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External-cavity quantum cascade laser

A laser and laser technology, applied in the direction of lasers, phonon exciters, laser components, etc., to achieve the effect of eliminating mechanical instability

Pending Publication Date: 2020-12-04
简 F 基施卡特
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] The problem according to the invention is solved by a laser according to claim 1 and a method for filtering out-of-band laser modes of a laser according to the invention according to claim 15

Method used

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  • External-cavity quantum cascade laser
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Embodiment Construction

[0246] Fig. 1 shows a Fabry-Perot filter 100 which is part of a wavelength selective interference filter 1 according to the invention. Figure 1a A top view of the Fabry-Perot filter 100 is shown, Figure 1b shows its isometric view, Figure 1c A cross-sectional view thereof is shown. Figure 1d A cross-sectional view of a symmetrically suspended Fabry-Perot filter 100 with mirror elements 101 and 102 is shown.

[0247] The Fabry-Perot filter 100 is a miniature, micromechanical and preferably electrostatically tuned mid-infrared Fabry-Perot type bandpass interference filter 100 comprised of a suitable MIR filter such as silicon or germanium. A first mirror element 101 with a first highly reflective layer 103 and a second mirror element 102 with a second high reflective layer 104 on a transparent substrate 107, the first mirror element and the second mirror element face each other, in There is an air-filled or evacuated gap (cavity) 106 between them, and the gap 106 can be a...

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Abstract

The invention relates to a wavelength-switchable, semiconductor laser (10), for generating of laser light in the optical range between 1 microns and 100 microns, wherein the laser (10) comprises an external cavity (11) and at least the following components: a semiconductor optical amplifier (12), comprising an intra-cavity facet (121) facing towards a first optical element (13) for collimating a laser beam exiting the intra-cavity facet (121) arranged at the intra-cavity facet (121) of the semiconductor optical amplifier (12), - a transmissive, wavelength-adjustable interference filter (1), comprising at least i) a wavelength-adjustable Fabry-Perot filter (100) and ii) a Fabry-Perot etalon (110) comprising a first planar surface (111) and a second planar (112) surface, wherein the first and second surface (111, 112) of the etalon (110) are arranged opposite and plane-parallel to each other and delimit an etalon cavity (113), wherein the Fabry-Perot etalon (110) and the Fabry-Perot filter (100) are arranged in a row, wherein the interference filter (1) is arranged between the first optical element (13) and the beam splitter (14), and wherein the components are arranged such that laser light comprising a selected laser wavelength can stably resonate in the external cavity, wherein an on-axis, retro-reflecting beam splitter (14) is arranged at one end of the external cavity (11).Furthermore, the invention relates to a method for selecting a laser wavelength using the laser.

Description

technical field [0001] The invention relates to a wavelength tunable laser including a wavelength tunable filter. Furthermore, the invention relates to a method for filtering out-of-band laser modes using a laser according to the invention. Background technique [0002] Since its first experimental demonstration in 1994 [1], quantum cascade lasers (QCLs) have become desirable in the mid-infrared (MIR) region with interband diode lasers in the visible (VIS) and near-infrared (NIR) ranges. Leading candidates of similar technical significance [2]. While VIS and NIR provide the most suitable ranges for long-range communications and illumination, MIR contains the infrared atmospheric window and the so-called fingerprint region of many molecules [3], which is promising for ultrasensitive and affordable MIR spectroscopy—for example with Biomarker detection for various health conditions. [0003] Fixed wavelength QCLs are known in the prior art, eg Distributed Feedback (DFB) QCLs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/14H01S5/34H01S5/065H01S5/022H01S5/028H01S5/10H01S5/024
CPCH01S5/0222H01S5/02415H01S5/02476H01S5/0287H01S5/0654H01S5/1085H01S5/141H01S5/3402H01S2302/02H01S5/02325H01S5/3401
Inventor 简·F·基施卡特
Owner 简 F 基施卡特
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