For our selection of IR molded aspheres, click here. Unfortunately, it can be very difficult to compare the LIDT specification of an optic to your laser. 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 - Upon request, we can provide individual test information and a testing certificate. These lower thresholds are due to absorption or scattering in the cement or metal coating. This working distance is measured from the lens to the window of the laser diode being collimated (not the emission point). 12, 661 (1973). Low Power Violet Laser Diode - LP405-SF10 has the following features: Wavelength is 405 nm (395 nm - 415 nm), Output Power is 10 mW, FP Laser Diode, TO-can, and more. For more information on cleaning optics, please see our Optics Cleaning tutorial. [2] Roger M. Wood, Laser-Induced Damage of Optical Materials (Institute of Physics Publishing, Philadelphia, PA, 2003). 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. Damage threshold specifications are constant for all 405 nm or 1064 nm AR-coated molded glass aspheric lenses, regardless of the mounting option or focal length of the lens. This wavelength and laser type is used more than any other in the blue range. 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. Click to view item-specific focal length shift data and spot diagrams at various wavelengths. For data presented here, a <1 mm beam size was used to measure the LIDT. EFL = Effective Focal LengthNA = Numerical ApertureCA = Clear Aperture, WD = Working DistanceDW = Design Wavelength, Molded Glass Aspheric Lenses, 405 nm or 1064 nm AR Coating, f = 4.02 mm, NA = 0.6, Unmounted Geltech Aspheric Lens, AR: 405 nm, f = 4.02 mm, NA = 0.6, Mounted Geltech Aspheric Lens, AR: 405 nm, f = 4.51 mm, NA = 0.551, Unmounted Geltech Aspheric Lens, AR: 1064 nm, f = 4.51 mm, NA = 0.551, Mounted Geltech Aspheric Lens, AR: 1064 nm, f = 6.24 mm, NA = 0.40, Unmounted Geltech Aspheric Lens, AR: 1064 nm, f = 6.24 mm, NA = 0.40, Mounted Geltech Aspheric Lens, AR: 1064 nm, f = 8.00 mm, NA = 0.50, Unmounted Geltech Aspheric Lens, AR: 1064 nm, f = 8.00 mm, NA = 0.50, Mounted Geltech Aspheric Lens, AR: 1064 nm, f = 11.00 mm, NA = 0.25, Unmounted Geltech Aspheric Lens, AR: 1064 nm, f = 11.00 mm, NA = 0.25, Mounted Geltech Aspheric Lens, AR: 1064 nm, f = 18.40 mm, NA = 0.15, Unmounted Geltech Aspheric Lens, AR: 1064 nm, f = 18.40 mm, NA = 0.15, Mounted Geltech Aspheric Lens, AR: 1064 nm, Aspheric Lenses: Molded & Precision Polished, Microscope Objective Adapter Extension Tube, Plastic Aspheres: Uncoated 80-50 Scratch-Dig, Plastic Aspheres: AR Coated 80-50 Scratch-Dig. For a Gaussian beam profile, the 1/e2 diameter is almost equal to 1.7X the FWHM diameter. Links to the files can be found by clicking on the item number in the price tables below. This graph was obtained from [1]. As a guideline these coatings can withstand 100 W/cm2 CW input power or 0.1 J/cm2 with 10 ns pulse energy at 1064 nm. 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. If your maximum energy density is less than this adjusted LIDT maximum energy density, then the optic should be suitable for your application. The L405P150 from Thorlabs Inc is a Laser Diode with Wavelength 405 nm, Output Power 0.15 W, Operating Voltage 4.9 to 5.5 V, Operating Current 0.138 to 0.17 A, Output Power (CW) 0.15 W. More details for L405P150 can be seen below. Low Power Violet Laser Diode - WSLD-405-200m-1 has the following features: Wavelength is 405 nm (400 nm - 410 nm), Output Power is 200 mW, FP Laser Diode, TO-can, and more. As a result, if an aspheric lens is not available that provides an exact match, then choose the aspheric lens with a focal length that is shorter than the calculation above yields. In contrast, pulses between 10-7 s and 10-4 s may cause damage to an optic either because of dielectric breakdown or thermal effects. With this information known, it is now time to choose the appropriate collimating lens. The number of locations that are damaged at a particular power/energy level is recorded. In this regime, the LIDT given as a linear power density can be applied to any beam diameter; one does not need to compute an adjusted LIDT to adjust for changes in spot size, as demonstrated by the graph to the right. The blue Info button next to the part number within the table opens a pop-up window, which contains in-depth information regarding the diode. Assuming a divergence angle of 30° (FWHM) and desired beam diameter of 3 mm: Note that the focal length is generally not equal to the needed distance between the light source and the lens. 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. In CW applications, for instance, damage scales more strongly with absorption in the coating and substrate, which does not necessarily scale well with wavelength. LIDT in linear power density vs. pulse length and spot size. 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. Now compare the maximum power density to that which is specified as the LIDT for the optic. Contact Tech Support for more information. A fiber-pigtailed laser should always be turned off before connecting it to or disconnecting it from another fiber, especially when the laser is at power levels above 10 mW. The optional 405 nm laser output is delivered on its own single mode fiber and is combined after the beam expander in the Scan Head module. When choosing a collimation lens, it is essential to know the divergence angle of the source being used and the desired output diameter. For monochromatic sources, spherical aberration is often what prevents a single spherical lens from achieving diffraction limited performance when focusing or collimating light. These mounted aspheres have a metric thread that makes them easy to integrate into an optical setup or OEM application. Alternatively, if the clear aperture of the aspheric lens is large enough, the beam can be expanded before the aspheric lens, which has the result of reducing the spot size of the focus beam. 