Specific material properties for each lens can be found by clicking on the Info Icon  in the tables below and selecting the Glass tab. According to the test, the damage threshold of the mirror was 2.00 J/cm2 (532 nm, 10 ns pulse, 10 Hz, Ø0.803 mm). Operating current at 10 mW for this 405nm laser … Opt. The maximum ratings mean the limitation over which the laser should not be operated even instant time. Note that the guideline presented here assumes room temperature operation and optics in new condition (i.e., within scratch-dig spec, surface free of contamination, etc.). 91, 127402 (2003). In order to use the specified CW damage threshold of an optic, it is necessary to know the following: Thorlabs expresses LIDT for CW lasers as a linear power density measured in W/cm. Important Notes: 1. If your maximum energy density is less than this adjusted LIDT maximum energy density, then the optic should be suitable for your application. Upon request, we can provide individual test information and a testing certificate. EFL is specified at 405 nm rather than at the design wavelength. Beam diameter is also important to know when comparing damage thresholds. You must now adjust this energy density to account for hotspots or other nonuniform intensity profiles and roughly calculate a maximum energy density. [3] C. W. Carr et al., Phys. For data presented here, a <1 mm beam size was used to measure the LIDT. To collimate light using one of our mounted aspheric lenses, orient the housing so that the externally threaded end of the mount faces the source. Unfortunately, this is highly dependent on factors such as absorption and thermal diffusivity, so there is no reliable method for determining when a high PRF laser will damage an optic due to thermal effects. Safe Practices and Light Safety Accessories. We … www.thorlabs.com Specifications subject to change without notice. From optomechanical components to telecom test instrumentation, Thorlabs' extensive manufacturing capabilities allow us to ship high quality, well priced components and devices for next-day delivery. In this regime, the LIDT given as an energy density can be applied to any beam diameter; one does not need to compute an adjusted LIDT to adjust for changes in spot size. Each unit is tested before shipment; ... Wavelength 395 nm 405 nm 415 nm Threshold Current* - 20 mA 30 mA Slope Efficiency* 0.2 0.25 - Rev. Click on the red Document icon next to the item numbers below to access the Zemax file download. The maximum ratings mean the limitation over which the laser should not be operated even instant time. Features High Damage Threshold: >10 J/cm 2 Available for 405 nm, 532 nm, 633 nm, 780 - 808 nm, or 1064 nm Wavelengths Optical Contact at Beamsplitter Interface All of these molded glass lenses are also available premounted in non-magnetic 303 stainless steel lens cells that are engraved with the part number for easy identification. Mounted aspheres can be used as a drop-in replacement for multi-element microscope objective by combining the lens with our Microscope Objective Adapter Extension Tube. Absorption is either due to an intrinsic property of the optic or due to surface irregularities; thus LIDT values are only valid for optics meeting or exceeding the surface quality specifications given by a manufacturer. Thorlabs' Enclosure Systems can be used to contain optical setups to isolate or minimize laser hazards. Lett. Thorlabs' LIDT testing is done in compliance with ISO/DIS 11254 and ISO 21254 specifications.First, a low-power/energy beam is directed to the optic under test. This web page contains Thorlabs' UV laser diode with a center wavelength at 375 nm. Upon request, we can provide individual test information and a testing certificate. The optic is exposed in 10 locations to this laser beam for 30 seconds (CW) or for a number of pulses (pulse repetition frequency specified). The LIDT for an optic greatly depends on the type of laser you are using. Please note that we have a buffer built in between the specified damage thresholds online and the tests which we have done, which accommodates variation between batches. These lenses each have a focal length of 4.6 mm, resulting in an approximate major beam diameter of 2.5 mm. Aspheric lenses are commonly chosen to couple incident light with a diameter of 1 - 5 mm into a single mode fiber. For reference, a Gaussian beam typically has a maximum power density that is twice that of the uniform beam (see lower right). The L405G2 from Thorlabs is a 405 nm, 35 mW laser diode suited for a variety of applications, such as fluorescence and spectroscopic measurements, flow cytometry, imaging and microscopy, and materials processing. The target values of these constants are available by clicking on the Info Icons below or by viewing the .pdf  and .dxf files available for each lens. 2. This calculation assumes a uniform beam intensity profile. Contact Tech Support for more information. For this application, the ideal lens is a molded glass aspheric lens with focal length near 5.6 mm and our -B antireflection coating, which covers 780 nm. [1] R. M. Wood, Optics and Laser Tech. While the above procedure provides a good rule of thumb for LIDT values, please contact Tech Support if your wavelength is different from the specified LIDT wavelength. For short pulses, energy density becomes a constant with spot size. Important Notes: 1. Thorlabs' LIDT testing is done in compliance with ISO/DIS 11254 and ISO 21254 specifications. The following is a general overview of how laser induced damage thresholds are measured and how the values may be utilized in determining the appropriateness of an optic for a given application. Pulsed lasers with high pulse repetition frequencies (PRF) may behave similarly to CW beams. [2] Roger M. Wood, Laser-Induced Damage of Optical Materials (Institute of Physics Publishing, Philadelphia, PA, 2003). Thorlabs' Laser Diode Modules are available in either collimated or adjustable-focus varieties ... CPS405 Collimated Laser Diode Module, 405 nm, 4.5 mW, Elliptical Beam, Ø11 mm Housing $185.00 Today CPS450 Collimated Laser