Overview

• Diodelaser
• Light detectors
• Optical object distance measuring technqiues
• Optomechanical components
• Solid State Laser

Diodelaser

• Development of pulsed and high frequency modulated laserdiodes with CW- and special pulse laserdiodses. Technical data:
  • Wavelength: 635-900 nm
  • Peak power: 10mW-100W
  • Pulse duration: 1ns - 100 us
  • HF-Modulation upto 1GHz

• Control and modulation of laserdiodes with conventional bipolar and MOSFET transistor circuits providing variable pulse width and diode current.

• Control of laserdiodes with avalanche controlled pulse circuits provding fixed pulse width and peak current, but with very low rise times. The pulse width and peak current can paramterized with the choice of the circuit components.

• T-Bias circuits for HF-Modulation of CW-Laserdiodes.

Example of an Avalanche Laserdiodemodule

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Light Detectors

• Development of fast lightdetectors with photodiodes. Technical data:
  • Spectran range: 400-1000 nm
  • Sensitivity: 300V/W - 30kV/W
  • Rise time: 0.5ns - 10 ns

• Use of conventional PIN photodiodes for medium sensitivity range with rise times down to 0.5 ns.

• Use of avalanche amplified diodes for the high sensitivity range with rise times about 0.5 ns.

• Amplification of photdiode signals with broadband and low noise MMIC (Monolithic Microwave Integrated Circuit) technology.

Example of an Avalanche Photodiodemodule

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Optical Distance Measurement

Development and construction of measuring instrumens and systems for contactless object distance measurement with the Time-Of-Flight-Method:

1. A short light pulse is emitted, usually generated by a laserdiode,

2. the light scattered from an object is received, usually with a photodiode,

3. finally the travel time of the light is measured and the object distance can be calculated with the well known velocity of light.

Laboratory Experiment TOF

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Optomechanical Components

Development and manufacture of a optics experimental kit for our own laboratory with the following features:

• flexible
• well designed
• cheap
• compatible with the widly used optomechanical micro system from the Linos company (former Spindler & Hoyer)

Basicelements

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Solid State Laser: Double Pulse Ruby Laser

• Development and manufacture of a special solid state laser using a ruby rod based design. Two laser heads a operated to produce a double laser pulse output with specified pulse delay times.

  Technical data:

  • Emitting Wavelength: 694 nm
  • Pulse energy, each Laserunit: 10-30 mJ
  • Pulse duration: 200 us
  • Double pulse time distance: minimal 0.5 ms
  • Peak Power: 100 W
  • Beam diameter behind mode filter: 1 mm
  • Polarisation of the laser light: linear

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Schematic of one laser unit

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