THORLABS LCC3111H Manual de usuario

Liquid Crystal Noise Eaters

User Guide

Liquid Crystal Noise Eater

Page 1 Rev C, Dec 8, 2015

Table of Contents

Chapter 1Warning Symbol Definitions ...........................................2

Chapter 2Safety.................................................................................3

Chapter 3Product Overview.............................................................4

Chapter 4Setup..................................................................................5

4.1.MountingandAlignment...............................................5

4.2.PowerSupply.................................................................6

4.3.PoweringONtheNoiseEater.........................................6

4.4.BeamCentering.............................................................6

Chapter 5Operation...........................................................................7

5.1.SelectingthePowerRange............................................7

5.2.ModulatetheOutputPower........................................10

5.3.SettingtheOutputPowerLevel...................................10

5.3.1.Maximizing the Output Power Using an External Measurement

Device........................................................................................11

5.3.2.Maximizing the Output Power Using the Indicator LED.............12

Chapter 6Specifications.................................................................13

Chapter 7Mechanical Drawing.......................................................15

Chapter 8Maintenance....................................................................16

8.1.Troubleshooting..........................................................16

Chapter 9Regulatory.......................................................................17

9.1.WasteTreatmentisYourOwnResponsibility...............17

9.2.EcologicalBackground.................................................17

Chapter 10Thorlabs Worldwide Contacts.......................................18

Liquid Crystal Noise Eater Chapter 1: Warning Symbol Definitions

Page 2

Chapter 1 Warning Symbol Definitions

Below is a list of warning symbols you may encounter in this manual or on your

device.

Symbol Description

Direct Current

Alternating Current

Both Direct and Alternating Current

Earth Ground Terminal

Protective Conductor Terminal

Frame or Chassis Terminal

Equipotentiality

On (Supply)

Off (Supply)

In Position of a Bi-Stable Push Control

Out Position of a Bi-Stable Push Control

Caution: Risk of Electric Shock

Caution: Hot Surface

Caution: Risk of Danger

Warning: Laser Radiation

Caution: Spinning Blades May Cause Harm

Liquid Crystal Noise Eater

Page 3 Rev C, Dec 8, 2015

Chapter 2 Safety

Do Not Open Housing!

The Noise Eater has no user-serviceable parts. Service should only be

performed by trained service personnel.

All statements regarding safety of operation and technical data in this instruction

manual will only apply when the unit is operated correctly.

WARNING

Laser Radiation – Avoid Exposure to Beam

Liquid Crystal Noise Eater Chapter 3: Product Overview

Page 4

Chapter 3 Product Overview

Thorlabs’ Liquid Crystal Noise Eaters are precision instruments for stabilizing and

attenuating laser power. The noise eater consists of a variable attenuator (liquid

crystal wave plate and polarizer), a calibrated beam splitter, and a servo

controller to control the modulator, as depicted in the block diagram below.

Figure 1 Noise Eater Block Diagram

Linearly polarized light is input into the liquid crystal retarder, which, together with

the output polarizer, acts as a variable retarder. A beamsplitter then sends a

small part of the beam to a feedback loop consisting of a photodiode and control

servo. The servo compares the optical signal to a preset signal level and applies

the appropriate adjustment voltage until the optical signal reaches the desired

level.

The noise eater can also be used as a variable attenuator even without the

presence of noise. By adjusting the resistance of the potentiometer, the user can

set the desired output power level.

Liquid Crystal Noise Eater

Page 5 Rev C, Dec 8, 2015

Chapter 4 Setup

4.1. Mounting and Alignment

The noise eater is designed to work with linearly polarized input light aligned with

the direction of the arrow near the input aperture. Linearly polarized light and

proper alignment of the direction of polarization are important for achieving the

best results from the noise eater.

In order to minimize optical losses, the noise eater does not have an input

polarizer. If the incident light is not linearly polarized, a linear polarizer (such as

our LPVIS or LPNIR polarizers) should be used before the noise eater.

If the incident light is linearly polarized but is not aligned exactly vertically or

horizontally, a half-wave plate can be used before the noise eater to rotate the

polarization axis. As shown in the photo below, the noise eater’s cage mount can

be used along with a CRM1 cage rotation mount to rotate the half-wave plate,

thus aligning the polarization axis with the noise eater.

Figure 2 CRM1 Cage Rotation Mount holding a Mounted Half-Wave Plate

(such as the WPH10M-633), secured to the LCC3111H Noise Eater with ER

Cage Rods

For post mounting, the noise eater is equipped with two 8-32 (M4) threaded

holes. These holes are offset by 90°, so that light with a vertical or horizontal

polarization axis can be aligned with the noise eater. The four 4-40 holes on the

front of the noise eater can also be used to mount the noise eater in either a

horizontal or vertical orientation using the Thorlabs Cage System

Liquid Crystal Noise Eater Chapter 4: Setup

Page 6

Figure 3 Horizontally and Vertically Mounted LCC3111H Noise Eaters. Note

the direction of the input polarization indicated by the double arrow.

4.2. Power Supply

The noise eater operates with 12 V DC power. We recommend using the AC/DC

power supply that is included with the noise eater for best performance.

4.3. Powering ON the Noise Eater

When the noise eater is connected to the power supply, it automatically powers

on. There is no additional power switch.

4.4. Beam Centering

For best performance of the noise eater, it is recommended that the beam is well

centered in the input aperture. Due to the optical path inside the noise eater, the

output beam will be shifted down by 1.0 mm if the noise eater is mounted

vertically as shown in Figure 3 (right). Similarly, the output beam will be shifted

sideways by 1.0 mm if the noise eater is mounted horizontally as in Figure 3

(left).

