Yavuz Group - User contributions [en]

Possibly Useful Files

2018-11-19T01:18:06Z

Eamueller2:

[https://wiki.physics.wisc.edu/yavuz/images/5/52/LaserSafety_2014-07-16.pdf Laser Safety PowerPoint]
::These are slides from Mark Saffman's July 2014 seminar on laser safety. This could be a good resource for new group members.
::'''''DO NOT DISTRIBUTE THESE PUBLICLY.'''''

[https://wiki.physics.wisc.edu/yavuz/images/d/db/Cowan_code_tutorial.pdf How to use the Cowan code zjs]

[https://wiki.physics.wisc.edu/yavuz/images/2/2f/Eu_Spectroscopy_Analysis.pdf Zach's Analysis of the Pulsed Laser]

[https://wiki.physics.wisc.edu/yavuz/images/b/b4/Final_thesis.pdf J J Weber's Thesis]

[https://wiki.physics.wisc.edu/yavuz/images/4/4c/Josh_Presentations.zip Various Josh Posters/Presentations]

Josh and David's DAMOP 2014 Poster ([https://wiki.physics.wisc.edu/yavuz/images/5/58/DAMOP_2014.pptx PowerPoint], [https://wiki.physics.wisc.edu/yavuz/images/0/0b/DAMOP_2014.pdf PDF])

[https://wiki.physics.wisc.edu/yavuz/images/d/da/Lasermounts_writeup.pdf Eli's laser mount test writeup]

[https://wiki.physics.wisc.edu/yavuz/index.php/File:Rubidium_Raman_Cell_Absorption_Modeling.zip Raman vapor-cell experiment absorption modeling program. Written 2012, posted 8-7-2015.]

Possibly Useful Files

2018-11-19T01:17:41Z

Eamueller2:

File:Wavemeter files.zip

2018-11-19T01:04:46Z

Eamueller2: Contains a writeup for the wavemeter as well as circuit diagrams and code for the microcontroller to count fringes.

Contains a writeup for the wavemeter as well as circuit diagrams and code for the microcontroller to count fringes.

Journal Club

2017-06-22T18:28:09Z

Eamueller2:

'''6/21/17:'''
{| class="wikitable sortable"
|-
! Journal Name !! Article Title !! Description
|-
| Nature Photonics || [http://www.nature.com/nphoton/journal/v11/n5/full/nphoton.2017.58.html Fast silicon photodiodes] || Interesting summary of photodiode technology and limitations. Can response time be increased without sacrificing sensitivity?
|-
| Nature Photonics || [http://www.nature.com/nphoton/journal/v11/n4/full/nphoton.2017.32.html Spatial beam self-cleaning in multimode fibres] || The Kerr effect caused by high intensity beams can result in more light coupling into the fundamental mode of a multi-mode fiber, causing minimal beam speckling at the output.
|-
| Science || [http://science.sciencemag.org/content/356/6340/837 Quantum sensing with arbitrary frequency resolution] || NV centers in diamond are used to detect the frequency of oscillating magnetic fields with submillihertz resolution.
|-
| Physical Review Letters || [https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.118.223605 Self-Similar Nanocavity Design with Ultrasmall Mode Volume for Single-Photon Nonlinearities] || By coupling light into a cavity with an extremely small mode volume, nonlinear optical effects can be observed with very small numbers of photons.
|-
| Physical Review Letters || [https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.118.243201 Ultrafast Magnetization of a Dense Molecular Gas with an Optical Centrifuge] || A new technique allows for magnetization of much denser gases than was previously possible.
|-
| Journal of Computational Physics || [http://www.sciencedirect.com/science/article/pii/S0021999116306301 Constructing non-reflecting boundary conditions using summation-by-parts in time] || An alternate technique for constructing non-reflecting boundaries, supposedly simpler than current techniques such as perfectly-matched layers (PMLs).
|-
| Nature Communications || [https://www.nature.com/articles/ncomms15610 Harnessing speckle for a sub-femtometer resolved broadband wavemeter and laser stabilization] || They demonstrate speckle-pattern based wavemeter with about 1 MHz frequency resolution
|-
| Nature Communications || [https://www.nature.com/articles/ncomms15849?WT.feed_name=subjects_physical-chemistry Observing electron localization in dissociating H2+ molecule in real time] || They use pump-probe technique with CEP stabilized ~5 fs long pulses to probe dissociation dynamics of H2+ in femtosecond time scales
|-
| Journal of the Optical Society of America A || [https://www.osapublishing.org/abstract.cfm?uri=cleo_qels-2017-FTu3D.2&origin=search Raman-assisted broadband Kerr frequency comb generation in AlN-on-sapphire microresonators] || Four wave mixing is used in a AlN film to build a frequency comb spanning 1.2-2.2 um
|-
| Nature Communications || [https://www.nature.com/articles/ncomms1984 Quantifying the magnetic nature of light emission] || Light emitted from Europium ions is decomposed into parts originating from electric dipole transitions and magnetic dipole transitions
|}

