second laser beam combining means installed on said support means and intended for combining the third one of said three laser beams outputted from the third one of said single mode fibers with said two-component beam outputting from said first laser beam combining means a further single mode fiber receiving a three-component beam from said second laser beam combining means;
• and an electronic controls system for each of said three laser diode assemblies having means for controlling a ratio of energetic brightness of said laser beams.

A method of color mixing in a laser diode system comprising the steps of:

• generating laser beams of at least two different wavelengths by at least two single mode laser diode assemblies;
• supplying the laser beam to at least two different wavelengths into at least two single mode fibers so that a laser beam of one of said two different wavelengths if supplied into a corresponding one of said single mode fibers;
• combining the laser beams of different wavelengths outputted from said single mode fibers in a selected ratio;
• supplying the combined laser beam into further single mode fiber;
• and controlling by an electronic control system comprising at least current control means current in each of said at least two laser diode assemblies and light pulse modulation width control means for controlling duration of light pulse in each of said at least two laser diode assemblies, each said laser diode assembly having frequency stabilization means and linewidth narrowing means;
• energizing said laser diode assemblies for emitting said laser beams of at least two different wavelengths toward said laser beam combining means;
• stabilizing the frequency of the light of a selected wavelength with said frequency stabilization means;
• narrowing the linewidth of the light spectrum produced by each of said laser beam assemblies;
• obtaining light beams of colors close to perfect colors in each of said laser beam assemblies by simultaneously controlling light power with the use of said current control means and chromaticity of light with the use of said light pulse modulation control means;
• and mixing said light beams of colors close to perfect colors with the use of said at least one laser beam combining means.