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[IEEE 2019 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech) - St. Petersburg, Russia (2019.10.17-2019.10.18)] 2019 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech) - Laser Frequency Noise Measurement by Forming an Interference Signal with Subcarrier Frequency
摘要： The paper presents a method for measuring laser frequency noise spectrum with the use of unbalanced fiber-optic interferometer and auxiliary phase modulation, forming a subcarrier signal at the interferometer output. The main features of the proposed method are analyzed. The paper also presents the results of experimental validation of the proposed method by measuring laser frequency noise of a high-coherent optical fiber laser.
关键词： laser frequency noise spectrum,laser frequency noise,coherent laser,fiber-optic interferometer
更新于2025-09-16 10:30:52
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Method for Measuring Laser Frequency Noise
摘要： We have analyzed the characteristic features and problems in the major approaches to measurement of laser frequency noise. We propose a method in which we use an unbalanced fiber-optic interferometer, generation at the optical system output of a signal for a subcarrier of the frequency, phase-modulated by fluctuations in the laser frequency, and measurement of the spectrum for this signal. The proposed approach is distinguished by relative simplicity and accessibility, and does not require using uncommon specialized instruments and complicated specific procedures.
关键词： laser noise spectrum,laser frequency noise,coherent laser source,fiber-optic interferometer
更新于2025-09-16 10:30:52
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Signature of plasmonic nanoparticles in multi-wavelength low power random lasing
摘要： A multi-wavelength plasmonic random lasing is attained by core-shell nanoparticles and the mixture of metallic nanoparticles in the host dye medium. The plasmonic nanoparticles, fabricated using laser ablation in liquid, were mixed in the corresponding dye medium and pumped with green nano-second pulsed laser. Due to this optical pumping process of plasmonic nanoparticles, amplification of the fluorescence and the lasing activity took place due to the localized surface plasmon resonance and scattering of each nanoparticle, core-shell and mixture nanoparticles. Our results show efficient coherent random lasing due to the interface between two different metallic nanoparticles in the middle part of the visible spectral region considering its applicability in the design and fabrication of compact and miniaturized random laser sources.
关键词： Plasmonic nanoparticles,Dye,Random laser,Core shell,Coherent laser
更新于2025-09-12 10:27:22
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Fast electro-optic switching for coherent laser ranging and velocimetry
摘要： The growth of 3D imaging across a range of sectors has driven a demand for beam steering technology. Fields as diverse as autonomous vehicles and medical imaging can benefit from a high speed, adaptable method of beam steering. We present a monolithic, submicrosecond electro-optic switch as a solution toward the need for reliability, speed, dynamic addressability, and compactness. Here, we demonstrate a laboratory-scale, solid-state light detection and ranging system, using the electro-optic switch to launch modulated coherent light into free space and then to collect the reflected signal. We use coherent detection of the reflected light to simultaneously extract the range and axial velocity of targets at each of the several electronically addressable output ports.
关键词： electro-optic switching,beam steering,coherent laser ranging,velocimetry,LIDAR
更新于2025-09-12 10:27:22
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Physics, Pharmacology and Physiology for Anaesthetists (Key Concepts for the FRCA) || Laser principles
摘要： Lasers are used in many types of surgery and the examinations will test both your understanding of their underlying principles and aspects related to laser safety. LASER is an acronym that stands for Light Amplification by Stimulated Emission of Radiation. The definition of the word laser also gives a very succinct description of its mode of action. A lasing medium describes the type of laser, for example a ‘CO2’ laser contains CO2 as the lasing medium. The medium is pulsed with energy from an external source, typically an intense light or electrical discharge. The application of external energy raises the electrons in the lasing medium to a higher orbit or energy state around their host atom. When the pulsed external energy is off, the excited electrons return to a lower energy orbit and, in doing so, release photons (light). The wavelength of this light is dependent upon the nature of the lasing medium and the energy difference between the high energy and low energy orbits. Photons travel in random directions although some will travel parallel to the walls of the container that holds the lasing medium. This container has mirrors at both ends that reflect the photons back and forth through the medium. As each photon hits an electron in the excited state it stimulates it to release its own photon and, in doing so, to return to a lower energy orbit. The phenomenon of this stimulated release of photons is that they share the same wavelength and phase as the photon causing the release. The mirror at one end of the container is partially mirrored in that it reflects a proportion of the photons that hit it but also allows a proportion of them out of the container as laser light. Three important properties of laser light produced by this process are that it is monochromatic, collimated and coherent.
关键词： coherent,Laser,monochromatic,Light Amplification by Stimulated Emission of Radiation,collimated
更新于2025-09-12 10:27:22