JTK Notebook - Revision history

Karpel: /* Projects */

2016-07-15T18:29:23Z

Projects

← Older revision		Revision as of 18:29, 15 July 2016
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	== Projects ==		== Projects ==

	[[Ti:Sapph Laser]]		[[Ti:Sapph Laser]] [https://github.com/JoshKarpel/cavities GitHub Link]

	[[Ionization]]
			[[Ionization]] [https://github.com/JoshKarpel/ionization GitHub Link]


			To see the code you'll need to be added as a collaborator. Email me at karpel@wisc.edu or josh.karpel@gmail.com and let me know the email on your GitHub account and I'll add you.

	== To Do ==		== To Do ==

Karpel: /* Projects */

2016-07-15T18:27:03Z

Projects

← Older revision		Revision as of 18:27, 15 July 2016
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	[[Ti:Sapph Laser]]		[[Ti:Sapph Laser]]
			[[Ionization]]

	== To Do ==		== To Do ==

Karpel at 14:37, 3 September 2015

2015-09-03T14:37:21Z

← Older revision		Revision as of 14:37, 3 September 2015
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	===== Short Term =====		===== Short Term =====
	* ~~Do absorption measurements on our~~ Ti:sapph ~~crystal~~		* Assemble Ti:sapph laser
	* Figure out positioning of cavity elements/prep for cavity assembly

	===== Long Term =====		===== Long Term =====
	* Assemble Ti:sapph laser
	* Build box for Ti:sapph laser		* Build box for Ti:sapph laser

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	* Aligned blue beam through crystal. Very cool! Crystal mount holds at 15 deg C easily. Possible concerns over difference between this temperature and the internal temperature of the crystal inside the beam path, but we don't have a way to measure that. Ran for ~1 hour, no visible signs of damage. Not too worried.		* Aligned blue beam through crystal. Very cool! Crystal mount holds at 15 deg C easily. Possible concerns over difference between this temperature and the internal temperature of the crystal inside the beam path, but we don't have a way to measure that. Ran for ~1 hour, no visible signs of damage. Not too worried.
	* Took a first run at the absorption measurement. 2.8 W in, 1 W made it through the crystal, which is 64% absorption if true - doubtful. We're only measuring transmission, so we can't be sure that the full 2.8 W is incident on the crystal. Probable pre-crystal loss mechanisms: scattering, polarization/Brewster losses (although we seem to have landed very close on our rough alignment).		* Took a first run at the absorption measurement. 2.8 W in, 1 W made it through the crystal, which is 64% absorption if true - doubtful. We're only measuring transmission, so we can't be sure that the full 2.8 W is incident on the crystal. Probable pre-crystal loss mechanisms: scattering, polarization/Brewster losses (although we seem to have landed very close on our rough alignment).
			* Added green dots to diode tube and mount - when the dots are lined up the output is coming out p-polarized relative to the crystal. Note that rotating the diode tube changes the beam path because I'm bad at machining, so it won't be aligned if you rotate it anyway.

	'''2015-8-31'''		'''2015-8-31'''

Karpel at 20:16, 2 September 2015

2015-09-02T20:16:43Z

← Older revision		Revision as of 20:16, 2 September 2015
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			== Projects ==

			[[Ti:Sapph Laser]]

	== To Do ==		== To Do ==

Karpel at 17:03, 2 September 2015

2015-09-02T17:03:57Z

Show changes

Karpel: /* Log */

2015-09-02T14:42:53Z

Log

← Older revision		Revision as of 14:42, 2 September 2015
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	* Measured diode current vs power curve. Max is 2.8 W of output power at 3 A input current.		* Measured diode current vs power curve. Max is 2.8 W of output power at 3 A input current.
	* Drilled a hole in the top of the crystal mount to add a set screw. Slathered the inside of the hole with thermal paste, slipped the crystal in, and tightened the set screw. Crystal is held quite solidly! May still have to redesign at some point, but this will definitely work for now. Some concern over thermal paste on sides of crystal, may want to clean it off at some point.		* Drilled a hole in the top of the crystal mount to add a set screw. Slathered the inside of the hole with thermal paste, slipped the crystal in, and tightened the set screw. Crystal is held quite solidly! May still have to redesign at some point, but this will definitely work for now. Some concern over thermal paste on sides of crystal, may want to clean it off at some point.
			* Aligned blue beam through crystal. Very cool! Crystal mount holds at 15 deg C easily. Possible concerns over difference between this temperature and the internal temperature of the crystal inside the beam path, but we don't have a way to measure that. Ran for ~1 hour, no visible signs of damage. Not too worried.
	* Took a first run at the absorption measurement. 2.8 W in, 1 W made it through the crystal, which is 64% absorption if true - doubtful. We're only measuring transmission, so we can't be sure that the full 2.8 W is incident on the crystal. Probable pre-crystal loss mechanisms: scattering, polarization/Brewster losses (although we seem to have landed very close on our rough alignment).		* Took a first run at the absorption measurement. 2.8 W in, 1 W made it through the crystal, which is 64% absorption if true - doubtful. We're only measuring transmission, so we can't be sure that the full 2.8 W is incident on the crystal. Probable pre-crystal loss mechanisms: scattering, polarization/Brewster losses (although we seem to have landed very close on our rough alignment).

