Semiconductor laser diode package

1. A semiconductor laser diode package, comprising:

a stem having a first surface and a second surface opposing the first surface and including a through hole formed to extend from the first surface to the second surface at a predetermined position;

a heat sink projecting from the first surface of the stem and having a mounting surface connected to the through hole; and

a semiconductor laser diode mounted onto mounting surface of the heat sink such that a cavity length direction of the semiconductor laser diode coincides with the extending direction of the through hole,

wherein an end portion of the semiconductor laser diode is mounted within the through hole.

2. The package of claim 1 , further comprising a filling member that fills into the through hole part way in a thickness direction of the stem.

3. The package of claim 2 , wherein the filling member has a slanted surface adjacent to the semiconductor laser diode.

4. The package of claim 2 , wherein the filling member is made of an insulating or non-metal material.

5. The package of claim 4 , wherein the filling member is made of a light absorbing material.

6. The package of claim 1 , wherein the semiconductor laser diode has a cavity length greater than 1.5 mm.

7. The package of claim 1 , further comprising a photodiode receiving light that is emitted from a rear side of the semiconductor laser diode and passes through the through hole.

8. The package of claim 1 , further comprising a submount that is disposed between the semiconductor laser diode and the heat sink and transfers heat generated within the semiconductor laser diode to the heat sink.

9. The package of claim 1 , further comprising a cap that is attached to the first surface of the stem and seals the heat sink and the semiconductor laser diode.

10. The package of claim 9 , wherein the cap has a window transmitting light emitted from a front side of the semiconductor laser diode.

11. The package of claim 1 , further comprising a plurality of connecting pins that is fit into the second surface of the stem and electrically connects with the semiconductor laser diode.

12. The package of claim 1 , further comprising a filling member disposed in the through hole adjacent to the end portion of the semiconductor laser diode.

13. The package of claim 12 , wherein the filling member is configured to absorb light emitted from the end portion of the semiconductor laser diode.

14. The package of claim 13 , wherein the filling member allows a portion of the light emitted from the end portion of the semiconductor laser diode to pass through, the package further comprising a photodiode disposed in a vicinity of the through hole and behind the filling member, wherein the photodiode is configured to adjust an output power of the semiconductor laser diode based on the portion of the light emitted from the end portion of the semiconductor laser diode that passes through the filling member.

15. The package of claim 12 , wherein the filling member is configured to reflect the light emitted from the end portion of the semiconductor laser diode at a predetermined angle.

16. The package of claim 15 , wherein the filling member allows a portion the light emitted from the end portion of the semiconductor laser diode to pass through, the package further comprising a photodiode disposed in a vicinity of the through hole and behind the filling member, wherein the photodiode is configured to adjust an output power of the semiconductor laser diode based on the portion of the light emitted from the end portion of the semiconductor laser diode that passes through the filling member.

17. The package of claim 12 , further comprising a photodiode disposed in a vicinity of the through hole and behind the end portion of the semiconductor laser diode, wherein the photodiode is configured to adjust an output power of the semiconductor laser diode based on light emitted from the end portion of the semiconductor laser diode.

18. The package of claim 12 , further comprising a submount disposed between the semiconductor laser diode and the heat sink and configured to transfer heat generated from the semiconductor laser diode to the heat sink.