THORLABS GVS001 Manuel utilisateur

HA0193T

GVS001 and GVS002

GVS101 and GVS102

GVS201 and GVS202

Small Beam Diameter

Scanning Galvo Systems

User Guide

Original Instructions

Single and Dual Axis Scanning Galvo Systems for Small Beam Diameters

Table of Contents

Chapter 1 Safety Information .............................................................................................1

Chapter 2 Overview .............................................................................................................3

2.2.1 Introduction................................................................................................................................................. 3

2.2.2 The Galvanometer..................................................................................................................................... 3

2.2.3 The Mirror ................................................................................................................................................... 4

2.2.4 Servo Driver Board.................................................................................................................................... 5

Chapter 3 Installation and Initial Setup ............................................................................6

3.2.1 Motor Assembly Dimensions ................................................................................................................... 6

3.2.2 Mirror Dimensions ..................................................................................................................................... 6

3.2.3 Single Axis Mount Dimensions ................................................................................................................ 7

3.2.4 XY Mount Dimensions .............................................................................................................................. 8

3.2.5 Heatsink Dimensions ................................................................................................................................ 8

3.2.6 Servo Driver Board Baseplate Dimensions ........................................................................................... 9

3.3.1 Introduction................................................................................................................................................. 9

3.3.2 Fitting the Heatsinks................................................................................................................................ 10

3.3.3 Typical System Setup ............................................................................................................................. 11

3.4.1 Choosing a Power Supply...................................................................................................................... 12

3.4.2 Using the GPS011 Linear Power Supply ............................................................................................. 12

3.4.3 Electrical Connections ............................................................................................................................ 13

3.4.4 Diagnostic Signal Descriptions .............................................................................................................. 17

3.4.5 Setting the Volts/Degree Scaling Factor .............................................................................................. 17

Chapter 4 Operation ..........................................................................................................18

Chapter 5 Troubleshooting ..............................................................................................20

Chapter 6 Specifications and Associated Parts............................................................24

HA0193T

Chapter 7 Calculating the Power Dissipation................................................................26

7.1.1 Calculating the Required Thermal Conductivity .................................................................................. 26

Chapter 8 Reasons for Image Distortion........................................................................27

Chapter 9 Certifications and Compliance ......................................................................28

Chapter 10 Thorlabs Worldwide Contacts .......................................................................29

Single and Dual Axis Scanning Galvo Systems for Small Beam Diameters Chapter 1: Safety Information

Rev. 25, July 17, 2023 Page 1

Chapter 1 Safety Information

For the continuing safety of the operators of this equipment, and the protection of the equipment itself, the

operator should take note of the Warnings, Cautions and Notes throughout this handbook and, where visible,

on the product itself.

Warning: Risk of Electrical Shock

Given when there is a risk of electrical shock.

Warning

Given when there is a risk of injury to users.

Caution

Given when there is a possibility of damage to the product.

Note

Clarification of an instruction or additional information.

General Warnings and Cautions

Warning

If this equipment is used in a manner not specified by the manufacturer, the equipment might

malfunction. Excessive moisture may impair operation.

Spillage of fluid, such as sample solutions, should be avoided. If spillage does occur, clean up

immediately using absorbent tissue. Do not allow spilled fluid to enter the internal mechanism.

Although the unit does not emit radiation it does redirect laser radiation emitted from other

devices. Operators must follow all safety precautions provided by the manufacturer of any

associated laser devices.

Caution

When connecting the driver boards and motors use only the cables supplied. Do not extend

the cables. The driver boards and motors are calibrated with these cables. Using different

cables will affect the performance of the system.

Single and Dual Axis Scanning Galvo Systems for Small Beam Diameters Chapter 1: Safety Information

Page 2 ETN013002-D02

Caution

The driver circuit board is shipped calibrated and ready for use. The only adjustments

necessary are setting the Volts/Degree Scaling factor (see section 3.4.5 and if required, setting

the device for external enabling see section 4.2).

Do not attempt to make any other adjustments or remove/fit any other jumpers than those

explicitly described in the following sections as this could invalidate the warranty.

Warning

Please install the metal covers GCE001 to prevent any damage to the motors and PCBs as the

galvo boards contain electrostatic discharge-sensitive components.

EMC Compatibility and ESD Precautions

Caution

Galvos must be shielded from external interference, ground loops, and electrostatic discharge

because they are components and not finished goods. If the covers are not used, a 4kV ESD

can touch the PCB and harm it. Please install covers to shield the boards from ESD.

Note

The customer must adhere to EMC and ESD best practices when integrating any galvo parts

into their systems.

The customer should insulate the galvo and the PCB with shielding and/or ferrite beads if radiofrequency

signals are present in the system since motors can be susceptible to outside radio frequency radiation.

Motors can be sensitive to external radio frequency signals; the customer should protect the galvo and the

PCB with shielding and/or ferrite beads if radio frequency signal are present in the system.

For instance, a Würth Elektronik ferrite 742 711 31 S placed over the motor cable of the large galvo system

can improve immunity between 105 and 115MHz.

