our new cleanroom & photonics west 2016!
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In This Issue:Come visit EOT at BiOS & Photonics West2016......................................................................Introducing: Our New Cleanroom!......................................................................Technical Notes: Broadband Isolators
BiOS & Photonics West 2016Come visit EOT in San Francisco, CA,February 1318
Every year, EOT exhibits at several laser industrytrade shows. We will again be attending SPIEPhotonics West this year, February 1618, and invite
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you to Booth 2500 to view our latest technologies,meet with our representatives, and learn more aboutour products.
We are also very excited to be attending SPIEBiOS again this year as well, February 1314. Comevisit us at Booth 8826!
We will be introducing our New! ET2070 Silicon, UVenhanced Photodetector, which features a largeactive area of 2.55mm and a rise and fall time of 3ns.
Introducing: EOT's New & Improved CleanroomIn October of 2015, ElectroOptics Technology moved into its new facility. In the center ofthe building sits a 15,000 square ft. stateoftheart cleanroom. This space wasprofessionally designed to meet specific cleanliness requirements. Most of our generalisolator manufacturing is done in an ISO 6 or Class 1000 cleanroom. EOT is adhering toISO 14644 cleanroom standards, in that, the air is exchanged around 200 times per hourproviding an exceptionally clean work environment. As per the ISO 14644 requirements, ouremployees go through a strategic gowning procedure before entering the cleanroom. Eachyear, the cleanroom will be audited and certified to ensure we are meeting theserequirements. EOT has made this investment to ensure we maintain our leadership positionin high power optical isolators.
ISO 146441 cleanroom standards1
ISO 146441: Classification of air cleanliness· ISO/DIS 146441.2(2014): Classification of air cleanliness by particle concentration· ISO 146442: Specifications for testing and monitoring to prove continued compliancewith ISO 146441· ISO/DIS 146442.2(2014):Monitoring to provide evidence of cleanroom performancerelated to air cleanliness by particle concentration· ISO 146443: Test Methods · ISO 146444: Design, Construction, and Startup· ISO 146445: Operations· ISO 146446: Vocabulary · ISO 146447: Separative devices (clean air hoods, gloveboxes, isolators andminienvironments· ISO 146448: Classification of airborne molecular contamination· ISO 146449: Classification of surface particle cleanliness· ISO 1464410: Classification of Surface Cleanliness by Chemical Concentration· ISO 1464412: Classification of Air Cleanliness by Nanoscale Particle Concentration1 ISO 14644 Standards IEST.org
Technical Notes: BroadbandIsolatorsBroadband Isolators for Ti:Sapphire and OtherTunable Lasers
Some applications, such as isolating individual amplifiers in aTi:Sapphire amplifier chain while maintaining the ability to tunerapidly over the amplifier bandwidth or isolating afemtosecond oscillator from a Ti:Sapphire regenerativeamplifier, require isolators that are wavelength independent.Unfortunately, standard isolators are only capable of providinghigh isolation and transmission over a narrow range ofwavelengths, usually about 3040nm. For this reason wemake broadband isolators. Broadband isolators are unique inthat they are passive devices which provide high isolationand good transmission over a 250nm rangesimultaneously. Below, Figure 1 shows the transmission andisolation of our broadband isolators centered at 800nm. Asthese curves demonstrate, it is possible to construct aFaraday isolator that can provide >30dB isolation and >70%transmission simultaneously over a very large wavelengthrange.
Figure 1: Typical Broadband Isolator Performance
A broadband isolator achieves its wide bandwidth bycompensating for the dispersion in the Faraday rotator optic.While the direction of polarization rotation in a Faraday rotatoris dependent upon the direction of the rotator’s magnetic field,the direction of rotation in a crystal quartz rotator is dependentupon the direction of light propagating through it. By using a45° crystal quartz optical rotator and aligning the Faradayrotator and crystal quartz rotator such that they rotate thepolarization of backreflected light in opposite directions, theisolator becomes less wavelengthdependent. If 45° rotationat the center wavelength is used for both the Faraday rotatorand crystal quartz rotator, the net rotation will be 0° in thereverse direction and 90° in the forward direction.
In femtosecond Ti:Sapphire lasers, pulse broadening causedby dispersion in the Faraday rotator optic is a major concern.Below is the Sellmeiers Equation for TGG:
For more information on our Broadband Isolators, pleasecontact [email protected] or visit our Technical Notes pageon our website, www.eotech.com.