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. Its use in high volume consumer product applications forced economies of scale which make this laser diode wavelength affordable and simple to procure. ... Popular λ: View Only 405 nm Laser Diodes; Popular λ: View Only 488 nm Laser Diodes; Pigtailed Laser Diode, SMF from Thorlabs. The mounted aspheres are readily adapted to our SM1 series of lens tubes by using our Aspheric Lens Adapters. When an optic is damaged by a continuous wave (CW) laser, it is usually due to the melting of the surface as a result of absorbing the laser's energy or damage to the optical coating (antireflection) [1]. An "X" in any of the five AR Coating Columns indicates the lens is available with that coating (note that the V coating availability is indicated with the design wavelength). Thorlabs’ Single Mode Pigtailed Laser Diodes are standard TO-packaged diodes that have been pigtailed to a 1 m long single mode fiber with an FC/PC connector. The longer the pulse duration, the more energy the optic can handle. Thorlabs specializes in the building blocks for laser and fiber optic systems. The specifications to the right are measured data for Thorlabs' AR-coated molded glass aspheric lenses. Contact Tech Support for more information. Thorlabs specializes in the building blocks for laser and fiber optic systems. The damage analysis will be carried out on a similar optic (customer's optic will not be damaged). Aspheric Lens in a Fiber Launch Application. The specifications for the P1-630A-FC-2, 630 nm, FC/PC single mode patch cable indicate that the mode field diameter (MFD) is 4.3 μm. 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. Since the output of a laser diode is highly divergent, collimating optics are necessary. If an unmounted aspheric lens is being used to collimate the light from a point source or laser diode, the side with the greater radius of curvature (i.e., the flatter surface) should face the point source or laser diode. 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. Do not clean the fiber connector when the diode is in operation. Therefore, as the light diverges, an elliptical beam will result. Thorlabs offers a large selection of aspheric lenses. There are multiple regimes in which a pulsed laser can damage an optic and this is based on the laser's pulse length. In this ultra-short-pulse regime various mechanics, such as multiphoton-avalanche ionization, take over as the predominate damage mechanism [2]. Clicking on the X takes you to the landing page where that lens (mounted or unmounted) can be purchased. 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 pulse length must now be compensated for. 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. Aspheric lenses do not introduce spherical aberration and are therefore are commonly chosen when the collimated laser beam is to be between one and five millimeters. Threshold Current referenced on the attached data sheet is 30 mA with slope efficiency of 0.25. 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. The TC12FC-405 from Thorlabs Inc is a Collimator with Wavelength Range 404 to 406 nm, Focal Length 11.14 mm. Mark Frederick (posted 2020-09-08 20:42:37.227) What is the window thickness of the L638P200? This graph was obtained from [1]. While the LIDT, when expressed in units of J/cm², scales independently of spot size; large beam sizes are more likely to illuminate a larger number of defects which can lead to greater variances in the LIDT [4]. This web page contains Thorlabs' UV laser diode with a center wavelength at 375 nm. Continuous wave (CW) lasers typically cause damage from thermal effects (absorption either in the coating or in the substrate). When comparing an LIDT specified for a pulsed laser to your laser, it is essential to know the following: LIDT in energy density vs. pulse length and spot size. Solving for the desired focal length of the collimating lens yields. Firmly tighten the clamps using the locking screws. The graph to the right shows why expressing the LIDT as an energy density provides the best metric for short pulse sources. Click on the red Document icon next to the item numbers below to access the Zemax file download. Thorlabs recommends the use of safety eyewear whenever working with laser beams with non-negligible powers (i.e., > Class 1) since metallic tools such as screwdrivers can accidentally redirect a beam. To collect as much light as possible during the collimation process, consider the larger of these two divergence angles in any calculations (i.e., in this case, use 30°). The table to the right defines each letter and lists the specified AR coating range. 29, 517 (1998). If you wish to convert your elliptical beam into a round one, we suggest using an Anamorphic Prism Pair, which magnifies one axis of your beam. While many optics can handle high power CW lasers, cemented (e.g., achromatic doublets) or highly absorptive (e.g., ND filters) optics tend to have lower CW damage thresholds. 