AMOS-Streak Camera

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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: Prof. Bryce Richards, Ian Howard

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

Access: 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. position (or wavelength) information. Since the streak camera is a two dimensional device, it can be used to detect several tens of different light channels simultaneously. For example, used in combination with a spectroscope, time variation of the incident light intensity with respect to wavelength can be measured (time resolved spectroscopy). Used in combination with proper optics, it is possible to measure time variation of the incident light with respect to position (time and space-resolved measurement)

Currently the setup in the lab can be used in two configurations:

a) synchroscan (< 5 ns)

b) using an external delay unit

Start-up Procedure and Measurement

1.Ensure there is enough water in the chiller. Turn on the chiller. First the mains, and then the button on the chiller. Make sure that the indicator displays green.

2.Mount the sample in the sample holder.

3.Make sure that the photo cathode is at zero position.

4.Depending on the configuration used, turn on the respective delay unit, pulse picker and make sure that they are properly connected and configured.

5.Switch on the computer.

6.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.

7.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:- TiSa output, SHG, OPO, SHG of OPO etc.

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

9.Set the frequency for the pulse picker if required.

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

12.Wear your eye protection gear. Then turn the shutter ON by pressing the shutter button. Also turn ON the required output from the OPO.

13.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.

14.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.

15.You will be able to see a streak on the live video output.

16.Set the appropriate timescale, gain and delay(if required) in the control palette.

17.In the software control palette, change the Streak Camera Mode from 'Focus' to 'Operate'. Click auto-scale in the live video window.

18.Adjust the timescale, gain and photocathode opening for the optimal measurement.

19.Set the required integration time and save the image and data. 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