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Laser unit with reduced back reflection

A technology of lasers and lasers, applied in the field of laser units, can solve the problems of reducing polarization rotation, multi-optical noise, etc., and achieve the effects of eliminating anti-reflection, reducing thermal influence, and reducing interference phenomena

Inactive Publication Date: 2013-03-27
AXETRIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This greatly reduces the advantage of polarization rotation and can lead to even more optical noise

Method used

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  • Laser unit with reduced back reflection
  • Laser unit with reduced back reflection
  • Laser unit with reduced back reflection

Examples

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Embodiment Construction

[0039] figure 1 A laser unit 1 is shown, preferably for gas detection, having a closed hermetic housing (not shown in the figure) with an exit window for the laser beam, in which housing a semiconductor laser chip 2 is arranged. In the area of ​​the exit region 10 for the laser beam 9, the semiconductor laser chip 2 carries a λ / 4 plate 3, which is bonded with an adhesive layer 5 as an optical medium made of an adhesive. The output mirror 6 of the semiconductor laser chip 2 is connected. The λ / 4 plate 3 is flat, like the adhesive layer 5 through which the λ / 4 plate 3 is attached to the plane 7 of the semiconductor laser chip 2 including the exit region 10 . The adhesive layer 5 extends over the entire exit region 10 . The adhesive layer 5 connecting the output mirror 6 and the self-mixing-reducing optical element 3 has the same refractive index as the self-mixing-reducing optical element 3 . At a distance from the λ / 4 plate 3, an optional microlens 4 is arranged, which is at...

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Abstract

Laser unit (1), preferably for gas detection, comprises a semiconductor laser chip (2), and optionally a beam-shaping element (4) capable of shaping a laser beam (9) emitted to a semiconductor laser chip (2). The semiconductor laser chip (2) and the beam-shaping element (4) are all optionally sealed in an enclosed housing for an exit window of the laser beam (9). An optical element (3) with reduced self-mixing is disposed in an outgoing area (10) of the semiconductor laser chip (2) for direct physic contact, and is at least in the outgoing area (10) connected to a laser machine chip or is connected by means of an optical medium. In a replaced embodiment, an output reflector (6) can be firstly applied in the optical element (3) with reduced self-mixing, and will be preferably connected to a VCSEL semi-laser chip by means of wafer bonding in the following steps.

Description

technical field [0001] The invention relates to a laser unit with a semiconductor laser chip comprising an output mirror with an exit area for a laser beam primarily intended for gas detection, but which can also be used in other fields of application, e.g. Used in telecommunications and to reduce and / or suppress back reflections of laser light entering the laser's exit region. Background technique [0002] Due to the numerous tasks in the sectors of safety, convenience and environmental protection, there is a great demand for cost-effective, reliable and highly sensitive gas detectors. Known gas sensors frequently detect gases by means of absorption spectroscopy. For example, with this technique, a laser beam of suitable frequency is passed through a gas or gas mixture that at least partially absorbs the laser light. This frequency depends on the gas to be detected and is chosen to ensure the strongest possible interaction of the laser with the gas atoms and / or gas molecu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
CPCH01S5/005H01S5/183H01S5/026H01S5/0064
Inventor A.威特曼M.施图德R.普罗塔西奥C.弗拉希纳
Owner AXETRIS AG