User:Pranav Rathi/Notebook/OT/2010/05/12/Characterization of AOM module - Revision history

Pranav Rathi: /* Result: */

2013-02-09T19:56:49Z

Result:

←Older revision		Revision as of 19:56, 9 February 2013
Line 19:		Line 19:
	[[User:Pranav_Rathi/Notebook/OT/2010/04/13/Mode_profiling_at_high_power]]		[[User:Pranav_Rathi/Notebook/OT/2010/04/13/Mode_profiling_at_high_power]]

-	Later on we replaced this laser with 1064nm 2W crysta laser which ~~did~~ not have any of the problems.	+	Later on we replaced this laser with 1064nm 2W crysta laser which does not have any of the problems.

	[[User:Pranav_Rathi/Notebook/OT/2010/08/18/CrystaLaser_specifications]]''		[[User:Pranav_Rathi/Notebook/OT/2010/08/18/CrystaLaser_specifications]]''

Pranav Rathi: /* Result: */

2013-02-09T19:55:13Z

Result:

←Older revision		Revision as of 19:55, 9 February 2013
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	'''''The relationship is linear. AOM gives an average output power of 70% in 1st order diffraction beam .''''' This help us calculating the usable power of any input power without measurement; for example if I set the laser on .10W, then the usable power at the tweezers is 70% of it, which is .07W or 70mW. The maximum usable power for the tweezers is 2.66W. If we want to stay in the single mode operation regime, it is 1.4W (at room temperature). When the laser is cooled down to 60F, it is stretched to 1.9W (2.75W input).		'''''The relationship is linear. AOM gives an average output power of 70% in 1st order diffraction beam .''''' This help us calculating the usable power of any input power without measurement; for example if I set the laser on .10W, then the usable power at the tweezers is 70% of it, which is .07W or 70mW. The maximum usable power for the tweezers is 2.66W. If we want to stay in the single mode operation regime, it is 1.4W (at room temperature). When the laser is cooled down to 60F, it is stretched to 1.9W (2.75W input).

-	''Note: This study was done with ~~10634nm~~ 4W coherent compass laser. My study showed that this particular laser trips to higher transverse modes at the power above 1.7W.	+	''Note: This study was done with 1064nm 4W coherent compass laser. My study showed that this particular laser trips to higher transverse modes at the power above 1.7W.

	[[User:Pranav_Rathi/Notebook/OT/2010/04/13/Mode_profiling_at_high_power]]		[[User:Pranav_Rathi/Notebook/OT/2010/04/13/Mode_profiling_at_high_power]]

Pranav Rathi: /* Normal mode operation characterization */

2012-11-15T17:59:26Z

Normal mode operation characterization

←Older revision		Revision as of 17:59, 15 November 2012
Line 24:		Line 24:

	===Normal mode operation characterization===		===Normal mode operation characterization===
-	In normal mode, AOM is controlled through NI-DAQ by LabView program. Voltage input for RF ~~signal~~ is from 1 Volt to 5 Volts in any Volt increment. 1st order ~~diffracted~~ beam power is recorded for every ascending voltage increment of .1Volt for .5W, 1.5W, 2W and 2.5W input laser powers. Different laser powers are used to check: If the characteristic of AOM is input power dependent, which it should not be. RF-input voltage Vs 1st order diffracted beam power will help us in obtaining the best workable range of voltages over which power increases linearly. It will also help us in characterizing the relationship between the voltage and diffracted power. This is very important in data analysis. While data acquisition we can not measure the laser power in trap ~~its~~ is unpractical but if know the characteristic RF-input voltage Vs laser power in trap we can calculate the laser power in trap from the voltage. The data is presented below:	+	In normal mode, AOM is controlled through NI-DAQ by LabView program. Voltage input for RF-input is from 1 Volt to 5 Volts in any Volt increment. 1st order diffraction beam power is recorded for every ascending voltage increment of .1Volt for .5W, 1.5W, 2W and 2.5W input laser powers. Different laser powers are used to check: If the characteristic of AOM is input laser power dependent (which it should not be). RF-input voltage Vs 1st order diffracted beam power will help us in obtaining the best workable range of voltages over which power increases linearly. It will also help us in characterizing the relationship between the voltage and diffracted power. This is very important in data analysis. While data acquisition we can not measure the laser power in trap, it is unpractical but if know the characteristic RF-input voltage Vs laser power in trap we can calculate the laser power in trap from the voltage using the characteristic curve. The data is presented below:
		+
	{{ShowGoogleExcel\|id=0ApjWjFYiQdkfdDhNLXZOMUZwYXpONzhIU3V3MElicHc\|width=800\|height=600}}		{{ShowGoogleExcel\|id=0ApjWjFYiQdkfdDhNLXZOMUZwYXpONzhIU3V3MElicHc\|width=800\|height=600}}

