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Gating of Optical Multichannel Analysers with Krytron Switches

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  • 530 Physik

Abstract

Gating of optical multichannel analysers with krytron switches J Biebl and A Penzkofer F a k u l t ä t fü r P h y s i k der U n i v e r s i t ä t Regensburg , 8400 Regensburg , G e r m a n y Received 5 March 1980 Abstract A k r y t r o n pulse generator is used to gate a n op t i ca l mu l t i channe l analyser. T h e pulse generator c i rcu i t is descr ibed a n d the performance o f gat ing is analysed. 1 Introduction O p t i c a l mu l t i channe l analysers consis t ing o f a detector a r ray a n d a s ignal process ing console have p r o v e d to be power fu l detect ion systems. T h e gat ing o f the detector heads facilitates their use i n studies w i t h p icosecond a n d nanosecond l ight signals due to r educ t ion o f b a c k g r o u n d l ight ( D ö r r et al 1976, Oster tag 1977). R a t h e r expensive gat ing pulse generators are offered by the manufacturers o f op t i ca l mu l t i channe l analysers (e.g. m o d e l P A R C 1211 b y P r i n c t o n A p p l i e d Resea rch a n d m o d e l B M 5800 b y B & M Spectronic) . H e r e we describe a n inexpensive k r y t r o n pulse generator a n d analyse its ga t ing performance. 2 Description of krytron pulse generator T h e op t i ca l mu l t i channe l analyser O S A 500 (B & M Spec- t ronic) used i n ou r experiments needs a negative h i g h vol tage pulse for gat ing. A k r y t r o n system is bu i l t -up to generate the requ i red pulses. F i g u r e 1 depicts the c i rcu i t o f the k r y t r o n system. It consists o f four parts, the trigger sect ion, the avalanche t ransis tor cha in , the k r y t r o n tube a n d the output pulse stage ( L e y et al 1970, H y e r et al 1975, C u n i n et al 1977). T h e trigger t ransis tor Qi is swi tched b y a posi t ive vol tage s ignal o f 1-5 V (dura t ion > 5 n s ) to 5 V (dura t ion ~ 0 - 5 n s ) . T h e co l lec to r -emi t te r vol tage o f t ransistor ß i is regulated near to its b r e a k d o w n voltage ( £ ; 2 0 0 V ) w i t h resist

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