Date: Mon Feb 25 13:37:23 2008 Back to Contents

Author: Sam Sampere

Subject: Re: Blue Lasers ?

Post:
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Ok, Chuck, why would you want to buy one? What would you do with the
blue laser?? Does anyone know if it would be bright enough for demos? It
would be cool to have a RGB interference/diffraction pattern kit.

=20

My RG interference (simultaneous) rig is just about finished in the
shop.=20

=20

Sam

=20

________________________________

From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Gerald Zani
Sent: Monday, February 25, 2008 12:10 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Blue Lasers ?

=20

Right. - J

At 11:07 AM 2/25/2008, you wrote:



So buying an obsolete HD DVD player is NOT a good way to obtain a cheap
blue laser pointer?
=20
Sam
=20

________________________________

From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Rick Tarara
Sent: Monday, February 25, 2008 10:55 AM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Blue Lasers ?
=20
I would suspect it is a matter of intensity. In the DVD players you
need an extremely fine beam, but not a whole lot of intensity. For a
pointer, taking into account the eye's lack of response to blue, you
need a lot. =20
=20
Rick

----- Original Message -----=20

From: Sam Sampere =20

To: tap-l@lists.ncsu.edu=20

Sent: Monday, February 25, 2008 10:38 AM

Subject: Re: [tap-l] Blue Lasers ?

=20

If they're about $100, how come we're not seeing blue laser pointers for
$200 yet? I'd buy one if they were that cheap.

=20

Sam

=20

________________________________

From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Rick Tarara

Sent: Monday, February 25, 2008 10:24 AM

To: tap-l@lists.ncsu.edu

Subject: Re: [tap-l] Blue Lasers ?

=20

It is a laser diode based on gallium nitride (according to Wikipedia).
Since Sony blu-ray players are going for $300-400, you can figure the
cost of the laser at around $100. The (now and suddenly defunct--you
could have bet that SONY was not going to lose a second time) HD-DVD
also uses a similar laser diode. =20

=20

Rick (who bought his Blu-Ray player -- with 10 free discs just after
Xmas!)

=20

***************************

Richard W. Tarara

Professor of Physics

Saint Mary's College

Notre Dame, IN

rtarara@saintmarys.edu

******************************

Free Physics Software

PC & Mac

www.saintmarys.edu/~rtarara/software.html

*******************************

----- Original Message -----=20

From: Sam Sampere =20

To: tap-l@lists.ncsu.edu=20

Sent: Monday, February 25, 2008 9:58 AM

Subject: Re: [tap-l] Blue Lasers ?

=20

Ok, what's in and HD DVD player? Is it a blue laser (~$1,000) or a blue
LED?

=20

Sam

=20

________________________________

From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Gerald Zani

Sent: Monday, February 25, 2008 9:21 AM

To: tap-l@lists.ncsu.edu

Subject: Re: [tap-l] Blue Lasers ?

=20

And why not buy the Blue LED itself? -- JZ

At 09:08 AM 2/25/2008, you wrote:

http://www.tigerdirect.com =20

has one for $89.99 after a $60 instant rebate.



On Saturday 23 February 2008, chuck britton wrote:

> Anybody know where to pick some of these (newly) obsolete Toshiba

> HiDef DVD players?

>=20

> I'd sure like to salvage one of the blue lasers.




--=20

Mike Timmins

University of Virginia

email: mat3q@virginia.edu

phone: (434) 924-6800

mail address:

382 McCormick Rd

Charlottesville, VA 22904

Gerald Zani e-mail: Gerald_Zani@brown.edu

Manager of Demonstrations phone: (401) 863-3964

Department of Physics FAX: (401) 863-2024

Brown University Providence, RI 02912-1843 USA

=20

URL
http://www.physics.brown.edu/physics/userpages/staff/Gerald_Zani/index.h
tml

URL http://www.physics.brown.edu/physics/demopages/demo/=20

=20

"Eurika!"

=20


Gerald Zani e-mail: Gerald_Zani@brown.edu
Manager of Demonstrations phone: (401) 863-3964
Department of Physics FAX: (401) 863-2024
Brown University Providence, RI 02912-1843 USA
=20
http://www.physics.brown.edu/physics/demopages/demo/
http://www.physics.brown.edu/physics/userpages/staff/Gerald_Zani/index.h
tml
=20
Do a little more of that work which you have confessed to be good,
Which you feel that society and your most Just Judge rightly demand of
you.
Cultivate the tree which you have found to bear fruit in your soil.
If you have any experiments you would like to try, try them.=20
Now's your chance.

Henry David Thoreau, Journal entry, 1850.


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Ok, Chuck, why would you want to =
buy one? What
would you do with the blue laser?? Does anyone know if it would be =
bright
enough for demos? It would be cool to have a RGB =
interference/diffraction
pattern kit.



My RG interference (simultaneous) =
rig is
just about finished in the shop.



