An analysis of the second order spatial coherence of stationary laser oscillators with a Fabry-Perot resonator

1977 ◽  
Vol 9 (5) ◽  
pp. 419-425 ◽  
Author(s):  
F. Bodem
Keyword(s):  
Spatial Coherence ◽  
Second Order ◽  
Fabry Perot ◽  
Laser Oscillators

scholarly journals Optical coherence encryption with structured random light

PhotoniX ◽  
2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Deming Peng ◽  
Zhaofeng Huang ◽  
Yonglei Liu ◽  
Yahong Chen ◽  
Fei Wang ◽  
...  
Keyword(s):  
Fractional Fourier Transform ◽  
Spatial Coherence ◽  
Second Order ◽  
Statistical Characteristics ◽  
Interference Effects ◽  
Complex Environments ◽  
Optical Encryption ◽  
Light Matter Interaction ◽  
Encryption Method ◽  
Promising Avenue

AbstractInformation encryption with optical technologies has become increasingly important due to remarkable multidimensional capabilities of light fields. However, the optical encryption protocols proposed to date have been primarily based on the first-order field characteristics, which are strongly affected by interference effects and make the systems become quite unstable during light–matter interaction. Here, we introduce an alternative optical encryption protocol whereby the information is encoded into the second-order spatial coherence distribution of a structured random light beam via a generalized van Cittert–Zernike theorem. We show that the proposed approach has two key advantages over its conventional counterparts. First, the complexity of measuring the spatial coherence distribution of light enhances the encryption protocol security. Second, the relative insensitivity of the second-order statistical characteristics of light to environmental noise makes the protocol robust against the environmental fluctuations, e.g, the atmospheric turbulence. We carry out experiments to demonstrate the feasibility of the coherence-based encryption method with the aid of a fractional Fourier transform. Our results open up a promising avenue for further research into optical encryption in complex environments.

Spectral-narrowing techniques for excimer laser oscillators

1985 ◽  
Vol 63 (2) ◽  
pp. 214-219 ◽  
Author(s):  
Terrence J. McKee
Keyword(s):  
Excimer Laser ◽  
Grazing Incidence ◽  
Broadband Noise ◽  
Spectral Narrowing ◽  
Fabry Perot ◽  
Laser Oscillators ◽  
Recent Developments ◽  
Overall Efficiency

Various techniques for use in spectral narrowing and tuning of excimer laser oscillators are described. Intracavity dispersive elements include Littrow grating, grazing-incidence grating, prisms, and Fabry–Perot etalons. Recent developments to improve overall efficiency and reduce broadband noise are outlined.

Passive synchronization of two independent laser oscillators with a Fabry–Perot modulator

2002 ◽  
Vol 27 (6) ◽  
pp. 454 ◽  
Author(s):  
W. Seitz ◽  
T. R. Schibli ◽  
U. Morgner ◽  
F. X. Kärtner ◽  
C. H. Lange ◽  
...  
Keyword(s):  
Fabry Perot ◽  
Laser Oscillators

Mid-Infrared Standoff Spectroscopy Using a Supercontinuum Laser with Compact Fabry–Pérot Filter Spectrometers

2018 ◽  
Vol 72 (4) ◽  
pp. 634-642 ◽  
Author(s):  
Jakob Kilgus ◽  
Kristina Duswald ◽  
Gregor Langer ◽  
Markus Brandstetter
Keyword(s):  
Real Time ◽  
Quantum Cascade Lasers ◽  
Spatial Coherence ◽  
Mid Infrared ◽  
High Brightness ◽  
Quantum Cascade ◽  
Ir Sources ◽  
Standoff Detection ◽  
Fabry Perot ◽  
Cascade Lasers

Mid-infrared (MIR) supercontinuum (SC) lasers are an attractive new option in the field of IR spectroscopy, especially for standoff detection. Supercontinuum radiation unites high brightness, high spatial coherence, and broadband spectral coverage, thereby surpassing thermal IR sources and challenging quantum cascade lasers. The employed SC source operates in the spectral region of 1.2–4.6 µm, filling the spectral gap where quantum cascade lasers lack broader availability. In this work, the SC radiation was recorded by compact Fabry–Pérot filter spectrometers ideally suited for sensitive standoff detection with real-time capability. The noise performance of the setup and measurements of different substances at standoff distances are presented, e.g., of different paints on a metal surface and an explosive precursor. Furthermore, the real-time capability of the setup is demonstrated by monitoring the evaporation of liquid 2-propanol.

scholarly journals The spatial coherence wavelets and second-order correlation

2015 ◽  
Vol 9 (1) ◽  
pp. 1-6
Author(s):  
Juan González ◽  
Román Castañeda
Keyword(s):  
Spatial Coherence ◽  
Second Order

Passive synchronization of two independent laser oscillators with a Fabry-Perot modulator

2002 ◽  
Author(s):  
Wolfgang Seitz ◽  
T.R. Schibli ◽  
U. Morgner ◽  
F.X. Kärtner ◽  
C.H. Lange ◽  
...  
Keyword(s):  
Fabry Perot ◽  
Laser Oscillators

Second-order temporal and spatial coherence of thermal electrons

1987 ◽  
Vol 99 (2) ◽  
pp. 227-245 ◽  
Author(s):  
M. P. Silverman
Keyword(s):  
Spatial Coherence ◽  
Second Order ◽  
Temporal And Spatial
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