User:Pranav Rathi/Notebook/OT/2010/03/23 - Revision history

Pranav Rathi at 19:58, 15 November 2012

2012-11-15T19:58:15Z

←Older revision		Revision as of 19:58, 15 November 2012
Line 1:		Line 1:
-

	==OT alignment==		==OT alignment==
Line 22:		Line 21:


-	[[Category:Optical ~~Tweezer~~]]	+	[[Category:Optical tweezers Notes Archive]]

Pranav Rathi: /* Beam Collimation */

2010-05-05T21:43:56Z

Beam Collimation

←Older revision		Revision as of 21:43, 5 May 2010
Line 22:		Line 22:


-	[[Category:~~Gernal Notes~~]]	+	[[Category:Optical Tweezer]]

Pranav Rathi at 21:43, 5 May 2010

2010-05-05T21:43:22Z

←Older revision		Revision as of 21:43, 5 May 2010
Line 1:		Line 1:
-	~~{\|{{table}} width="800"~~	+
-	\|-	+
-	~~\|style="background-color: #EEE"\|[[Image:owwnotebook_icon.png\|128px]]<span style="font-size:22px;"> Project name</span>~~	+
-	\|style="background-color: #F2F2F2" align="center"\|<html><img src="/images/9/94/Report.png" border="0" /></html> [[{{#sub:{{FULLPAGENAME}}\|0\|-11}}\|Main project page]]<br />{{#if:{{#lnpreventry:{{FULLPAGENAME}}}}\|<html><img src="/images/c/c3/Resultset_previous.png" border="0" /></html>[[{{#lnpreventry:{{FULLPAGENAME}}}}{{!}}Previous entry]]<html>      </html>}}{{#if:{{#lnnextentry:{{FULLPAGENAME}}}}\|[[{{#lnnextentry:{{FULLPAGENAME}}}}{{!}}Next entry]]<html><img src="/images/5/5c/Resultset_next.png" border="0" /></html>}}	+
-	\|-	+
-	~~\| colspan="2"\|~~	+
-	~~<!-- ##### DO NOT edit above this line unless you know what you are doing. ##### -->~~	+
	==OT alignment==		==OT alignment==
	* Collimating the beam		* Collimating the beam

Pranav Rathi: /* Beam Collimation */

2010-03-23T23:38:09Z

Beam Collimation

←Older revision		Revision as of 23:38, 23 March 2010
Line 13:		Line 13:
	== Beam Collimation ==		== Beam Collimation ==
	Method:I used our regular CCD camera with 3+2 O.D. filters + 25mm lance at .10W. First I diverted the beam at 90 degrees with two mirrors after the telescope, and then I placed the camera on the rail in near far-field. I captured the image and move the camera about 60cms (far field) and captured the image again. I compared the spot size in the two images with the help of image-j. In far-field beam looks smaller so I made its size equal (increase) to near-field, through the center dial of the telescope. I came back in near field and check the size again, this time it was bigger, so made it equal (decrease) to far-field by using the eye-piece of the telescope. I followed the process iteratively until the beam sizes match in far and near-field. The results are presented below.		Method:I used our regular CCD camera with 3+2 O.D. filters + 25mm lance at .10W. First I diverted the beam at 90 degrees with two mirrors after the telescope, and then I placed the camera on the rail in near far-field. I captured the image and move the camera about 60cms (far field) and captured the image again. I compared the spot size in the two images with the help of image-j. In far-field beam looks smaller so I made its size equal (increase) to near-field, through the center dial of the telescope. I came back in near field and check the size again, this time it was bigger, so made it equal (decrease) to far-field by using the eye-piece of the telescope. I followed the process iteratively until the beam sizes match in far and near-field. The results are presented below.
		+	Measurement of size; Once the beam is collimated I used the camera in the background with an aperture infront. I adjusted the aperture such its center coincides with the beam axis. In this scenario; when the aperture is closed its overlap the beam periphery from all sides as seen through the camera. Once the aperture inner-circle touches the beam periphery, I stop and measured the circle size, our spot size at .10 W. This is not a very accurate way to measure the spot size, because CCD was somewhat saturating at this power, so spot size might be less. I verified this by projecting the beam at a surface though an aperture and observe it through a cell-phone camera; I closed the aperture until it hits the beam periphery. It came-out to be little less 5mm. I still need a better idea on this one.

	----		----
Line 19:		Line 20:
	[[Image:Colimnear1at .10W.jpg\|thumb\|left\|Beam in near-field at .10W; 6mm diameter]]		[[Image:Colimnear1at .10W.jpg\|thumb\|left\|Beam in near-field at .10W; 6mm diameter]]
	[[Image:Colimfar1at .10W.jpg\|thumb\|left\|Beam in far-field at .10W; 6mm diameter]]		[[Image:Colimfar1at .10W.jpg\|thumb\|left\|Beam in far-field at .10W; 6mm diameter]]
-	[[Image:Colimfar1at .10W both.JPG\|left\|Comparison between near & far-field at .10W; 6mm diameter]]	+	[[Image:Colimfar1at .10W both.JPG\|thumb\|left\|Comparison between near & far-field at .10W; 6mm diameter]]
		+	The two spot sizes are compared, the far field looks little smaller but they agree pretty well in the course of few pixels.
		+	Next Task is to align the periscope on thursday.

