tobin

% Matlab code to plot a cavity resonance

F = 10; % Finesse

f = linspace(-0.5, 1.5, 201);
P = 1./(1 + (2/pi) * F^2 * sin(pi*f).^2);

plot(f, P);
xlabel('free spectral ranges');
ylabel('power buildup');

tobin

This Mathematica notebook shows some properties of 1d Hermite Gauss modes:

* They are orthonormal
* What happens when the 0-mode and a higher-order mode are incident on a split photodiode?
* A displaced 0-mode can be written as a sum of higher order modes

Tobin Fricke
2013-01-25

tobin

# This script prints out a list of the TITLES of all posts on a Tumblr blog
#
# TF 2013-01-16


import requests
import sys

if len(sys.argv) != 2:
    print "Usage: " + sys.argv[0] + " blog_name.tumblr.com"

tobin

function P = uniqueperms(varargin)

% This function allows two possible calling formats:
% perms_nodupes(syms)
% perms_nodupes(syms,counts)
%
% Here perms_nodupes returns all permutations of the vector SYMS.
% COUNTS is an optional vector indicating how many times each symbol should
% be included.  The following are equivalent:
%

tobin

This diagram gives an overview of the Table-Top Frequency Stabilization Servo (TTFSS).

Nice overview wiki:
https://awiki.ligo-wa.caltech.edu/aLIGO/TTFSS

tobin

%% Numerical quantum mechanics (one-dimensional)
% This little program solves the eigenstate problem H|Psi> = E|Psi>
% numerically for an arbitrary hamiltonian H.  Just plug in your potential
% V and seconds later take a peek at the eigenstates and eigenvalues.  I'm
% sure all of this could be done in smarter ways, but I like that all the
% machinery is exposed.  The only matlab trickery we use is
% matrix multiplication.
%
% Tobin Fricke <tfricke@ligo.caltech.edu>
% 2009-02-12

tobin

%% Frequency response of a boxcar filter
%
% A look at the frequency response of sample-and-hold.
%
% Tobin Fricke 2012-10-18

Fs = 2^16;           % Higher sample rate
R = 32;              % upsampling factor
N = 1 * Fs;          % number of sample data to generate

tobin

/*  It turns out that the environment pointer is passed to main()
    as the third argument -- I had no idea!  The usual way to get
    the environment is via an "extern char **environ;" declaration. 

    This program prints out the environment in KEY=VALUE format,
    one variable per line.
*/

#include <stdio.h>

tobin

           0          101
 1.52588e-05          100
 3.05176e-05          100
 4.57764e-05           99
 6.10352e-05           99
7.6294004e-05           98
 9.15528e-05           96
0.0001068116           95
0.0001220704          127
0.0001373292           92

tobin

all: xor-c xor-cpp xor-cpp-noflush rand 

test: xor-c xor-cpp xor-cpp-noflush
	time ./xor-c < rand.txt
	time ./xor-cpp < rand.txt
	time ./xor-cpp-noflush < rand.txt

rand: rand.c
	gcc -Wall rand.c -o rand