This calculator will help you computes the round trip time and repetition frequency of a pulsed laser cavity.



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$C$=3x10$^8$

$OPL$=2L$_1$n$_{g^1}$+2L$_2$n$_{g^2}$+L$_3$n$_{g^3}$+L$_4$n$_{g^4}$

$\tau$ = $\frac{OPL}{C}$

$f_{rep}$= $\frac{1}{\tau}$

Material 1 (or2) length with double pass, L$_1$ (L$_2$);

Material 3 (or4) length with single pass, L$_3$ (L$_4$);

Material 1 (2,3,4) group index, $n_{g^1} (n_{g^2} n_{g^3} n_{g^4})$;

Round Trip Time, $\tau$    Repetition Frequency, f$_{rep}$

Input
$L_1$:
m
$L_2$:
m
$L_3$:
m
$L_4$:
m
$n_{g^1}$:
$n_{g^2}$
$n_{g^3}$
$n_{g^4}$



Output
Round Trip Time, $\tau$:
ns
Repetition Frequency, f$_{rep}$:
MHz