Specification TutorialOptomechanics · 2014. 5. 2. · n Optical Density: 180 - 532 nm OD7+...
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www.thorlabs.com 453 CHAPTERS Tables/ Breadboards Mechanics Optomechanic Devices Kits Lab Supplies SECTIONS Optics Supplies Fiber Supplies Electrical Components Lab Tools Safety and Blackout Screws, Nuts, and Bolts 19" Rack Hardware Storage Optomechanics t t t t Laser Mode Designation The scale number (Ln) specified is intended to be used in conjunction with the wavelength range and the laser mode designation in order to determine if the laser safety glasses meets the minimum required level of protection for a given laser (see the table to the right). If one component of the L-Rating is shared, a plus sign is used to separate multiple wavelength ranges or laser modes and scale numbers in order to save space. In addition, a greater than (>) sign preceding a wavelength range indicates that the mode and scale number ratings for that wavelength range are valid for wavelengths of light greater than the bottom number in the range up to and including the top number in the range. For example, if the glasses were rated as 330 - 370 D L2 and >370 - 500 D L3 then at 370 nm the rating would be D L2 and for all wavelengths greater than 370 nm up to and including 500 nm would be rated at D L3. Specification Tutorial Optical Density = Log 10 (1/T) or T = 10 -OD Laser Safety Glasses (Page 1 of 5) LASER MODE ENGRAVED SYMBOL PULSE DURATION Continous Wave (CW) D >0.25 s Pulsed Mode I >1 μs - 0.25 s Giant Pulsed Mode R 1 ns - 1 μs Mode Locked M <1 ns Please refer to the official EN 207 standard that can be purchased from BSI. WAVELENGTH LASER MODE MAXIMUM POWER DENSITY (P) or MAXIMUM ENERGY DENSITY (E)* MINIMUM SCALE NUMBER (Ln) 180 - 315 nm D 1 x 10 n-3 W/m 2 log 10 (P)+3 I and R 3 x 10 n+1 J/m 2 log 10 (E/3)-1 M 1 x 10 n+10 W/m 2 log 10 (P)-10 315 - 1400 nm D 1 x 10 n+1 W/m 2 log 10 (P)-1 I and R 5 x 10 n-3 J/m 2 log 10 (E/5)+3 M 1.5 x 10 n-4 J/m 2 log 10 (E/1.5)+4 1400 - 1000000 nm D 1 x 10 n+3 W/m 2 log 10 (P)-3 I and R 1 x 10 n+2 J/m 2 log 10 (E)-2 M 1 x 10 n+11 W/m 2 log 10 (P)-11 Please refer to the official EN 207 standard that can be purchased from BSI. This guide is not intended as a substitution for reading and understanding the ANSI Z136, EN 207, or EN 208 Laser Safety Standards. It is only meant to provide an introductory overview tounderstanding the markings on the lenses of the LG series of laser glasses. Indelibly printed on the laser safety glasses are two sets of numbers: Optical Density (OD) and L-Rating, which are both used to indicate the level of protection provided for specific wavelength ranges. The OD numbers printed on the laser safety glasses can be used to determine if the glasses meet the ANSI Z136 standards of laser safety protection for a given laser product. In addition, the OD can be used to calculate the transmittance (T) of light through the laser safety glasses: The European EN 207 standard for laser safety glasses requires that the protective eyewear be labeled with the CE mark and that the L-Rating specifications are indelibly printed on the lens. In addition, the lenses and frames must be able to provide the stated level of protection for 10 seconds or 100 pulses depending on the mode of the laser. The L-Rating is composed of 3 components: a wavelength range, a laser mode designation, and a scale number. The wavelength range engraved on the laser safety glasses is given in nanometers and is extremely important since the level of protection provided by the laser safety glasses is wavelength dependent. The laser mode designation is based on the duration of the pulse emitted by the laser. European Norm for the Selection of Laser Safety Glasses There are two ways to use the table above: start with the scale number and calculate the maximum safe power density or start with a power density and calculate the minimum safe scale number. This is demonstrated by the two examples below. Example 1: The LG3 laser safety glasses have an L-Rating line that reads “180 - 315 D L7 + IR LB4”. So if the LG3 glasses are being used with a 10 μs pulsed 280 nm light source, the table above can be referenced to find that E = 3 x 10 n+1 J/m 2 , where the scale number in this example is LB4 so n = 4. As a result, when the LG3 laser safety glasses are being used in this situation, the maximum power density of the light source should not exceed 3 x 10 5 J/m 2 . Example 2: A CW Krypton Ion laser lasing at 647.1 nm has a maximum power density of 2.2 x 10 4 W/m 2 . Using the table above, the scale number can be calculated using Ln = log 10 (P)-1, which results in a rounded up scale number of 4. The LG4 laser safety glasses meet the safety specifications of the European EN 207 standard for this example. *n in these equations is equivalent to Ln and represents the scale number.
