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Faraday Rotator/Isolators
Broadband Isolators for Ti:Sapphire and Other Tunable Lasers:
Some applications, such as isolating individual amplifiers in a Ti:Sapphire amplifier chain while maintaining the ability to tune rapidly over the amplifier bandwidth or isolating a femtosecond oscillator from a Ti:Sapphire regenerative amplifier, require isolators that are wavelength independent. Unfortunately, standard isolators are only capable of providing high isolation and transmission over a narrow range of wavelengths, usually about 30-40nm. For this reason we make broadband isolators. Broadband isolators are unique in that they are passive devices which provide high isolation and good transmission over a 250nm range simultaneously. Other means can be used to increase and isolators' useable wavelength range, but they require manual adjustments such as translating the Faraday rotator optic within the magnetic field or adjusting the polarizers to compensate for the change in rotation angle. It is important to note that while these adjustments will increase an isolators' useable wavelength range, their effective bandwidth still remains ±15nm at any point in time. Figure 5 shows the simultaneous transmission and isolation of our broadband isolators' centered at 800nm and Figure 6 shows the simultaneous transmission and isolation of our broadband isolators centered at 900nm. As these curves demonstrate, it is possible to construct a Faraday isolator that can provide > 30dB isolation and >70% transmission simultaneously over a very large wavelength range.
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