In this mode, the modulator can be considered an electronically tunable waveplate. 1.2. EO Phase Modulator Versions Thorlabs offers the EO phase modulators in two basic versions: DC-coupled Broadband Version: The electro-optic crystal is directly coupled to the RF modulation input connector, allowing the full bandwidth of the crystal to be utilized.
Electro-Optic Phase Modulator 1.3. Standard Features Broadband DC coupled and High Q Resonant models MgO doped Lithium Niobate crystal Standard Broadband AR coatings cover 400 to 1650 nm range 2 mm diameter clear aperture SMA RF modulation input connector ...
If the frequency modulated signal is viewed with a spectrum analyzer (i.e., with Thorlabs Scanning Fabry-Perot Interferometer), a series of sidebands can be easily observed. These sidebands are an infinite series with each pair of sidebands spaced symmetrically about the fundamental with a separation equal to a multiple of the modulation frequency (i.e.
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Figure 2 Sideband Power Versus Phase Shift Note: At a depth of about 2.4 rad, almost all of the energy is transferred from the fundamental to the sidebands. Laser Spectrum Analyzer Output Showing FM Sidebands Thorlabs Fabry-Perot Interferometer EO Phase Modulator NOVA PHASE THORLABS Electro-Optic...
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Electro-Optic Phase Modulator Sideband Generation Example: Figure 4 below is an actual oscilloscope trace from the output of a scanning Fabry-Perot spectrum analyzer. The modulator was a resonant mode EO-PM operating at 30 MHz and being driven from 8 V peak sine wave.
(gray tracking). Photorefractive limits are a concern in the visible region (400 – 700 nm) particularly with frequency- doubled lasers. The lithium niobate crystals in Thorlabs’ EO modulators are MgO-doped for increased resistance to photorefractive damage. Page 8...
Electro-Optic Phase Modulator Chapter 4 Cleaning and Maintenance Under normal operating conditions, the modulator needs very little, if any maintenance. 4.1. Cleaning the Optics The modulator crystal is recessed inside the housing and under normal conditions, the crystal faces should not need cleaning. If necessary, use a gentle stream of compressed air (dry nitrogen under low pressure or a can of compressed air made specifically for cleaning optics).
Chapter 6 Warranty Information 6.1. General Product Warranty Thorlabs warrants that all products sold will be free from defects in material and workmanship, and will conform to the published specifications under normal use and service when correctly installed and maintained.
(b) ESD sensitive items whose static protection packaging has been opened; (c) items repaired, modified, or altered by any party other than Thorlabs; (d) items used in conjunction with equipment not provided by, or acknowledged as compatible by Thorlabs; € subjected to unusual physical, thermal, or electrical stress;...
7.1. Waste Treatment is Your Own Responsibility If you do not return an “end of life” unit to Thorlabs, you must hand it to a company specialized in waste recovery. Do not dispose of the unit in a litter bin or at a public waste disposal site.
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