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High power VCSEL with improved spatial mode

A laser cavity, concave surface technology, applied in the visual representation of photographic printing, visual presentation with printers, laser parts, etc., can solve the problems of complexity, added complexity to the production process, expensive alignment process, etc.

Inactive Publication Date: 2011-11-16
TRUMPF PHOTONIC COMPONENTS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore using VECSEL instead of VCSEL adds complexity to the production process
The very small tolerances in the alignment of the outer mirror relative to the semiconductor device require a complex alignment and production process of the individual VECSEL diodes, and thus an even more complex and thus more expensive alignment process when forming arrays of VECSEL diodes

Method used

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  • High power VCSEL with improved spatial mode
  • High power VCSEL with improved spatial mode
  • High power VCSEL with improved spatial mode

Examples

Experimental program
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Effect test

Embodiment Construction

[0022] figure 1 A schematic diagram of a first example of the proposed VCSEL device is shown. In this embodiment, weak feedback is achieved by a curved mirror spaced apart from VCSEL1, which is only figure 1is schematically shown in . The confinement layer 2 on the upper DBR of the VCSEL 1 forms an aperture for the emitted laser radiation, the laser beam 6 being indicated in the figure. The optical element forming the reflective surface for feedback in this example is a coated microlens 4 . The coating can be as Ta 2 o 5 and SiO 2 or a stack of suitable dielectric layers of similar material. This microlens 4 is attached to a glass block 3 with a thickness of 200 μm. The air gap between VCSEL1 and this glass block 3 is 3 mm. The microlenses are coated such that the inner surface 5 has a reflectivity of 30% for the laser radiation, so that 30% of the laser radiation emitted by the VCSEL1 is fed back into the laser cavity. This improves and stabilizes the spatial mode di...

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PUM

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Abstract

The present invention relates to a VCSEL device comprising an optical gain medium (8) arranged between a first DBR (9) and a second DBR (7). The first and the second DBR form a laser cavity and are designed to allow self-contained lasing in the laser cavity, said second DBR (7) being partially transparent for laser radiation resonating in the laser cavity. An optical element is arranged on a sideof the second 5 DBR (7) outside of the laser cavity on the optical axis of the laser cavity. The optical element has a concave surface (5) facing the second DBR (7) and being designed to reflect a portion of laser radiation emitted through the second DBR (7) back into the laser cavity. The ratio R / d of the radius of curvature R of the concave surface (5) and the distance d between the concave surface (5) and the gain medium (8) is in the range 10 between 1 and 2. With the proposed VCSEL device a high power output with an improved mode distribution and mode stabilization is achieved.

Description

technical field [0001] The present invention relates to a vertical cavity surface emitting laser (VCSEL) comprising: an optical gain medium arranged between a first distributed Bragg reflector (DBR) and a second distributed Bragg reflector, said first A DBR and the second DBR form a laser cavity and are designed to allow self-contained laser emission in the laser cavity, and the second DBR is sensitive to laser radiation resonant in the laser cavity is partially transparent; and an optical element disposed on the side of the second DBR outside the laser cavity on the optical axis of the laser cavity, the optical element having a concave surface facing the second DBR And the concave surface is designed to reflect a part of the laser radiation passing through the second DBR back into the laser cavity. [0002] VCSEL devices emitting in the infrared wavelength range are quite common in optical communication applications. The laser cavity of such a VCSEL device comprises two sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/065H01S5/183H01S5/42B41J2/455G06K15/12
CPCH01S5/0207H01S5/0656H01S5/18388B41J2/451H01S5/423H01S5/18347
Inventor J.S.科尔布M.米勒S.温特施泰因U.恩斯特
Owner TRUMPF PHOTONIC COMPONENTS GMBH