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Noise Eaters / Laser Amplitude Stabilizers
Front Back NEL02 Noise Eater with Application Idea NEL01 Please Wait Click to Enlarge Noise Attenuation Factor is the Ratio of Noise Amplitude Before and After the Noise Eater Features
Thorlabs' Liquid Crystal Noise Eaters / Laser Amplitude Stabilizers are precision instruments for stabilizing, modulating, and attenuating the power of linearly polarized light. These closedloop systems are designed for use with light in the 425  650 nm (NEL01), 475  650 nm (NEL02), 650  1050 nm (NEL03), or 1050  1620 nm (NEL04) wavelength range. We offer noise eater models for low (<60 mW) or high (<1.65 W) power use, all with external modulation inputs. See the Specs tab for details. Noise Reduction Click for Details NEL02 Top View Showing Power Range Adjustment Switches and Modulation Input Click to Enlarge Noise Eater Block Diagram Power Attenuation and Modulation Thorlabs' Noise Eaters are post mountable in two orientations via 832 (M4) tapped holes. They also feature 440 tapped holes on the front and back for 30 mm Cage System compatibility and an SM1threaded (1.035"40) rear aperture for Ø1" Lens Tube compatibility.
Noise Eater Performance GraphsIn the graphs below, noise attenuation was measured as one of three parameters was varied: input power level, input signal modulation (noise) amplitude, and output signal attenuation. The graphs show that the noise eaters provide consistent performance regardless of changes in these parameters. Graph DefinitionsNoise Attenuation at Various Input Power Levels Noise Attenuation at Various Input Signal Modulations Noise Attenuation at Various Output Signal Power Levels Modulation Performance

NEL01 Max Power at Various Wavelengths  

Switch Position 
Max Power at 450 nm 
Max Power at 550 nm 
Max Power at 635 nm 
1  2 mW  1.5 mW  1 mW 
2  6 mW  4.5 mW  3 mW 
3  20 mW  15 mW  10 mW 
4  60 mW  45 mW  30 mW 
NEL02 Max Power at Various Wavelengths  

Switch Position 
Max Power at 450 nm 
Max Power at 550 nm 
Max Power at 635 nm 

L  1  2 mW  1.5 mW  1 mW 
L  2  6 mW  4.5 mW  3 mW 
L  3  20 mW  15 mW  10 mW 
L  4  60 mW  45 mW  30 mW 
H  1  200 mW  150 mW  100 mW 
H  2  600 mW^{a}  450 mW  300 mW 
H  3  1000 mW^{a}  750 mW^{a}  500 mW 
H  4  N/A^{b} 
NEL03 Max Power at Various Wavelengths  

Switch Position 
Max Power at 650 nm 
Max Power at 700 nm 
Max Power at 780 nm 
Max Power at 900 nm 
Max Power at 1000 nm 
Max Power at 1100 nm 

L  1  1.2 mW  1.1 mW  1 mW  0.9 mW  0.9 mW  3.3 mW 
L  2  3.5 mW  3.3 mW  3 mW  2.6 mW  2.7 mW  10.0 mW 
L  3  11.8 mW  11.1 mW  10 mW  8.8 mW  8.9 mW  33.3 mW 
L  4  35.5 mW  33.3 mW  30 mW  26.3 mW  26.8 mW  100 mW 
H  1  120 mW  111 mW  100 mW  86.0 mW  89.3 mW  333 mW 
H  2  355.5 mW  333 mW  300 mW  258.0 mW  268 mW  999 mW^{a} 
H  3  600 mW^{a}  500 mW  500 mW  430.0 mW  446.6 mW  1650 mW^{a} 
H  4  N/A^{b} 
NEL04 Max Power at Various Wavelengths  

Switch Position 
Max Power at 1050 nm 
Max Power at 1150 nm 
Max Power at 1250 nm 
Max Power at 1350 nm 
Max Power at 1450 nm 
Max Power at 1550 nm 
Max Power at 1650 nm 

