Laser diode device and production method

A system, comprising:

• at least two adjacently situated laser diode devices, each including:
• at least one laser diode, the laser diode being an edge emitter, and
• a housing having a transparent optical window, the transparent optical window being configured as a first side wall of the housing, and the housing being configured to shield hermetically, the laser diode from an external environment of the laser diode device, the transparent optical window being configured to transmit at least one laser beam generated by the laser diode into the external environment, the laser diode being at least indirectly fastened to a base of the housing, wherein side walls of the housing and a housing cover situated opposite the housing base are developed from at least three wafers and
• an optical detector, a second one of the at least two adjacently situated laser diode devices being provided with a mirror surface on an outer side of a second side wall of the housing of the second laser diode device, and the mirror surface is aligned in such a way relative to a first one of the at least two adjacently situated laser diode devices that the at least one laser beam emitted by the laser diode of the first laser diode device is deflected by the mirror surface in a direction of the optical detector.

A method for producing a laser diode device, the method comprising the following steps:

• providing a second silicon wafer;
• producing a through hole having a rectangular cross-section, within the second silicon wafer using a first etching step, using KOH etching or trench etching;
• providing a first silicon wafer;
• connecting the first silicon wafer and second silicon wafer in such a way that the first silicon wafer seals the produced through hole on an underside of the second silicon wafer;
• providing a glass wafer;
• connecting the second silicon wafer and the glass wafer in such a way that the glass wafer seals the produced through hole on a topside of the second silicon wafer;
• separating a wafer stack including the first silicon wafer, the second silicon wafer, and the glass wafer along a separation plane, the separation plane extending along a main extension direction of the through hole;
• and
• connecting a carrier substrate to the first silicon wafer, the second silicon wafer, and the glass wafer in such a way that a laser diode developed on an outer side of the carrier substrate as an edge emitter is situated within a housing defined by the carrier substrate, the first silicon wafer, the second silicon wafer, and the glass wafer.

A method for ascertaining a tightness of a housing of a laser diode device, the laser diode device including at least one laser diode, the laser diode being an edge emitter, and a housing having a transparent optical window, the transparent optical window being configured as a first side wall of the housing, and the housing being configured to shield hermetically, the laser diode from an external environment of the laser diode device, the transparent optical window being configured to transmit at least one laser beam generated by the laser diode into the external environment, the laser diode being at least indirectly fastened to a base of the housing, wherein side walls of the housing and a housing cover situated opposite the housing base are developed from at least three wafers, and wherein the housing cover has at least one second recess, the method comprising the following steps:

• connecting a carrier substrate to the first silicon wafer, the second silicon wafer, and the glass wafer in such a way that a defined internal pressure is generated within the housing defined by the carrier substrate, the first silicon wafer, the second silicon wafer, and the glass wafer, the internal pressure having a pressure differential from the ambient pressure, and
• measuring a deflection of the housing cover;
• and
• ascertaining the tightness of the housing as a function of the measured deflection.

A method for ascertaining an optical function of a first laser diode of a system, wherein the method comprises the following steps:

• emitting at least one laser beam using a first laser diode situated within a first housing of a first laser diode device;
• deflecting the emitted laser beam onto an optical detector using a mirror surface provided on an outer side of a side wall of a second housing of a second laser diode device, the first and second laser diode devices being situated next to one another;
• and
• ascertaining the optical function of the first laser diode as a function of an intensity distribution and/or a brightness and/or a wavelength, of the deflected laser beam, using the optical detector.