Experimental Module Of The 10.6 µm Laser Rangefinder With The Heterodyne Detection And Pulse Compression

1987 ◽  
Author(s):  
M. Kopica ◽  
M. Strzelec ◽  
Z. Trzesowski
Keyword(s):  
Pulse Compression ◽  
Heterodyne Detection ◽  
Laser Rangefinder

A CO2 laser rangefinder using heterodyne detection and chirp pulse compression

1981 ◽  
Vol 13 (1) ◽  
pp. 35-45 ◽  
Author(s):  
K. F. Hulme ◽  
B. S. Collins ◽  
G. D. Constant ◽  
J. T. Pinson
Keyword(s):  
Co2 Laser ◽  
Pulse Compression ◽  
Heterodyne Detection ◽  
Chirp Pulse ◽  
Laser Rangefinder

Heterodyne CO2 laser rangefinder using pulse compression

1981 ◽  
Author(s):  
G. Courrier ◽  
J. L. Duvent ◽  
G. Ringehbagh ◽  
J. J. Bernard ◽  
G. De Gorueu ◽  
...  
Keyword(s):  
Co2 Laser ◽  
Pulse Compression ◽  
Laser Rangefinder

CO2 Laser Doppler Rangefinding With Heterodyne Detection And Chirp Pulse Compression

1986 ◽  
Author(s):  
Jean Dansac ◽  
Jean L. Meyzonnette ◽  
Patrick Plainchamp ◽  
Lionel R. Baker ◽  
Andre Masson
Keyword(s):  
Pulse Compression ◽  
Laser Doppler ◽  
Heterodyne Detection ◽  
Chirp Pulse

High-intensity pulse compression with plasma nonlinearity

2001 ◽  
Vol 11 (PR2) ◽  
pp. Pr2-617-Pr2-620
Author(s):  
Z. Zeng ◽  
R. Li ◽  
Z. Z. Xu
Keyword(s):  
High Intensity ◽  
Pulse Compression

USE OF A CO2LASER AS A LOCAL OSCILLATOR FOR A 10 MICRON HETERODYNE DETECTION

1987 ◽  
Vol 48 (C7) ◽  
pp. C7-569-C7-571
Author(s):  
A. DELAHAIGUE ◽  
D. COURTOIS ◽  
C. THIEBEAUX ◽  
H. LE CORRE
Keyword(s):  
Local Oscillator ◽  
Heterodyne Detection

Generalized Heterodyne Configurations for Photo-induced Force Microscopy

2019 ◽  
Author(s):  
Le Wang ◽  
Devon Jakob ◽  
Haomin Wang ◽  
Alexis Apostolos ◽  
Marcos M. Pires ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Repetition Rate ◽  
Modulation Frequency ◽  
High Harmonic ◽  
Chemical Imaging ◽  
Heterodyne Detection ◽  
Force Microscopy ◽  
Wide Range ◽  
The Difference ◽  
Afm Cantilever

<div>Infrared chemical microscopy through mechanical probing of light-matter interactions by atomic force microscopy (AFM) bypasses the diffraction limit. One increasingly popular technique is photo-induced force microscopy (PiFM), which utilizes the mechanical heterodyne signal detection between cantilever mechanical resonant oscillations and the photo induced force from light-matter interaction. So far, photo induced force microscopy has been operated in only one heterodyne configuration. In this article, we generalize heterodyne configurations of photoinduced force microscopy by introducing two new schemes: harmonic heterodyne detection and sequential heterodyne detection. In harmonic heterodyne detection, the laser repetition rate matches integer fractions of the difference between the two mechanical resonant modes of the AFM cantilever. The high harmonic of the beating from the photothermal expansion mixes with the AFM cantilever oscillation to provide PiFM signal. In sequential heterodyne detection, the combination of the repetition rate of laser pulses and polarization modulation frequency matches the difference between two AFM mechanical modes, leading to detectable PiFM signals. These two generalized heterodyne configurations for photo induced force microscopy deliver new avenues for chemical imaging and broadband spectroscopy at ~10 nm spatial resolution. They are suitable for a wide range of heterogeneous materials across various disciplines: from structured polymer film, polaritonic boron nitride materials, to isolated bacterial peptidoglycan cell walls. The generalized heterodyne configurations introduce flexibility for the implementation of PiFM and related tapping mode AFM-IR, and provide possibilities for additional modulation channel in PiFM for targeted signal extraction with nanoscale spatial resolution.</div>

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