User:Pranav Rathi/Notebook/OT/2010/08/02/x & y Signal Drift Issue - Revision history

Pranav Rathi at 20:35, 15 November 2012

Pranav Rathi — Thu, 15 Nov 2012 20:35:30 GMT

←Older revision		Revision as of 20:35, 15 November 2012
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-	[[Category:Optical ~~Tweezer~~]]	+	[[Category:Construction of Optical Tweezers and devices]]

Pranav Rathi at 21:38, 25 August 2010

Pranav Rathi — Wed, 25 Aug 2010 21:38:18 GMT

←Older revision		Revision as of 21:38, 25 August 2010
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	===Goal===		===Goal===
		+	The goal has been achieved today. The drift problem is solved by imaging the beam waist (1.26mm; exists inside the AOM) with 1:1 telescope on the QPD. I am very positive that this works, but I am still verifying that it is not happening due to small beam waist at the QPD. I will right the full detail later ; how we achieved it.
	Investigate the x & Y signal drift: What is causing it; AOM or the laser (most probable it’s the AOM), magnitude of the effect, and possible solution.		Investigate the x & Y signal drift: What is causing it; AOM or the laser (most probable it’s the AOM), magnitude of the effect, and possible solution.

Pranav Rathi: /* Setup & procedure */

Pranav Rathi — Mon, 02 Aug 2010 21:23:59 GMT

Setup & procedure

←Older revision		Revision as of 21:23, 2 August 2010
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	===Setup & procedure===		===Setup & procedure===
		+	The setup is fairly simple; laser --> AOM --> two mirrors (down and upstream) --> telescope (1:1)--> QPD.
		+
	====Procedure====		====Procedure====
	under work		under work

Pranav Rathi: /* Steps */

Pranav Rathi — Mon, 02 Aug 2010 21:23:05 GMT

Steps

←Older revision		Revision as of 21:23, 2 August 2010
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	under work		under work
	====Steps====		====Steps====
-	~~The setup is fairly simple; laser --> AOM --> two mirrors (down and upstream) --> telescope (1:1)--> QPD.~~
	# Measure the beam waist (2 x W=1.5) at the eyepiece lens of the telescope.		# Measure the beam waist (2 x W=1.5) at the eyepiece lens of the telescope.
	# Setup the (1:1) telescope: In this case two planoconvex lenses (f=38.1mm of both) are used.		# Setup the (1:1) telescope: In this case two planoconvex lenses (f=38.1mm of both) are used.

Pranav Rathi at 21:10, 2 August 2010

Pranav Rathi — Mon, 02 Aug 2010 21:10:59 GMT

←Older revision		Revision as of 21:10, 2 August 2010
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-	~~under work~~	+	===Goal===
		+	Investigate the x & Y signal drift: What is causing it; AOM or the laser (most probable it’s the AOM), magnitude of the effect, and possible solution.

	===Setup & procedure===		===Setup & procedure===
		+	====Procedure====
		+	under work
	====Steps====		====Steps====
		+	The setup is fairly simple; laser --> AOM --> two mirrors (down and upstream) --> telescope (1:1)--> QPD.
	# Measure the beam waist (2 x W=1.5) at the eyepiece lens of the telescope.		# Measure the beam waist (2 x W=1.5) at the eyepiece lens of the telescope.
	# Setup the (1:1) telescope: In this case two planoconvex lenses (f=38.1mm of both) are used.		# Setup the (1:1) telescope: In this case two planoconvex lenses (f=38.1mm of both) are used.

Pranav Rathi: /* Steps */

Pranav Rathi — Mon, 02 Aug 2010 21:00:23 GMT

Steps

←Older revision		Revision as of 21:00, 2 August 2010
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	# Measure the beam waist again (2 x W =1.5) at QPD, to make sure that the ratio is 1:1.		# Measure the beam waist again (2 x W =1.5) at QPD, to make sure that the ratio is 1:1.
	# Straighten the beam after the telescope, using two aperture techniques [[http://openwetware.org/wiki/User:Pranav_Rathi/Notebook/OT/2010/04/20/Super_easy_way_to_straighten_and_align_two_laser_beams_simultaneously]].		# Straighten the beam after the telescope, using two aperture techniques [[http://openwetware.org/wiki/User:Pranav_Rathi/Notebook/OT/2010/04/20/Super_easy_way_to_straighten_and_align_two_laser_beams_simultaneously]].
-	# Setup the QPD in the xyz translation stage.	+	# Setup the QPD on the xyz translation stage.



	[[Category:Optical Tweezer]]		[[Category:Optical Tweezer]]

Pranav Rathi at 20:59, 2 August 2010

Pranav Rathi — Mon, 02 Aug 2010 20:59:37 GMT

←Older revision		Revision as of 20:59, 2 August 2010
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		+	under work
		+
	===Setup & procedure===		===Setup & procedure===
	====Steps====		====Steps====

Pranav Rathi: /* Steps */

Pranav Rathi — Mon, 02 Aug 2010 20:58:55 GMT

Steps

←Older revision		Revision as of 20:58, 2 August 2010
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	# Setup the (1:1) telescope: In this case two planoconvex lenses (f=38.1mm of both) are used.		# Setup the (1:1) telescope: In this case two planoconvex lenses (f=38.1mm of both) are used.
	# Measure the beam waist again (2 x W =1.5) at QPD, to make sure that the ratio is 1:1.		# Measure the beam waist again (2 x W =1.5) at QPD, to make sure that the ratio is 1:1.
-	# Straighten the beam after the telescope, using two aperture techniques.	+	# Straighten the beam after the telescope, using two aperture techniques [[http://openwetware.org/wiki/User:Pranav_Rathi/Notebook/OT/2010/04/20/Super_easy_way_to_straighten_and_align_two_laser_beams_simultaneously]].
	# Setup the QPD in the xyz translation stage.		# Setup the QPD in the xyz translation stage.

Pranav Rathi: New page: ===Setup & procedure=== ====Steps==== # Measure the beam waist (2 x W=1.5) at the eyepiece lens of the telescope. # Setup the (1:1) telescope: In this case two planoconvex lenses (f=38.1mm...

Pranav Rathi — Mon, 02 Aug 2010 20:52:55 GMT

New page: ===Setup & procedure=== ====Steps==== # Measure the beam waist (2 x W=1.5) at the eyepiece lens of the telescope. # Setup the (1:1) telescope: In this case two planoconvex lenses (f=38.1mm...

New page

===Setup & procedure===
====Steps====
# Measure the beam waist (2 x W=1.5) at the eyepiece lens of the telescope.
# Setup the (1:1) telescope: In this case two planoconvex lenses (f=38.1mm of both) are used.
# Measure the beam waist again (2 x W =1.5) at QPD, to make sure that the ratio is 1:1.
# Straighten the beam after the telescope, using two aperture techniques.
# Setup the QPD in the xyz translation stage.

[[Category:Optical Tweezer]]