Results 251 to 260 of about 6,304,985 (297)
Some of the next articles are maybe not open access.
Reducing the phase noise in diode lasers
Optics Letters, 2019Diode lasers are widely used in atomic physics given their narrow linewidth and wavelength tunability. Nevertheless, although they present low noise for their intensity, excessive noise in the phase limits their application in quantum optics. Looking for reduction of this phase noise, we built and characterized a ring laser, using a semiconductor ...
R. L. Rincon Celis, M. Martinelli
openaire +2 more sources
Comparison of laser phase and suppression of noise
AIP Conference Proceedings, 1986The sensitivity and accuracy of the usual methods for comparing the phases of two beams of light are affected by the intensity noise of environment and light source, although they can be improved by a lock-in circuit only for a periodic signal.
Xuan-Min Yang, Ming Yi, Zong-Hua Huan
openaire +1 more source
Characterization of phase noise in semiconductor lasers
Applied Physics Letters, 1982Phase noise in semiconductor lasers has been investigated by many authors in the range of low frequencies (<1 MHz). In this letter we present for the first time phase noise measurements extended up to frequencies greater than 1 GHz. Experimental results showing the power spectral density Sφ̇(ω) of the instantaneous frequency φ̇(t) and the ...
S. Piazzolla, P. Spano, M. Tamburrini
openaire +1 more source
Laser phase noise reduction for industrial interferometric applications
Applied Optics, 2004Laser ultrasound is a technique used for the ultrasonic inspection of composites during manufacturing of advanced jet fighters. With this technique laser interferometry is used to detect ultrasonic displacements generated by a laser. In theory, the signal-to-noise ratio is proportional to the square root of the collected detection light.
Marc, Dubois +2 more
openaire +2 more sources
Effects of colored noise on the intensity and phase in a laser system
Physics Letters A, 2001zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Luo, Xiaoqin, Zhu, S., Chen, Xianfeng
openaire +1 more source
Laser Phase Noise Tolerance of Probabilistically-Shaped Constellations
Optical Fiber Communication Conference, 2018We numerically confirmed that required-OSNR gain was obtained by probabilistically-shaped 64/256 QAM compared with uniformly-shaped 16/64 QAM in not only arbitrary white Gaussian noise condition but also in phase noise condition.
Seiji Okamoto +3 more
openaire +2 more sources
Noise in strong laser-atom interactions: Phase telegraph noise
Physical Review A, 1984We discuss strong laser-atom interactions that are subjected to jump-type (random telegraph) random-phase noise. Physically, the jumps may arise from laser fluctuations, from collisions of various kinds, or from other external forces. Our discussion is carried out in two stages.
J. H. Eberly +2 more
openaire +1 more source
Phase noise issues in femtosecond lasers
SPIE Proceedings, 2001This paper explores the affect of phase modulation (PM), amplitude modulation (AM), and thermal noise on the rf spectrum, phase jitter, timing jitter, and frequency stability of femtosecond lasers and other precision sources. Using these concepts we can suggest how some noise aspects of femtosecond pulsed lasers should scale.
openaire +1 more source
The Effects of Laser Phase Noise on Laser Radar Performance
1992Abstract : Laser phase noise is shown to degrade the sensitivity in target vibration measurements using a CW laser with an FM discriminator.
A. L. Kachelmyer +4 more
openaire +1 more source
Phase Noise Reduction of a Laser Source by External Phase Compensation
2019 IEEE Research and Applications of Photonics in Defense Conference (RAPID), 2019Based on direct phase noise compensation utilizing an external phase modulator, we reduce the laser spectral width from 450 kHz to 60 kHz and detect directly 5 G-symbol/s binary and quaternary phase shift keying signals without digital signal processing electronics.
Ha Trong Thuy, Yong-Yuk Won, Dongsun Seo
openaire +1 more source