Speckle suppressed laser projection system with partial beam reflection

A speckle suppressed laser projection system comprising:

• a laser which projects a beam;
• a partially reflecting mirror located in front of said laser and which partially reflects a portion of said beam back to said laser which cause said laser to generate a multimode beam;
• wherein a portion of said multimode beam is transmitted through said partially reflecting mirror;
• and
• an optical projection system which projects said multimode beam onto a screen.

A method of speckle reduction, the method comprising the steps of:

• placing an optical fiber in front of the output window of a semiconductor laser;
• inducing optical feedback in said laser, wherein the output of said laser is a multimode beam;
• directing said multimode beam into an optical projection system;
• projecting said multimode beam onto a projection surface, wherein the multimode beam has different speckle patterns that blend together.

A method of speckle reduction, the method comprising the steps of:

• placing a partially reflecting mirror in front of the output window of a laser;
• reflecting part of the output beam of said laser with said partially reflecting mirror back into said laser;
• inducing optical feedback in said laser, wherein the output of said laser is a multimode beam;
• directing said multimode beam towards an optical projection system;
• and
• projecting said multimode beam onto a projection surface, wherein the multimode beam has different speckle patterns that blend together.