Journal Club

2017-06-22T18:20:46Z

Eamueller2:

File:Laser Tuning Circuit.pdf

2016-05-06T20:03:10Z

Eamueller2:

File:VCO integrating circuit.pdf

2016-05-06T20:02:43Z

Eamueller2:

File:VCO integrating circuit.docx

2016-05-06T20:01:29Z

Eamueller2:

File:Laser Tuning Circuit.docx

2016-05-06T19:57:09Z

Eamueller2:

Eli notebook

2015-08-17T20:55:56Z

Eamueller2:

===ECDL Tuning===

'''8/17/15'''
The 1055nm laser does not work well with the ramp set at high ratios so the optimal ratio of 10 mA/V definitely didn't work. I tried a few scans with a ratio of about .07mA/V which is closer to what I used for the 785 laser and it scanned much larger ranges of about 8GHz. Right now the ratios between .12-.17mA/V have produced scans over the whole 0-150V piezo range without mode hops with the laser tuning about 18 GHz. These scans were tried with setpoints of 70,74, 78 mA on the diode driver and all gave similar tuning ranges. The 78 mA setpoint tunes over a a range that is a little offcenter to lower frequencies from the 1055.076nm center (-6-12GHZ). The lower setpoints seems to scan over a different mode and tunes the laser offcenter to higher frequencies from center (-10-8GHz). I think the only way to center the tuning range more is to adjust the horizontal setting of the grating.

'''8/5/15'''

I was able to achieve 20-25GHz tuning range with the 785 nm diode with a ratio of about -.1mA/V. The best scans were with the current at a setpoint between 80-100mA. Through each scan, the current dropped about 15 mA which led to a drop in output power of about 8-9mW. With the 1055nm diode, I got the tuning rates for the piezo to be .14GHz/V. The current tuned extremely slow with about .0134GHz/mA. Using these rates, the ratio for the current and piezo should be 10.45mA/V.

'''7/16/15'''

I tuned the laser by varying the current from 35mA to 120mA and kept the piezo at 2V for one scan and 35V for another. The 2V scan gave a little cleaner data and both gave nearly the same tuning rate of about -1.5 GHz/mA. The rate seemed to increase at higher currents. This tuning rate along with the piezo tuning rate implies that the piezo and current should be tuned with a ratio of about -.107 mA/V which is quite low compared to what I've been reading.

'''7/14/15'''

Tuned a 785nm laser by keeping current fixed at 68.5mA and ramping the grating piezo from 0 to 150V. Got a pretty decent plot of frequency vs piezo voltage with clear mode hops. Decreasing the voltage from 150V to 0V yielded a messier plot with more random mode hops. In all, the laser tunes with a rate of about .16 GHz/V.

To get an idea of how the laser tunes with current I tried eliminating the external cavity by removing the grating but the laser was pretty unstable this way and wouldn't stay single mode even while keeping the current fixed. So I attached the grating and I tried to tune the laser by keeping the piezo at a fixed voltage while varying the current. I'm now trying to find a piezo setting that allows a workable range of single mode while changing the current so I can get get some good data. I'm also unsure if having the external cavity while varying the current changes the tuning rate as opposed to tuning the laser diode without the grating.