Transcript of Specification TutorialOptomechanics · 2014. 5. 2. · n Optical Density: 180 - 532 nm OD7+...
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Tables/ Breadboards
Mechanics
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Kits
Lab Supplies
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Screws, Nuts, and Bolts
19" Rack Hardware
Storage
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Laser Mode DesignationThe scale number (Ln) specified is intended to be used in conjunction with the wavelength range and the laser mode designation in order to determine if the laser safety glasses meets the minimum required level of protection for a given laser (see the table to the right). If one component of the L-Rating is shared, a plus sign is used to separate multiple wavelength ranges or laser modes and scale numbers in order to save space. In addition, a greater than (>) sign preceding a wavelength range indicates that the mode and scale number ratings for that wavelength range are valid for wavelengths of light greater than the bottom number in the range up to and including the top number in the range. For example, if the glasses were rated as 330 - 370 D L2 and >370 - 500 D L3 then at 370 nm the rating would be D L2 and for all wavelengths greater than 370 nm up to and including 500 nm would be rated at D L3.
Specification Tutorial
Optical Density = Log10 (1/T) or T = 10-OD
Laser Safety Glasses (Page 1 of 5)
LASER MODE ENGRAVED SYMBOL PULSE DURATION
Continous Wave (CW) D >0.25 s
Pulsed Mode I >1 µs - 0.25 s
Giant Pulsed Mode R 1 ns - 1 µs
Mode Locked M
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Wavelength (nm)
OD
Laser Glasses (Page 2 of 5)
LG2
n Green Lens: 19% VLTn Optical Density: 180 - 450 nm OD6+, 770 - 1800 nm OD2+,
820 - 1720 nm OD3+, 870 - 1600 nm OD4+, 940 - 1070 nm OD5+n L-Rating:* 180 - 315 D LB6 + R LB4, >315 - 400 DR LB4, >770
- 820 DIR LB2, >820 - 865 DIR LB3, >865 - 940 DIR LB4, >940 - 1064 DIRM LB5, >1064 - 1400 DIRM LB4, >1400 - 1850 DI LB2
CERTIFIED
ITEM # $ £ € RMBLG2 $ 179.50 £ 129.24 € 156,17 ¥ 1,430.62
LG1
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OD
n Green Lens: 59% Visible Light Transmission (VLT)n Optical Density: 190 - 400 nm OD5+, 808 - 840 nm OD4+,
>840 - 950 nm OD5+, >950 - 1080 nm OD7+, >1080 - 1090 nm OD5+n L-Rating:* 808 - 840 DIRM LB4, >840 - 950 + >1080 - 1090 DIRM
LB5, >950 - 1080 D LB6 + IRM LB7
CERTIFIED
All graphics represent nominal filter characteristics.
ITEM # $ £ € RMBLG1 $ 169.30 £ 121.90 € 147,29 ¥ 1,349.32
Alignment Rating (EN 208)The LG13 and LG14 glasses are rated for laser alignment applications. This rating allows the lens to transmit a portion of the light for alignment purposes, while attenuating the light to eye-safe power levels in the event of accidental direct exposure to a beam. The rating is given as RB# where # is replaced by the minimum optical density at the specified wavelength or wavelength range (in nm). Along with this RB value is the maximum allowable power and energy of the laser over a Ø7 mm aperture. Power is given for pulses greater than 0.2 ms, while energy is specified for pulses from 1 ns to 0.2 ms. When using a pulsed laser, a correction factor of N1/4 must be multiplied by the maximum energy rating, replacing N with the number of pulses the laser produces in a 10 s interval.