Pranav Rathi: /* Beam Collimation */

2010-03-23T22:59:29Z

Beam Collimation

←Older revision		Revision as of 22:59, 23 March 2010
Line 13:		Line 13:
	== Beam Collimation ==		== Beam Collimation ==
	Method:I used our regular CCD camera with 3+2 O.D. filters + 25mm lance at .10W. First I diverted the beam at 90 degrees with two mirrors after the telescope, and then I placed the camera on the rail in near far-field. I captured the image and move the camera about 60cms (far field) and captured the image again. I compared the spot size in the two images with the help of image-j. In far-field beam looks smaller so I made its size equal (increase) to near-field, through the center dial of the telescope. I came back in near field and check the size again, this time it was bigger, so made it equal (decrease) to far-field by using the eye-piece of the telescope. I followed the process iteratively until the beam sizes match in far and near-field. The results are presented below.		Method:I used our regular CCD camera with 3+2 O.D. filters + 25mm lance at .10W. First I diverted the beam at 90 degrees with two mirrors after the telescope, and then I placed the camera on the rail in near far-field. I captured the image and move the camera about 60cms (far field) and captured the image again. I compared the spot size in the two images with the help of image-j. In far-field beam looks smaller so I made its size equal (increase) to near-field, through the center dial of the telescope. I came back in near field and check the size again, this time it was bigger, so made it equal (decrease) to far-field by using the eye-piece of the telescope. I followed the process iteratively until the beam sizes match in far and near-field. The results are presented below.
		+
		+	----
		+	Results:

	[[Image:Colimnear1at .10W.jpg\|thumb\|left\|Beam in near-field at .10W; 6mm diameter]]		[[Image:Colimnear1at .10W.jpg\|thumb\|left\|Beam in near-field at .10W; 6mm diameter]]
		+	[[Image:Colimfar1at .10W.jpg\|thumb\|left\|Beam in far-field at .10W; 6mm diameter]]
		+	[[Image:Colimfar1at .10W both.JPG\|left\|Comparison between near & far-field at .10W; 6mm diameter]]

Pranav Rathi: /* OT alignment */

2010-03-23T22:54:35Z

OT alignment

←Older revision		Revision as of 22:54, 23 March 2010
Line 8:		Line 8:
	==OT alignment==		==OT alignment==
	* Collimating the beam		* Collimating the beam
		+
		+	----
		+
		+	== Beam Collimation ==
		+	Method:I used our regular CCD camera with 3+2 O.D. filters + 25mm lance at .10W. First I diverted the beam at 90 degrees with two mirrors after the telescope, and then I placed the camera on the rail in near far-field. I captured the image and move the camera about 60cms (far field) and captured the image again. I compared the spot size in the two images with the help of image-j. In far-field beam looks smaller so I made its size equal (increase) to near-field, through the center dial of the telescope. I came back in near field and check the size again, this time it was bigger, so made it equal (decrease) to far-field by using the eye-piece of the telescope. I followed the process iteratively until the beam sizes match in far and near-field. The results are presented below.
		+
		+	[[Image:Colimnear1at .10W.jpg\|thumb\|left\|Beam in near-field at .10W; 6mm diameter]]

Pranav Rathi: /* Entry title */

2010-03-23T20:31:28Z

Entry title

←Older revision		Revision as of 20:31, 23 March 2010
Line 6:		Line 6:
	\| colspan="2"\|		\| colspan="2"\|
	<!-- ##### DO NOT edit above this line unless you know what you are doing. ##### -->		<!-- ##### DO NOT edit above this line unless you know what you are doing. ##### -->
-	==~~Entry title~~==	+	==OT alignment==
-	* ~~OptoBio~~	+	* Collimating the beam


-	~~<!-- ##### DO NOT edit below this line unless you know what you are doing. ##### -->~~
-	\|}

-	~~__NOTOC__~~	+
		+	[[Category:Gernal Notes]]

Pranav Rathi: Autocreate 2010/03/23 Entry for User:Pranav_Rathi/Notebook/OT

2010-03-23T20:29:01Z

Autocreate 2010/03/23 Entry for User:Pranav_Rathi/Notebook/OT

New page

{|{{table}} width="800"
|-
|style="background-color: #EEE"|[[Image:owwnotebook_icon.png|128px]]<span style="font-size:22px;"> Project name</span>
|style="background-color: #F2F2F2" align="center"|<html><img src="/images/9/94/Report.png" border="0" /></html> [[{{#sub:{{FULLPAGENAME}}|0|-11}}|Main project page]]<br />{{#if:{{#lnpreventry:{{FULLPAGENAME}}}}|<html><img src="/images/c/c3/Resultset_previous.png" border="0" /></html>[[{{#lnpreventry:{{FULLPAGENAME}}}}{{!}}Previous entry]]<html>      </html>}}{{#if:{{#lnnextentry:{{FULLPAGENAME}}}}|[[{{#lnnextentry:{{FULLPAGENAME}}}}{{!}}Next entry]]<html><img src="/images/5/5c/Resultset_next.png" border="0" /></html>}}
|-
| colspan="2"|

==Entry title==
* OptoBio


|}

__NOTOC__