L  1  1.9 mW  1.6 mW  1.5 mW  1.2 mW  1 mW  1 mW  1.6 mW 
L  2  5.8 mW  4.8 mW  4.1 mW  3.5 mW  3.1 mW  3 mW  4.8 mW 
L  3  19.2 mW  16 mW  13.7 mW  11.7 mW  10.4 mW  10 mW  16 mW 
L  4  57.6 mW  48 mW  41.1 mW  35.1 mW  31.3 mW  30 mW  48 mW 
H  1  190 mW  160 mW  137 mW  117 mW  104.7 mW  100 mW  160 mW 
H  2  500 mW  480 mW  411 mW  351 mW  313.4 mW  300 mW  480 mW 
H  3  835 mW^{a}  800 mW^{a}  685 mW^{a}  585 mW^{a}  520 mW^{a}  500 mW  800 mW^{a} 
H  4  N/A^{b} 
Posted Comments:  
gregory.hoth
(posted 20181023 15:38:40.257) Is it possible to use the modulation input of these noise eaters to control the DC power level?
It would be useful to have electronic control of the power transmitted by the noise eater. nbayconich
(posted 20181115 10:20:15.0) Thank you for contacting Thorlabs. Yes it is possible to modulate the input of the noise eaters in order to control the DC power level using the SMC interface, The noise eater can also be used as a variable attenuator, even without the presence of noise. A voltage ranging from 0 to 2.5 V can be input to modulate the output power as needed.
Please note that the output power cannot be modulated higher than the initial input power. The noise eater operates by varying how much of the signal is attenuated in order to reach the target output power and attenuate the noise. Since the noise eater can attenuate the signal but not amplify it, the clean output beam can only have a power as high as the minimum power level of the noisy signal. vytautas.purlys
(posted 20151005 06:39:56.403) 1. Is it possible to use the noise eater for 400kHz  80Mhz repetition rates of fs lasers? I need to stabilize the laser power for long durations (up to a few days), I don't need to stabilize the pulsetopulse stability.
2. How does the EO version work? Is the active element an electrooptical crystal or is it still liquid crystal based? besembeson
(posted 20151013 08:33:51.0) Response from Bweh at Thorlabs USA: These are ideal for CW lasers so it should be suitable at the higher repetition rates (close to 80MHz) but may not be suitable at the lower repetition rates. Also ensure the peak powers are within the limits we specify. The EO version has the same configuration, using a liquid crystal retarder and polarizer. We use the term EO since these have a modulation input that allows system to act as an optical switch. max.ulbrich
(posted 20150829 15:13:13.107) I have a 80mW, 561nm laser which has quite some fluctuations in intensity that I want to reduce. The beam diameter is 0.7mm 1/e2. Which product should I use? Can I keep the beam diameter or do I need to expand it before it passes the device?
Thanks, Max mthrossell
(posted 20150910 06:04:01.0) Response from Matt at Thorlabs USA: We will contact you directly through our Germany office to discuss your application. forget
(posted 20150610 16:59:04.63) What is the time response of the photodiode + amplifier ? Would the LCC3112H/M be usable on a 100 kHz laser at 1030 nm ? Thanks in advance for your answer.
Nicolas besembeson
(posted 20150921 09:21:27.0) Response from Bweh at Thorlabs USA: The response time for the photodiode and amplifier is about 0.35us. The attenuation will be worse than specified so it may not be suitable. In certain cases such as lasers having spikes or steplike output power fluctuations the device may not be able to completely eliminate high frequency noise. pan
(posted 20150407 07:43:26.793) Used LCC3112H on a Ti:Sa laser with 80MHz repetition rate, 800nm. Added noise eater to a beam path with 155mW max power output after the unit, tune to have 145mW output. Tested with PM100 for 10+ hours. See worse power stability with the noise eater. 10 hour drift on the order of ~3%.
Would appreciate comments/suggestions. jlow
(posted 20150417 01:14:25.0) Response from Jeremy at Thorlabs: We will contact you directly to troubleshoot this. elharel
(posted 20140814 13:32:15.683) Can the noise eater handle femtosecond pulses? What is the thickness of the beam splitter? I am concerned about significant dispersion caused by the device.
thanks besembeson
(posted 20140821 02:54:28.0) Response from Bweh at Thorlabs USA: The damage threshold is 10MW/cm^2 peak power and 8W/cm^2 for CW. You can compare your power density to these values. Regarding the dispersion, I will followup with you by email to determine which unit you are interested in, so that I can provide you information about the thickness and dispersion. emeyersc
(posted 20131108 10:13:44.257) Can the IR noise eater handle picosecond pulses from an OPO and still stabilize? What would be the damage threshold in this case (specifically, 1620 nm, 80 MHz, 3 ps)? jlow
(posted 20131112 10:34:37.0) Response from Jeremy at Thorlabs: Since 80MHz is much higher than the bandwidth of the noise eater (2.5kHz), the LCC3113 should still stabilize. The damage threshold is around 10MW/cm^2 peak power and 8W/cm^2 for CW. tcohen
(posted 20121112 13:05:00.0) Response from Tim at Thorlabs to Gediminas: Thank you for contacting us! A 6501100nm edition of our noise eater is currently in the works and will be released shortly. For your review, we will contact you with more information on this new product. gediminas.dauderis
(posted 20121112 02:01:19.23) Dear Sir/Madan,
Do you have some equipment like Liquid Crystal Noise Eater / Laser Stabilizer 1000 nm wavelength?
Yours Faithfully,
Gediminas Dauderis tcohen
(posted 20121107 21:29:00.0) Response from Tim at Thorlabs: This is correct. The noise attenuation falls off as frequency increases in the target bandwidth to 2.5kHz for this LC design. If you would be interested in a high bandwidth design we would love to discuss this with you as a possible future customer inspired product. mlau
(posted 20121031 21:15:06.233) If I'm reading the noise eater specs correctly, the attentuation falls with high frequency? Is that right? tcohen
(posted 20120709 13:06:00.0) Response from Tim at Thorlabs: The Noise Eater will be released soon. We should be able to assemble a 100mW version but the max beam diameter for this version is 4mm. john.burke
(posted 20120705 18:41:06.0) When will this be available? Is there any chance I could get a custom one with a larger aperature and power handling? I need about 100 mW so an aperature twice radius should be helpful. I could be willing to sacrifice bandwidth for long term stability and power handling.
Thanks! 
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