Example: The LG14 laser safety glasses have an alignment rating of 1 W 2 x 10-4 J 532 RB3. At 532 nm, the glasses will have an optical density between 3 and 4, correlating to transmission between 0.1% and 0.01%. The maximum power over a Ø7 mm aperture that these glasses can be used with at 532 nm is 1 W, or an energy of 2 x 10-4 J.
OverviewThorlabs offers a variety of laser safety glasses for protection in the 180 nm to 11µm range. These laser glasses are available in a comfortable frame style to avoid any inconvenience to the user in a lab environment. Every pair of Thorlabs’ laser glasses is certified. The certification mark, along with the wavelength ranges and their respective ratings, are indelibly printed on the glasses. See www.thorlabs.com for more information on the CE certification and ratings.
n Top and Side Shield Protectionn A Variety of Laser Glasses that Protect from 180 nm to 11 µmn Comfortable Frame Style can be used Over Prescription Glassesn All Laser Glasses are CE Certified and EN207 Compliantn Storage Case Included
Do you need a...
Laser Viewing Card
See page XXX
*Wavelength ranges given in nm
*Wavelength ranges given in nm
Specs Updated9-20-13 - LF
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LG5
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Wavelength (nm)
ODn Pink Lens: 61% VLT
n Optical Density: 180 - 390 nm OD6+, 785 - 830 nm OD5+, 800 - 818 nm OD6+
n L-Rating:* 180 - 315 D LB6 + R LB4, >315 - 390 D LB4 + R LB6, 785 - 800 + >818 - 830 D LB4 + I LB5, >800 - 818 DR LB5 + IM LB6, 10600 DI LB2
CERTIFIED
Laser Glasses (Page 3 of 5)
LG6
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Wavelength (nm)
OD
n Clear Lens: 93% VLTn Optical Density: 190 - 398 nm OD7+, 9 - 11 µm OD7+n L-Rating:* 190 - 315 D LB7 + IR LB4, >315 - 398 DIRM LB5,
9000 - 11000 DI LB3
CERTIFIED
All graphics represent nominal filter characteristics.
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LG4
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OD
n Blue Lens: 12% VLTn Optical Density: 190 - 400 nm OD5+, 625 - 850 nm OD4+,
633 nm OD5+, 662 - 835 nm OD5+n L-Rating:* 180 - 315 D LB7 + R LB3, >315 - 395 D LB5 + R LB6,
>830 - 850 DIR LB3, 625 - 830 DR LB4, 625 - 670 + >800 - 830 I LB4, >670 - 800 I LB5
CERTIFIED
LG3
n Orange Lens: 48% VLTn Optical Density: 180 - 532 nm OD7+n L-Rating:* 180 - 315 D LB7 + IR LB4, >315 -532 DIRM LB6
CERTIFIED
ITEM # $ £ € RMB LG3 $ 147.90 £ 106.49 € 128,67 ¥ 1,178.76
ITEM # $ £ € RMB LG5 $ 169.30 £ 121.90 € 147,29 ¥ 1,349.32
*Wavelength ranges given in nm
*Wavelength ranges given in nm
*Wavelength ranges given in nm
*Wavelength ranges given in nm
ITEM # $ £ € RMB LG6 $ 147.90 £ 106.49 € 128,67 ¥ 1,178.76
ITEM # $ £ € RMB LG4 $ 158.10 £ 113.83 € 137,55 ¥ 1,260.06
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LG10
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OD
n Amber Lens: 35%VLT n Optical Density:190 - 534 nm OD7+, 850 - 925 nm OD5+,
925 -1070 nm OD6+, 960 - 1064 nm OD7+n L-Rating:* 180 - 315 D LB7 + R LB4, >315 - 534 D LB5 + IRM LB6,
850 - 925 + >1064 - 1085 DIRM LB5, >925 - 980 D LB5 + IRM LB6, >980 - 1064 D LB6 + IRM LB7
ITEM # $ £ € RMBLG10 $ 190.70 £ 137.30 € 165,91 ¥ 1,519.88
Laser Glasses (Page 4 of 5) All graphics represent nominal filter characteristics.
