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Wavelength sweepable laser source

A laser source and wavelength technology, applied in the direction of lasers, laser components, semiconductor lasers, etc., can solve problems such as dynamic lamination instability and limited tuning range, and achieve the effect of avoiding dynamic pull-in instability

Active Publication Date: 2015-05-20
DANMARKS TEKNISKE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Static fit instabilities can be surpassed by repeated sweeps, but dynamic fit instabilities will still limit tuning range

Method used

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  • Wavelength sweepable laser source
  • Wavelength sweepable laser source
  • Wavelength sweepable laser source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0060] figure 1 A schematic cross-sectional view of a laser source 100 according to an embodiment of the laser source disclosed herein is shown in . The embodiment shown here is a vertical cavity surface emitting laser (VCSEL) and includes a bottom (first) reflector in the form of a distributed Bragg reflector (DBR) 102 and a top (second) high index reflector surrounded by air. Contrast with a wavelength grating (HCG) 104 . The second reflector is elastically mounted to the structure by means of a suspension 120 comprising microelectromechanical systems (MEMS). By applying a voltage between a first MEMS contact 106, which doubles as the anode of the intracavity laser, and a second MEMS contact 108, close to the second reflector, a of electrostatic force. Since the electrostatic force can only attract and thus not repel the first reflector, the cavity defined by these two reflectors can only be shortened by static tuning. It is known that with static electrostatic tuning, t...

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PUM

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Abstract

Wavelength sweepable laser source is disclosed, wherein the laser source is a semiconductor laser source adapted for generating laser light at a lasing wavelength. The laser source comprises a substrate, a first reflector, and a second reflector. The first and second reflector together defines an optical cavity, and are arranged to support light oscillation in the optical cavity along an optical path in a direction normal to the substrate. The optical cavity comprises a void in the optical path. The second reflector is resiliently suspended by a suspension in a distance from the first reflector and having a rest position, the second reflector and suspension together defining a microelectromechanical MEMS oscillator. The MEMS oscillator has a resonance frequency and is adapted for oscillating the second reflector on either side of the rest position. The laser source further comprises electrical connections adapted for applying an electric field to the MEMS oscillator. Furthermore, a laser source system and a method of use of the laser source are disclosed

Description

technical field [0001] The present disclosure relates to wavelength sweepable laser sources, laser source systems, and methods of using laser sources. Background technique [0002] In many applications such as spectroscopy and spectral interferometry, wavelength-tunable light sources with wide optical bandwidth and fast tuning speed are required. In many such applications, the spectral purity of the light source is important in order to avoid spurious signals such as a reduction in perceived dynamic coherence length. [0003] Wavelength tunable laser sources such as tunable vertical cavity surface emitting lasers (VCSELs) are attractive for many applications such as spectroscopy and optical coherence tomography (OCT). Microelectromechanical systems (MEMS) tunable vertical-cavity surface-emitting diodes (VCSELs) have the potential to enable true single-mode wavelength tuning with greater than 10% relative tuning range and / or at frequencies up to 100 MHz Single-mode waveleng...

Claims

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Application Information

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IPC IPC(8): H01S5/183H01S5/022H01S5/10H01S5/34
CPCH01S5/0222H01S5/18311H01S5/18366H01S5/18383H01S5/18386H01S5/18397H01S5/3406H01S2301/17B82Y20/00H01S5/1096H01S5/0687H01S5/18313H01S5/3013H01S5/34313
Inventor 克雷斯滕·温德托尔·安斯贝克郑一硕奥勒·汉森
Owner DANMARKS TEKNISKE UNIV
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