Dye laser pumped with a TEA CO2 laser ! ?

[femtoman]

Pumping a dye laser with a CO2 TEA laser is it that possible?

[mixedgas]

Focus the plasma ball in argon or xenon or maybe... Nitrogen and hope for a high peak power flash similar to N2 laser?

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CW short arc lamp pumped dye lasers have been built, just the output powers are miniscule and the lamps were huge.
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Steve

[VDX]

... maybe interesting? - http://www.feha-laser.de/en/products/microstormtm/

Viktor

[femtoman]

Focus the plasma ball in argon or xenon or maybe... Nitrogen and hope for a high peak power flash similar to N2 laser?

+
CW short arc lamp pumped dye lasers have been built, just the output powers are miniscule and the lamps were huge.
+
Steve

Hello Steve,
You are near the solution !

I will make in the next day this dye laser ..................
CO2 TEA laser beam dimension at the concave cylindrical Mirror will be Horizontal 32mm vertical 15mm and only the vertical direction is focalized on the quartz tube to have a quartz plasma emitting UV to pump the laser dye.(you not need argon or xenon )

[femtoman]

[QUOTE=femtoman;323313]Hello Steve,

You are near the solution !

I will make in the next day this dye laser ..................
CO2 TEA laser beam dimension at the concave cylindrical Mirror will be Horizontal 32mm vertical 15mm and only the vertical direction is focalized on the quartz tube to have a quartz plasma emitting UV to pump the laser dye.(you not need argon or xenon )

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[planters]

I understand your design. Firstly, can you generate a plasma if the CO2 is focused to a line rather than a point? This one dimensional compression will give a substantially lower peak energy density. If you are successful in generating a plasma line, the line width will indeed be thin. You need to focus this effectively or generate it extremely close to the dye in order for the energy density to be maintained within the dye. I was playing with one of my dye lasers today and placed two HR (99.5%) plano mirrors as cavity optics to determine the effect on threshold. It is profound even though the output slope is very slow. I would recommend that you do the same.

One limitation with your design is that the position of 10.6um focus will be the position where the plasma line will in turn, be collimated. If you tilt the CO2 focusing cylinder perpendicular to the plane of the drawing then the IR focus could be directed in front of or behind of the plane of the drawing. This would allow you to place a focusing mirror around the plasma to recover and concentrate the UV light that does not directly strike the capillary tube.

Good luck.

[femtoman]

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I understand your design. Firstly, can you generate a plasma if the CO2 is focused to a line rather than a point?


Yes, it think it is possible because to make an optical breakdown on a surface (metal or in my case quartz) we need 100 times less power per square centimeter (W/cm2) that the optical breakdown in a gas !
I will start tomorow the construction of this laser .

This one dimensional compression will give a substantially lower peak energy density. If you are successful in generating a plasma line, the line width will indeed be thin.

The line width is thin approximatively 0.1 to 0.2 mm in the video you see a big plasma ball because the camera saturated, in reality when you show with yours eyes the spark is very small.


You need to focus this effectively or generate it extremely close to the dye in order for the energy density to be maintained within the dye. I was playing with one of my dye lasers today and placed two HR (99.5%) plano mirrors as cavity optics to determine the effect on threshold. It is profound even though the output slope is very slow. I would recommend that you do the same.

With a dye capillary tube of 1mm diameter and a short pulse 1 microsecond and a pumping length of 30mm and a dye concentration of 10^-4 Mol i am sur that without a resonateur i will obtain a superradiante emission .......

One limitation with your design is that the position of 10.6um focus will be the position where the plasma line will in turn, be collimated. If you tilt the CO2 focusing cylinder perpendicular to the plane of the drawing then the IR focus could be directed in front of or behind of the plane of the drawing. This would allow you to place a focusing mirror around the plasma to recover and concentrate the UV light that does not directly strike the capillary tube.

To obtain optical breakdown in air at 10.6 micron and 1 microsecond you need 2.10⁷ W/cm2 .
To obtain optical breakdown on the quartz (100 time less) that is 2.10⁵W/cm².
The surface illuminated on the dye cell will be 0.2x32mm = 6.4 mm²
The dye section illuminated is 1x32mm² with a flux of 2MW that is 6MW/cm2 that very good for optical pumping on dyes !
If i considere 20% of the plasma light go Inside the dye cell to pump the dye volume 25mm³ ; that is 2J in 1.10^-6 s
With 0.01% yield that is 2mJ laser output !

Good luck.

Thanks!

[planters]

Yes, I see. I had misread the design. I thought you were placing the capillary NEAR the point of an AIR breakdown. Surface breakdown is much less demanding. How erosive do you believe the laser will be to the surface? Will you have to translate the tube as you continue to strike its surface? In any case I am fairly confident this will work.

[danielbriggs]

Can you focus your CO2 laser onto some tiny bits of Sn? Get enough of that 13.5nm light and you'll change the semiconductor industry overnight

In all seriousness, your posts are always interesting; the forum should have more like this.

[planters]

In all seriousness, your posts are always interesting; the forum should have more like this.

Agreed!

Cymer has built some outrageously powerful CO2 lasers for that purpose. Something like 10's of kW average power to hope to generate 100W @ 13.5nm. This is all at 10's of kHz as well. Not to mention that they have to hit a micron sized tin droplet flying in front of the focus. Gasp!

Your TEA laser, as I've said before, has a long pulse duration. This plan to drive the dye would become even more advantageous if the ionization occurred in nanoseconds.