Eli notebook

2015-08-05T19:04:21Z

Eamueller2:

===ECDL Tuning===

'''8/5/15'''

I was able to achieve 20-25GHz tuning range with the 785 nm diode with a ratio of about -.1mA/V. The best scans were with the current at a setpoint between 80-100mA. Through each scan, the current dropped about 15 mA which led to a drop in output power of about 8-9mW. With the 1065nm diode, I got the tuning rates for the piezo to be .14GHz/V. The current tuned extremely slow with about .0134GHz/mA. Using these rates, the ratio for the current and piezo should be 10.45mA/V.

'''7/16/15'''

I tuned the laser by varying the current from 35mA to 120mA and kept the piezo at 2V for one scan and 35V for another. The 2V scan gave a little cleaner data and both gave nearly the same tuning rate of about -1.5 GHz/mA. The rate seemed to increase at higher currents. This tuning rate along with the piezo tuning rate implies that the piezo and current should be tuned with a ratio of about -.107 mA/V which is quite low compared to what I've been reading.

'''7/14/15'''

Tuned a 785nm laser by keeping current fixed at 68.5mA and ramping the grating piezo from 0 to 150V. Got a pretty decent plot of frequency vs piezo voltage with clear mode hops. Decreasing the voltage from 150V to 0V yielded a messier plot with more random mode hops. In all, the laser tunes with a rate of about .16 GHz/V.

To get an idea of how the laser tunes with current I tried eliminating the external cavity by removing the grating but the laser was pretty unstable this way and wouldn't stay single mode even while keeping the current fixed. So I attached the grating and I tried to tune the laser by keeping the piezo at a fixed voltage while varying the current. I'm now trying to find a piezo setting that allows a workable range of single mode while changing the current so I can get get some good data. I'm also unsure if having the external cavity while varying the current changes the tuning rate as opposed to tuning the laser diode without the grating.

Eli notebook

2015-07-16T22:58:07Z

Eamueller2: /* ECDL Tuning */

===ECDL Tuning===

'''7/16/15'''

I tuned the laser by varying the current from 35mA to 120mA and kept the piezo at 2V for one scan and 35V for another. The 2V scan gave a little cleaner data and both gave nearly the same tuning rate of about -1.5 GHz/mA. The rate seemed to increase at higher currents. This tuning rate along with the piezo tuning rate implies that the piezo and current should be tuned with a ratio of about -.107 mA/V which is quite low compared to what I've been reading.

'''7/14/15'''

Tuned a 785nm laser by keeping current fixed at 68.5mA and ramping the grating piezo from 0 to 150V. Got a pretty decent plot of frequency vs piezo voltage with clear mode hops. Decreasing the voltage from 150V to 0V yielded a messier plot with more random mode hops. In all, the laser tunes with a rate of about .16 GHz/V.

To get an idea of how the laser tunes with current I tried eliminating the external cavity by removing the grating but the laser was pretty unstable this way and wouldn't stay single mode even while keeping the current fixed. So I attached the grating and I tried to tune the laser by keeping the piezo at a fixed voltage while varying the current. I'm now trying to find a piezo setting that allows a workable range of single mode while changing the current so I can get get some good data. I'm also unsure if having the external cavity while varying the current changes the tuning rate as opposed to tuning the laser diode without the grating.

Eli notebook

2015-07-14T23:00:42Z

Eamueller2:

===ECDL Tuning===

'''7/14/15'''

Tuned a 785nm laser by keeping current fixed at 68.5mA and ramping the grating piezo from 0 to 150V. Got a pretty decent plot of frequency vs piezo voltage with clear mode hops. Decreasing the voltage from 150V to 0V yielded a messier plot with more random mode hops. In all, the laser tunes with a rate of about .16 GHz/V.

To get an idea of how the laser tunes with current I tried eliminating the external cavity by removing the grating but the laser was pretty unstable this way and wouldn't stay single mode even while keeping the current fixed. So I attached the grating and I tried to tune the laser by keeping the piezo at a fixed voltage while varying the current. I'm now trying to find a piezo setting that allows a workable range of single mode while changing the current so I can get get some good data. I'm also unsure if having the external cavity while varying the current changes the tuning rate as opposed to tuning the laser diode without the grating.

