![]() Note that you can also receive the articles in the form of a newsletter or with an RSS feed. You may link to this page and cite it, because its location is permanent. DK Photonics from Shenzhen, China, offers high quality fiber-optic components for applications in. This article is a posting of the Photonics Spotlight, authored by Dr. RP Photonics Encyclopedia and Buyers Guide. The degree of isolation possible with that setup can be substantially higher than with a Faraday isolator alone.īut of course this works only when your setup can work with circularly polarized light and does not change the polarization of back-reflected light. Normally, it would get through this and be blocked only by the input polarizer. There is a way to combine both methods: just place a λ/4 waveplate after a Faraday isolator, again with 45° of its axis against the polarization direction.Īssuming that the polarization state of the back-reflected light has not been changed, the waveplate will transform that into linearly polarized light such that the light cannot pass even the output polarizer of the isolator. Its polarization direction is rotated by 90°, so that it will be blocked by the polarizer and thus cannot get back to the laser source. Send the beam through a polarizer first, then through a λ/4 waveplate, with the waveplate's axis being oriented at 45° against the polarization direction.Īny light reflected back after the waveplate will do a double pass through it, so that it effectively sees a λ/2 plate. Mostly, Faraday isolators are used for this purpose.īut there is a simple substitute, which will do the job in some cases: in Q switches and other optical modulators. Sometimes we need an optical isolator for suppressing back reflections from a device which might, for example, disturb a laser source. Note that thermal lensing may occur not only in the laser gain medium, but also in other optical components, e.g. ![]() EDFA Applications EDFA uses Er-Doped Fiber (EDF) as the gain medium. ![]() Ref.: encyclopedia articles on Faraday isolators and waveplates DK Photonics offers a large selection of passive optical components use for fiber laser.Such as 1064nm high power isolator,Cladding Power Stripper,Pum. However, this approach has its limitations. Rüdiger Paschotta, RP Photonics AGĪbstract: It is explained that a simple combination of a polarizer and a quarter waveplate can sometimes be used instead of a Faraday isolator. Posted on as a part of the Photonics Spotlight (available as e-mail newsletter!)Īuthor: Dr.
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(Messages may be quoted by name unless the writer stipulates otherwise.) You can tweet suggestions, links, and questions to Tweet us your cocktail chatter using #cocktailchatter. Research and show notes by Bridgette Dunlap. Visit megaphone.New York's luxury condo boom half a decade ago, fueled largely by foreign buyers seeking discretion and big returns. Six years later, residents of the exclusive tower are now at odds with the developers, and each other, making clear that even multimillion-dollar price tags do not guarantee problem-free living. I laughed out loud at the part where they explain they got around the height limits by just building certain floors with ridiculously tall ceilings. 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DOWNSIDE LIFE SUPERTALL TOWER CREAKS BREAKS PLUS.Another buyer bought two condos in the same building for a combined $157.5 million, nearly a 54% increase from the two unit’s combined sale prices the previous year. In May, a three-bedroom apartment at 220 Central Park South, thought to be the city’s most expensive residence, sold for $33 million, the full asking price and almost a quarter more than the seller paid for the property in 2019. ![]() Recent data indicates the city is beginning to buck the trend. According to the WSJ, the pandemic and concurrent anti-racism protests in the city hurt high-priced New York real estate even more than the September 11 terrorist attacks. Luxury real estate appears to be on the rise again after being battered during the coronavirus pandemic. He made his fortune in real estate and retail. 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Two cast iron figural pieces with paintedTwo cast iron figural pieces with painted finish, early 20th C., details include: "Mammy" bank with red and white painted finish, 5" h.Assorted Black Americana Items: AssortedAssorted Black Americana Items: Assorted Black Americana items comprising two painted cooking figural wall hooks (male & female, 5"h) and two cast iron.Black Americana Cast Iron Figures - Mamm圜onsistingBlack Americana Cast Iron Figures - Mamm圜onsisting of Mammy bank 11.5'' H along with Bojangles clock figure with banjo 15.5'' H circa mid-20th century.And a ''Cotton'' toothpick holder with two black boys. 1900, together with two Mammy banks and a doorstop. 1900,Jolly Black Man mechanical bank, ca. Unpainted five-piece mammy bank with hands on hips, welded together at base and arms. cast metal banks including two mammys, two bank buildings and one safe, details include: two mammy banks, one holding basket Mechanical and still banks of all varietiesįinal thoughts, old cast iron toys and banks will be heavier than their newer counterparts and taking advantage of your own common sense while shopping will also serve to keep you from investing in a fake.Just a few examples of appraisal values for Mammy bank.Use a small magnet to check the piece for hidden repairs that may be made using an epoxy or aluminum. A black light is also good in detecting repairs and repainted areas. They are invaluable for detecting new paint as it will fluoresce old paint will not. Take a portable, battery-op black light along when shopping. Some of the more common toys and banks being reproduced are: Old cast iron toys and banks can be quite valuable – just exercise care when shopping. Old cast iron (pre-1940) should not have Phillips Head Screws.The images below give some close-ups of what to look for on an original piece. Be wary as some will soak new cast iron in chemicals to age or bury in the ground to ‘age’. Old cast iron items that have rusted tend to be dark brown/black while new cast iron will lean towards red or reddish brown. Old cast iron that is unpainted tends to be dark brown or black newer cast iron tends to be dirty silver or gray. Simulated wear will display a consistent, repeated pattern. When reviewing a painted piece look for uneven wear and random scratching. Also old paint – typically enamel or oil based – will tend to chip where as the newer acrylic paint will not. When buying cast iron banks, look for paint on both the outer and inner edges of the slot. Inspect the paint for brush marks, and look for drip deposits on underside of toy – old toys will exhibit these. Old painted cast iron was usually dipped not spray painted like new repros. Old toys were typically fitted by hand with the edges being smoothed and you are less like to see any gaps. Look for these ‘gap leaks’ to show grind marks in an effort to make the seam smooth. Old cast iron toys will have better details and cleaner edges while new fakes tend to show leakage at the seams since the new molds aren’t as well fitted as the old molds. So check the underside of any cast iron toy for these flaws. These are hard to see if the piece is painted. Repros may display bumps, holes or pits on the surface. ![]() Old cast iron toys will have a much smoother surface than it’s new fake. Add to that the fact that some of the old molds are being used to produce new-old toys, you’ve got to know what to look for.īelow are some tips to follow when shopping for cast iron toys and banks. The digital world has made it easy to copy marks and items with paper lithos. 1930’s AC Williams Mack Cast iron Stake Truck However, if you shop with a critical eye and a bit of knowledge, you can keep from spending your hard earned dollars on a worthless modern reproduction cast iron toy or bank. Old toys seem to increase in value each year making them a prime target for those who would sell fakes and reproductions as the ‘real deal’. |
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