scholarly journals Fourier Transform Optical Frequency Comb Spectroscopy with Resolution Beyond the Optical-path-difference Limit

2016 ◽  
Author(s):  
Piotr Masłowski
Keyword(s):  
Fourier Transform ◽  
Frequency Comb ◽  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
Optical Frequency Comb ◽  
Optical Frequency

Optical Frequency Comb Fourier Transform Spectroscopy with Resolution beyond the Path Difference Limit

2016 ◽  
Author(s):  
Lucile Rutkowski ◽  
Alexandra C. Johansson ◽  
Amir Khodabakhsh ◽  
Piotr Maslowski ◽  
Grzegorz Kowzan ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Frequency Comb ◽  
Path Difference ◽  
Fourier Transform Spectroscopy ◽  
Optical Frequency Comb ◽  
Optical Frequency

scholarly journals THz Signal Generator Using a Single DFB Laser Diode and the Unbalanced Optical Fiber Interferometer

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4862
Author(s):  
Blaž Pongrac ◽  
Denis Đonlagic ◽  
Matej Njegovec ◽  
Dušan Gleich
Keyword(s):  
Optical Fiber ◽  
Laser Diode ◽  
Optical Signal ◽  
Optical Path Difference ◽  
Sweep Rate ◽  
Path Difference ◽  
Optical Path ◽  
Signal Generator ◽  
Optical Frequency ◽  
Frequency Sweep

This paper presents a frequency-modulated optical signal generator in the THz band. The proposed method is based on a fast optical frequency sweep of a single narrowband laser diode used together with an optical fiber interferometer. The optical frequency sweep using a single laser diode is achieved by generating short current pulses with a high amplitude, which are driving the laser diode. Theoretical analysis showed that the modulation frequency could be changed by the optical path difference of the interferometer or optical frequency sweep rate of a laser diode. The efficiency of the optical signal generator with Michelson and Fabry–Perot interferometers is theoretically analyzed and experimentally evaluated for three different scenarios. Interferometers with different optical path differences and a fixed optical frequency sweep rate were used in the first scenario. Different optical frequency sweep rates and fixed optical path differences of the interferometers were used in the second scenario. This paper presents a method for optical chirp generation using a programmable current pulse waveform, which drives a laser diode to achieve nonlinear optical sweep with a fixed optical path difference of the interferometer. The experimental results showed that the proposed signals could be generated within a microwave (1–30 GHz) and THz band (0.1–0.3 THz).

Design and Characterization of a Fourier Transform Micro-Spectrometer

2009 ◽  
Vol 74 ◽  
pp. 211-214 ◽  
Author(s):  
Shou Hua Wang ◽  
Hong Bin Yu ◽  
Fook Siong Chau ◽  
X.S. Tang
Keyword(s):  
Fourier Transform ◽  
Optical Resolution ◽  
Input Voltage ◽  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
Spectral Peaks ◽  
Grating Interferometer ◽  
Diode Pumped

In this paper, we present a Fourier Transform micro-spectrometer which works based on a lamellar grating interferometer. The spectrometer model is electrostatically driven by parallel plate actuators which change the optical path difference (OPD) between movable grating facets and fixed ones. With a 200V input voltage, a maximum OPD of 48.7μm is achieved. The spectrum of a combined light source of a diode-pumped solid-state (DPSS) laser (λ=532.0nm) and a laser diode (λ=637.2nm) is experimentally acquired to demonstrate the performance of the model. The reconstructed spectrum displays two separate spectral peaks at 530.5nm and 635.2nm and the corresponding full-width at half-maximum (FWHM) resolutions are 9.8nm and 12.8nm respectively, indicating good wavelength accuracy and optical resolution.

scholarly journals Fourier transform and Vernier spectroscopy using an optical frequency comb at 3–54  μm

2016 ◽  
Vol 41 (11) ◽  
pp. 2541 ◽  
Author(s):  
Amir Khodabakhsh ◽  
Venkata Ramaiah-Badarla ◽  
Lucile Rutkowski ◽  
Alexandra C. Johansson ◽  
Kevin F. Lee ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Frequency Comb ◽  
Optical Frequency Comb ◽  
Optical Frequency

Fourier-Transform-Based Noise-Immune Cavity-Enhanced Optical Frequency Comb Spectroscopy

2016 ◽  
Author(s):  
Alexandra C. Johansson ◽  
Amir Khodabakhsh ◽  
Lucile Rutkowski ◽  
Aleksandra Foltynowicz
Keyword(s):  
Fourier Transform ◽  
Frequency Comb ◽  
Optical Frequency Comb ◽  
Optical Frequency

Fourier-Transform-Based Noise-Immune Cavity-Enhanced Optical Frequency Comb Spectroscopy

CLEO: 2015 ◽  
2015 ◽  
Author(s):  
Amir Khodabakhsh ◽  
Alexandra C. Johansson ◽  
Lucile Rutkowski ◽  
Aleksandra Foltynowicz
Keyword(s):  
Fourier Transform ◽  
Frequency Comb ◽  
Optical Frequency Comb ◽  
Optical Frequency

scholarly journals Simultaneous ground-based observations of O<sub>3</sub>, HCl, N<sub>2</sub>O, and CH<sub>4</sub> over Toronto, Canada by three Fourier transform spectrometers with different resolutions

2007 ◽  
Vol 7 (5) ◽  
pp. 1275-1292 ◽  
Author(s):  
D. Wunch ◽  
J. R. Taylor ◽  
D. Fu ◽  
P. Bernath ◽  
J. R. Drummond ◽  
...  
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
Lower Sensitivity ◽  
Critical Importance ◽  
The Difference ◽  
Total Column ◽  
Better Than

Abstract. An intercomparison of three Fourier transform spectrometers (FTSs) with significantly different resolutions is presented. The highest-resolution instrument has a maximum optical path difference of 250 cm, and the two lower-resolution instruments have maximum optical path differences of 50 cm and 25 cm. The results indicate that the two lower-resolution instruments can retrieve total column amounts of O3, HCl, N2O and CH4 using the SFIT2 retrieval code with percent differences from the high-resolution instrument generally better than 4%. Total column amounts of the stratospheric species (O3 and HCl) have larger differences than those of the tropospheric species (N2O and CH4). Instrument line shape (ILS) information is found to be of critical importance when retrieving total columns of stratospheric gases from the lower-resolution instruments. Including the ILS information in the retrievals significantly reduces the difference in total column amounts between the three instruments. The remaining errors for stratospheric species total column amounts can be attributed to the lower sensitivity of the lower-resolution FTSs to the stratosphere.

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