B2Σ+ state lifetime in CO+

1998 ◽  
Vol 76 (1) ◽  
pp. 39-46 ◽  
Author(s):  
T J Scholl ◽  
S D Rosner ◽  
R A Holt
Keyword(s):  
Laser Beam ◽  
Systematic Error ◽  
Laser Induced Fluorescence ◽  
Single Frequency ◽  
Laser Method ◽  
Negative Band ◽  
Beam Laser ◽  
Excitation Region ◽  
Frequency Laser

We measured the lifetime of the B2Σ+, v = 0 level of the astrophysically important CO+ molecule by applying the collinear beam-laser method. Ions in the long-lived A2Π level were excited to the B2Σ+ state by a single-frequency laser beam in resonance with a transition in the B2Σ+ – A2Π Baldet–Johnson band, and the laser-induced fluorescence from the B2Σ+ – X2Σ+ First Negative band was monitored as a function of distance from the excitation region. We claim that our result of 54.9 ± 0.7 ns is less likely to have suffered from systematic error than previous measurements, which were mutually discordant. PACS No. 33.70Ca

Direct observation of Ba+ velocity distributions in a drift tube using single‐frequency laser‐induced fluorescence

1987 ◽  
Vol 87 (9) ◽  
pp. 5578-5579 ◽  
Author(s):  
Rainer A. Dressler ◽  
Henning Meyer ◽  
Andrew O. Langford ◽  
Veronica M. Bierbaum ◽  
Stephen R. Leone
Keyword(s):  
Direct Observation ◽  
Drift Tube ◽  
Laser Induced Fluorescence ◽  
Single Frequency ◽  
Frequency Laser

Fast-ion-beam laser-induced-fluorescence measurements of spontaneous-emission branching ratios and oscillator strengths in Sm II

2006 ◽  
Vol 84 (8) ◽  
pp. 723-771 ◽  
Author(s):  
S J Rehse ◽  
R Li ◽  
T J Scholl ◽  
A Sharikova ◽  
R Chatelain ◽  
...  
Keyword(s):  
Spontaneous Emission ◽  
Transition Probabilities ◽  
Ion Beam ◽  
Branching Ratios ◽  
Oscillator Strengths ◽  
Single Frequency ◽  
Beam Laser ◽  
Fluorescence Measurements ◽  
Frequency Laser ◽  
Fast Ion

We measured the spontaneous-emission branching ratios of 69 levels in Sm II selectively populated via single-frequency laser excitation of a 10 keV ion beam. The levels studied had term energies up to 29 600 cm–1, and decay branches with spontaneous emission in the range 250–850 nm were detected. The experimental accuracy was in the range of 10%. We used these branching ratios along with our previously determined radiative lifetimes to infer transition probabilities and oscillator strengths for 608 transitions in the wavelength range 363–771 nm, which are useful for stellar abundance determinations.PACS Nos.: 32.70.Cs, 95.30.Ky

Fast-ion-beam laser-induced-fluorescence measurements of branching fractions and oscillator strengths in Nd II

2007 ◽  
Vol 85 (12) ◽  
pp. 1343-1379 ◽  
Author(s):  
R Li ◽  
S J Rehse ◽  
T J Scholl ◽  
A Sharikova ◽  
R Chatelain ◽  
...  
Keyword(s):  
Spontaneous Emission ◽  
Transition Probabilities ◽  
Ion Beam ◽  
Branching Fractions ◽  
Oscillator Strengths ◽  
Single Frequency ◽  
Beam Laser ◽  
Fluorescence Measurements ◽  
Frequency Laser ◽  
Fast Ion

We measured the spontaneous-emission branching fractions of 46 levels in Nd II, selectively populated via single-frequency laser excitation of a 10 keV ion beam. The levels studied had term energies up to 29 955 cm–1, and decay branches with spontaneous emission in the range 372–850 nm were detected. The experimental accuracy for branching fractions over 0.1 was ~7%. We used these branching fractions along with our previously determined radiative lifetimes to infer transition probabilities and oscillator strengths for 430 transitions, which are useful for stellar abundance determinations. PACS Nos.: 32.70Cs, 95.30Ky

scholarly journals Low noise 400 W coherently combined single frequency laser beam for next generation gravitational wave detectors

