walking the beam §often a laser can work but the beam is not parallel to the bore. §this results...

Walking the Beam Often a laser can work but the beam is not parallel to the bore. This results in serious losses and low output power. If left unchecked this will drastically shorten the tube life.

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Walking the Beam

Often a laser can work but the beam is not parallel to the bore.

This results in serious losses and low output power.

If left unchecked this will drastically shorten the tube life.

Rotate one Mirror slightly

Monitor the output power or the beam current.

Let the output reduce by around 20%

Page 3: Walking the Beam §Often a laser can work but the beam is not parallel to the bore. §This results in serious losses and low output power. §If left unchecked

Rotate the other mirror in the same direction

Regain the power by rotating the opposite mirror.

Seek a local maximum.

Page 4: Walking the Beam §Often a laser can work but the beam is not parallel to the bore. §This results in serious losses and low output power. §If left unchecked

Repeat until maximum power is obtained

Rotate the first mirror again.

An overall maximum will eventually be reached.

Page 5: Walking the Beam §Often a laser can work but the beam is not parallel to the bore. §This results in serious losses and low output power. §If left unchecked

Tuning

Tuning is similar to walking.Only one mirror is rotated to seek a local

maximum.The other mirror is left untouched.

Page 6: Walking the Beam §Often a laser can work but the beam is not parallel to the bore. §This results in serious losses and low output power. §If left unchecked

Other Applications

Walking is also used to launch optical fibres and align complex systems like the multi-photon and UV confocals.

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