Non-electric Laser

In my world, electricity has not yet been discovered, and many advancements in society progress on a purely chemical or mechanical basis.

Lasers are incredibly useful and multifaceted tools, and I would like to be able to include this technology in my world.

I could imagine multiple sources of light (as a ridiculously underpowered example, hundreds of candles) having their light combined and focused through a series of mirrors and lenses to produce a laser-beam.

If so, where could this light come from and how powerful will my laser be?
What other problems might I encounter?

Edit: For clarification, the desired result would be a spatially coherent beam of light.

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Non-electric Laser

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