Karpel: /* Log */

2015-09-02T14:37:54Z

Log

← Older revision		Revision as of 14:37, 2 September 2015
Line 23:		Line 23:
	* Measured diode current vs power curve. Max is 2.8 W of output power at 3 A input current.		* Measured diode current vs power curve. Max is 2.8 W of output power at 3 A input current.
	* Drilled a hole in the top of the crystal mount to add a set screw. Slathered the inside of the hole with thermal paste, slipped the crystal in, and tightened the set screw. Crystal is held quite solidly! May still have to redesign at some point, but this will definitely work for now. Some concern over thermal paste on sides of crystal, may want to clean it off at some point.		* Drilled a hole in the top of the crystal mount to add a set screw. Slathered the inside of the hole with thermal paste, slipped the crystal in, and tightened the set screw. Crystal is held quite solidly! May still have to redesign at some point, but this will definitely work for now. Some concern over thermal paste on sides of crystal, may want to clean it off at some point.
	* Took a first run at the absorption measurement. 2.8 W in, 1 W made it through the crystal, which is 64% absorption if true - doubtful. Probable loss mechanisms: scattering, polarization/Brewster losses (although we seem to have landed very close on our rough alignment).		* Took a first run at the absorption measurement. 2.8 W in, 1 W made it through the crystal, which is 64% absorption if true - doubtful. We're only measuring transmission, so we can't be sure that the full 2.8 W is incident on the crystal. Probable pre-crystal loss mechanisms: scattering, polarization/Brewster losses (although we seem to have landed very close on our rough alignment).

	'''8/31/2015'''		'''8/31/2015'''

Karpel at 14:36, 2 September 2015

2015-09-02T14:36:59Z

← Older revision		Revision as of 14:36, 2 September 2015
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	===== Short Term =====		===== Short Term =====
	* Hook up water chiller to diode mount (once it arrives...)
	* Build crystal mount (have both parts now)
	* Do absorption measurements on our Ti:sapph crystal		* Do absorption measurements on our Ti:sapph crystal
	* Figure out positioning of cavity elements/prep for cavity assembly.		* Figure out positioning of cavity elements/prep for cavity assembly

	===== Long Term =====		===== Long Term =====
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	* Ti:sapph cavity saturable absorber		* Ti:sapph cavity saturable absorber
		⚫	* Blue optics (cylindrical-lens telescope, focusing lens) (maybe not necessary)
	* Ti:sapph extracavity optics
			* Optical breadboard
⚫	* Blue optics (cylindrical-lens telescope, focusing lens)
	* FS prism pair
	* Spare thermistors and TECs
	* λ/2 waveplate for pump beam

	== Log ==		== Log ==

			'''9/1/2015'''
			* Measured diode current vs power curve. Max is 2.8 W of output power at 3 A input current.
			* Drilled a hole in the top of the crystal mount to add a set screw. Slathered the inside of the hole with thermal paste, slipped the crystal in, and tightened the set screw. Crystal is held quite solidly! May still have to redesign at some point, but this will definitely work for now. Some concern over thermal paste on sides of crystal, may want to clean it off at some point.
			* Took a first run at the absorption measurement. 2.8 W in, 1 W made it through the crystal, which is 64% absorption if true - doubtful. Probable loss mechanisms: scattering, polarization/Brewster losses (although we seem to have landed very close on our rough alignment).

			'''8/31/2015'''
			* Finished water chiller assembly and tested it. Many possible settings give OK performance, but I the best performance is when the water temperature is as low as possible (10 deg C), with the diode mount held at 20 deg C with the full 3 A of current running.

	'''8/14/2015'''		'''8/14/2015'''

Karpel at 16:02, 14 August 2015

2015-08-14T16:02:57Z

← Older revision		Revision as of 16:02, 14 August 2015
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	* FS prism pair		* FS prism pair
	* Spare thermistors and TECs		* Spare thermistors and TECs
			* λ/2 waveplate for pump beam

	== Log ==		== Log ==

Karpel at 15:54, 14 August 2015

2015-08-14T15:54:47Z

← Older revision		Revision as of 15:54, 14 August 2015
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	* Build crystal mount (have both parts now)		* Build crystal mount (have both parts now)
	* Do absorption measurements on our Ti:sapph crystal		* Do absorption measurements on our Ti:sapph crystal
			* Figure out positioning of cavity elements/prep for cavity assembly.

	===== Long Term =====		===== Long Term =====