Method for measuring cavity mode split of vertical cavity surface emitting laser under room temperature condition

A vertical cavity surface emission and laser technology, which is applied in the direction of testing optical properties, can solve the problems of high equipment and cumbersome test steps, and achieve the effect of simple measurement equipment, avoiding errors, and high measurement accuracy

Inactive Publication Date: 2013-08-21
FUZHOU UNIV
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Problems solved by technology

However, the first two of these testing techniques have high requirements on equipment, while the latter testing procedures are more cumbersome

Method used

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  • Method for measuring cavity mode split of vertical cavity surface emitting laser under room temperature condition
  • Method for measuring cavity mode split of vertical cavity surface emitting laser under room temperature condition
  • Method for measuring cavity mode split of vertical cavity surface emitting laser under room temperature condition

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Embodiment Construction

[0034] The invention provides a method for measuring cavity mode splitting of a vertical cavity surface emitting laser at room temperature, comprising the following steps:

[0035] S01: Provide a vertical cavity surface emitting laser, and sequentially arrange two focusing lenses, a photoelastic modulator, a polarizer, a monochromator and a detector on the optical path of the vertical cavity surface emitting laser;

[0036] S02: providing a pulsed current source to inject forward current into the vertical cavity surface emitting laser;

[0037] S03: adjusting the size of the light entrance slit of the monochromator;

[0038] S04: A controller providing a photoelastic modulator controls the photoelastic modulator to set a wavelength value and a phase delay value;

[0039] S05: providing a computer to control the monochromator to perform wavelength scanning;

[0040] S06: Provide a data acquisition card for the light intensity value I obtained by the detector under a group of ...

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Abstract

The invention relates to a method for measuring a cavity mode split of a vertical cavity surface emitting laser under the room temperature condition. According to the method for measuring the cavity mode split of the vertical cavity surface emitting laser under the room temperature condition, laser light emitted by the vertical cavity surface emitting laser is modulated through an optical elastic modulator, the light intensity difference between two laser emitting modes which are modulated by the optical elastic modulator and are polarized in the direction of two perpendicular optical main shafts is included in the light intensity signals detected by a photoelectric detector, optical spectra of the two laser emitting modes which are polarized in the direction of the two perpendicular optical main shafts of the VCSEL can be extracted by changing the phase modulation amplitude phi 0 (actually the value of the phi 0 just needs to be changed two times) of a PEM, and then a cavity mode split value can be obtained. According to the method for measuring the cavity mode split of the vertical cavity surface emitting laser under the room temperature condition, the cavity mode split of the vertical cavity surface emitting laser can be accurately obtained under the room temperature condition by using a light spectrum system with an ordinary resolution ratio, measuring equipment is quite simple, and operation steps are simple. The method for measuring the cavity mode split of the vertical cavity surface emitting laser under the room temperature condition can be widely popularized and used in the future.

Description

technical field [0001] The invention relates to the technical field of characterization and measurement of vertical cavity surface emitting lasers, in particular to a method for measuring cavity mode splitting of vertical cavity surface emitting lasers at room temperature. Background technique [0002] Vertical-cavity surface-emitting lasers (VCSELs) have many advantages over edge-emitting lasers, such as low threshold current, easy implementation of single-mode operation, easy implementation of two-dimensional dense addressable arrays, circularly symmetrical far and near field distribution, and very Small beam launch angle, etc. Therefore, vertical-cavity surface-emitting lasers have attracted extensive attention in recent years. For a VCSEL device with ideal cylindrical symmetry grown on a (001) sphalerite semiconductor material substrate, the two modes of the zero-order transverse mode emitted by it are degenerate in energy and mutually opposite in polarization direction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
Inventor 俞金玲陈涌海程树英
Owner FUZHOU UNIV
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