MesaPhotonics VideoFROG FROGscan Manuale utente

FROGscan products are protected by United States patents 8068230, 7130052, 6219142

Mesa Photonic’s Support Policy

We hope this product is trouble free and easy to use. Unfortunately, with all the operating systems,

computers, programs, and other systems beyond our control, it is impossible to guarantee the program

will work perfectly, 100% of the time. If you have problems with the program within 30 days of installation,

feel free to call us (and feel free to continue to call us until the problem is resolved). After that time, we

would prefer you e-mail us. If for some reason we cannot resolve the issue over the phone or via e-mail,

we will suggest you use a different computer. If that is not possible, we will be happy to fix the problem if

you send us your computer. We expect you to pay for shipping to our facility, but we will cover return

shipping (not necessarily air or insurance, however). If we are still unable to fix the problem, the only

solution is to use a different computer. We will not cover hardware issues in this matter. If you cannot get

the hardware to work on your computer, then your computer is incompatible with VideoFROGscan.

All users are entitled to free software upgrades within one year of delivery of the FROGscan. Software

upgrades come out periodically. Typically within a version, software upgrades are more frequent. If you

are not entitled to a free upgrade, the new upgrades are available at a reduced cost. We recommend

keeping your software up to date for the best support of your product.

What to e-mail us if you are unable to resolve the problem: E-mail Mesa Photonics the following files

along with a description of the problem: FROGscan.ini, MPFROGScanLogFile.txt. All of the files should

be located in the Mesa Photonics documents directory and sub-directories. Please send the e-mail to

support@mesaphotonics.com.

Mesa Photonics, LLC

1550 Pacheco Street

Santa Fe, NM 87505 USA

Tel: +1 505 216 5015

Fax: +1 866 569 6994

E-mail: support@mesaphotonics.com.

changes to the FROGscan system and the User’s Manual at any time and without prior notice. As

manuals and instructions are updated, omissions may occur. Consequently, Mesa Photonics does not

guarantee that the text contained in this User’s Manual is free from errors or omissions.

Contents

Chapter 1. Overview .....................................................................................................................................1

1.1 General Information.............................................................................................................................1

1.2 Safety Considerations .........................................................................................................................1

Optical radiation hazards.......................................................................................................................1

Electrical hazards...................................................................................................................................1

1.3 Specifications ......................................................................................................................................2

Environmental........................................................................................................................................2

Operational ............................................................................................................................................2

Instrument Specifications.......................................................................................................................2

1.4 FROGscan System Components and Beam Path..............................................................................3

Chapter 2. Setup...........................................................................................................................................4

2.1 Inspecting the FROGscan Shipment Contents ...................................................................................4

2.2 Setting up FROGscan .........................................................................................................................4

2.3 Installing VideoFROGscan Software...................................................................................................5

2.4 Opening the VideoFROGscan Software Program.........................................................................17

Chapter 3. Program Menus.........................................................................................................................18

3.1 Menu Panel .......................................................................................................................................18

3.2 Left Control Panel..............................................................................................................................20

3.2.1 Quitting VideoFROGscan software.............................................................................................22

3.3 Summary Panel.................................................................................................................................23

3.4 Data Acquisition Panel ......................................................................................................................24

3.4.1 Automated Crystal Tilt Function..................................................................................................26

3.5 Setup and Alignment Panel...............................................................................................................27

3.6 Pulse Display Panel...........................................................................................................................29

3.7 Pulse Analysis Panel.........................................................................................................................30

3.8 Program Information Panel ...............................................................................................................31

3.9 FROG Trace Panel............................................................................................................................32

3.10 Error Analysis Panel........................................................................................................................33

Chapter 4. Aligning a LASER Beam into FROGscan .................................................................................34

4.1 Aligning a LASER Beam into FROGscan without Alignment Cameras ............................................34

4.2 Aligning a LASER Beam into FROGscan using Alignment Cameras...............................................36

Chapter 5. Maximizing the Intensity of the Signal Beam ............................................................................38

5.1 Optimizing the Crystal Tilt..................................................................................................................39

5.2 Optimizing the Entry of the Signal Beam into the Spectrometer.......................................................40

5.3 Optimizing the Time Center on the Instrument .................................................................................41

5.4 Troubleshooting.................................................................................................................................42

Chapter 6. Installing and Changing Hardware............................................................................................43

6.1 Changing the Crystal.........................................................................................................................43

6.2 Changing the Spectrometer ..............................................................................................................46

6.3 Installing a Reflective Fiber Collimator..............................................................................................47

Chapter 7. Retrieving Pulses ......................................................................................................................50

7.1 Optimizing Pulse Symmetry..............................................................................................................50

7.2 Centering the FROG Trace in time....................................................................................................50

7.3 Adjusting the Grid Size......................................................................................................................50

7.4 Setting the Background Level ...........................................................................................................50

Chapter 8. Warnings ...................................................................................................................................54

