Semiconductor laser diode module

A laser diode module comprising:

• a laser diode having an active layer;
• an optical system including an optical fiber and a lens portion, said optical system being configured to receive and transmit a beam emitted from said laser diode through said lens portion to said optical fiber along an optical axis;
• a holder configured to receive a portion of said optical system;
• and
• a base having a holder mounting member and a fastening member, said holder being mounted to said fastening member at a first joint position, said fastening member being mounted to said holder mounting member at a second joint position, said first joint position and said second joint position are coplanar with said active layer of said diode.

A laser diode module comprising:

• a laser diode;
• an optical system including an optical fiber and a lens portion, said optical system being configured to receive and transmit a beam emitted from said laser diode through said lens portion to said optical fiber along an optical axis;
• a holder configured to receive a portion of said optical system;
• and
• a base having a holder mounting member and a fastening member, said holder being mounted to said fastening member at a plurality of first joint positions, said fastening member being mounted to said holder mounting member at a plurality of second joint positions, said plurality of first joint positions and said plurality of second joint positions are coplanar.

A semiconductor laser diode module comprising:

• a laser diode;
• an optical system including an optical fiber and a lens portion, said optical system being configured to receive and transmit a beam emitted from said laser diode through said lens portion to said optical fiber along an optical axis;
• a holder configured to receive a portion of said optical system;
• a fastening means for fixing said portion of said optical system by supporting and clamping said holder on sides thereof;
• a base configured to support said fastening means and said laser diode, said base including a fastening means mounting member configured to mount said fastening means;
• and
• a bottom plate configured to support said base, said fastening means, said holder, said optical system, and said laser diode,
• wherein a first welding position is obtained by welding said fastening means to said fastening means mounting member, a second welding position is obtained by welding said fastening means and said holder, and a third welding position is obtained by welding said fastening means and said holder, and
• wherein said first welding position, said second welding position, and said third welding position are at substantially a same height in a direction perpendicular to said bottom plate.