	====Result:====		====Result:====
-	*Data Sheet 1 and Chart 1: By looking the chart it’s clear; diffracted beam power is not linearly related with voltage. It has strange characteristic, which is same for all laser powers: So there is no laser power dependence and any laser power can be chosen to define the AOM characteristic. Characteristic: It runs somewhat exponentially in the beginning from 1 to 1.4 volts, somewhat linear between 1.5 to 3.1 volts (the two straight vertical lines on the chart represents that) and second degree polynomial in the end from 3.2 to 5 volts. '''''So the most appropriate workable range for linear power modulation (in relatively same size of steps) is from 1.5 to 3.1 Volts at any input laser power.'''''	+	*Data Sheet 1 and Chart 1: By looking the chart it’s clear; diffracted beam power is not linearly related with voltage. It has strange characteristic, which is same for all laser powers: So there is no laser power dependence and any laser power can be chosen to define the AOM characteristic. Characteristic: It runs somewhat exponentially in the beginning from 1 to 1.4 volts, somewhat linear between 1.5 to 3.1 volts (the two straight vertical lines on the chart represents that) and second degree polynomial in the end from 3.2 to 5 volts. '''''So the most appropriate workable range for linear power modulation (in relatively same size of steps) is from 1.5 to 3.1 Volts at any input laser power.'''''
		+
		+	Now since i have the characteristic curve i can calculate the laser power in the trap through the applied RF-input voltage, for data analysis.

	* Data Chart3: Shows how power increases in % over 1 to 5 Volts at 2W of laser power. By joining the head of each histogram the characteristic curve can be traced out. Between 1.5 and 3.1 Volt the power increases almost in same step size of avg 3.45% (.069W) /step in comparison to .8% (not linear; over range of 1 to 1.4 Volts) and .42% (not linear; over range of 3.1 to 5 Volt). '''''3.45% step size is more convenient for power modulation and power is also linear over the steps.'''''		* Data Chart3: Shows how power increases in % over 1 to 5 Volts at 2W of laser power. By joining the head of each histogram the characteristic curve can be traced out. Between 1.5 and 3.1 Volt the power increases almost in same step size of avg 3.45% (.069W) /step in comparison to .8% (not linear; over range of 1 to 1.4 Volts) and .42% (not linear; over range of 3.1 to 5 Volt). '''''3.45% step size is more convenient for power modulation and power is also linear over the steps.'''''

	* Data Chart 2: Shows power step in %; the difference between the two consecutive power-increments over the difference in the two consecutive voltage increments (.1 Volt; steps). It gives us the better idea of over what range of voltage, the steps are over all large with somewhat of same histogram height difference. The region between 1.5 to 3.21 Volts contains that.		* Data Chart 2: Shows power step in %; the difference between the two consecutive power-increments over the difference in the two consecutive voltage increments (.1 Volt; steps). It gives us the better idea of over what range of voltage, the steps are over all large with somewhat of same histogram height difference. The region between 1.5 to 3.21 Volts contains that.
		+
	[[Category:AOM]]		[[Category:AOM]]

Pranav Rathi: /* Result: */

2012-11-15T17:54:08Z

Result:

←Older revision		Revision as of 17:54, 15 November 2012
Line 15:		Line 15:
	'''''The relationship is linear. AOM gives an average output power of 70% in 1st order diffraction beam .''''' This help us calculating the usable power of any input power without measurement; for example if I set the laser on .10W, then the usable power at the tweezers is 70% of it, which is .07W or 70mW. The maximum usable power for the tweezers is 2.66W. If we want to stay in the single mode operation regime, it is 1.4W (at room temperature). When the laser is cooled down to 60F, it is stretched to 1.9W (2.75W input).		'''''The relationship is linear. AOM gives an average output power of 70% in 1st order diffraction beam .''''' This help us calculating the usable power of any input power without measurement; for example if I set the laser on .10W, then the usable power at the tweezers is 70% of it, which is .07W or 70mW. The maximum usable power for the tweezers is 2.66W. If we want to stay in the single mode operation regime, it is 1.4W (at room temperature). When the laser is cooled down to 60F, it is stretched to 1.9W (2.75W input).