8.1 Spatial Chirp......................................................................................................................................54

8.2 Spectral Tilt........................................................................................................................................54

8.3 Pulse Front Tilt ..................................................................................................................................54

8.4 Wavelength Offset.............................................................................................................................54

8.5 Time Offset........................................................................................................................................54

8.6 FROG Trace Clipped.........................................................................................................................55

8.7 High Spatial Chirp..............................................................................................................................55

8.8 Background .......................................................................................................................................56

8.9 Software Warnings............................................................................................................................56

Chapter 9. Customization............................................................................................................................58

9.1 Data Pipes.........................................................................................................................................58

9.1.1 Using the data pipe.....................................................................................................................58

Chapter 10. Literature .................................................................................................................................59

Chapter 11. Appendices..............................................................................................................................60

Appendix A: Pinout for Analog and Digital I/O.........................................................................................60

Appendix B: File Formats of Saved Data ................................................................................................60

Appendix C: Function Reference for the PCGPMonitor DLL ..................................................................61

Appendix E: Calibration Sheets...............................................................................................................65

Chapter 1. Overview

09/07/2018 Vs 003 FROGSCAN USER’S MANUAL Page 1

Chapter 1. Overview

1.1 General Information

FROGscan is a high-performance ultrashort laser pulse measurement system that runs under

VideoFROGscan (VFS) laser pulse measurement software. It uses a unique combination of a high

performance servo delay line and a high performance, compact spectrometer. This combination provides

real-time performance and high dynamic range. FROGscan has the following features:

High speed, high accuracy servo delay line

Easy to align optical platform

USB interface

Compact spectrometer that is field replaceable

Small footprint

High performance VideoFROGscan software that fully controls the hardware and provides real-time

ultrafast laser pulse measurement.

Note: PC operating systems, software and hardware are constantly updating and changing. Every effort is

made to enable VideoFROGscan software to run well on a variety of computers and operating systems,

but even previously installed data acquisition devices may sometimes conflict with the frame grabbers

used in this product. Unfortunately, Mesa Photonics, LLC cannot guarantee that any particular brand or

model of Personal Computer will be compatible with any or all of the features or hardware contained in

the VideoFROGscan application, either now or in the future.

Windows,Windows 7, Windows 8, and Windows 10 are registered trademarks of Microsoft

Corporation.

Core Duo,i3,i5 and i7 are registered trademarks of Intel Corporation.

LabView is a registered trademark of National Instruments Corporation.

MATLAB is a registered trademark of MathWorks, Inc.

1.2 Safety Considerations

Optical radiation hazards

FROGscan does not present the operator with many safety hazards; however, this

instrument is intended for use with LASER systems. While the beam is well-contained

when FROGscan is properly aligned, use of this instrument may require the operator to

work in the optical path of the LASER itself where exposure to hazards may be sufficient

to warrant the use of protective equipment. Exposure hazards include reflected

radiation, for example, when the crystal is tuned for different wavelengths, as well as

radiation from the direct beam that may cause damage to the eyes and skin. When

working in an open beam path, it is advisable to operate the laser at eye-safe power

levels and to wear protective eye shields and clothing.

Electrical hazards

FROGscan utilizes only low voltages, derived from the USB bus in the host PC and the servo power

supply (+/- 15V); therefore, it poses little risk of electrical shock. FROGscan should always be operated

with its covers in place and in accordance with the manufacturer’s recommendations. The computer

connected to FROGscan should always be properly grounded. Additionally, ensure the power supply is

plugged into a grounded AC outlet with the supplied AC power cord. Failure to properly ground the power

supply may result in poor performance and is unsafe.

Chapter 1. Overview

Page 2 FROGSCAN USER’S MANUAL 09/07/2018 Vs 003

1.3 Specifications

Environmental

Operating temperature: +10° C to +40° C

Storage temperature: -30° C to +70° C

Humidity: 95% non-condensing

Operational

Computers vary widely in their characteristics and performance. The exact pulse retrieval rate depends

on many factors including the speed of the processor, the speed of the bus, the speed of the memory,

and the graphics card. Typically, FROGscan runs from about 1 to 4 Hz on modern Core Duo computers

running a Windows 7 or later operating system.

Instrument Specifications

Parameter

Specification

Input Pulse Wavelength Range

450 nm - >2000 nm

Pulse Length Range

< 15 fs - 12 ps

Temporal Range

30 ps

Temporal Resolution

2 fs or better

Delay Increment

1 fs

Spectral Resolution

0.20 nm - 1 nm

Spectral Range

100 nm - 600 nm

Pulse Complexity

TBWP > 50

Intensity Accuracy

Phase Accuracy

0.01 radians

Real-time Sensitivity (IpeakIave)

4 W2

Averaged Sensitivity (IpeakIave)

< 0.1 W2

Input Beam Size

2 - 8mm collimated

Nominal Polarization

Horizontal (vertical by rotating crystal)

Acquisition Speed

> 1 Hz 64 x 64 grid

Spectra required for measurement

Number in grid

FROGscan instruments are calibrated by the factory. Wavelength calibration is stored in the

spectrometer, and the temporal calibration is determined by the servo delay line. Typically, the delay line

is about 1 fs/step plus or minus a few percent. If you suspect that the temporal calibration is incorrect,

please contact the factory.

