AMOS-Streak Camera

250px|thumb|right|IMG 1. LASER Lab

The purpose of these instructions is to give you a quick overview on how to work with the devices. You should still be familiar with the manual and receive a proper introduction from the lab leader or the principal users.

Device location: Optiklabor F&E4-3GP

Lab location: Building 310 Basement Room no. 054

Phone number: N.A.

Lab leader: Ian Howard

Principal users: Andrey Turshatov, Dmitry Busko, Michael Adams, Michael Oldenburg, Vu-Hong Le, Nicolo Baroni

Access: The setup is in a class IV laser lab. Only trained users with key may use the setup. The Lab is located in the basement of building 310. Open the door of the basement of B310, go straight ahead and open another door. The new LASER Lab can be found on your left side.

Short Description

The streak camera is a device to measure ultra-fast light phenomena and delivers intensity vs. time vs. wavelength information.

Currently the streak camera in the lab can be used in two configurations:

• synchroscan (< 5 ns)

200px|thumb|right|Streak camera with Synchroscan Unit

• slow single sweep unit

200px|thumb|right|Streak camera with Slow Single Sweep Unit

Start-up Procedure and Measurement

Turning the LASER ON

1. Turn ON the tablet for controlling the output of the CHAMELEON COMPACT OPO-VIS System with Idler. It has options for different types of output. eg:- Ti:Sa output, SHG, OPO, SHG of OPO etc.

250px|thumb|right|IMG. 3. Tablet for LASER system

1. Ensure that the shutter is closed and the cooling units for the LASER are switched ON.

250px|thumb|right|IMG.4. LASER Control

1. Turn the LASER key to ON position, and wait till the LASER ramps up enough power. Ideally at 800nm the power should be 4W. Set the required wavelength for the Ti:Sa LASER.
2. To start LASER emission, press the Shutter button. (A green LED indicates that the shutter is open)

Delivering beam to the sample

250px|thumb|right|Front View of Chameleon compact OPO-VIS system with Idler

1. Mount the sample in the sample holder.
2. Select the type of output required from the CHAMELEON using the tablet.
3. Carefully set up the beam path using mirrors, irises and lenses so that the LASER light is incident on the sample.

Delivering beam to sample through pulse picker

1. Mount the sample in the sample holder.
2. Select the the type of output required from the CHAMELEON using the tablet.

Setting up the Streak Camera

1. Ensure there is enough water in the chiller. To turn on the chiller, first press the black switches on both units, and then the display on the top unit shows OFF. Give a long press on the OK button and the display will show the coolant temperature. See IMG.5.
2. Make sure that the slit before the streak camera is set to zero (fully closed). See IMG. 6.

100px|thumb|right|IMG. 6. Micrometer to control the slit-opening of the streak camera

1. Switch on the computer.
2. Turn on the streak camera and also the software on the computer by Hamamatsu. In the software, open live video and click auto-scale. A green streak will be visible at the center, this is because the cooling is not yet turned ON in the software. Turn Cooling ON in the palette on the left and you can see the streak vanishing.
3. Depending on the configuration used, turn on the respective delay unit, pulse picker and make sure that they are properly connected and configured.The different modes are described below. XXXX describe these configurations and connections, add diagrams and pictures XXX

Synchroscan Mode

Turn OFF the lights in the lab as the streak camera measurements are sensitive

Single sweep Mode

Turn OFF the lights in the lab as the streak camera measurements are sensitive

Single Sweep Gated Mode

200px|thumb|right|Function generator for external triggering in gated mode and the Pulse Picker Control system Turn OFF the lights in the lab as the streak camera measurements are sensitive

Measurement

1. Make sure the alignment is correct and that the correct filters are mounted so that only the light to be measured is entering the streak camera. XXX how? XXX some pictures
2. Start opening up gap for the photocathode slowly by turning the attached micrometer screw. Make sure this is done very slowly and the gap should ideally not exceed 20mm.
3. You will be able to see a streak on the live video output. XXX add some screenshots XXX
4. Set the appropriate timescale, gain and delay(if required) in the control palette.
5. In the software control palette, change the Streak Camera Mode from 'Focus' to 'Operate'. Click auto-scale in the live video window.
6. Adjust the timescale, gain and photocathode opening for the optimal measurement.
7. Set the required integration time and save the image and data.
8. In case the detected light is very weak, you will have to use photon counting mode and save the image after setting a threshold value for detecting a hit per pixel.

Shutdown Procedure

1. Make sure you have saved all the data required.
2. Close the photocathode opening.
3. Turn OFF the software and the streak camera.
4. Turn ON the lights
5. Turn OFF the output of the CHAMELEON COMPACT OPO-VIS using the tablet.
6. Turn the shutter OFF.
7. Turn Ti:Sa LASER key to Standby.
8. Turn OFF the delay generator and pulse picker(if used)
9. Turn OFF the computer and chiller.

Kategorie:Geräte - Devices Kategorie:Prüfmittel - Measuring Equipment Kategorie:F&E4 Kategorie:AMOS