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\author{Sho Uemura}
\title{Laser test stand}
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\lhead{CLA cleanroom laser test stand\\Equipment owner: Tim Nelson}
\rhead{Author: Sho Uemura\\October 7, 2013}
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The laser test stand uses a pair of Class 3R laser sources with Class 1 fiber beam delivery to experimental equipment. 
If the requirements for operation are met, the system is designed to meet Class 1 safety limits.

\begin{figure}
	\centering
	\begin{subfigure}{.65\textwidth}
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		\includegraphics[width=\textwidth]{system}
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		\includegraphics[page=1,width=\textwidth]{labels}

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\paragraph{Laser sources}
Laser diodes are bonded at their outputs to fiber pigtails. 
The diodes can only be powered using the output modules listed. The fiber pigtails are tagged with the labels shown.

\begin{itemize}
	\item 840 nm laser diode: QPhotonics QFLD-840-2SM, nominal output power 2 mW, max output power 3 mW, Class 3R; output module AVX-S1-P3-SLAA
	\item 1060 nm laser diode: QPhotonics QFLD-1060-10S, nominal output power 10 mW, max output power 14 mW, Class 3R; output module AVX-S1-P4B
\end{itemize}

\paragraph{Laser pulse generator}

%AVTech Electrosystems AVO-9A-B-P-P3-SLAA with output modules AVX-S1-P3-SLAA (for the 840 nm diode) and AVX-S1-P4B (for the 1040 nm diode).
AVTech Electrosystems AVO-9A-B-P-P3-SLAA: maximum amplitude 10 V (200 mA into the 50 $\Omega$ impedances of the output modules) and maximum duty cycle 0.0025 (50 ns $\times$ 50 kHz).

\paragraph{Beam delivery}

The laser diodes are connected through adjustable fiber attenuators to the optical system (collimator, absorptive filter, and focusing lens) on the three-axis stage. 
The laser light is confined to a optical fiber or a light-tight lens tube up to the exit of the focusing lens. The stage is enclosed in a hutch.

\subsection*{Requirements for operation}
\begin{itemize}
	\item Laser operators for this system must review requirements for Class 2 and 3R systems in ESH Manual Chapter 10, Laser Safety (and are recommended to take the ESH132 class); see
	\begin{itemize}
		\item General Requirements: \url{http://www-group.slac.stanford.edu/esh/eshmanual/references/laserReqGeneral.pdf}
		\item Class 2 and Class 3R Laser Operation Requirements: \url{http://www-group.slac.stanford.edu/esh/eshmanual/references/laserReqClass2and3R.pdf}
	\end{itemize}
	%\item Operators are recommended to take the ESH132 class%: \url{https://www-internal.slac.stanford.edu/esh-db/training/slaconly/bin/catalog\_item.asp?course=132}.
	\item The output modules must only be powered by the AVTech pulser. The DC bias inputs to the output modules are shorted to ground (as recommended by AVTech when not applying bias). This guarantees the laser diodes operate within Class 1 limits.
	\item For unattended operation, the hutch should be closed.
\end{itemize}


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