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Kentech Instruments Ltd.
Pulse Chopper System
J99*****
10th. July 1999
PLEASE READ THIS MANUAL CAREFULLY BEFORE USING THE PULSER
Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K.
Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K.
10th. July 1999
1
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Summary of Contents for Kentech Instruments Pulse Chopper System
- Page 1 10th. July 1999 PLEASE READ THIS MANUAL CAREFULLY BEFORE USING THE PULSER Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K. Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K. 10th. July 1999...
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Page 2: Disclaimer
It is the responsibility of the user to exercise care and common sense with this highly versatile equipment. Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K. 10th. July 1999... -
Page 3: Table Of Contents
The gate off fall time. Figure 8 Testing for long term extinction. Figure 10 The gate off fall time is measured at 728ps Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K. 10th. July 1999... -
Page 4: Introduction
The pulser is designed for use with Pockels cells between polarisers and consequently the pulse amplitude can be varied to adjust the operating point. The greatest contrast will be achieved when the pulse amplitude at the cells Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K. 10th. July 1999... -
Page 5: Circuit Descriptions
Place one cell between the polarisers with the straight edge of the square aperture crystal at 45° to the plane of polarisation of the incoming light. Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K. 10th. July 1999... -
Page 6: Timing Adjustment
In addition as we are looking for transitions of the order of 700ps or less the separation of the cells in space will affect the required timing of each cell. Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K. 10th. July 1999... -
Page 7: Adjusting The Timing Of The Channels
Turn off and remove the power from the unit Remove the eight small cross point screws in the two sides of the unit. Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K. 10th. July 1999... - Page 8 4, outputs 3, 2 & 1 are progressively lower in this picture. Figure 4 Locating the timing adjusters Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K. 10th. July 1999...
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Page 9: Mounting The Cells
25 ohms but not so big that the cells take a significant time to charge. E.g 1MΩ. Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K. 10th. July 1999... - Page 10 Figure 5 Output pulse shape one of four channels 100 volts per division and 5ns per division Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K. 10th. July 1999...
- Page 11 The head connected for testing Figure 7 Gating off and looking for good extinction. Tested with a Kentech Gated Optical Imager with a 1ns gating module Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K. 10th. July 1999...
- Page 12 30ns Figure 9 The gate off fall time. Measured with a Kentech Gated Optical Imager fitted with a 100ps gating module Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K. 10th. July 1999...
- Page 13 Figure 10 The gate off fall time is measured at 728ps Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K. 10th. July 1999...
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