Status of Laser Zentrum Hannover Laser Program Maik

Medium Power Stage fundamental mode output : 12 W opt = 42% , M

Medium Power Stage symmetric axis doubling output power by extension from V - to

High Power Stage - Setup ©LZH M. Frede Aug. 02 G 020326 -00 -Z

Modeling of the realized laser system ©LZH M. Frede Aug. 02 G 020326 -00

High Power Stage - first Results multimode Resonator ( M 2 < 7 ,

High Power Stage - first Results fundamental mode resonator ( M 2 < 1.

High Power Stage - Results • fundamental mode output power : 97 W •

Homogenized vs Non-Homogenized Pumping Scheme non - homogenized pump light distribution Increase of spherical

Pump light homogenization fiber arrangement fluorescence w/o homogenization fluorescence with homogenization ©LZH M. Frede

Fluorescence under assuming diode failure fiber arrangement fluorescence non-significant change in fluorescence distribution stable

Preparation of Wave front measurement • measure wave front distortion from optical components •

Outlook / Summary 200 W Advanced LIGO Laser single frequency P > 100 W

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Status of Laser Zentrum Hannover Laser Program Maik Frede Martina Brendel, Carsten Fallnich, Renê Gau, Philipp Huke, Ralf Wilhelm, Ivo Zawischa Laser Zentrum Hannover Aug. 2002 LSC Meeting-Hanford LIGO-G 020326 -00 -Z ©LZH M. Frede Aug. 02 G 020326 -00 -Z

Medium Power Stage fundamental mode output : 12 W opt = 42% , M 2 < 1. 2 ©LZH M. Frede Aug. 02 G 020326 -00 -Z

Medium Power Stage symmetric axis doubling output power by extension from V - to ring resonator ©LZH M. Frede Aug. 02 G 020326 -00 -Z

High Power Stage - Setup ©LZH M. Frede Aug. 02 G 020326 -00 -Z

Modeling of the realized laser system ©LZH M. Frede Aug. 02 G 020326 -00 -Z

High Power Stage - first Results multimode Resonator ( M 2 < 7 , OC = 12% ) ©LZH M. Frede Aug. 02 G 020326 -00 -Z

High Power Stage - Results • fundamental mode output power : 97 W • M 2 x, y : 1. 25 • optical efficiency : 25% • polarization ratio : > 200 • depolarization loss < 0, 5% • M 2 measurements with Beam Map, Data Ray Inc. output power and M 2 are limited by aberrations ! ©LZH M. Frede Aug. 02 G 020326 -00 -Z

Homogenized vs Non-Homogenized Pumping Scheme non - homogenized pump light distribution Increase of spherical aberrations through asymmetrical pump light distribution ©LZH M. Frede Aug. 02 G 020326 -00 -Z

Pump light homogenization fiber arrangement fluorescence w/o homogenization fluorescence with homogenization ©LZH M. Frede Aug. 02 G 020326 -00 -Z

Fluorescence under assuming diode failure fiber arrangement fluorescence non-significant change in fluorescence distribution stable laser conditions by holding pump power constant maintenance during laser operation possible ©LZH M. Frede Aug. 02 G 020326 -00 -Z

Preparation of Wave front measurement • measure wave front distortion from optical components • measure thermal lens and aberrations • data acquisition for theoretical model • optimize crystal cooling ©LZH M. Frede Aug. 02 G 020326 -00 -Z

Outlook / Summary 200 W Advanced LIGO Laser single frequency P > 100 W M 2 < 1. 1 laser modeling high power stage P = 97 W M 2 = 1. 25 wave front measurements and pump light homogenization ©LZH M. Frede Aug. 02 G 020326 -00 -Z