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Topics - Alfa Romeo

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1
Lasers / Proper way to setup a 532nm DPSS for Analog Modulation
« on: November 24, 2009, 01:48:47 pm »
I am building a .5w 532nm DPSS from the setup attached. my question is, to get descent analog modulation from a dpss what should the ONE PIECE ND:YVO4+KTP CRYSTAL temp be set at. with seperate crystals, the ND:YVO4 should be cooled and the KTP should be heated i think. but with a one piece unit, is there a 'rule of thumb'. any comments appreciated.

assuming double TEC, 1 for the IR diode,  1 for ND:YVO4+KTP CRYSTAL.

tia
Pat


specs from seller:

LASER CRYSTAL, LASER DIODE, CAVITY AND LENS OPTICAL ASSEMBLY

 

    * COMES WITH A NEW THOR-LABS 300mW T0-18 808nm C/W LASER DIODE.
    * COMES WITH A ONE PIECE ND:YVO4+KTP CRYSTAL
    * COMES WITH ALL THE AR COATED GLASS OPTICS NEEDED.
    * WILL HANDLE UP TO 2 WATTS OF 808nm PUMP POWER. FIT A 1 WATT DIODE AND YOU WILL HAVE SOME SERIOUS GREEN POWER FROM IT BECAUSE OF THE TWO SET GRIN LENS ASSEMBLY THIS UNIT HAS AN EXTREMELY HIGH CONVERSION RATE FROM 808nm TO 1064nm TO 532nm.
    * THESE UNITS ARE EASILY CAPABLE OF PRODUCING 600mW OF 532nm GREEN, I HAVE DONE IT! I PRODUCED 624mW AT 532nm C/W AT A VERY PRECISION LOW DIVERGANCE ROUND BEAM.
    * COMES WITH ALL HIGH QUALITY GLASS AR 808nm AND 532nm COATED GRIN LENSES AND 532nM COLLIMATING LENS AND ALSO A FINAL FOCUS LENS.
    * THIS IS A ALL THREADED ASSEMBLY. NO CHEAP PRESSED TOGETHER, PRESS FIT LOW QUALITY PARTS HERE.
    * EVERYTHING IS ADJUSTABLE, DIODE ROTATION, DIODE DISTANCE TO GRIN LENS- GRIN LENES ARE ADJUSTABLE IN DISTANCE TO AND FROM THE CRYSTAL AND TO AND FROM THE LASER DIODE ITS SELF AND ALSO IN ROTATION, THE COLLIMATING LENS IS ADJUSTABLE IN DISTANCE FROM THE CRYSTAL AND IN ROTATION WHICH IS WHAT IS REQUIRED TO ACHIEVE MAX OUTPUT POWER.
    * THE ROUND OUTSIDE DIAMETER MAKES IT EASY TO MOUNT INTO A TEC COOLED HEATSINK BLOCK, JUST DRILL A HOLE IN A PIECE OF ALUMINIUM AND TEC COOL IT OR FAN COOL IT AND YOU ARE DONE, ALL THE HARD WORK HAS BEEN DONE ALREADY,
    * PERFECT FOR LASER BUILDERS OR HOBBYISTS, EXTREMELY SIMPLE ASSY.
    * SIMPLE, 808nm IN AND 532nm OUT.
[/size]

2
Construction / Review of Brass Housing with 405-G-1 Lens from Laser66.com
« on: November 07, 2009, 02:08:44 pm »
First off I'd like to say 'Watsup' to all of you! and thanks for all the Awesome brain food!

This post is my opinion, experience and thoughts. No offense is intended. Your mileage may vary!

I've been building my first RGB scanner since about Feb 2009.
My goal is to be fully CDRH compliant and certify it with FDA. (WOW what a reality check there!!) More on the Build, etc later in another post.

So here i am with 3 lasers, with very different beam profiles, sent to Scanpro20's 6mm x 11mm mirrors. 6mm input mirror at 45 degrees = effectively 3mm tall mirror

Green 532 Labby
 50mw 418ma 2mm beam, nice beam profile. divergence looks great.

Red 650 LPC-815 sled extract in Aixis housing with Aixis glass lens.
 435ma 5mm beam, way to big for scanner mirrors. would like it to match the Green beam. divergence issues.

Blue 405 SF-AW210 sled extract in Aixis housing with LSP-BluRay GLASS Lens.
 225ma 6mm beam. Way to big for scanner mirrors. would like it to match the Green beam. divergence issues.

I want the beams to look similar in diameters (3mm or less) and divergence for close and far projections!

