THORLABS EO-PM-NR-Cx Operating Manual Download Page 7

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Chapter 2: Setup

Page 6

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.

Figure 3 Typical Setup for Sideband Generation

Showing FM Sidebands

Thorlabs Fabry-Perot

NOVA PHASE

Electro-Optic

Phase Modulator

Laser

Glan Thompson

Polarizer

EO Phase Modulator

RF Drive Signal

Interferometer

Spectrum Analyzer Output

THORLABS

Electro-Optic

Phase Modulator

Summary of Contents for EO-PM-NR-Cx

Page 1: ...EO PM NR Cx EO PM R 20 Cx Electro Optic Phase Modulator Operating Manual ...

Page 2: ...and Maintenance 9 4 1 Cleaning the Optics 9 4 2 Cleaning the Modulator Housing 9 Chapter 5 Mechanical Drawings 10 Chapter 6 Warranty Information 11 6 1 General Product Warranty 11 6 2 Opto Mechanics 11 6 3 Optical Tables and Breadboards 11 6 4 Lasers and Imaging Systems 11 6 5 Opto Electronics Control Electronics Optics and Non Positioning Product Lines 11 6 6 Warranty Exclusions 12 Chapter 7 Regu...

Page 3: ...ill also occur but with approximately 30 less efficiency than for vertical polarization r13 r33 30 for Lithium Niobate If the input polarization is at 45 the output polarization will undergo a change from linear to elliptical 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...

Page 4: ...ed mounting holes on bottom Custom OEM versions available 1 4 EO PM Specifications Specification Value Modulator Crystal MgO Doped Lithium Niobate LiNbO3 Wavelength Range C1 600 to 900 nm C2 900 to 1250 nm C3 1250 to 1650 nm C4 400 to 600 nm Clear Aperture 2 mm diameter Input Connector SMA Female Halfwave Voltage V Non Resonant 135 V 633 nm See Figure 1 Halfwave Voltage V Resonant 15 V 633 nm Inpu...

Page 5: ...r 1 Description Page 4 0 50 100 150 200 250 300 350 400 450 400 600 800 1000 1200 1400 1600 Half Wave Voltage Wavelength nm EO PM Halfwave Votage vs Wavelength Non Resonant Resonant Figure 1 Halfwave Voltage ...

Page 6: ...e frequency as the modulating signal This phase modulation will result in a frequency modulation of the optical signal 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 wit...

Page 7: ...is transferred from the fundamental to the sidebands Figure 3 Typical Setup for Sideband Generation Showing FM Sidebands Thorlabs Fabry Perot NOVA PHASE Electro Optic Phase Modulator Laser Glan Thompson Polarizer EO Phase Modulator RF Drive Signal Interferometer Spectrum Analyzer Output THORLABS Electro Optic Phase Modulator ...

Page 8: ...l 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 Vpeak sine wave Note the suppression of the fundamental center band indicating a very good depth of modulation 2 1 rad Figure 4 Sideband Generation Sample ...

Page 9: ...ractive effects which lead to color center formation and progressively increasing absorption Photorefractive damage is noted by increase scattering and absorption in the optical path along with gray appearance in the crystal 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 modu...

Page 10: ...tle stream of compressed air dry nitrogen under low pressure or a can of compressed air made specifically for cleaning optics WARNING Damage may result from excessive cleaning air pressure or if condensation is allowed to build up from using a stream of compressed air from an inverted can 4 2 Cleaning the Modulator Housing The housing can be wiped clean with a lint free rag wetted with propanol or...

Page 11: ...Chapter 5 Mechanical Drawings Page 10 Chapter 5 Mechanical Drawings ...

Page 12: ...be free from defects in workmanship including de lamination of the skins under normal use and handling 6 4 Lasers and Imaging Systems Thorlabs offers a one year warranty on all lasers and imaging systems with the exceptions of laser diodes Some products are warranted for the number of hours specified in the operating manual of each laser 6 5 Opto Electronics Control Electronics Optics and Non Posi...

Page 13: ... 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 f damaged due to improper installation misuse abuse or storage g damaged due to accident or negligence ...

Page 14: ...s products such as Pure OEM products that means assemblies to be built into a unit by the user e g OEM laser driver cards Components Mechanics and optics Left over parts of units disassembled by the user PCB s housings etc If you wish to return a Thorlabs unit for waste recovery please contact Thorlabs or your nearest dealer for further information 7 1 Waste Treatment is Your Own Responsibility If...

Page 15: ...America Thorlabs Inc sales thorlabs com techsupport thorlabs com Europe Thorlabs GmbH europe thorlabs com France Thorlabs SAS sales fr thorlabs com Japan Thorlabs Japan Inc sales thorlabs jp UK and Ireland Thorlabs Ltd sales uk thorlabs com techsupport uk thorlabs com Scandinavia Thorlabs Sweden AB scandinavia thorlabs com Brazil Thorlabs Vendas de Fotônicos Ltda brasil thorlabs com China Thorlabs...

Page 16: ...www thorlabs com ...

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