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SA210 Series

Fabry Perot Interferometer

User Guide

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Summary of Contents for SA210 Series

Page 1: ...SA210 Series Fabry Perot Interferometer User Guide ...

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Page 3: ...apter 4 Fabry Perot Interferometry 4 4 1 Free Spectral Range 4 4 2 Finesse 5 4 3 Spectrum Analyzer Controller and Other Accessories 5 Chapter 5 Setup 6 5 1 Recommended Set up 6 Chapter 6 Alignment 7 Chapter 7 Specifications 8 Chapter 8 Regulatory 9 8 1 Waste Treatment is Your Own Responsibility 9 8 2 Ecological Background 9 Chapter 9 Thorlabs Worldwide Contacts 10 ...

Page 4: ...mbol Description Direct Current Alternating Current Both Direct and Alternating Current Earth Ground Terminal Protective Conductor Terminal Frame or Chassis Terminal Equipotentiality On Supply Off Supply In Position of a Bi Stable Push Control Out Position of a Bi Stable Push Control Caution Risk of Electric Shock Caution Hot Surface Caution Risk of Danger Warning Laser Radiation Caution Spinning ...

Page 5: ...this instruction manual will only apply when the unit is operated correctly Please read the following warnings and cautions carefully before operating the device WARNING Take appropriate measures for eye safety Never look directly into the beam not even at the output of the SA210 SHOCK WARNING Never touch the output of the SA210 PZT driving unit ...

Page 6: ... separation with a piezoelectric transducer the cavity acts as a very narrow band pass filter Knowing the free spectral range of the SA210 allows the time base of an oscilloscope to be calibrated to facilitate quantitative measurements of a laser line shape 3 1 Confocal Cavity Configuration Mirrors shown below are AR coated on the outer surfaces and HR coated on the inner surfaces FSR c 4d Availab...

Page 7: ...vity at a height h parallel to the optical axis of the cavity makes a triangular figure eight pattern as it traverses the cavity From this pattern it is clear that the ray makes four reflections from the cavity mirrors instead of the two that would result in a plano plano cavity Hence the total round trip path through the cavity is given as 4d instead of 2d Figure 1 This figure shows a simplified ...

Page 8: ...the Taylor criteria for being resolvable they are separated by their common FWHM as shown in the plot 4 3 Spectrum Analyzer Controller and Other Accessories The SA201 controller generates a voltage ramp which is used to scan the separation between the two cavity mirrors A photodiode is used to monitor transmission of the cavity Using the output sync signal from the controller an oscilloscope can b...

Page 9: ...on the piezo ramp in is not to exceed 150 V If the detector is connected directly to the scope a 5 kΩ terminator is needed Offset adjustment SA201 is used to center the output on the scope 5 1 Recommended Set up In a typical application the SA210 Interferometer is used in conjunction with a signal generator and an oscilloscope as shown below A signal generator Thorlabs SA201 Fabry Perot Controller...

Page 10: ...se the input iris to its minimum aperture and center the beam on the iris opening Leave the back iris completely open and start to scan the unit Use the mirror mount s tip tilt adjustment until the beam is centered through the body of the SA210 Adjust the oscilloscope gain to maximize sensitivity position the detector close to the rear opening and slowly close the back iris while adjusting mirror ...

Page 11: ...Material Black Anodized Aluminum Fabry Perot Cavity Material2 Low thermal expansion Invar Dimensions Ø1 Flange Total Length 2 93 1 FSR is set by the length of the confocal cavity and is given by FSR c 4d Where d is the radius of curvature of the mirrors in this case d 7 5 mm 2 A thermal design balances the small coefficient of thermal expansion of the Invar body with the negative coefficient of th...

Page 12: ...to other Thorlabs 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 8 1 Waste Treatment is Your Own R...

Page 13: ...USA Canada and South 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 thorla...

Page 14: ...www thorlabs com ...

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