Transcript
Nd:YVO4 Amplifier System Bastian Schulz, Maik Frede, Ralf Wilhelm, and Dietmar Kracht
Laser Zentrum Hannover Frank Seifert, Patrick Kwee and Benno Willke
AEI LSC March 06 G060113-00-Z
Outline • Single Amplifier stage design • Amplifier Setup with 2 stages • 4 Amplifier stages • Summary and Outlook
Single amplifier stage design •
Gain medium: 3x3x10 mm3 Nd:YVO 4 8 mm 0.3 % dop. 2 mm undoped end cap naturally birefringent
•
Pumpdiodes: fiber-coupled 808 nm, 45 W 400 µm fiber diameter NA=0,22
Amplifier Setup with 2 stages Master Laser: 2 W NPRO (Innolight Mephisto) 600 µm pumpspot diameter in first crystal 800 µm in second crystal
Amplification with 2 stages 17 16
2 W NPRO
41 W Pump power per stage
16
12
Output Power (W)
Output power (W)
14
10 8 6 4
15 14 13 12
2 0 0,0 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 1,8 2,0 2,2
Input power (W)
11 28
30
32
34
36
38
40
42
Pump Power per stage (W)
2 W NPRO amplified to 15,7 W
44
46
Beamquality of 2 staged Amplifier Beamprofile and M 2Measurement 1,8
Premode-Cleaner measurement
M² < 1.1
Scan 20 x enlarged
1,0
Normalized power (a.u.)
1,6 1,4
w0 (mm)
1,2 1,0 0,8 0,6 0,4
0,6 0,4 0,2 0,0
0,2 0,0 -50
0,8
0
50
100
150
200
d (mm)
250
300
350
-0,2
0,0
0,2
0,4
0,6
0,8
1,0
1,2
1,4
Free spectral range
Power in fundamental mode >97%
4 Amplifier Stages • 2 W NPRO • 40 W Pump Power / stage • 32 W Output power – M2 < 1,1 – 95% power in fundamental • Maximum output power 35 W
4 Amplifier Stages
Intensity Noise of Unstabilized Amplifier System Amplifier NPRO -4
RIN (Hz-1/2)
10
-5
10
-6
10
-7
10
10
0
10
1
10
2
3
10
f (Hz)
10
4
10
5
Input Power Variation of 4 staged Amplifier System 40 4 stages
35
Output Power (W)
30 25 20 15 10 5 0 0,0 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 1,8 2,0
Input Power (W)
Summary and Outlook • End-pumped cascadable amplifier system • Amplification of a 2 W NPRO: – 2 stages amplified to 15.7 W with 97% power in fundamental mode – with 4 stages to 32 W with 95% power in fundamental mode
• Possible laser source for LIGO+
Thank you for your attention !
