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| Feedback Protection for Diode Lasers: Optical Isolators
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- Excellent feedback protection by high quality polarization optics
- Wide wavelength range available (UV to NIR)
- Single-stage (isolation > 30 dB) and double-stage (isolation > 60 dB) models
- Fine-tuning to application wavelength upon request
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Diode lasers, in particular highly coherent, spectrally narrow external-cavity systems are sensitive to optical feedback from reflecting surfaces such as lenses, mirrors and optical fibers as well as from other laser beams (e.g. optical amplifiers). Whilst weak back-reflections adversely affect the laser’s coherence, strong feedback may lead to irreversible damage of the laser diode itself. We therefore recommend the use of optical isolators to protect your diode laser from unwanted feedback. |
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An optical isolator transmits light in one direction only, by rotating the polarization axis of linearly polarized light. This is achieved by means of a special crystal placed within a strong magnetic field (so-called Faraday effect). The essential components of an isolator are thus an entrance polarizer, the Faraday rotator (crystal surrounded by a permanent magnet) and an exit polarizer oriented at 45° relative to the first polarizer. Since light from diode lasers is usually linearly polarized, the orientation of the entrance polarizer can be made to match the polarization axis. The Faraday element then rotates the polarization axis by 45°; hence the light passes the second polarizer without attenuation. As the Faraday effect is however independent of the direction of light propagation, stray light travelling backwards is completely extinguished by the two polarizers. |
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TOPTICA offers a wide range of optical isolators at attractive prices. Single-stage isolators providing an extinction ratio of > 30 dB are sufficient for most applications including fiber coupling or resonator alignment. For high-power diode lasers and optical amplifiers however, a double-stage isolator with an extinction > 60 dB ought to be used. We can fine-tune the isolators to provide maximum transmission (> 90% per stage) and at the same time maximum extinction at any wavelength of interest. Just let us know what your application is, and we’ll work out the most suitable protection for your diode laser!
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TOPTICA Photonics AG
Lochhamer Schlag 19
82166 Graefelfing (Munich)
Germany
T +49 89 85837-0
F +49 89 85837-200
TOPTICA Photonics Inc.
1286 Blossom Drive
Victor, NY 14564
USA
T 585.657.6663
F 877.277.9897
 sales@toptica.com
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