Eli notebook

2015-07-14T21:51:08Z

Eamueller2:

Eli notebook

2015-07-14T21:32:12Z

Eamueller2:

===ECDL Tuning===

Eli notebook

2015-07-14T21:18:24Z

Eamueller2: Created page with "hey"

hey

Main Page

2015-07-14T21:18:03Z

Eamueller2:

'''MediaWiki has been successfully installed.'''

Consult the [//meta.wikimedia.org/wiki/Help:Contents User's Guide] for information on using the wiki software.

== Getting started ==
* [//www.mediawiki.org/wiki/Manual:Configuration_settings Configuration settings list]
* [//www.mediawiki.org/wiki/Manual:FAQ MediaWiki FAQ]
* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]

== News/Discussion ==
'''3/29/15''' 31 days ago a logo mysteriously appeared on the wiki. Today, just as mysteriously, it left us. Life continues on.

--[[User:Zjsimmons|Zjsimmons]] ([[User talk:Zjsimmons|talk]]) 20:43, 26 February 2015 (CST)
hey somebody changed logo, good going, how do we do that?

'''9/11/14'''
David added "Possibly Useful Files" to the sidebar. Probably a good place to put posters/write ups you've done so they don't get lost after people graduate.

'''8/29/14'''
Josh added a "Thesis Template" page. It has info on formatting your thesis.

'''8/25/14'''
Josh and Jared and Nick added a page with instructions on how to edit the website. Josh added a section with the copyright policies of many of the journals that we've published in. This has the rules for posting articles on the website. These are both on the [[Website]] page.

Josh also added a link to the site that you use to sign up for the UW AMO e-mail distribution list. It's on the [[Useful External Links]] page.

'''5/22/14'''
Kara showed Zach and me [http://noc.hep.wisc.edu/nrg/ this website] that has temperature and humidity for Saffman's labs. The three bottom links are for Saffman's labs. I think all of their labs but the rubidium lab have air conditioning separate from the building.

'''5/20/14'''
Chad made it possible to use latex syntax in order to write equations, so that's pretty <math>\sigma\omega\epsilon\epsilon\tau^2</math>.

'''5/15/14'''
Log-in now required to view pages. Feel free to post your secret crushes and inner most thoughts.

'''5/13/14'''
Josh did stuff, including adding the new sections (Vendors and External Links) below. Feel free to add, change, or delete them if you have other ideas.

'''5/12/14''' File uploads now accept most file types and up to 20 MB (thanks, Chad!)

To embed PDFs, the easiest way seems to be to use the "upload file" link in the sidebar, then copy the web address of the uploaded file and just insert it as a hyperlink into the page you're editing. Since the file is hosted on the physics server, this should be safer than just linking to off-site pages, which may not indefinitely keep manuals up.

'''5/8/14''' "All Pages" moved to sidebar as "Index"

This is our main page:P

apparently, to add an item to the sidebar, you need to go here:
https://wiki.physics.wisc.edu/yavuz/index.php?title=MediaWiki:Sidebar&action=edit

What all pages do you guys want to have?
* Should we each have some kind of log page?
* Equipment List?
* manuals 
* Internal/informal documents?
* useful matlab programs/programs we don't want to lose?
 
thoughts?

==Research Projects==
[[Localization of Atomic Excitation]]

==People==
[[Josh Weber]]
 
[[Jared]]

==Lab Notebooks / Logs==
[[David Notebook]]
 
[[Jared lab notebook]]
 
[[Josh Notebook]]
 
[[Nick Brewer]]
 
[[Zjs log]]
 
[[JTK Notebook]]
 
[[Eli notebook]]

Possibly Useful Files

2015-05-29T15:03:15Z

Eamueller2:

File:Lasermounts writeup.pdf

2015-05-29T15:01:47Z

Eamueller2: Temperature tests of laser mounts

Temperature tests of laser mounts