Sam











From: =
tap-l-owner@lists.ncsu.edu
[mailto:tap-l-owner@lists.ncsu.edu] On Behalf
Of Gerald Zani
Sent: Monday, February =
25, 2008
12:10 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Blue =
Lasers ?





Right. - J

At 11:07 AM 2/25/2008, you wrote:



So buying an obsolete HD DVD player =
is NOT
a good way to obtain a cheap blue laser pointer?

Sam








From:
tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On Behalf Of Rick Tarara
Sent: Monday, February =
25, 2008
10:55 AM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Blue =
Lasers ?

I
would suspect it is a matter of intensity. In the DVD players you =
need an
extremely fine beam, but not a whole lot of intensity. For a =
pointer,
taking into account the eye's lack of response to blue, you need a =
lot.

Rick

----- Original Message ----- =


From: Sam =
Sampere


To: tap-l@lists.ncsu.edu


Sent: Monday, February 25, 2008 10:38 =
AM

Subject: Re: [tap-l] Blue Lasers =
?



If they’re =
about
$100, how come we’re not seeing blue laser pointers for $200 yet?
I’d buy one if they were that cheap.

=


Sam

=








From: tap-l-owner@lists.ncsu.edu=
[mailto:tap-l-owner@lists.ncsu.edu]
On Behalf Of Rick Tarara

Sent: Monday, February 25, =
2008
10:24 AM

To: tap-l@lists.ncsu.edu<=
/span>

Subject: Re: [tap-l] Blue =
Lasers ?



It is a laser diode =
based on
gallium nitride (according to Wikipedia). Since Sony blu-ray =
players are
going for $300-400, you can figure the cost of the laser at around =
$100.
The (now and suddenly defunct--you could have bet that SONY was not =
going to
lose a second time) HD-DVD also uses a similar laser diode. =




Rick (who bought his =
Blu-Ray player
-- with 10 free discs just after Xmas!)



***************************<=
o:p>

Richard W. =
Tarara

Professor of =
Physics

Saint Mary's =
College

Notre Dame, =
IN

rtarara@saintmarys.edu

****************************=
**

Free Physics =
Software

PC & =
Mac

www.saintmarys.=
edu/~rtarara/software.html

****************************=
***

----- Original Message =
-----

From: Sam Sampere =


To: tap-l@lists.ncsu.edu =


Sent: Monday, February 25, =
2008 9:58
AM

Subject: Re: [tap-l] Blue =
Lasers ?



Ok, what’s =
in and
HD DVD player? Is it a blue laser (~$1,000) or a blue =
LED?

=


Sam

=








From: tap-l-owner@lists.ncsu.edu=
[mailto:tap-l-owner@lists.ncsu.edu]
On Behalf Of Gerald Zani

Sent: Monday, February 25, =
2008
9:21 AM

To: tap-l@lists.ncsu.edu<=
/span>

Subject: Re: [tap-l] Blue =
Lasers ?



And why not buy the Blue LED itself? -- =
JZ

At 09:08 AM 2/25/2008, you =
wrote:

http://www.tigerdirect.com<=
/p>

has one for $89.99 after a $60 instant =
rebate.



On Saturday 23 February 2008, chuck britton =
wrote:

> Anybody know where to pick some of these =
(newly)
obsolete Toshiba

> HiDef DVD =
players?

>

> I'd sure like to salvage one of the blue =
lasers.




--

Mike Timmins

University
of Virginia

email: mat3q@virgini=
a.edu

phone: (434) =
924-6800

mail address:

382
McCormick Rd

Charlottesville,
VA 22904

Gerald =
Zani =
; &nb=
sp; e-mail:
Gerald_Zani@brown.edu

Manager of =
Demonstrations ph=
one:
(401) 863-3964

Department of =
Physics &n=
bsp; FAX:
(401) 863-2024

Brown
University &nbs=
p;
Providence, RI 02912-1843 USA



URL http://www.physics.brown.edu/physics/userpages/staff/Ger=
ald_Zani/index.html

URL http://www.physics.brown.edu/physics/demopages/demo/=





"Eurika!"








Gerald =
Zani =
; &nb=
sp; e-mail: Gerald_Zani@brown.edu
Manager of =
Demonstrations ph=
one: (401) 863-3964
Department of =
Physics &n=
bsp; FAX: (401) 863-2024
Brown =
University =
Providence=
, RI 02912-1843 USA

http://www.physics.brown.edu/physics/demopages/demo/=

http://www.physics.brown.edu/physics/userpages/staff/Ger=
ald_Zani/index.html

Do a little more of that work which you have confessed to be =
good,
Which you feel that society and your most Just Judge rightly demand =
of you.
Cultivate the tree which you have found to bear fruit in your =
soil.
If you have any experiments you would like to try, try them.
Now's your chance.

Henry David Thoreau, Journal entry, 1850.



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From tap-l-owner@lists.ncsu.edu Mon Feb 25 13:37:23 2008

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