Single and Dual Axis Scanning Galvo Systems for Small Beam Diameters Chapter 2: Overview

Rev. 25, July 17, 2023 Page 3

Chapter 2 Overview

Introduction

The GVS series scanning galvo systems are board level, mirror positioning systems, designed for integration

into OEM or custom laser beam steering applications. The single axis systems consist of a motor and mirror

assembly, a mounting bracket, a tuned driver card and a heat sink. The dual axis systems comprise two mirror

and motor assemblies, an X-Y mounting bracket, two driver cards and two heat sinks. The driver cards feature

a small footprint, fixings for easy mounting to a heatsink and a simple analog command signal interface.

A choice of mirror coating is available as follows:

GVS001 and GVS002: Single- and Dual-Axis Systems with Protected Silver Mirrors

GVS101 and GVS102: Single- and Dual-Axis Systems with Protected Gold Mirrors

GVS201 and GVS202: Single- and Dual-Axis Systems with 400-750 nm Broadband Dielectric Mirrors

Typical applications include laser scanning, laser microscopy, and laser marking.

Figure 1 GVS002 2-Axis Galvo System (Post Adapter and Post Not Included)

System Description

2.2.1 Introduction

Galvo Scanners are widely used in applications such as laser etching, confocal microscopy, and laser imaging.

A galvanometer is a precision motor with a limited travel, usually much less than 360 degrees, whose

acceleration is directly proportional to the current applied to the motor coils. When current is applied, the

motor shaft rotates through an arc. Motion is stopped by applying a current of reverse polarity. If the current

is removed, the motor comes to rest under friction.

Typically, the term 'Galvo' refers only to the motor assembly, whereas a 'Galvo Scanner' would include the

motor, together with a mirror, mirror mount and driver electronics.

A description of each component in the system is contained in the following sections.

2.2.2 The Galvanometer

The galvanometer consists of two main components: a motor that moves the mirror and a detector that feeds

back mirror position information to the system.

Single and Dual Axis Scanning Galvo Systems for Small Beam Diameters Chapter 2: Overview

Page 4 ETN013002-D02

Figure 2 GVS002 Dual Axis Galvo/Mirror Assembly

Our galvo motor features a moving magnet, which means that the magnet is part of the rotor and the coil is

part of the stator. This configuration provides faster response and higher system-resonant frequencies when

compared to moving coil configurations.

Mirror position information is provided by an optical position detector, which consists of two pairs of

photodiodes and a light source. As the galvo and mirrors are moved, differing amounts of light are detected

by the photodiodes and the current produced is relative to the galvo actuator position.

2.2.3 The Mirror

The mirror assembly is attached to the end of the actuator and deflects the light beam over the angular range

of the motor shaft. Scanning galvo applications demand high speed and frequencies of the shaft rotation, and

so the inertia of the actuator and mirror assembly can have a profound effect on the performance of the

system. High resonant frequencies and enhanced stiffness in the mirror assembly also add to system

performance by increasing bandwidth and response times.

Wavelength ranges and damage threshold of the different mirror coatings are detailed below:

Table 1 Wavelength Ranges and Damage Threshold

Part Number Coating Wavelength Damage Threshold

GVS00x

Silver

500 nm - 2.0 µm

3 J/cm2at 1064 nm, 10 ns pulse

GVS10x

Gold

800 nm - 20.0 µm

2 J/cm2at 1064 nm, 10 ns pulse

GVS20x

E02

400 nm - 750 nm

0.25 J/cm2 at 532 nm, 10 ns

pulse

Single and Dual Axis Scanning Galvo Systems for Small Beam Diameters Chapter 2: Overview

Rev. 25, July 17, 2023 Page 5

Figure 3 Mirror Assembly Detail

2.2.4 Servo Driver Board

The servo circuit interprets the signals from the position detector, then uses positional error, speed and

integral of current terms to output control voltages to drive the actuator to the demanded position.

The scanner uses a non-integrating, Class 0 servo, which enables higher system speeds compared to

integrating servo systems and is ideal for use in applications that require vector positioning (e.g., laser

marking) or raster positioning (printing or scanning laser microscopy). It can also be used in some step and

hold applications.

Furthermore, the proportional derivative circuit gives excellent dynamic performance and includes an

additional current term to ensure stability at high accelerations. The diagram below shows the architecture of

the driver in more detail.

Figure 4 Servo Driver Board Schematic Diagram

Figure 5 Servo Driver Circuit Board

Single and Dual Axis Scanning Galvo Systems for Small Beam Diameters Chapter 3: Installation and Initial Setup

Page 6 ETN013002-D02

Chapter 3 Installation and Initial Setup

Environmental Conditions

Warning

Operation outside the following environmental limits may adversely affect operator safety.

The unit is designed for indoor use only.

To ensure reliable operation, the unit should not be exposed to corrosive agents or excessive moisture, heat,

or dust.

The unit is not designed to be used in explosive environments.

If the unit has been stored at a low temperature or in an environment of high humidity, it must be allowed to

reach ambient conditions before being powered up.

Dimensions

3.2.1 Motor Assembly Dimensions

Figure 6 Motor Dimensions

3.2.2 Mirror Dimensions

Figure 7 Mirror Dimensions

Single and Dual Axis Scanning Galvo Systems for Small Beam Diameters Chapter 3: Installation and Initial Setup

Rev. 25, July 17, 2023 Page 7

3.2.3 Single Axis Mount Dimensions

Figure 8 Single Axis Mounting Bracket Dimensions

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