Onverters, Figure 12: uv converter diagram – Gentec-EO Accessories for Beam Diagnostics User Manual
Page 19
Accessories for Beam Diagnostics
Revision 1.2
19
4.3. UV CONVERTERS
UV converters take advantage of a phenomenon called fluorescence to extend the wavelength range of the
Beamage-3.0 to the UV wavelengths. The fluorescent crystal is located at the entrance of the converter. It
absorbs UV wavelengths and reemits longer wavelengths (visible spectrum), which are less energetic. The rest of
the device is mainly composed of optics. An iris at the end controls the exposure on the sensing device.
The light emitted from the fluorescent crystal is non-coherent and non-collimated. The multiple lenses inside the
converter compensating for this affect the beam size. Therefore, it is important to know that UV Converters have
magnification properties, which are detailed in tables 9 and 10.
Like an IR adaptor, a UV converter is an extension tube that is simply fixed onto the aperture of the camera.
Figure 12: UV Converter Diagram
Table 10: UV Converters Specifications (12 mm aperture)
Model
BF12C12N
BF12C23N
BF12G12N
BF12G23N
BF12P12N
BF12P23N
BF12R12N
BF12R23N
Input Aperture Ø [mm]
12
12
12
12
12
12
12
12
Closest Standard Optical
Camera Format
1/2"
2/3"
1/2"
2/3"
1/2"
2/3"
1/2"
2/3"
Main Tube Length (L) [mm]
60
60
60
60
60
60
60
60
Extension Tube Length (D)
[mm]
24.3
29.2
24.3
29.2
24.3
29.2
24.3
29.2
Overall Length (OAL) [mm]
102.8
109.7
102.8
109.7
102.8
109.7
102.8
109.7
Max Input Beam Size [mm]
7,2 x 9,6
7,2 x 9,6
7,2 x 9,6
7,2 x 9,6
7,2 x 9,6
7,2 x 9,6
7,2 x 9,6
7,2 x 9,6
Max Beam Size on CMOS [mm]
4,2 x 5,6
6,0 x 8,0
4,2 x 5,6
6,0 x 8,0
4,2 x 5,6
6,0 x 8,0
4,2 x 5,6
6,0 x 8,0
Magnification
1.7
1.2
1.7
1.2
1.7
1.2
1.7
1.2
Crystal Type
C
C
G
G
P
P
R
R
Wavelength Range [nm]
110 - 225
110 - 225
X-ray - 400
X-ray - 400
110 - 350
110 - 350
110 - 535
110 - 535
Relative Response
193 nm
22
22
480
480
48
48
100
100
248 nm
0.17
0.17
480
480
15
15
8
8
308 nm
0.03
0.03
112
112
1
1
0.18
0.18
Saturation Level
[mJ/cm
2
]
193 nm
400
400
10
10
30
30
50
50
248 nm
N/A
N/A
10
10
30
30
400
400
308 nm
N/A
N/A
50
50
50
50
400
400
Damage Threshold [mJ/cm
2
]
500
500
250
250
500
500
500
500
Max Average Power [W/cm
2
]
2
2
2
2
2
2
2
2
Decay Time [μs]
3 - 5
3 - 5
0.5
0.5
5
5
3000
3000
Max Repetition Rate
30 - 20 kHz
30 - 20 kHz
200 kHz
200 kHz
20 kHz
20 kHz
30 Hz
30 Hz
Part Number
202314
202315
202316
202317
202318
202319
202320
202323