Diode laser-based thermometry using two-line atomic fluorescence of indium and gallium [0.03%]
基于半导体激光器的两条原子荧光测温技术
Jesper Borggren,Wubin Weng,Ali Hosseinnia et al.
Jesper Borggren et al.
A robust and relatively compact calibration-free thermometric technique using diode lasers two-line atomic fluorescence (TLAF) for reactive flows at atmospheric pressures is investigated. TLAF temperature measurements were conducted using i...
L Cini,J I Mackenzie
L Cini
Fundamentally power-limited by thermal effects, the design challenge for end-pumped "bulk" solid-state lasers depends upon knowledge of the temperature gradients within the gain medium. We have developed analytical expressions that can be u...
Mid-infrared sensing of CO at saturated absorption conditions using intracavity quartz-enhanced photoacoustic spectroscopy [0.03%]
基于石英增强光声光谱的饱和吸收条件下的CO气体中红外检测研究
Jakob Hayden,Bettina Baumgartner,Johannes P Waclawek et al.
Jakob Hayden et al.
The sensitivity of quartz-enhanced photoacoustic spectroscopy (QEPAS) can be drastically increased using the power enhancement in high-finesse cavities. Here, low noise resonant power enhancement to 6.3 W was achieved in a linear Brewster w...
A portable miniaturized laser heterodyne radiometer (mini‑LHR) for remote measurements of column CH4 and CO2 [0.03%]
一种便携式小型激光heterodyne辐射计（Mini-LHR），用于远程测量CH4和CO2的柱总量
E L Wilson,A J DiGregorio,G Villanueva et al.
E L Wilson et al.
We present the design of a portable version of our miniaturized laser heterodyne radiometer (mini-LHR) that simultaneously measures methane (CH4) and carbon dioxide (CO2) in the atmospheric column. The mini-LHR fits on a backpack frame, ope...
Fiber laser-driven gas plasma-based generation of THz radiation with 50-mW average power [0.03%]
基于光纤激光驱动的气体等离子体THz辐射源实现50毫瓦平均功率输出
Joachim Buldt,Michael Mueller,Henning Stark et al.
Joachim Buldt et al.
We present on THz generation in the two-color gas plasma scheme driven by a high-power, ultrafast fiber laser system. The applied scheme is a promising approach for scaling the THz average power but it has been limited so far by the driving...
Flame thermometry using laser-induced-grating spectroscopy of nitric oxide [0.03%]
基于激光诱导 grating 的 NO 光谱的火焰温度测量技术
Andrew Luers,Anna-Lena Salhlberg,Simone Hochgreb et al.
Andrew Luers et al.
A systematic study of laser-induced thermal-grating scattering (LITGS) using nitric oxide as an absorbing species is presented as a means of thermometry in air-fed combustion. The relative contributions to the scattered signal from degenera...
Dispersive white light continuum single Z-scan for rapid determination of degenerate two-photon absorption spectra [0.03%]
用于快速确定退化两光子吸收光谱的发散白光连续Z扫描技术
Aliasghar Ajami,Wolfgang Husinsky,Aleksandr Ovsianikov et al.
Aliasghar Ajami et al.
We present an experimental technique to determine the degenerate two-photon absorption (2PA) spectra by performing a single Z-scan using a high-spectral-irradiance white light continuum (WLC) generated by a hollow core fiber. The hollow fib...
Kana Iwakuni,Gil Porat,Thinh Q Bui et al.
Kana Iwakuni et al.
Long-wavelength mid-infrared (MIR) frequency combs with high power and flexible tunability are highly desired for molecular spectroscopy, including investigation of large molecules such as C60. We present a high power, phase-stabilized freq...
Highly efficient frequency doubling and quadrupling of a short-pulsed thulium fiber laser [0.03%]
高效产生THz的短脉冲铥纤维激光频率倍增和四重频效应研究
Lin Xu,Sijing Liang,Qiang Fu et al.
Lin Xu et al.
We report the second harmonic generation and fourth harmonic generation of the output from a short-pulsed (~ 80 ps) thulium-doped fiber laser, generating 976 and 488 nm wavelengths with high efficiency. With a narrow-linewidth (0.5 nm) pump...
Ben Henderson,Amir Khodabakhsh,Markus Metsälä et al.
Ben Henderson et al.
Detection and analysis of volatile compounds in exhaled breath represents an attractive tool for monitoring the metabolic status of a patient and disease diagnosis, since it is non-invasive and fast. Numerous studies have already demonstrat...