FROM A TRANSPORTABLE I2-STABILIZED ND: YAG LASER TO HYPERFINE CONSTANTS OF I2 AND LASER FREQUENCY MEASUREMENT

2006 ◽  
Author(s):  
FENG-LEI HONG
Keyword(s):  
Frequency Measurement ◽  
Laser Frequency ◽  
Yag Laser ◽  
Laser Frequency Measurement ◽  
Hyperfine Constants

Laser Frequency Measurement at NPL

1989 ◽  
pp. 459-460
Author(s):  
D. J. E. Knight ◽  
K. I. Pharaoh ◽  
M. J. Padgett
Keyword(s):  
Frequency Measurement ◽  
Laser Frequency ◽  
Laser Frequency Measurement

Influence of YAG Laser Frequency on a∶H-Si Thin Films Micro-Crystallization

2013 ◽  
Vol 50 (2) ◽  
pp. 021406
Author(s):  
张竹青 Zhang Zhuqing ◽  
王强 Wang Qiang ◽  
花国然 Hua Guoran ◽  
周雨薇 Zhou Yuwei
Keyword(s):  
Thin Films ◽  
Laser Frequency ◽  
Yag Laser

Measurement of the speed of light I. Introduction and frequency measurement of a carbon dioxide laser

1977 ◽  
Vol 355 (1680) ◽  
pp. 61-88 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Laser ◽  
Frequency Measurement ◽  
Laser Frequency ◽  
Absorption Cell ◽  
Speed Of Light ◽  
Centre Frequency ◽  
Harmonic Mixing

This, and part II following, describe a determination of the speed of light made by measuring the frequency and wavelength of radiation from a CO 2 laser. This laser was operated on the 9.3 μm R(12) transition, and stabilized by reference to fluorescence in an external CO 2 absorption cell. The laser frequency was measured via a sequence of harmonic-mixing stages involving the HCN and H 2 O lasers as transfer oscillators, and was found to be 32 176 079 482 ± 14 kHz ( ± 4.2 parts in 10 10 ). A correction to this value of — 10 kHz is necessary to obtain the centre frequency of the CO 2 reference transition. The wavelength measurements and value of c are described in part II.

scholarly journals Laser frequency counting and frequency modulation width measurement from a fft signal

2012 ◽  
Vol 19 (3) ◽  
pp. 565-572
Author(s):  
Petr Křen
Keyword(s):  
Frequency Modulation ◽  
High Frequency ◽  
Frequency Synthesizer ◽  
Signal To Noise Ratio ◽  
Frequency Measurement ◽  
Laser Frequency ◽  
Optical Frequency ◽  
Frequency Stabilized Laser ◽  
Frequency Counting ◽  
Fft Analysis

Abstract A new method of optical frequency beat counting based on fast Fourier transform (FFT) analysis is described. Signals with a worse signal-to-noise ratio can be counted correctly comparing to the conventional counting method of detecting each period separately. The systematic error of FFT counting below 10 Hz is demonstrated and can be decreased. Additionally the modulation width of a frequency-stabilized laser with high frequency modulation index can be simultaneously measured during a carrier frequency measurement against an optical frequency synthesizer or other laser.

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