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Toptica FPI 100 Manual

Fabry-perot interferometer
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FPI 100
Fabry-Perot Interferometer
Manual
Article Number: 34204000.00
Serial Number:
T
Photonics AG
OPTICA
Fraunhoferstrasse 14
82152 Martinsried/Germany
Tel.: ++49 (0) 89 / 89 99 69 - 0
Fax: ++49 (0) 89 / 89 99 69 - 35
email: info@toptica.com
http://www.toptica.com
(June 2001 Subject to changes without notice)

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Summary of Contents for Toptica FPI 100

  • Page 1 FPI 100 Fabry-Perot Interferometer Manual Article Number: 34204000.00 Serial Number: Photonics AG OPTICA Fraunhoferstrasse 14 82152 Martinsried/Germany Tel.: ++49 (0) 89 / 89 99 69 - 0 Fax: ++49 (0) 89 / 89 99 69 - 35 email: info@toptica.com http://www.toptica.com...

  • Page 2: Table Of Contents

    FPI 100 Manual Contents Introduction Theory of Operation Resolution and Finesse Inspection after Delivery Description of Components of the FPI 100 System Mechanics and Optics SC 100 Scan Control (Optional) Photodetector Operation Electronic Setup Optical Alignment 4.2.1 Coarse Cavity Adjustment 4.2.2...

  • Page 3: Introduction

    1. Introduction Introduction The FPI 100 is a piezoelectrically scanned confocal Fabry-Perot Interferometer that combines high finesse (F) and ease of alignment with the flexibility of using it as a stable reference cavity for applications from the UV toIR range of the optical spectrum. Two different mirror radii are available, 75 mm and 18.75 mm, which give a free spectral range (FSR) of 1GHz and 4GHZ, respectively.
  • Page 4 The FPI 100 is intended as a spectral analysis system as well as a stable reference cavity. Its resolution depends on the quality of the mirror coating and surface and is separately specified for each interferom- eter.

  • Page 5: Inspection After Delivery

    2. Inspection after Delivery Inspection after Delivery The FPI 100 is packed in a carton designed to give maximum protection during shipment. If the outside of the shipping carton is damaged, notify your shipping department immediately. The shipping department may wish to notify the carrier at this point.
  • Page 6 FPI 100 Manual 2. Inspection after Delivery In some cases optional accessories are supplied with the FPI 100. Scan Control SC 100 Figure 3 Scan Control SC 100 (optional) PDA 100 Figure 4 Photo Diode Amplifier PDA 100 (optional) Page 5...

  • Page 7: Description Of Components Of The Fpi 100 System

    3. Description of Components of the FPI 100 System Description of Components of the FPI 100 System The FPI 100 System consists of the parts shown in Figure 2. An inside view of the etalon body is given in Fig- ure 5.

  • Page 8: Mechanics And Optics

    3. Description of Components of the FPI 100 System Mechanics and Optics The FPI 100 consists of the coupling optics mounted into a lens barrel, a concave mirror set mounted on a piezo actuator (front mirror) and into the adjusting knob (rear mirror) allowing a smooth, precise position- ing of the cavity spacing and an etalon body picking up the piezo, the lens barrel and the adjusting knob.

  • Page 9: Operation

    Align the laser beam so that it is traveling parallel to the optical table or surface on which the FPI 100 is mounted. Use a mirror or a mirror pair in order to center the laser beam on the aperture of the FPI 100.

  • Page 10: Optimizing The Cavity Alignment

    Fine adjustment of mirror spacing The first step towards attaining the high performance of which the FPI 100 is capable is to set the cavity spacing d equal to the mirror radii r. This is the confocal condition. Therefore a fine adjustment of the mir- ror spacing by slightly turning the adjusting knob (2) has to be accomplished.

