Breaking through the limits of a single fiber laser amplifier - Coherent Beam Combination
2024-01-23
(Press-News.org)
High-power, high-energy ultrafast fiber lasers are indispensable tools in various fields, from basic and applied science research to industrial processing. However, due to thermal effects, nonlinear effects, there is always a limit to the power/energy expansion of a single fiber laser amplifier. Coherent Beam Combination (CBC) technology is an effective strategy to break through the limits of a single fiber laser amplifier and further achieve power/energy scaling. Under the conditions of mutual coherence and stable phase relationship, multiple laser beams can be superimposed and mutually interfere with each other. This approach allows for an improvement in average power and pulse energy by a factor almost equal to the total number of combined channels. However, with the increase of beam combining channels, the complexity of CBC systems also increases, bringing negative impacts such as decreased beam combining efficiency, degraded beam quality, and increased operational difficulty to the system.
Researchers from Huazhong University of Science and Technology reported the use of filled aperture coherent beam combining technology to achieve an ultrafast fiber laser system with an average power output of 403 W, 0.5 mJ pulse energy, and 260 fs. Excellent beam quality (M2<1.2) was achieved while ensuring good power stability (RMS<0.5%). By utilizing integrated electronic dispersion hardware, effective compensation has been achieved for the incomplete compensation of high-order dispersion after grating compression, optimizing pulse width while also achieving superior improvement in pulse quality. In addition, CBC operates at an average power of over 230 W per channel, simplifying system complexity and operational difficulty. In the future, it is expected that using only four channel coherent synthesis can increase power to the kw level and pulse energy to the mJ level. The work entitled “260 fs, 403 W coherently combined fiber laser with precise high-order dispersion management” was published on Frontiers of Optoelectronics (published on Jan. 22, 2024).
END
[Attachments] See images for this press release:
ELSE PRESS RELEASES FROM THIS DATE:
2024-01-23
In standard cosmological models, the formation of cosmological structures begins with the emergence of small structures, which subsequently undergo hierarchical merging, leading to the formation of larger systems. As the Universe ages, massive galaxy groups and clusters, being the largest systems, tend to increase in mass and reach a more dynamically relaxed state.
The motions of satellite galaxies around these groups and clusters provide valuable insights into their assembly status. The observations of such motion offer crucial clues about the age of the Universe.
By using public data from the Sloan Digital Sky Survey (SDSS), a research team led by Prof. GUO ...
2024-01-23
Super-resolution (SR) fluorescence microscopy, through the use of fluorescent probes and specific excitation and emission procedures, surpasses the diffraction limit of resolution (200~300 nm) that was once a barrier. Most SR techniques are heavily reliant on image calculations and processing to retrieve SR information. However, factors such as fluorophores photophysics, sample's chemical environment, and optical setup situations can cause noise and distortions in raw images, potentially impacting the final ...
2024-01-23
Integral imaging (II) display is one of the most promising near-eye displays (NEDs) due to its compact volume, full parallax, convenient full-color display, and, more importantly, true-3D and more realistic depth perception from eliminating the vergence-accommodation conflict (VAC). However, II displays based on the conventional optical architecture, such as microlens arrays, are limited in resolution, field of view, depth of field, etc. As micro-displays have increasingly higher pixel densities, conventional optical architecture is inadequate in ...
2024-01-23
A UC San Francisco-led study has for the first time identified genetic variants that predict whether patients will respond to treatment for preterm birth, a condition that affects one in 10 infants born in the United States.
The findings are critical because no medication is available in the U.S. to treat preterm birth. Last year, the Food and Drug Administration (FDA) pulled the only approved therapy to help prevent this condition, a synthetic form of progesterone sold under the brand name Makena, from the market, citing ineffectiveness.
The new research found that pregnant individuals with high levels of mutations in certain genes ...
2024-01-23
People suffering from Long COVID or Myalgic Encephalomyelitis /Chronic Fatigue Syndrome (ME/CFS) could benefit from a coordinated treatment strategy, a new University of Otago study has found.
The pilot study, published in Scientific Reports, a Nature journal, has confirmed what researchers have suspected for some time: the two conditions are closely related.
Lead author Emeritus Professor Warren Tate says the research - the first comparative molecular study of the immune cell proteins of both conditions - “strongly affirms” the link between the two.
“This means information from study of the pathophysiology ...
2024-01-23
Now in its third year of operation, Direct to Open (D2O) is proud to announce that it has reached its full funding goal in 2024 and will open access to 79 new monographs and edited book collections this year. What makes this year noteworthy is that this is the first year in which D2O has been fully funded by its November 30 deadline and will not require an extension through the end of the fiscal year.
“Reaching our overall funding goal – in full and on time – is a major milestone in developing a sustainable open ...
2024-01-23
Attending an NHS Health Check appointment — a preventative screening programme offered for free in the UK — is associated with both a decreased risk of dying and a decreased risk of several diseases, including dementia and liver cirrhosis. The results, published in BMC Medicine, suggest that the NHS Health Check and other similar preventative programmes can be effective at reducing a population’s overall risk of long-term disease.
The NHS Health Check is a preventative screening programme designed to identify individuals at risk for heart disease, stroke, diabetes, and kidney disease. Healthy ...
2024-01-23
Knocking back energy drinks is linked to poor quality sleep and insomnia among college students, finds a large Norwegian study published in the open access journal BMJ Open.
And the higher the frequency of consumption, the fewer hours of nightly shut eye the students clocked up. But even just the occasional can—1-3 times a month—is linked to a heightened risk of disturbed sleep, the findings indicate.
Energy drinks contain an average caffeine content of 150 mg per litre as well as sugar, vitamins, minerals and amino acids in varying quantities, note the researchers. Marketed as mental and physical pick-me-ups, ...
2024-01-23
Men with inflammatory joint disease, such as rheumatoid arthritis, are less likely to be childless and have more children than their healthy peers, suggests research published online in the Annals of the Rheumatic Diseases.
As yet unknown factors associated with developing the disease and/or its treatment might influence fertility, suggest the researchers.
Autoimmune diseases are on the rise in the West, and impaired fertility has been reported in Norwegian women with inflammatory joint diseases. But only a few studies looking at the potential impact on men’s fertility have ...
2024-01-23
The fastest and highest growth in the prevalence of childhood obesity in England has been among 11-15 year olds, rising from 30% in 1995 to 38% in 2019, finds a detailed analysis of national data, published online in the Archives of Disease in Childhood.
But the inequality gap in rates has deepened, driven primarily by differences in deprivation, gender, family structure, ethnicity and parental education, the analysis reveals.
And the current cost of living crisis is set to aggravate these disparities, putting even more disadvantaged children at risk, warn the study authors.
England is projected to have the highest prevalence of obesity in ...
LAST 30 PRESS RELEASES:
[Press-News.org] Breaking through the limits of a single fiber laser amplifier - Coherent Beam Combination
