Highly tunable, high power, efficient terahertz source based on dual-frequency synchronous Thulium-doped fiber laser source

基于双频同步掺铥光纤激光源的高可调、高功率、高效太赫兹源

• 批准号: 283997287
• 负责人: Dr. Matthias Jäger, Ph.D.
• 金额: --
• 依托单位: Leibniz-Institut für Photonische Technologien (IPHT)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/283997287?language=en
• 关键词: Highly; tunable; power; efficient; terahertz

Terahertz radiation (0.1 - 10 THz) has attracted great interest due to its unique properties, enabling many new applications in the security sector, biology, medicine, and in communications. While THz radiation is weakly absorbed by non-metallic non-polarizing materials, it acts non-ionizing on biological tissue and interacts with many molecules, resulting in readily identifiable absorption peaks. These remarkable properties make THz spectroscopy and multi-spectral imaging very promising and powerful techniques for analyzing substances, materials, devices and products.Even if first commercial systems emerge, large efforts in THz source developments are still required for fully exploiting the properties of THz waves in daily applications. So far, none of numerous THz generation techniques provides a source, which is simultaneously compact, highly efficient (high power), broadly tunable, and works at room temperature. THz sources based on difference frequency generation (DFG) in a nonlinear crystal pumped by diode pumped fiber laser systems are highly attractive since they combine power scalability with the inherent advantages of fiber-integrated setups. However this powerful approach has not been merged yet with frequency tunability essential for THz spectroscopy and multi-spectral imaging applications.This ambitious project aims to tackle this bottleneck by exploiting a novel fiber laser architecture developed by IPHTs and XLIMs expertise in innovative designs for high-power fiber lasers and amplifiers. Using a configurable fiber Bragg grating array with tailored tuning characteristics, the IPHT has recently demonstrated a record tuning bandwidth (74nm in the Yb band) in an electronically tunable nanosecond fiber laser. In a novel resonator design, the IPHT has enhanced this principle towards spectrally independent pulse round trip times enabling a unique dual-frequency operation regime. For the first time, a single fiber-integrated resonator enables a synchronous emission of 2 pulses with tunable emission wavelengths. Together with novel Very Large Mode Area active fibers developed by XLIM, exhibiting unique confinement properties for high power single transverse mode amplifiers while suppressing nonlinear distortions in the system, these techniques enable a pulsed broadly tunable high-power THz source using DFG in a nonlinear crystal.TERATUNE aims to exploit this concept based on a Tm-doped fiber laser and amplifier scheme for developing two classes of high-power THz sources: (i) continuously tunable over the frequency range 0.3 - 1 THz adapted to most THz applications, (ii) discretely tunable covering almost the entire THz regime. The success of this ambitious project demands a high-level of scientific expertise in, photonic technology, specialty laser architecture and novel fibers for ultra-high power optical amplifier systems. These skills come together in the collaboration of IPHT and XLIM with complementary competences.

太赫兹辐射（0.1 - 10 THz）由于其独特的特性引起了人们的极大兴趣，使安全部门，生物学，医学和通信中的许多新应用成为可能。虽然THz辐射被非金属非偏振材料弱吸收，但它对生物组织起非电离作用，并与许多分子相互作用，导致容易识别的吸收峰。 THz光谱学和多光谱成像技术是一种非常有前途的分析物质、材料、器件和产品的有力技术，即使第一个商业系统出现，要充分利用THz波的特性在日常应用中发挥作用，仍需要在THz源的开发上付出巨大的努力。到目前为止，众多的太赫兹产生技术中没有一种提供同时紧凑、高效（高功率）、广泛可调谐并且在室温下工作的源。基于由二极管泵浦的光纤激光器系统泵浦的非线性晶体中的差频产生（DFG）的THz源是非常有吸引力的，因为它们将功率可缩放性与光纤集成装置的固有优点结合联合收割机。然而，这种强大的方法还没有与太赫兹光谱和多光谱成像应用所必需的频率可调谐性相结合。这个雄心勃勃的项目旨在通过利用IPHTs和XLIM在高功率光纤激光器和放大器创新设计方面的专业知识开发的新型光纤激光器架构来解决这一瓶颈。利用可配置的光纤布拉格光栅阵列与定制的调谐特性，IPHT最近已经证明了在电子可调谐纳秒光纤激光器中的记录调谐带宽（Yb波段74 nm）。在一种新型的谐振器设计中，IPHT增强了这一原理，使其具有频谱独立的脉冲往返时间，从而实现了独特的双频操作机制。第一次，一个单一的光纤集成谐振器能够同步发射2个具有可调发射波长的脉冲。结合XLIM开发的新型超大模场有源光纤，为高功率单横模放大器提供了独特的限制特性，同时抑制了系统中的非线性失真，TERATUNE的目标是利用这一概念，基于掺Tm光纤激光器和放大器方案，开发两类高功率THz源，功率THz源：（i）在0.3 - 1 THz的频率范围内连续可调谐，适用于大多数THz应用，（ii）离散可调谐，覆盖几乎整个THz范围。这个雄心勃勃的项目的成功需要高水平的科学专业知识，光子技术，专业激光架构和超高功率光放大器系统的新型光纤。这些技能在IPHT和XLIM的合作中相互补充。

项目成果

Dual-Wavelength fiber laser based on a theta ring cavity and an FBG array with tailored tuning range for THz generation

基于 θ 环腔和 FBG 阵列的双波长光纤激光器，具有针对太赫兹生成定制的调谐范围

• DOI: 10.1364/assl.2017.jm5a.35
• 发表时间: 2017
• 作者: T. Tiess;M. Sabra;M. Becker;M. Rothhardt;G. Humbert;P. Roy;H. Bartelt;M. Jäger
• 通讯作者: M. Jäger

Flexible tuning concept for fiber-integrated lasers featuring multi-wavelength emission with fast switching speeds for DIAL

光纤集成激光器的灵活调谐概念，具有多波长发射和 DIAL 快速切换速度

• DOI: 10.1117/12.2529150
• 发表时间: 2019
• 作者: T. Tiess;M. Becker;M. Rothhardt;Hartmut Bartelt;M. Jäger
• 通讯作者: M. Jäger

Widely Tunable Dual-Wavelength Fiber Laser in the 2 μm Wavelength Range

• DOI: 10.1109/jlt.2019.2902076
• 发表时间: 2019-05-15
• 期刊: JOURNAL OF LIGHTWAVE TECHNOLOGY
• 影响因子: 4.7
• 作者: Sabra, Mostafa;Leconte, Baptiste;Roy, Philippe
• 通讯作者: Roy, Philippe

Tunable all-fiber PM lasers with single-and dual-wavelength emission and extended tuning range at 1μm and 2μm

可调谐全光纤保偏激光器，具有单波长和双波长发射以及 1μm 和 2μm 的扩展调谐范围

• DOI: 10.1364/sof.2018.soth2h.4
• 发表时间: 2018
• 作者: T. Tiess;M. Becker;M. Rothhardt;Hartmut Bartelt;M. Jäger
• 通讯作者: M. Jäger

Tunable fiber laser concepts in the 2µm spectral range for tunable dual wavelength emission

2μm 光谱范围内的可调谐光纤激光器概念，用于可调谐双波长发射

• DOI: 10.1117/12.2559948
• 发表时间: 2020
• 作者: T. Tiess;A. Hartung;M. Becker;M. Rothhardt;R. Dauliat;B. Leconte;G. Humbert;P. Roy;M. Jäger
• 通讯作者: M. Jäger