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Old 08-03-2014, 03:05 AM #1
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Default Ring Cavity Direct Doubling?

I'll keep this brief as I don't have power so on my phone.

Been thinking of direct doubling recently.

Aside from diode linewidth, what is stopping us from using a ring cavity to direct double?

I.E. Sending the pump source through a partly transmissive OC not at 90 (about 80) and then that input would travel to a crystal cut to Brewster angle.

This would allow for an offset in the beam direction, and you could create a stable resonator without sending light back to the diode.

I will draw up something and upload it when I have power.

For now, google "ring cavity" for your brain food


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Old 08-03-2014, 04:13 AM #2
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Default Re: Ring Cavity Direct Doubling?

My guess is that it's linewidth, to be honest. I've thought about myriad ways to direct double, and it all comes down to the fact that you need a narrow line for your pump :\
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Old 08-03-2014, 04:10 PM #3
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Default Re: Ring Cavity Direct Doubling?

On the bright side, they make mirrors that are HT@808nm @45, then HR @808nm @90.

So for green it'd be great. Though this is the only wavelength that they make such specialty optics for.

I've calculated for both 99.9% HR and HT. Both give the same intracavity power.

So linewidth is still our greatest enemy. I saw a PZT in the D3 430nm (direct diode doubled). Not sure what role it plays.
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405nm 500mW
442nm 15mW Melles Griot HeCd
445nm 1W
455nm 100mW LaserBTB
457nm Tunable OMNI 532
465nm Tunable OMNI 532
467nm 1.8W NDB7675
472nm Tunable Omni 532
473nm 2x 100mW Melles Griot lab heads w/ PSUs
476nm Tunable OMNI 532
488nm Single line 35mW
496nm Tunable OMNI 532
502nm Tunable OMNI 532
514nm Tunable OMNI 532
520nm 40mW MSV2
532nm Various pointers
543nm GreeNe 2mW
568nm ~20mW ArKr whitelight line
589nm 126mW PGL-III-C
594nm Rigel-6; 4.75mW + <1mW
604nm 2x <1mW multiline
609nm Ne Penning mixture Ar line from REO 612nm
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635nm Raman 6 line
638nm 20mW single mode
640nm Raman 6 line
647nm ~10mW ArKr whitelight Kr line
650nm Raman 6 line
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685nm 20mW
808nm Modded NewWish pen


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Old 09-14-2014, 12:39 AM #4
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Default Re: Ring Cavity Direct Doubling?

External Bow Tie or Ring doubling cavities have one mirror on a piezo to phase match the diode laser.
Even stabilized diode lasers wander like crazy in frequency. So active electronics are used to peak the power, often using Pound Drever Hall or Peak Power locking.

A hobbyist would use a tiny ramp with DC offset to sweep the piezo to get a flash, and worry about locking later.


Cavity length Requirement:
((C* Lambda/2L(delta cavity)) length must equal a integer half multiple of ((C* Lambda/2L (Source)) At near IR and Visible wavelengths, The integer can and will be huge, and there are many, many integer multiples that will work for a given setup. So there is a "band" of motion it will lock over. If the Cavity has a enough of a FSR (Free Spectral Range) you will see it lock and fade out in a sinusoidal pattern as you move the piezo.

In fact if using analog Pound Drever Hall locking, you'll always put a slight modulation on the cavity so the lock-in amplifier will guide the piezo.

The other technique is to use a brute force Q-switched pump laser and not worry about most of the locking crap. Frequency conversion for the most part is best done using high peak powers.

Interesting quantum mechanical conundrum, as the external cavity approaches lock to the source laser, the mirror in which the pump beam enters effectively partially disappears. (there are a host of conditions required for this to happen).

Never built one, but have been in the room with them. Have adjusted/peaked one long,long,long long, ago.

Attached is TWO PDFs used under educational provisions of copyright law. I will remove these PDF in one week.

Note the second PDF using a polarization locking scheme without a P-D-H reference or a Lock-In Amplifier to drive the Piezo. While used Lock-Ins are cheap...... This might be easier if you have less/zero/no electronics skills.

I have these PDFs from a past need for a UV laser for Raman Spectroscopy.
The project was abandoned because the professor had no idea of what he was doing, so I never built one.

Note, no laboratory CW Laser experimenter in their right mind lives without a Lock-In Amplifier. Older beat up simple ones are the best. One should at least learn what one does. The math used to explain it is high school algebra I. They are all over Ebay.

Quick explanation: A Lock-In finds signals below the system noise, provided you can import a modulation on the signal to be found and give it time to average the signal from the noise. It returns the magnitude and phase of the signal.

One should start with 1064->532 as that is tricky enough for a beginner, but has the most chance of success. A 532 ring cavity could come from very inexpensive Casix parts. However I'd build a two or three mirror 532 nm conventional laser before I tried rings or exotics. One should crawl before one walks, there are many things to be learned before jumping to the high end.

Attached is TWO PDFs used under fair educational provisions of copyright law. I will remove these PDF in three days.


Steve

Last edited by LSRFAQ; 09-20-2014 at 07:30 PM. Reason: Deleted copyright material per tems of EDu use.
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