LG9
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Wavelength (nm)
OD
n Brown Lens: 25% VLTn Optical Density: 180 - 400 nm OD6+, 720 - 1090 nm OD5+,
750 - 1064 nm OD7+n L-Rating:* 180 - 315 D LB6 + R LB4, >315 - 400 DR LB4,
720 - 725 DM LB5, 720 - 750 + >1064 - 1075 IR LB5, >725 - 1075 DM LB6, >750 - 1064 IRM LB7
CERTIFIED
LG8
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OD
n Green Lens: 35% VLTn Optical Density: 190 - 400 nm OD5+, 670 - 695 nm OD3+,
815 - 1050 nm OD3+, 1050 - 1080 nm OD2+n L-Rating:* 670 - 690 + 820 - 1050 DIR LB3, 665 - 690 - 698
DIR LB2, 790 - 1050 - 1080 DIR LB2
CERTIFIED
ITEM # $ £ € RMBLG8 $ 205.00 £ 147.60 € 178,35 ¥ 1,633.85
LG7
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OD
n Teal Lens: 35% VLT n Optical Density: 190 - 400 nm OD6+, 615 - 720 nm OD3+,
651 - 670 nm OD4+, 671 - 715 nm OD5+, 680 - 710 nm OD6+, 690 - 700 nm OD7+
n L-Rating:* 180 - 315 D LB6 + R LB4, >315 - 400 DR LB4, >615 - 660 DIR LB3, >660 - 665 DIR LB4, >665 - 715 D LB4 + IR LB5, 694 IR LB7
CERTIFIED
CERTIFIED
*Wavelength ranges given in nm
*Wavelength ranges given in nm
*Wavelength ranges given in nm
*Wavelength ranges given in nm
ITEM # $ £ € RMB LG7 $ 205.00 £ 147.60 € 178,35 ¥ 1,633.85
ITEM # $ £ € RMB LG9 $ 190.70 £ 137.30 € 165,91 ¥ 1,519.88
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Screws, Nuts, and Bolts
19" Rack Hardware
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n Brown Lens: 11% VLT n Optical Density: 180 - 534 nm OD7+, 720 - 730 nm OD5+,
>730 - 740 nm OD6+, >740 - 1070 nm OD7+n L-Rating:* 180 - 315 D LB7 + R LB4, >315 - 534 + 730 - 740 D LB5
+ IRM LB6, >740 - 1070 D LB6 + IRM LB7
CERTIFIED
LG11
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n Green Lens: 75% VLTn Optical Density: 850 - 5200 nm OD3+, 945 - 2300 nm OD5+,
1010 - 1500 nm OD7+, 2300 - 2500 nm OD4+, 2800 nm - 10.6 µm OD5+n L-Rating:* 950 - 1000 DIR LB5, >1000 - 1063 DIR LB6, >1063 - 1400 D
LB6 + IR LB7, >1400 - 2500 DIR LB4, 2900 - 3200 + 10600 DI LB4
CERTIFIED
ITEM # $ £ € RMB LG11 $ 335.00 £ 241.20 € 291,45 ¥ 2,669.95
LG14
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OD
n Pink Lens: 47% VLTn Optical Density: 190 - 400 nm OD5+, 532 nm OD3+n Alignment Rating: 1 W 2 x 10-4 J 532 RB3
CERTIFIED
Laser Glasses (Page 5 of 5) All graphics represent nominal filter characteristics.
LG13
n Turquoise Lens: 39% VLTn Optical Density: 190 - 380 nm OD5+, 630 - 700 nm OD1.5+n L-Rating:* 180 - 315 D LB6 + R LB4, >315 - 395 DR LB4n Alignment Rating: 0.01 W 2 x 10-6 J 605 - 675 RB1,
0.1 W 2 x 10-5 J >675 - 695 RB2
CERTIFIED
*Wavelength ranges given in nm
*Wavelength ranges given in nm
*Wavelength ranges given in nm
ITEM # $ £ € RMB LG14 $ 200.00 £ 144.00 € 174,00 ¥ 1,594.00
ITEM # $ £ € RMB
LG13 $ 147.90 £ 106.49 € 128,67 ¥ 1,178.76
ITEM # $ £ € RMB LG12 $ 305.00 £ 219.60 € 265,35 ¥ 2,430.85
