A study of the K = 3n A1 - A2 centrifugal splitting in the 3ν2 and 4ν2 states of PH3 using a difference-frequency laser system

1979 ◽  
Vol 75 (2) ◽  
pp. 181-196 ◽  
Author(s):  
P. Bernard ◽  
Takeshi Oka
Keyword(s):  
Laser System ◽  
Difference Frequency ◽  
Frequency Laser

A study of the electric quadrupole fundamental band of D2 using an infrared difference frequency laser system

1978 ◽  
Vol 56 (10) ◽  
pp. 1315-1320 ◽  
Author(s):  
A. R. W. McKellar ◽  
T. Oka
Keyword(s):  
Laser System ◽  
Electric Quadrupole ◽  
Difference Frequency ◽  
Ratio Method ◽  
Molecular Constants ◽  
Frequency Tunable ◽  
Vibration Rotation ◽  
Frequency Laser ◽  
Deuterium Molecule ◽  
Rotation Spectrum

Frequency tunable infrared radiation from a difference frequency laser system has been used with a long path cell to study the electric quadrupole vibration–rotation spectrum of the deuterium molecule in the 2.8–3.9 μm region. A ratio method as well as frequency modulation were used to detect the weak absorption. Sub-Doppler linewidths due to collisional narrowing were observed with a D2 pressure of 1 atm. The wavelengths of 11 transitions were measured relative to infrared reference lines, and improved molecular constants for the ν = 0 and 1 states of D2 were determined.

Difference-frequency laser spectroscopy of the ν4 fundamental band of NH3D+

1986 ◽  
Vol 64 (10) ◽  
pp. 1356-1358 ◽  
Author(s):  
T. Nakanaga ◽  
T. Amano
Keyword(s):  
Laser System ◽  
Rotational Constant ◽  
Rotational Transition ◽  
Difference Frequency ◽  
High Resolution Spectrum ◽  
Interstellar Space ◽  
Molecular Constants ◽  
Fundamental Band ◽  
Least Squares Fit ◽  
Frequency Laser

The high-resolution spectrum of the ν4 fundamental band of NH3D+ has been observed in absorption in a hollow-cathode discharge with a difference-frequency laser system. The molecular constants have been determined through a least squares fit of the observed transition wave numbers to an effective Hamiltonian. The equilibrium rotational constant is estimated to be 4.438 ± 0.027 cm−1, from which the equilibrium N—H bond length is calculated to be 1.021 ± 0.003 Å. Some low-lying rotational transition frequencies in the ground state are calculated to assist in the search for pure rotational transitions in the laboratory and in interstellar space.

ChemInform Abstract: DIFFERENCE FREQUENCY LASER SPECTROSCOPY OF THE ν3 BAND OF THE METHYL RADICAL

1983 ◽  
Vol 14 (8) ◽  
Author(s):  
T. AMANO ◽  
P. F. BERNATH ◽  
C. YAMADA ◽  
Y. ENDO ◽  
E. HIROTA
Keyword(s):  
Laser Spectroscopy ◽  
Difference Frequency ◽  
Methyl Radical ◽  
Frequency Laser

Intensités des raies d'absorption dans la bande chaude ν8 + ν11 − ν11 de l'aliène 12C3H4

1986 ◽  
Vol 64 (3) ◽  
pp. 289-296 ◽  
Author(s):  
M. Dang-Nhu ◽  
A. S. Pine
Keyword(s):  
High Resolution ◽  
Difference Frequency ◽  
Laser Spectrometer ◽  
Intensity Parameters ◽  
Hot Band ◽  
Frequency Laser ◽  
Group D

Strengths of individual lines of the hot band ν8 + ν11 − ν11 of 12C3H4 at 3 μm have been measured with a high-resolution difference-frequency laser spectrometer. Finally, two intensity parameters have been determined using a general formulation written for hot bands E′ × E ← E of group D2d.

scholarly journals Mid-infrared optical frequency comb in the 2.7–4.0 μm range via difference frequency generation from a compact laser system

2020 ◽  
Vol 8 ◽  
Author(s):  
Lian Zhou ◽  
Yang Liu ◽  
Gehui Xie ◽  
Chenglin Gu ◽  
Zejiang Deng ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Near Infrared ◽  
Quantum Noise ◽  
Frequency Comb ◽  
Laser System ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Average Output ◽  
Mid Infrared ◽  
Frequency Generation

Abstract We report on the generation of a mid-infrared (mid-IR) frequency comb with a maximum average output power of 250 mW and tunability in the 2.7–4.0 μm region. The approach is based on a single-stage difference frequency generation (DFG) starting from a compact Yb-doped fiber laser system. The repetition rate of the near-infrared (NIR) comb is locked at 75 MHz. The phase noise of the repetition rate in the offset-free mid-IR comb system is measured and analyzed. Except for the intrinsic of NIR comb, environmental noise at low frequency and quantum noise at high frequency from the amplifier chain and nonlinear spectral broadening are the main noise sources of broadening the linewidth of comb teeth, which limits the precision of mid-IR dual-comb spectroscopy.

Fine structure of the H2 5g–4f inter-Rydberg transition revealed by difference frequency laser spectroscopy

2000 ◽  
Vol 113 (22) ◽  
pp. 10143-10153 ◽  
Author(s):  
D. Uy ◽  
C. M. Gabrys ◽  
T. Oka ◽  
B. J. Cotterell ◽  
R. J. Stickland ◽  
...  
Keyword(s):  
Fine Structure ◽  
Laser Spectroscopy ◽  
Difference Frequency ◽  
Rydberg Transition ◽  
Frequency Laser
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