Re: OPA695 current feedback amplifier

From: John Larkin (jjlarkin_at_highSNIPlandTHIStechPLEASEnology.com)
Date: 09/24/04 

Date: Fri, 24 Sep 2004 10:23:47 -0700

On Fri, 24 Sep 2004 18:56:21 +0200, Rene Tschaggelar <none@none.net>
wrote:

>Phil Hobbs wrote:
>>
>> No, it's 1 mW peak--I'm just sticking a single mode fibre behind a ND
>> 2.5 filter, right in the unfocused beam. The actual laser peak laser
>> power is more like 10 MW. Fibre optics works great when your optical
>> pulses are only a quarter of an inch long.
>>
>> My rep rate is only 20 Hz, and the flashlamp jitter is probably hundreds
>> of nanoseconds, so I have to synchronize on each pulse separately.
>>
>> The MAR-3 has a low, resistive input impedance, and the photocurrent
>> pulse is unipolar and has a very low duty cycle, so the net effect is
>> very nearly identical to capacitive coupling (within 1 part in 10**10).
>> Adding additional components on the input would just have added stray
>> capacitive loading without changing anything.
>
>Interesting that you get some signal at all from 1mWpk.
>And with a straight input to a MAR3
>
>Rene

1 mW is a huge optical signal! It will get you 0.5 mA or better from
most any pin diode.

John

Quantcast