While running the forums for brain food, Jayrob has this 405-G-1 in an Aixiz lens barrel for red/bluray with good reviews. I wanted to try this lens, but the Aixiz housing/lens thread issues was just downright sloppy. (Teflon tape , springs, grommet and o-rings coupled with focusing issues, this module was a bummer.)

Another choice is a new brass hi tolerance thread lens nut with 405-G-1 installed. I thought I would  get the lens only and put it in a lens housing myself.

EBay's LASERS4U, best price 25.00 for a lens, WAIT!,  whats this, the lens and complete new style housing designed for the 405-G-1 lens, no wobble, built in O-ring to seal the laser, brass, shorter, knurled nut and the 405-G-1 lens installed, for 40 bucks!! That's less than a modified lens nut! I have never seen this before. Its 10.5mm diam, while my heat sinks are drilled for 12mm housing. bummer, i'll deal with this (bushing, new heat sink) issue later.

I ordered 1 housing with lens for 40 bucks, (later bought lens only and empty housing for 34.00 on auction) free shipping. Shipped from Walnut Creek, Ca. to Tacoma, WA. took only 3 days! Packaged properly. I was ready to switch housings. Pulled the diode from the old housing, removed the new lens Assy (this felt real nice and tight), and pressed the diode into the recessed seat on the new housing, making sure it was all the way in.

With a little work, the Aixis tail housing is/was pressed on the new brass housing then slid back into the 12mm heat sink, locked down and reinstalled on the mounting plate. Later removed to setup new heat sink at 2 x 10.5mm for dual diode (red/bluray) + TEC's phase of project.

After setting up the red and focusing this module i could tell right away that the back focal length required a very precise point at which the focus was achieved!

OMG, this setup is SMOKING!! Red beam diameter is 2.6mm at module exit!! divergence at 20 feet, was the same as my green module!! bluray setup 2.8mm at exit also matched green at 20 feet! See pics for all 3 dots/lines at 20 feet, see for yourself!!

The project took several advances from here, like Setting up the TEC layout with dual reds and dual blues, but for now i will summarize this review.

I am sold on these, I will use these modules/lens for my project
Will at Laser66.com was great to work with. Thanks Will!

My conclusions:

PRO's
1. Awesome beam profile
2. Nice workmanship, machining, / feel
3. Diode sealed with O-ring
4. Perfect for dual diode setup, nice and small housing
5. Awesome price

 
Con's
1. Any wobble would screw up the focus, I mean ANY wobble! There was a small amount for which I needed to add 3 O-rings for red (2 on blue) on shoulder behind focusing ring to totally eliminate the small wobble. I do not think this is a major issue, but it was issue that needed to be dealt with and shared with you.

I will attach photos in another post.

Later, from the quiet guy in the back row!

Pat Allen
Tacoma Washington




3
Hi everyone!

Just thought I would pass along my findings/fixes on this C-MEDIA USB DAC annoyances..

Problems:
I has serious beam left on issues that flat out pissed me off!! contacted hyena and drlava, we tried a couple things, still not fixed.

When I hot plugged in the usb dac, the dam thing wuld not go back to the settings i had (8CH) before i unplugged it. It initialized at 2ch mode!! which meant the remaining uninitialized outputs were at +5v not zero. Beams on when you hot plugged!!

While looking into this, I also discovered how to eliminate the redirected output on ch 7 and 8.

BOTTOM LINE ---- C-Media Driver and settings!!

Here is my fix, please double check/comment on this....

1. Beam left on issues:
Fixed with a simple driver change. use Audio Driver Version v5.12.08.1803 (Lib v76.2)
not a single beam left on issue, for version driver.

2. Hot Plugging:
Tell the driver its only an 8 channel version!!!! dump 2,4,6,Head Phone channels in the cm106.ini file during install. Then when the DAC initializes it only has one choice, 8CH!!

3. Redirected Output on Channels 7,8:
Turn it off in cm106.ini file during install


Details:

here is my contents of the file cm106.ini (you must create this file) located in the install folder:
\XP\Driver\INI\cm106.ini

:START
; Copyright 1999-2007, C-Media Inc.
; C-MEDIA USB Audio Device.