Chapter 1. Overview

09/07/2018 Vs 003 FROGSCAN USER’S MANUAL Page 3

1.4 FROGscan System Components and Beam Path

1= Entrance Iris

2= Center Iris

3= Beam Splitter

4= Servo Mirror

5= Focusing Mirror

6= Fixed Delay Mirror

7= Overlap Mirror

8= Exit Iris/Fixed Delay

Beam Camera

9= Focusing Mirror Camera

10= Diverter Mirror

11= 1st Turning Mirror

12= SHG Crystal

13= 2nd Turning Mirror

14= Lens + Iris

15= 3rd Turning Mirror

16= Spectrometer

Figure 1. Keyed image of the internal FROGscan Ultra component, including optional alignment cameras.

FROGscan Standard is not equipped with the Lens/Iris and 3rd Turning Mirror.

The LASER beam (red) enters through the Entrance Iris and is split into 2 parts by the Beam Splitter. The

Servo Beam (dark green) travels to the time delayed Servo Mirror and from there to the Focusing Mirror.

The Fixed Beam (light green) is reflected by the Fixed Delay Mirror. Part of the Fixed Beam travels

through the Overlap Mirror and from there to the Exit Iris (Fixed Delay Beam Camera in instruments with

the camera option). The other part is reflected by the Overlap Mirror and travels to the Focusing Mirror.

The Fixed Beam and the Servo Beam meet on the 1st Turning Mirror from where they are directed

through the SHG crystal to generate the Signal Beam (purple).

In FROGscan Ultra, the 2nd Turning Mirror directs the Signal Beam through the Lens/Iris, where the Servo

Beam, the Fixed Beam and their respective harmonics are shuttered out by the iris. The Lens focuses the

Signal Beam onto the 3rd Turning Mirror from where it enters into the Spectrometer. In FROGscan

Standard, the Servo Beam and the Fixed Beam travel to the 2nd Turning Mirror from where they are

directed to either side of the Spectrometer Aperture. Only the Signal Beam enters into the Spectrometer.

The Servo Beam (A) and the Fixed Beam (B) each generate a second harmonic (A*A and B*B) through

interaction with the nonlinear SHG crystal. The Signal Beam (A*B) is produced only when the Servo

Beam and the Fixed Beam overlap temporally and spatially in the crystal (see Figure 2 below).

Figure 2. Second Harmonics generated through

interaction with a nonlinear crystal. The fundamental

beams, A and B, pass through the crystal and

generate second harmonics (SHG) A*A and B*B.

The signal, A*B, is formed by mixing the two

fundamental beams. Depending on the wavelength

of the LASER and the type of crystal and

spectrometer used, both halves of the split LASER

beam, each of their harmonics, and the Signal Beam

can be seen on a fluorescing card.

Chapter 2. Setup

Page 4 FROGSCAN USER’S MANUAL 09/07/2018 Vs 003

Chapter 2. Setup

2.1 Inspecting the FROGscan Shipment Contents

Inspect the contents of the FROGscan box, which contains the following:

1. FROGscan Device.

2. Power Supply, Power Cable and Mini XLR Power Supply plug.

3. 2 USB Cables (for the Spectrometer and Servo Motor).

4. Tools: 5/64” Hex-L-Key, 4 mm Hex-L-Key (FROGscan Ultra), 3 mm Hex-L-Key (FROGscan

standard).

5. Computer (optional) with preloaded VideoFROGscan Software.

6. USB Flash drive with preloaded VideoFROGscan Software.

7. FROGscan Manual.

8. FROGscan Quick Setup Guide.

9. Calibration sheets and Warranty Information appended in the FROGscan Manual.

2.2 Setting up FROGscan

The servo motor and crystal have been secured for shipping and must be released before use.

PLEASE READ THESE INSTRUCTIONS CAREFULLY TO AVOID DAMAGE TO THE

INSTRUMENT

Always wear powder-free gloves when manipulating components within FROGscan.

1. Remove the anti-static covering from FROGscan and place the unit in the approximate desired

location on the optical table.

2. Open the FROGscan cover by twisting the two captive thumb screws on the base of the hinged

cover. Carefully lift the cover up until it remains in the upright position.

3. Remove the foam cushion from the beam block.

To free the servo:

4. CAREFULLY release the Servo Motor (see Figure 1 for the location of the Servo) by removing the

tape and the white REMOVE label along with the yellow tipped servo clip. Carefully place one

fingertip on top of the servo motor and verify that the Servo Stage moves freely.

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