Liquid Crystal Noise Eater

Page 7 Rev C, Dec 8, 2015

Chapter 5 Operation

5.1. Selecting the Power Range

The LCC3112H and LCC3113H have two selection switches at the top of the

case which are used to select the input power range. When the high/low power

switch is set to “LOW”, the input power range can be set from 1 mW to 30 mW,

and when the status switch set to “HIGH”, the input power range can be set from

100 mW to 500. The LCC3111H and LCC3111L have only one selection switch

which can set the input power range from 1 mW to 30 mW or 100 mW to 500

mW. The power selector should be set to the lowest value that is still higher than

the actual power of the laser. For example, if the LCC3111L is being used with a

beam power of 8 mW at 635 nm, the selector should be set to 10 mW.

Figure 4 Top View of the LCC3111L (Left), LCC3111H (Center) and

LCC3112H/LCC3113H (Right) Noise Eaters

The LCC3111H and LCC3112H noise eaters use a Silicon detector, while the

LCC3113H uses a Germanium detector, as part of the feedback loop. The

responsivity of the detector is different for different wavelengths, and so the

power settings on the selector only correspond to the design wavelength of the

detector (635 nm for LCC3111H and LCC3111L, 780 nm for LCC3112H, 1550

nm for LCC3113H). The power range at a given wavelength is inversely

proportional to the responsivity (higher responsivity value will result lower power

range value). The graph below shows the relative responsivity of both detectors

at a range of wavelengths. The tables below show a rough estimate of the power

settings at various wavelengths for each model.

Liquid Crystal Noise Eater Chapter 5: Operation

Page 8

Figure 5 Noise Eaters Normalized Responsivity

5.2. Max Powers at Various Wavelengths

The tables below list the maximum input powers for each noise eater, specified

for a variety of input wavelengths and switch settings. Please note that these

maximum power levels correspond to the feedback electronics of the noise eater,

and in some cases, the actual maximum input power is instead limited by the

damage threshold of the noise eater. For the high power noise eaters

(LCC3111H, LCC3112H, and LCC3113H), this damage threshold is 8 W/cm2,

which corresponds to a maximum input power of 1 W if the input power is

distributed evenly across the Ø4 mm clear aperture. For the low power noise

eaters (LCC3111L, LCC3111, LCC3112, and LCC3113), the damage threshold

is 0.8 W/cm2, which corresponds to a maximum input power of 100 mW if the

input power is again distributed evenly across the Ø4 mm clear aperture.

Liquid Crystal Noise Eater

Page 9 Rev C, Dec 8, 2015

LCC3111H Max Input Power at Various Wavelengths

Switch

Status Power Level

at 450 nm Power Level

at 550 nm Power Level

at 635 nm

100 mW 200 mW 150 mW 100 mW

300 mW 600 mWa450 mW 300 mW

500 mW 1000 mWa750 mWa500 mW

LCC3111L Max Input Power at Various Wavelengths

Switch

Status Power Level

at 450 nm Power Level

at 550 nm Power Level

at 635 nm

1 mW 2 mW 1.5 mW 1 mW

3 mW 6 mW 4.5 mW 3 mW

5 mW 20 mW 15 mW 10 mW

30 mW 60 mW 45 mW 30 mW

LCC3112H Power Ranges at Various Wavelengths

Switch

Status

Power

Level at

650 nm

Power

Level at

700 nm

Power

Level at

780 nm

Power

Level at

900 nm

Power

Level at

1000 nm

Power Level

at 1100 nm

Low A 1.2 mw 1.1 mW 1 mW 0.9 mW 0.9 mW 3.3 mW

Low B 3.5 mW 3.3 mW 3 mW 2.6 mW 2.7 mW 10.0 mW

Low C 11.8 mW 11.1 mW 10 mW 8.8 mW 8.9 mW 33.3 mW

Low D 35.5 mW 33.3 mW 30 mW 26.3 mW 26.8 mW 100.0 mW

High A 120.0 mW 111.0 mW 100 mW 86.0 mW 89.3 mW 333 mW

High B 355.5 mW 333.0 mW 300 mW 258.0 mW 268 mW 999 mWa

High C 600.0 mWa500 mW 500 mW 430.0 mW 446.6mW 1650 mWa

LCC3113H Power Ranges at Various Wavelengths

Switch

Status

Power

Level at

1050 nm

Power

Level at

1150 nm

Power

Level at

1250 nm

Power

Level at

1350 nm

Power

Level at

1450 nm

Power

Level at

1550 nm

Power

Level at

1620 nm

Low A 1.9 mW 1.6 mW 1.4 mW 1.2 mW 1.0 mW 1 mW 1.6 mW

Low B 5.8 mW 4.8 mW 4.1 mW 3.5 mW 3.1 mW 3 mW 4.8 mW

Low C 19.2 mW 16.0 mW 13.7 mW 11.7 mW 10.4 mW 10 mW 16 mW

Low D 57.6 mW 48.0 mW 41.1 mW 35.1 mW 31.3 mW 30 mW 48 mW

High A 190 mW 160 mW 137 mW 117 mW 104.7 mW 100 mW 160 mW

High B 500 mW 480 mW 411 mW 351 mW 313.4 mW 300 mW 480 mW

High C 835 mWa800 mWa685 mWa585 mWa520 mWa500 mW 800 mWa

a. The maximum power levels specified here are for the feedback electronics, but the maximum

input power at these settings is limited by the damage threshold of the liquid crystal retarder,

which is 8 W/cm2. See the section 5.2, Max Powers at Various Wavelengths, for details.

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