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. The C171TMD-B (mounted) or 354171-B (unmounted) aspheric lenses have a focal length of 6.20 mm, which will result in a collimated beam diameter (major axis) of 3.3 mm. A simple example will illustrate the key specifications to consider when trying to choose the correct lens. The clear aperture of the unmounted lens is different on either side. The energy density of your beam should be calculated in terms of J/cm2. Thorlabs' LIDT testing is done in compliance with ISO/DIS 11254 and ISO 21254 specifications. 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). After exposure, the optic is examined by a microscope (~100X magnification) for any visible damage. 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 While the test results are only representative of one coating run, Thorlabs specifies damage threshold values that account for coating variances. For pulse widths between 1 - 100 ns, an approximation is as follows: Use this formula to calculate the Adjusted LIDT for an optic based on your pulse length. I have reached out to you directly to discuss the possibility of getting a custom laser. The mounted working distance is measured from the edge of the unthreaded portion of the housing. Pulses shorter than 10-9 s cannot be compared to our specified LIDT values with much reliability. The aspheric lens with a focal length that is closest to 16 mm has a focal length of 15.29 mm (Item# 354260-B or A260-B). Next, check to see if the numerical aperture (NA) of the diode is smaller than the NA of the lens: 0.30 = NALens > NADiode ≈ sin(15°) = 0.26. A good rule of thumb is to pick a lens with an NA twice that of the laser diode NA. This lens also has a clear aperture that is larger than the collimated beam diameter. Additionally, for highly transparent materials, there is little to no drop in the LIDT with increasing PRF. The Item # listed is that of the unmounted, uncoated lens. This means that both CW and pulsed damage thresholds must be compared to the laser beam to determine whether the optic is suitable for your application. These 1/2 (12.7 mm) and 1 (25.4 mm) cubes have a dielectric V-coating on four faces that minimizes re A good rule of thumb is that the damage threshold has an inverse square root relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 1 J/cm2 at 1064 nm scales to 0.7 J/cm2 at 532 nm): You now have a wavelength-adjusted energy density, which you will use in the following step. 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 calculation above assumes a uniform beam intensity profile. 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. A simple example will illustrate the key specifications to consider when choosing the correct lens for a given application. Upon request, we can provide individual test information and a testing certificate. 3. These lenses each have a focal length of 4.6 mm, resulting in an approximate major beam diameter of 2.5 mm. Opt. As previously stated, pulsed lasers typically induce a different type of damage to the optic than CW lasers. www.thorlabs.com Specifications subject to change without notice. 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). Operating current at 10 mW for this 405nm laser … This process is repeated until damage is observed. Up to this point, we have been using the full-width at half maximum (FWHM) beam diameter to characterize the beam. 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. Thorlabs' Enclosure Systems can be used to contain optical setups to isolate or minimize laser hazards. A good rule of thumb is that the damage threshold has a linear relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 10 W/cm at 1310 nm scales to 5 W/cm at 655 nm): While this rule of thumb provides a general trend, it is not a quantitative analysis of LIDT vs wavelength. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately [3]. Therefore, this aspheric lens is the best option given the initial parameters (i.e., a P1-630A-FC-2 single mode fiber and a collimated beam diameter of 3 mm). 2. Thorlabs offers compact laser modules equipped with a USB connector, phono jack, or bare wire leads. Safe Practices and Light Safety Accessories. 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. Pulsed lasers with high pulse repetition frequencies (PRF) may behave similarly to CW beams. The table below lists basic specifications. The damage threshold for these lenses is determined by the antireflective (AR) coating. A histogram such as that below represents the testing of one BB1-E02 mirror. However, a better practice is to use the 1/e2 beam diameter. The LDM Series modules come in six wavelength versions: 405, 635, 670, 785, 850, and 1550 nm. Example:Fiber: P1-630A-FC-2Collimated Beam Diameter Prior to Lens: Ø3 mm. 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. Figure 4 shows an example of an NPL laser head mounted on an optical table. Beam diameter is also important to know when comparing damage thresholds. Low Power Violet Laser Diode - 8mm diameter 405nm 1mW Blue Laser Module has the following features: Wavelength is 405 nm, Output Power is 1 mW, Submodules, and more. 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. This calculation assumes a uniform beam intensity profile. When choosing optics, it is important to understand the Laser Induced Damage Threshold (LIDT) of the optics being used. 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. 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