[VERSION]
CMEDIA=120

[CMEDIA]
PCI\VEN_0D8C&DEV_0006&SUBSYS_00000000 = WDM_CMUDAUDEF
PCI\VEN_0D8C&DEV_0102&SUBSYS_00000000 = WDM_CMUDAUDEF
PCI\VEN_1B80&DEV_D715&SUBSYS_00000000 = WDM_CMUDAUDEF
PCI\VEN_152A&DEV_8040&SUBSYS_00000000 = WDM_CMUDAUDEF
PCI\VEN_0D7D&DEV_AC01&SUBSYS_00000000 = WDM_CMUDAUDEF

[WDM_CMUDAUDEF]
DisableSpdifOut       =0x00000001
DisableSpdifIn        =0x00000001
DisableLineIn         =0x00000001
DisableRecord         =0x00000001
KaraokeSupport        =0x00000000
MagicVoiceSupport     =0x00000000
DisableCommSpk        =0x3F
DisableXearSpk        =0x3F
SpeakerConfig         =0x00000007

[OtherSetting]
EnableXear3D          =0x00000000
HideBassEnhance       =0x00000001
SendSurroundToBackIn6ChannelMode = 0x00000000
;END FILE



Some more detailed info:

Setting 0x3F will show only 1 choice, 8CH. 0x37 shows 6 and 8 channel choices
Setting 0x00000007 will set mode to 8CH. setting to 0x00000006 sets mode to 6CH.
DisableCommSpk        =0x3F
DisableXearSpk        =0x3F
SpeakerConfig         =0x00000007

Setting the output redirect to 0, should shutdown the ch7,8 issue. need this checked to see if it does what it says! or is it a 6CH not 8CH issue.
SendSurroundToBackIn6ChannelMode = 0x00000000

Other settings i just put in there to shut down some unused features.
FYI do a search for cm106.ini on the web for more detailed info


Basic procedure:

1. unplug usb DAC
2. uninstall software from add/remove software in control panel
3. reboot
4. plug in usb dac
5. install new driver after you add the cm106.ini file you created from above example, to the \XP\Driver\INI folder
6. reboot
7. check that settings are OK in the audio control panel
8. that's it.


Reference posts:     

USB DAC WARNING !!! 
(hot Plugging)   
http://akrobiz.com/laserboy/forum/index.php/topic,105.0.html

8 channel DAC MUST READ !!! 
(output on channels 7,8 and it might leave some of the colors on) 
http://akrobiz.com/laserboy/forum/index.php/topic,115.0.html

Additional info:

Note this, that Driver version v6.xx does not exist!! why would they label it as such!! v6.xx is really v5.xx after checking cm106.sys files.

Do not believe the cm106.inf file for version number, check cm106.sys. But finally check audio control panel!!

CM106 v6.12.8.2111 (v5.12.8.2111) is the problem drivers version

CM106_L_v5.12.08.0628 is actually v5.12.08.1803, This is the one we want!!!

The cm106.ini has many more settings available. IE: output level settings

Out of box this cm106.ini file for xp driver does not exist in the \XP\Driver\INI folder.



I am sure there is more/corrections to add to this. Pls feel free..
hope this helps someone (by letting their hair grow back!)
comments?

Pat Allen




4
Animation of all the lasers!




5
And Now For Something Completely Different! / The Evolution of one Laserist
« on: February 21, 2009, 09:21:06 am »
First off, I like to say thanks to James for his outstanding creativity and motivation.

My name is Pat Allen, from Tacoma, Washington USA. I am going to share with you all, my progression in this field, from start to current day. I am new to this forum, but in no way new to the field.

The first time I bounced a light off a mirror to see the effects, was back in 1980. I used a spot light through a pinhole onto a mirror suspended from a 12" woofer, with rubber bands, modulated by audio. nice effect for what it was. little did i realize where that would lead. no picture, use your imagination!

Next time was much later, In 1993, after my brother (bass player), introduced me to the band, Mid Life Crisis, I became the Audio-Visual guy. I put together an x-y scanner using two 4" speakers. It was modulated by audio, using a red laser module. This was useful for projecting the bands audio into a x-y beam on a screen above the drummer. It was way cool and a big hit. This setup stayed with me until several years ago. No pictures available.

Within the last 2 -3 years:

Then the hard drive scanner with torsion rods, better than the speaker scanner, but still missing detailed control.

Then the galvo scanner, hand wound, machined neomag rotor, centering supplied by external magnet. No position feedback. This was the major problem with it. Nice results using x-y wav data through a modified sound card into a decoupled car stereo amp (to allow 1hz response). Still no graphics display, bummer. The lack of pos feedback and proper amp was realized. Too much time would be involved to create the requirements, thus the purchase of components to assemble what I envisioned I wanted:

usb sound card 8 channel
Compensation amp 8 channel
scanpro 20k scanners and amp
Red 100mw laser
Green 50mw laser

I am currently waiting for the 8 channel compensation amp to be released and the parts (above) to come. I’m really excited to see the results of descent hardware using Laserboy software!!

Later
Pat


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