SURFACE-EMISSION QUANTUM CASCADE LASER

• Main Authors: KANEKO KATSURA, YAMAMOTO YUICHIRO, SUMINO TSUTOMU, HASHIMOTO REI, SAITO SHINJI, TAKASE TOMOHIRO
• Format: Patent
• Language: English; Japanese
• Published: 13.06.2019
• Subjects: BASIC ELECTRIC ELEMENTS; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DEVICES USING STIMULATED EMISSION; ELECTRICITY; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

To provide a surface-emission quantum cascade laser capable of emitting two kinds of IR (infrared) laser light.SOLUTION: A surface-emission quantum cascade laser comprises: a substrate; an active layer; and a photonic crystal layer. The photonic crystal layer has: a first region where an optically anisotropic rectangular grating is provided; and a second region where a rectangular grating is provided. In the first region, a first IR laser light having a first wavelength corresponding to the highest gain outside a photonic band gap of a direction in parallel with a first side of the rectangular grating is oscillated in the direction in parallel with the first side. In the second region, a second IR laser light having a second wavelength corresponding to the highest gain outside a photonic band gap of a direction in parallel with a second side of the rectangular grating is oscillated in the direction in parallel with the second side. The first IR laser light can be present in the second region. The first IR laser light and second IR laser light are emitted in a direction mostly perpendicular to the active layer.SELECTED DRAWING: Figure 1 【課題】２つの赤外レーザ光を放出可能な面発光量子カスケードレーザを提供する。【解決手段】面発光量子カスケードレーザは、基板と、活性層と、フォトニック結晶層と、を有する。フォトニック結晶層は、光学異方性を有する直方格子が設けられた第１領域と直方格子が設けられた第２領域とを有する。第１領域において、直方格子の第１辺に平行な方向のフォトニックバンドギャップの外側で最も高いゲインに相当する第１波長を有する第１の赤外レーザ光が第１辺に平行な方向に発振する。第２領域において、直方格子の第２辺に平行な方向のフォトニックバンドギャップの外側で最も高いゲインに相当する第２波長を有する第２の赤外レーザ光が第２辺に平行な方向に発振する。第１の赤外レーザ光は、第２領域内に存在可能である。第１および第２の赤外レーザ光は、活性層に対して概ね垂直方向に放出される。【選択図】図１