-	''Note: This study was done with 10634nm 4W coherent compass laser. My study showed that this particular laser trips to higher transverse modes at the power above 1.7W [[User:Pranav_Rathi/Notebook/OT/2010/04/13/Mode_profiling_at_high_power]].	+	''Note: This study was done with 10634nm 4W coherent compass laser. My study showed that this particular laser trips to higher transverse modes at the power above 1.7W.
-	Later on we replaced this laser with 1064nm 2W crysta laser which did not have any of the problems [[User:Pranav_Rathi/Notebook/OT/2010/08/18/CrystaLaser_specifications]].''	+
		+	[[User:Pranav_Rathi/Notebook/OT/2010/04/13/Mode_profiling_at_high_power]]
		+
		+	Later on we replaced this laser with 1064nm 2W crysta laser which did not have any of the problems.
		+
		+	[[User:Pranav_Rathi/Notebook/OT/2010/08/18/CrystaLaser_specifications]]''

	===Normal mode operation characterization===		===Normal mode operation characterization===

Pranav Rathi: /* Result: */

2012-11-15T17:51:40Z

Result:

←Older revision		Revision as of 17:51, 15 November 2012
Line 15:		Line 15:
	'''''The relationship is linear. AOM gives an average output power of 70% in 1st order diffraction beam .''''' This help us calculating the usable power of any input power without measurement; for example if I set the laser on .10W, then the usable power at the tweezers is 70% of it, which is .07W or 70mW. The maximum usable power for the tweezers is 2.66W. If we want to stay in the single mode operation regime, it is 1.4W (at room temperature). When the laser is cooled down to 60F, it is stretched to 1.9W (2.75W input).		'''''The relationship is linear. AOM gives an average output power of 70% in 1st order diffraction beam .''''' This help us calculating the usable power of any input power without measurement; for example if I set the laser on .10W, then the usable power at the tweezers is 70% of it, which is .07W or 70mW. The maximum usable power for the tweezers is 2.66W. If we want to stay in the single mode operation regime, it is 1.4W (at room temperature). When the laser is cooled down to 60F, it is stretched to 1.9W (2.75W input).

-	''Note: This study was done with 10634nm 4W coherent compass laser. My study showed that this particular laser trips to higher transverse modes at the power above 1.7W. Later on we replaced this laser with 1064nm 2W crysta laser which did not have any of the problems.''	+	''Note: This study was done with 10634nm 4W coherent compass laser. My study showed that this particular laser trips to higher transverse modes at the power above 1.7W [[User:Pranav_Rathi/Notebook/OT/2010/04/13/Mode_profiling_at_high_power]].
		+	Later on we replaced this laser with 1064nm 2W crysta laser which did not have any of the problems [[User:Pranav_Rathi/Notebook/OT/2010/08/18/CrystaLaser_specifications]].''

	===Normal mode operation characterization===		===Normal mode operation characterization===

Pranav Rathi: /* CW mode operation characterization: */

2012-11-15T17:46:22Z

CW mode operation characterization:

←Older revision		Revision as of 17:46, 15 November 2012
Line 9:		Line 9:

	===CW mode operation characterization:===		===CW mode operation characterization:===
-	The AOM is operating in CW mode. Data is recorded; laser power (.25W to 4W in .25W increments) Vs 1st order beam ~~power~~. ~~This~~ 1st order beam ~~power~~ is the usable power for ~~tweezer~~.	+	The AOM is operating in CW mode. Data is recorded; laser power (.25W to 4W in .25W increments) Vs lase power in 1st order diffraction beam. The laser power in 1st order diffraction beam is the usable power for optical tweezers.
	The data is presented below:		The data is presented below:
	{{ShowGoogleExcel\|id=0ApjWjFYiQdkfdHZ1VTdkaGFGbDFnSmtpUHJGdzR5aWc\|width=800\|height=500}}		{{ShowGoogleExcel\|id=0ApjWjFYiQdkfdHZ1VTdkaGFGbDFnSmtpUHJGdzR5aWc\|width=800\|height=500}}
	====Result:====		====Result:====
-	'''''The relationship is linear. ~~So the~~ AOM gives output power ~~in 1st order diffracted beam,~~ of ~~average around~~ 70% ~~of the input power (~~in ~~CW mode)~~.''''' This help us calculating the usable power of any input power without ~~measuring~~; for example if I set the laser on .10W, then the usable power at the ~~tweezer~~ is 70% of it, which is .07W or 70mW.The maximum usable power for the ~~tweezer~~ is 2.66W. If we want to stay in the single mode operation regime, it is 1.4W (at room temperature). When the laser is cooled down to 60F, it is stretched to 1.9W (2.75W input).	+	'''''The relationship is linear. AOM gives an average output power of 70% in 1st order diffraction beam .''''' This help us calculating the usable power of any input power without measurement; for example if I set the laser on .10W, then the usable power at the tweezers is 70% of it, which is .07W or 70mW. The maximum usable power for the tweezers is 2.66W. If we want to stay in the single mode operation regime, it is 1.4W (at room temperature). When the laser is cooled down to 60F, it is stretched to 1.9W (2.75W input).
		+
		+	''Note: This study was done with 10634nm 4W coherent compass laser. My study showed that this particular laser trips to higher transverse modes at the power above 1.7W. Later on we replaced this laser with 1064nm 2W crysta laser which did not have any of the problems.''

	===Normal mode operation characterization===		===Normal mode operation characterization===

Pranav Rathi: /* Introduction: */

2012-11-15T17:35:38Z

Introduction:

←Older revision		Revision as of 17:35, 15 November 2012
Line 1:		Line 1:
	==AOM Characterization==		==AOM Characterization==
	===Introduction:===		===Introduction:===
-	~~The motive of this is~~ to ~~study~~ AOM as power modulator for the tweezers. AOM (Gooch & Housego R23080-2-1.06-LTD; 138252) operates in CW and normal mode. ~~We use~~ 1st order ~~diffracted~~ beam. ~~First~~ CW mode operation is ~~characterized, to know the usable~~ power ~~(of the diffracted~~ beam) Vs ~~ascending~~ input laser power. ~~Second~~ normal mode operation is ~~characterized: Computer controlled ascending~~ input voltage ~~for RF signal power~~ Vs ~~usable~~ power ~~of the diffracted~~ beam, at several input laser powers. ~~The~~ laser ~~temperature is kept constant at 62F~~.	+	I am going to use AOM as power modulator for the tweezers: AOM (Gooch & Housego R23080-2-1.06-LTD; 138252) operates in CW and normal mode.I am using 1st order diffraction beam. So there is need to characterize 1st order in CW and normal mode. In cw mode-operation characterization is done; power output in 1st order diffraction beam Vs input laser power in ascending order. In normal mode-operation Characterization is done; analog RF-input voltage Vs output power in 1st order diffraction beam, for several input laser powers. I control laser power in 1st order diffraction beam through NI-DAQ (which applies an analog voltage signal from 1 to 5 volts in any increments) controlled by "feedback control 96main" program written in Labview V7.1.

	===Setup:===		===Setup:===

Pranav Rathi: /* Normal mode operation characterization */

2012-11-15T17:06:14Z

Normal mode operation characterization

←Older revision		Revision as of 17:06, 15 November 2012
Line 16:		Line 16:

