Surface mount device type laser module
A surface mount device type laser module includes a housing, an edge-emitting type laser diode unit, a reflective optical component and a base. The base is accommodated within the housing, and the edge-emitting type laser diode unit is integrated into the base. The base includes at least one surface transmission structure. The at least one surface transmission structure is exposed outside the base and the housing. An electronic signal is transmitted through the at least one surface transmission structure. A laser beam provided by the edge-emitting type laser diode unit is reflected by the reflective optical component, and the reflected laser beam is transmitted through an opening of the housing.
1. A surface mount device type laser module, comprising:
a housing having an opening;
a base accommodated within the housing and comprising at least one surface transmission structure, wherein the at least one surface transmission structure is a contact pad which is exposed outside the base and the housing, and at least one electronic signal is transmitted through the at least one surface transmission structure;
an edge-emitting type laser diode unit fixed on the base and providing at least one laser beam; and
a reflective optical component;
a photodiode unit disposed on or outside the base, wherein the edge-emitting type laser diode unit is arranged between the reflective optical component and the photodiode unit;
wherein a first portion of the at least one laser beam is projected on the reflective optical component and then is reflected through the opening of the housing by the reflective optical component, and a second portion of the at least one laser beam is projected on the photodiode unit so as to be detected by the photodiode unit.
2. The surface mount device type laser module according to claim 1 , wherein the photodiode unit is disposed outside the base, and the surface mount device type laser module further comprises an optical guide element, wherein the at least a portion of the at least one laser beam is guided by the optical guide element and projected on the photodiode unit.
3. The surface mount device type laser module according to claim 1 , further comprising at least one optical element, wherein the edge-emitting type laser diode unit is arranged between the base and at least one optical element, wherein after the first portion of the at least one laser beam is reflected by the reflective optical component, the first portion of the at least one laser beam is optically processed by the at least one optical element.
4. The surface mount device type laser module according to claim 3 , wherein a center of the laser beam of the first portion of the at least one laser beam is emitted from a center position of a lighting zone of the edge-emitting type laser diode unit, wherein after the center of the laser beam is projected on the reflective mirror, the center of the laser beam is reflected vertically and propagated in a direction toward an optical center of the at least one optical element.
5. The surface mount device type laser module according to claim 3 , wherein the at least one optical element comprises a collimator optical element, wherein after the first portion of the at least one laser beam is reflected by the reflective optical component, the first portion of the at least one laser beam is collimated by the collimator optical element.
6. The surface mount device type laser module according to claim 5 , wherein the at least one optical element further comprises a diffractive optical element, wherein after the first portion of the at least one laser beam is transmitted through the collimator optical element, the first portion of the at least one laser beam is shaped by the diffractive optical element and projected out.
7. The surface mount device type laser module according to claim 6 , wherein a distance between a first optical axis of the collimator optical element and a second optical axis of the diffractive optical element is smaller than 0.2 mm.
8. The surface mount device type laser module according to claim 5 , wherein the collimator optical element has an effective focal length f, wherein 0.5 mm<f<3 mm.
9. The surface mount device type laser module according to claim 5 , wherein the collimator optical element has a numerical aperture N.A., wherein N.A.<0.6.
10. The surface mount device type laser module according to claim 5 , wherein the reflective optical component comprises a reflective mirror.
11. The surface mount device type laser module according to claim 6 , wherein an angle between a first optical axis of the collimator optical element and a second optical axis of the diffractive optical element is smaller than 2.5 degrees.
12. The surface mount device type laser module according to claim 6 , wherein the collimator optical element and the diffractive optical element are connected with each other.
13. The surface mount device type laser module according to claim 3 , wherein the at least one optical element is coated with an anti-reflection coating.
14. The surface mount device type laser module according to claim 1 , further comprising a second edge-emitting type laser diode unit and a second reflective optical component, wherein the edge-emitting type laser diode unit and the second edge-emitting type laser diode unit provide the at least one laser beam, wherein after the at least one laser beam is reflected by at least one of the reflective optical component and the second reflective optical component, the reflected laser beam is transmitted through the opening of the housing.
15. The surface mount device type laser module according to claim 1 , wherein the edge-emitting type laser diode unit comprises plural laser diode chips, wherein the plural laser diode chips provide plural laser beams.