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How to setup a Littrow laser
Preperation
Before you start to setup/buil the laser you should get everything together, that is needed.
You need
- Laser diode
- Collimation lense
- Grating
- Waveplate (lamda/2) with holder
- Thorlabs collimation tube
- Collimation tool
- Laser housing
- Wavemeter
- Thermal compounds
Getting started
Make sure you are earthed, to avoid ESD!
- Put the laserdiode and the collimation lense into the collimation tube.
- Now use the collimation tool to collimate the beam over a long distance.
- When the beam is well aligned put thermal compound on the tube and put it into the holder.
- Make sure that the beam orientation is in a way that as much as possible lines of the grating will be illuminated.
- Put in the grating and look for a position where the lasing starts.
- Now do a little bit of fine adjustment to set the correct frequency, using a wavemeter. When this is done fix the grating.
- Use the heigth screw to find the lowest current value where the lasing process begins.
- In the end put in the waveplate and align it to get the lowest current setpoint for the lasing process.