  • Page 11: Interferometer Spectres

    See Appendix A for more information and mode matching. Figure 13 shows a portion of one FSR obtained with a properly aligned FPI 100 System. The source was a grating stabilized single mode diode laser working at 780 nm.
  • Page 12 FPI 100 Manual 4. Operation Figure 9 Cavity Spacing is too large by 0.3 mm corresponding to one turn of the Adjusting Knob. Figure 10 Cavity Spacing is too large by 0.15 mm corresponding to a half turn of the Adjusting Knob.
  • Page 13 Knob. Figure 12 Cavity Spacing is almost perfect (d = r). The Locking Screws should now be fastened. The two modes are separated by 1 GHz corresponding to the free spectral range of the FPI 100. Page 12 Status: 16.6.01...
  • Page 14 FPI 100 Manual 4. Operation Figure 13 The Finesse is computed by comparison with Figure 12 and taking the free spectral range into account. The laser used for the measurement had a wavelenght of 780 nm. The photodetec- tor was terminated by 50 Ohms and the signal amplified by 10 Page 13 Status: 16.6.01...

  • Page 15: Fiber Coupling Mounting And Alignment

    Before using the fiber option make sure that the mirror spacing is optimized (see para- graph 4.2.2). In order to achieve the best performance of the FPI 100 it is advisable to use a single mode fiber to couple the laser into the interferometer. However, a quiet good per- formance is also possible by using a multi-mode fiber.

  • Page 16: Changing Mirror Sets

    4. Operation Changing Mirror Sets The FPI 100 offers the flexibility of interchangeable mirror sets for operation at different wavelengths or the alternate FSR. A change of the operating wavelength involves changing the mirrors and it is important also to verify that the proper photodetector is being used.
  • Page 17 CAUTION ! Do not touch the mirrors as this will degrade their performance. When handling the mirrors always wear gloves. Open side cover of FPI 100. Loosen fixing screw (9) and remove lens holder (8). Remove front mir- ror holder (10) with the front mirror by unscrewing it from the piezo.

  • Page 18: Changing Free Spectral Range

    4.4.1 Changing free spectral range The FPI 100 system is designed for a FSR of 1 GHz. It is however also possible to provide a FSR of 4 GHz by changing the mirror sets and the focusing lens. Please contact T Photonics AG for this option.

  • Page 19: Cleaning Of Mirrors

    Remove both mirrors from the FPI 100. See paragraph 4.4 for instructions. Blow all dust from the coated surface of the mirrors using clean, dry gas.

  • Page 20: Troubleshooting

    T Customer Service Department. OPTICA Excessive mode Mechanical vibration coupled to the FPI 100. Remove the source of vibration, noise, peaks jump isolate FPI 100, and/or tighten the locking screws. randomly The back reflection from the etalon may be causing instability in the source laser.
  • Page 21 Excessive high fre- Look for a possible ground loop to other electronics through the base of the unit quency noise and the optical table. Isolate the FPI 100 from the table as necessary. obscuring signal Excessive thermal Shield the etalon assembly from temperature variations. The FPI 100 is designed drift for a temperature stabilization.

  • Page 22: Appendix

    FPI 100 Manual 6. Appendix Appendix Specifications Interferometer Specifications Cavity Design: Confocal spherical mirrors FSR: 1 GHz or 4 GHz Finesse: >100 over specified wavelength range (>300 by request) Coating Ranges Available: 380 to 1700 nm Input Clear Aperture: 5 mm...

  • Page 23: Main Dimensions Of Fpi 100

    FPI 100 Manual 6. Appendix Main Dimensions of FPI 100 Figure 19 FPI 100 Main Dimensions Page 22 Status: 16.6.01...

  • Page 24: Modes Of A Spherical Mirror Interferometer

    FSR equal to the plane mirror value of c/2d for any values of r and d. Finesse The mirror finesse of the FPI 100 Interferometer may be partitioned into contributions from reflectivity (F and surface imperfections (F ).
  • Page 25 The FPI 100 mirrors generally use reflectivities of about 99.7% to achieve a finesse in excess of 300 and a transmission of greater than 10%. These mirrors are available in virtually every spectral range. While...

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