Diode Module, 450 nm, 4.5 mW, … Aspheric lenses are designed to focus or collimate light without introducing spherical aberration into the transmitted wavefront. For example, either the A390-B or the A390TM-B could be used as these lenses each have an NA of 0.53, which is more than twice the approximate NA of our laser diode (0.26). This lens also has a clear aperture that is larger than the collimated beam diameter. Threshold Current referenced on the attached data sheet is 30 mA with slope efficiency of 0.25. When choosing a collimation lens, it is essential to know the divergence angle of the source being used and the desired output diameter. Assuming that the width of the lens is negligible compared to the radius of curvature, the thin lens approximation can be used to determine the appropriate focal length for the asphere. Thorlabs specializes in the building blocks for laser and fiber optic systems. The collimated output has a Ø3 mm round beam profile at 50 mm from the housing. Average linear power density can be calculated using the equation below. Pulsed lasers with pulse lengths longer than 1 µs can be treated as CW lasers for LIDT discussions. Thorlabs offers a large selection of aspheric lenses. The laser should be of f when plugging or un -plugging the connector. For monochromatic sources, spherical aberration is often what prevents a single spherical lens from achieving diffraction limited performance when focusing or collimating light. Each USB-equipped laser module has collimated output at 520 or 635 nm, an on/off switch, and a built-in highly attenuating electrical filter to eliminate noise in the laser output, regardless of the power supply used. These compact laser modules feature a typical output power of 0.9 mW (laser safety Class 2) at a 405 nm, 520 nm, or 635 nm typical center wavelength. After exposure, the optic is examined by a microscope (~100X magnification) for any visible damage. This graph was obtained from [1]. This graph was obtained from [1]. However, a better practice is to use the 1/e2 beam diameter. Now compare the maximum power density to that which is specified as the LIDT for the optic. Because dust or other particles on the surface of an optic can cause damage at lower thresholds, we recommend keeping surfaces clean and free of debris. Keep in mind that this calculation is only used for pulses between 10-9 s and 10-7 s. For pulses between 10-7 s and 10-4 s, the CW LIDT must also be checked before deeming the optic appropriate for your application. After screwing the ECM225 clamps to any convenient base or post, such as one of Thorlabs’ TR series optical posts, snap the clamps on to the bottom side of the NPL housing. The highlighted columns in the table below outline the relevant pulse lengths for our specified LIDT values. In CW applications, for instance, damage scales more strongly with absorption in the coating and substrate, which does not necessarily scale well with wavelength. 12, 661 (1973). The table below contains all molded visible and near-IR aspheric lenses offered by Thorlabs. While the test results are only representative of one coating run, Thorlabs specifies damage threshold values that account for coating variances. Our entire, Uncoated: Optics Do Not have an AR Coating, Broadband AR Coating for the 350 - 700 nm or 400 - 600 nm Range, Broadband AR Coating for the 600 - 1050 nm or 650 - 1050 nm Range, Broadband AR Coating for the 1050 - 1620 nm or 1050 - 1700 nm Range, Narrowband AR Coating Designed for the Wavelength Listed in the Table Below, Collimate or Focus Light with a Single Element, Positive Radius Indicates that the Center of Curvature is to the Right of the Lens, Negative Radius Indicates that the Center of Curvature is to the Left of the Lens, Desired Collimated Beam Diameter: Ø3 mm (Major Axis), Approximate intensity profile of your beam (e.g., Gaussian), Linear power density of your beam (total power divided by 1/e, Energy density of your beam (total energy divided by 1/e, Pulse repetition frequency (prf) of your laser. ¾|Rö×ØZOµÝÿóÕßë]ûýr֎¹c”A¬.Jû1er³Tÿ?ÞûöÝ¿§sV/§L–~¶)K:e_p‚¤ãó#Ÿ~ïïõËþ€…4ñvD Ԅöô² _Ò¯¤î²ðÓBéFéØb,]ˆ`¤~íJê×gJˆ¡½0ô*ÓsìÉX„QËò1¦zߏ9¸ òðÇæïÀ½B֓_¿ËÔÊÄärܛ_šÉß~GYtB. The molding process will cause the properties of the glass (e.g., Abbe number) to deviate slightly from those given by glass manufacturers. If your power density is less than the adjusted LIDT of the optic, then the optic should work for your application. www.thorlabs.com Specifications subject to change without notice. Clicking on the X takes you to the landing page where that lens (mounted or unmounted) can be purchased. This specification should be matched to the diffraction-limited spot size given by the following equation: Here, f is the focal length of the lens, λ is the wavelength of the input light, and D is the diameter of collimated beam incident on the lens. Molded glass aspheres are manufactured from a variety of optical glasses to yield the indicated performance. Testing may result in additional costs or lead times. A simple example will illustrate the key specifications to consider when choosing the correct lens for a given application. The TC12FC-405 from Thorlabs Inc is a Collimator with Wavelength Range 404 to 406 nm, Focal Length 11.14 mm. Thorlabs offers high-power, polarizing beamsplitter cubes designed for use at 405 nm, 633 nm, the 780 - 808 nm range, or with one of three major Nd:YAG harmonics (355 nm, 532 nm, or 1064 nm). Thorlabs offers compact laser modules equipped with a USB connector, phono jack, or bare wire leads. For more information on cleaning optics, please see our Optics Cleaning tutorial. These 1/2 (12.7 mm) and 1 (25.4 mm) cubes have a dielectric V-coating on four faces that minimizes re In general, using a collimating lens with a short focal length will result in a small collimated beam diameter and a large beam divergence, while a lens with a large focal length will result in a large collimated beam diameter and a small divergence. Result in additional costs or lead times for an optic greatly depends the... 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