	===Normal mode operation characterization===		===Normal mode operation characterization===
-	In normal mode, AOM is controlled through NI-DAQ by LabView program. Voltage input for RF signal is from 1 Volt to 5 Volts in any Volt increment. 1st order diffracted beam power is recorded for every ascending voltage increment of .1Volt for .5W, 1.5W, 2W and 2.5W input laser powers. Different laser powers are used to check ~~if any how~~ the characteristic of ~~the~~ AOM is input power dependent, which it should not be. RF ~~signal~~ Vs diffracted beam power will help us in obtaining the best workable range of voltages over which power increases linearly. I will also help us in characterizing the relationship between the voltage and diffracted power. The data is presented below:	+	In normal mode, AOM is controlled through NI-DAQ by LabView program. Voltage input for RF signal is from 1 Volt to 5 Volts in any Volt increment. 1st order diffracted beam power is recorded for every ascending voltage increment of .1Volt for .5W, 1.5W, 2W and 2.5W input laser powers. Different laser powers are used to check: If the characteristic of AOM is input power dependent, which it should not be. RF-input voltage Vs 1st order diffracted beam power will help us in obtaining the best workable range of voltages over which power increases linearly. It will also help us in characterizing the relationship between the voltage and diffracted power. This is very important in data analysis. While data acquisition we can not measure the laser power in trap its is unpractical but if know the characteristic RF-input voltage Vs laser power in trap we can calculate the laser power in trap from the voltage. The data is presented below:
	{{ShowGoogleExcel\|id=0ApjWjFYiQdkfdDhNLXZOMUZwYXpONzhIU3V3MElicHc\|width=800\|height=600}}		{{ShowGoogleExcel\|id=0ApjWjFYiQdkfdDhNLXZOMUZwYXpONzhIU3V3MElicHc\|width=800\|height=600}}

Pranav Rathi: /* Normal mode operation characterization */

2012-11-15T16:46:26Z

Normal mode operation characterization

←Older revision		Revision as of 16:46, 15 November 2012
Line 16:		Line 16:

	===Normal mode operation characterization===		===Normal mode operation characterization===
-	In normal mode, AOM is controlled by ~~our~~ LabView program. Voltage input for RF signal is from ~~–ve1~~ Volt to ~~–ve5~~ Volts in ~~–ve.1~~ Volt increment. 1st order diffracted beam power is recorded for every ascending voltage increment for .5W, 1.5W, 2W and 2.5W input laser powers. Different laser powers are used to check if any how the characteristic of the AOM is input power dependent, which it should not be. RF signal Vs diffracted beam power will help us in obtaining the best workable range of voltages over which power increases linearly. I will also help us in characterizing the relationship between the voltage and diffracted power. The data is presented below:	+	In normal mode, AOM is controlled through NI-DAQ by LabView program. Voltage input for RF signal is from 1 Volt to 5 Volts in any Volt increment. 1st order diffracted beam power is recorded for every ascending voltage increment of .1Volt for .5W, 1.5W, 2W and 2.5W input laser powers. Different laser powers are used to check if any how the characteristic of the AOM is input power dependent, which it should not be. RF signal Vs diffracted beam power will help us in obtaining the best workable range of voltages over which power increases linearly. I will also help us in characterizing the relationship between the voltage and diffracted power. The data is presented below:
	{{ShowGoogleExcel\|id=0ApjWjFYiQdkfdDhNLXZOMUZwYXpONzhIU3V3MElicHc\|width=800\|height=600}}		{{ShowGoogleExcel\|id=0ApjWjFYiQdkfdDhNLXZOMUZwYXpONzhIU3V3MElicHc\|width=800\|height=600}}

Pranav Rathi: /* Introduction: */

2012-11-15T16:35:24Z

Introduction:

←Older revision		Revision as of 16:35, 15 November 2012
Line 1:		Line 1:
	==AOM Characterization==		==AOM Characterization==
	===Introduction:===		===Introduction:===
-	The motive of ~~doing~~ this is to ~~attend enough information, to use~~ AOM as power modulator for the ~~tweezer~~. AOM (Gooch & Housego R23080-2-1.06-LTD; 138252) operates in CW and normal mode. We use 1st order diffracted beam. First CW mode operation is characterized, to know the usable power (of the diffracted beam) Vs ascending input laser power. Second normal mode operation is characterized: Computer controlled ascending input voltage for RF signal power Vs usable power of the diffracted beam, at several input laser powers. The laser temperature is kept constant at 62F.	+	The motive of this is to study AOM as power modulator for the tweezers. AOM (Gooch & Housego R23080-2-1.06-LTD; 138252) operates in CW and normal mode. We use 1st order diffracted beam. First CW mode operation is characterized, to know the usable power (of the diffracted beam) Vs ascending input laser power. Second normal mode operation is characterized: Computer controlled ascending input voltage for RF signal power Vs usable power of the diffracted beam, at several input laser powers. The laser temperature is kept constant at 62F.

	===Setup:===		===Setup:===