2021 ◽  
Vol 29 (7) ◽  
pp. 10140
Author(s):  
Felix Wellmann ◽  
Nina Bode ◽  
Peter Wessels ◽  
Ludger Overmeyer ◽  
Jörg Neumann ◽  
...  
Keyword(s):  
Laser Beam ◽  
Gravitational Wave ◽  
Low Noise ◽  
Single Frequency ◽  
Next Generation ◽  
Gravitational Wave Detectors ◽  
Frequency Laser

scholarly journals MXene Core-Shell Nanosheets: Facile Synthesis, Optical Properties, and Versatile Photonics Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1995
Author(s):  
Yunjia Wang ◽  
Shunxiang Liu ◽  
Feng Zhu ◽  
Yiyu Gan ◽  
Qiao Wen
Keyword(s):  
Gold Nanoparticles ◽  
Research Work ◽  
Mode Locking ◽  
Single Frequency ◽  
Core Shell ◽  
Complex Structures ◽  
Facile Synthesis ◽  
Laser Applications ◽  
Saturable Absorbers ◽  
Frequency Laser

In recent years, the transition metal carbonitrides(MXenes) have been widely applied to photoelectric field, and better performance of these applications was achieved via MXene complex structures. In our work, we proposed a MXene core-shell nanosheet composed of a Ti2C (MXene) phase and gold nanoparticles, and applied it to mode-locked and single-frequency fiber laser applications. The optoelectronic results suggested that the performances of these two applications were both improved when MXene core-shell nanosheets were applied. As a result, we obtained a mode-locking operation with 670 fs pulses, and the threshold pump power reached to as low as 20 mW. Besides, a single-frequency laser with the narrowest linewidth of ~1 kHz is also demonstrated experimentally. Our research work proved that MXene core-shell nanosheets could be used as saturable absorbers (SAs) to promote versatile photonic applications.

Fiber-bulk hybrid Er:YAG laser with 1617 nm single frequency laser output

2012 ◽  
Vol 9 (9) ◽  
pp. 674-677 ◽  
Author(s):  
L N Zhu ◽  
C Q Gao ◽  
R Wang ◽  
Y Zheng ◽  
M W Gao
Keyword(s):  
Er:Yag Laser ◽  
Laser Output ◽  
Single Frequency ◽  
Frequency Laser

scholarly journals Characterization of dissimilar aluminum-copper material joining by controlled dual laser beam

2021 ◽  
Author(s):  
Joon Ho Cha ◽  
Hae Woon Choi
Keyword(s):  
Laser Beam ◽  
Power Distribution ◽  
Near Infrared ◽  
Weld Zone ◽  
Tensile Tests ◽  
Bead Width ◽  
Single Beam ◽  
The Core ◽  
Beam Laser ◽  
Dual Laser

Abstract Laser technology has many advantages in welding for the manufacture of EV battery packs. Aluminum (Al) and copper (Cu) are welded using a dual laser beam, suggesting the optimum power distribution for the core and ring beams. Due to the very high reflectance of Cu and Al exposed to near-infrared lasers, the material absorbs a very small amount of energy. Compared to single beam laser welding, dual beam welding has significantly improved surface quality by controlling surface solidification. The study focused on the quality of weld surface beads, weld properties and tensile strength by varying the output ratio of the core beam to the ring beam. Optimal conditions of Al6061 were a 700 W core beam, a 500 W ring beam and 200 mm/s of weld speed. For the C1020P, the optimum conditions were a center beam of 2500 W, a ring beam of 3000 W and a welding speed of 200 mm/s. In laser lap welding of Al-Al and Al-Cu, the bead width and the interfacial bead width of the joint increased as the output increased. The penetration depth did not change significantly, but small pores were formed at the interface of the junction. Tensile tests were performed to demonstrate the reliability of the weld zone, and computer simulations provided analysis of the heat distribution for optimal heat input conditions.

A 160 W single-frequency laser based on an active tapered double-clad fiber amplifier

2013 ◽  
Vol 10 (6) ◽  
pp. 065101 ◽  
Author(s):  
A I Trikshev ◽  
A S Kurkov ◽  
V B Tsvetkov ◽  
S A Filatova ◽  
J Kertulla ◽  
...  
Keyword(s):  
Fiber Amplifier ◽  
Single Frequency ◽  
Frequency Laser
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