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Variable wavelength surface emitting laser

A surface emission and laser technology, applied in the direction of lasers, laser components, semiconductor lasers, etc., can solve the problem of broadening the wavelength scanning range without paying attention

Inactive Publication Date: 2014-03-12
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this is intended to improve manufacturing yield without focusing on the broadening of the wavelength scanning range

Method used

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  • Variable wavelength surface emitting laser
  • Variable wavelength surface emitting laser
  • Variable wavelength surface emitting laser

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Embodiment Construction

[0032] The following will refer to figure 1 and figure 2 Exemplary embodiments of the present disclosure are described. One disclosed feature of an embodiment may be described as a process generally depicted as a sequence diagram. A timing diagram may show the timing relationships of several entities (such as signals, events, etc.). Although a sequence diagram may describe operations as a sequential process, some operations may be performed in parallel or simultaneously. Also, unless otherwise stated, the order of operations or timing moments may be rearranged. Furthermore, timings or distances in time may not be drawn to scale or depict timing relationships to exact scale.

[0033] figure 1 is a schematic diagram illustrating an example of a surface-emitting laser according to an exemplary embodiment.

[0034] figure 1 The surface-emitting laser shown in includes an optical resonant cavity, and includes a semiconductor layer (i.e., active layer 104) that emits ligh...

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Abstract

A surface emitting laser includes a first laser, and a second laser, wherein each of the first laser and the second laser includes a light resonant cavity including a pair of reflecting mirrors and a semiconductor layer configured to emit light and arranged inside the light resonant cavity, an oscillation wavelength of light can be varied by displacing a location of the reflecting mirror in a thickness direction of the semiconductor layer, the semiconductor layer is shared by the first laser and the second laser, the first laser has a resonant cavity length for oscillating with (n + 1)th order (n is an integer of 1 or more) of a longitudinal mode, the second laser has a resonant cavity length for oscillating with nth order of a longitudinal mode, and respective wavelength bands of light oscillated by the first laser the second laser are different. The monolithic array of VCSEL emitting at different wavelengths sharing the bottom mirror and spacer layers in the cavity. The cavity length can be adjusted by the dielectric mirrors being provided on a membrane with an air-gap.

Description

technical field [0001] One disclosed aspect of the embodiments relates to a surface-emitting laser whose oscillation wavelength of light can be changed. Background technique [0002] Various laser sources that can change the oscillation wavelength have been used in the fields of communication networks and inspection devices. [0003] High-speed switching of wavelengths is desired in the field of communication networks, and high-speed and wide wavelength scanning is desired in the field of inspection devices. [0004] Applications of variable wavelength (scanning) light sources for inspection devices include laser beam splitters, dispersion measurement instruments, film thickness gauges, and scanning source optical coherence tomography (SS-OCT) devices. [0005] Optical coherence tomography is an imaging technique for imaging a tomogram of an object using optical coherence. In recent years, much research into optical coherence tomography has been carried out in the medical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/42
CPCH01S5/06H01S5/4087H01S5/18341H01S5/0207H01S5/18369H01S5/18366G01N21/49H01S5/423H01S5/18358H01S5/18311H01S5/026G01B9/02007
Inventor 稻生耕久内田护
Owner CANON KK