Mildred Dresselhaus and Magneto-Optics

Mildred Dresselhaus has proved herself to be a triple-threat since her entrance into the world of science. While being a physicist who has studied within the fields of material science and electrical engineering, she is most popular for her dedicated promotions for women within all science and engineering fields as well as for her own studies within the field of magneto-optics. These studies have since led the professional world into dubbing her as “the queen of carbon” science. Dr. Dresselhaus is currently an Institute Professor of Electrical Engineering and Physics at MIT.

Growing up during the Great Depression in the Bronx, NY, Dr. Dresselhaus found the niche of her early years in music. She used music as an outlet to express her innate creative abilities and her love for sound eventually led her to enroll in the Hunter College High School (HCHS) for girls at age 13 where she was able to stray from the echelon of middle class America while in search of a more desired education. After graduating from HCHS she attended Hunter College where she became the recipient of a Fulbright Fellowship to the Cavendish Laboratory of Cambridge University for one year, from 1951-1952. In 1953, Dr. Dresselhaus received her master’s degree from Radcliffe College and then her PhD from the University of Chicago five years later.

Her MIT career began at the Lincoln Laboratory where she became a present staff member and it was during this team when she switched her research focus from superconductivity to magneto-optics. Studies within magneto-optics led Dr. Dresselhaus towards a better and more knowledgeable understanding of the electronic structure of semi-metals through laser experiments performed on carbon.

Along with Ali Javan, Dr. Dresselhaus and their joint student, Paul Schroeder, used a helium-neon laser that emitted circularly polarized light in order to create an updated model for graphite’s electronic structural make up in. These studies were carried out in 1968 and eventually became the forefront of a light scattering technique known as Raman Spectroscopy.

In 1973, Dr. Dresselhaus was the recipient of a Carnegie Foundation grant which enabled her to further promote the participation and incorporation of women in male dominated fields, such as science and engineering. That same year she was also appointed to the Abby Rockefeller Mauze chair in support of women in related STEM fields. Two years after becoming a visiting professor of physics at MIT in 1983, Dr. Dresselhaus accepted the role institute professor thus labeling her as the first female institute professor at MIT.

More recent awards and honors accepted by Dr. Dresselhaus include the 2012 Kavli Prize in Nanoscience, the 2013 Arthur R. Von Hippel Award presented by the Material Research Society, the 2014 Presidential Medal of Freedom presented at the White House by President Obama, and the 2015 IEEE Medal of Honor.

Today, Dr. Dresselhaus is credited as being a historical figure whose studies have led to major breakthroughs in modern electronic technology. She even continues to inspire other women to pursue studies within various science and engineering careers, including physics, through her encouraging words, gracious smile, and kind demeanor.

http://https://www.youtube.com/watch?v=T932NSNSRSE

Weekly Wrap Up (May 20, 2016)

“Set phasers to stun!” As one of the most-beloved sci-fi series of all time, Star Trek has captivated generations. Often praised for its surprisingly accurate scientific applications, choosing to use the fictional “phaser” rather than a laser in the show and films seems uncharacteristic of the franchise. Find out why the creators of Star Trek ommitted the use of lasers in this week’s Science Fiction or Science Fact post by clicking here.

What if you could “print out” a laser so small and inexpensive, it is practically disposable? Research teams in France and Hungary have developed tiny laser systems, using inkjet printing, that would cost mere cents to manufacture. While the widespread use of these “disposable lasers” is held back by the necessity of a high-energy power source, the researchers hope to find a smaller, simpler way to power the technology for future use in biological and chemical sample analysis. Learn more about the exciting process here by clicking here.

One of the innumerable advantages laser technology has given humanity is the ability to learn more about what exists beyond our atmosphere. Specifically, lasers have had a large impact on what we know to be true about our moon. The launch of NASA’s Lunar Reconnaissance Orbiter and Lunar Crater Observation and Sensing Satellite in 2009 helped test one-way laser communications, as well as create 3D maps of the lunar surface. Discover more about the groundbreaking discoveries and more by clicking here.

In 1962, researchers at MIT fired a laser beam at the moon’s surface, in the first successful attempt at “lunar laser ranging.” Lunar laser ranging is the process in which a laser is used to measure the distance between the Earth and the moon. In the last 50 years, the measurements have become more precise; with discrepancies in mere millimeters. These days, however, researchers are running into challenges due to degrading equipment on the lunar surface. Find out more about what lunar laser ranging has taught us about the relationship between the Earth and moon by clicking here

In April, the Photonics Cluster on RWTH Aachen campus held its official grand opening. The facility is designated for research and collaboration between members of the scientific community, with a focus on laser applications. The grand opening event coincided with AKL ‘16 Eurogress, giving nearly 700 individuals the opportunity to view the facility. Learn more by clicking here.

Are you interested in laser safety training, but are unsure if online classes are right for you? Check out our 5 Benefits of Online Laser Safety Officer Training post, where we break down the beneficial aspects of taking laser safety officer courses online. If cost, convenience, or accessibility are preventing you from advancing your laser safety education, online courses may be a perfect solution. Check out the 5 key benefits of our online courses by clicking here.

Should you decide that online courses are suited for you, take a look at our currently offered courses by clicking here.

Imaging at One Trillion Frames per Second

By Ramesh Raskar and Christopher Barsi

High-speed imaging is a long-standing goal in optics, with applications in spectral dynamics, motion analysis, and three-dimensional imaging. Currently, commercially available systems can offer sensors operating at one million frames per second at reduced spatial resolution.1 In the lab setting, serial time-encoding of 2D images have provided 100 ps shutter speeds.2 Recently, researchers at the MIT Media Lab, in the Camera Culture group, led by Professor Ramesh Raskar, have developed a camera system that has an effective time resolution of 2 ps, roughly one half of a trillion frames per second.3

Raskar’s system is centered on repurposing a well-known device called a streak sensor, which is capable of recording 2 ps time scales, and an ultrafast femtosecond Titanium: Sapphire laser. In this system, the laser illuminates a scene of interest, and the streak sensor records the scattered light. Unfortunately, on its own, the streak sensor has several drawbacks. First, with an effective exposure time of 2 ps, the signal-to-noise ratio (SNR) is incredibly low, and any scattered light would be buried in noise. Second, the streak sensor itself has a one-dimensional aperture, so that it can image only a single horizontal line of a scene. Third, given the time resolution, a mechanism must be in place to synchronize the laser with the detector.

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