Since the output of a laser diode is highly divergent, collimating optics are necessary. You must now adjust this energy density to account for hotspots or other nonuniform intensity profiles and roughly calculate a maximum energy density. 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. Specific material properties for each lens can be found by clicking on the Info Icon  in the tables below and selecting the Glass tab. Product Specifications Beam diameter is also important to know when comparing damage thresholds. 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. 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). The table below lists basic specifications. These compact instruments consist of a laser head, an external +15 V power supply with … 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 - Click on the red Document icon next to the item numbers below to access the Zemax file download. The laser should be of f when plugging or un -plugging the connector. For more information on cleaning optics, please see our Optics Cleaning tutorial. Please keep in mind that these tests are performed on clean optics, as dirt and contamination can significantly lower the damage threshold of a component. 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). A histogram such as that below represents the testing of one BB1-E02 mirror. 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. The longer the pulse duration, the more energy the optic can handle. The LP405-SF30 from Thorlabs Inc is a Laser Diode with Wavelength 405 nm, Output Power 0.3 W, Operating Voltage 5 to 6.5 V, Operating Current 0.1 to 0.15 A, Output Power (CW) 0.3 W. More details for LP405-SF30 can be seen below. The molding process will cause the properties of the glass (e.g., Abbe number) to deviate slightly from those given by glass manufacturers. 29, 517 (1998). However, a better practice is to use the 1/e2 beam diameter. 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. 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. 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. Rev. Continuous wave (CW) lasers typically cause damage from thermal effects (absorption either in the coating or in the substrate). Safe Practices and Light Safety Accessories. 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. Click to view item-specific focal length shift data and spot diagrams at various wavelengths. The maximum ratings mean the limitation over which the laser should not be operated even instant time. 12, 661 (1973). 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. Threshold Current referenced on the attached data sheet is 30 mA with slope efficiency of 0.25. 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. Aspheric Lens in a Fiber Launch Application. Thorlabs offers compact laser modules equipped with a USB connector, phono jack, or bare wire leads. 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. For data presented here, a <1 mm beam size was used to measure the LIDT. 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. [4] N. Bloembergen, Appl. 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. For reference, a Gaussian beam typically has a maximum power density that is twice that of the uniform beam (see lower right). Pulses shorter than 10-9 s cannot be compared to our specified LIDT values with much reliability. The calculation above assumes a uniform beam intensity profile. This graph was obtained from [1]. 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 TC12FC-405 from Thorlabs Inc is a Collimator with Wavelength Range 404 to 406 nm, Focal Length 11.14 mm. 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. When choosing optics, it is important to understand the Laser Induced Damage Threshold (LIDT) of the optics being used. Shop 10,000 + Laser Diodes, Modules & Systems. 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. Mark Frederick (posted 2020-09-08 20:42:37.227) What is the window thickness of the L638P200? The LIDT for an optic greatly depends on the type of laser you are using. 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. Thorlabs specializes in the building blocks for laser and fiber optic systems. These lower thresholds are due to absorption or scattering in the cement or metal coating. 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. Next, the power/energy is either increased or decreased and the optic is exposed at 10 new locations. For beams sizes greater than 5 mm, the LIDT (J/cm2) will not scale independently of beam diameter due to the larger size beam exposing more defects. Pulsed lasers with high pulse repetition frequencies (PRF) may behave similarly to CW beams. The 1/e2 beam diameter therefore captures more of the laser diode's output light (for greater power delivery) and minimizes far-field diffraction (by clipping less of the incident light). S405-XP - Single Mode Optical Fiber, 400 - 680 nm, Ø125 µm Cladding 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). For short pulses, energy density becomes a constant with spot size. Therefore, as the light diverges, an elliptical beam will result. Thorlabs specializes in the building blocks for laser and fiber optic systems. 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. Thorlabs Laser Diodes, Unbiased LASER DIODE SELECTION GUIDE, Compare all Manufacturers and Product Data Sheets on One Site, 370nm to 2350nm. Multimode Pigtails at 405 nm, 462 nm, 520 nm, 635 nm, or 658 nm Center Wavelength Internal 8° Angle-Cleaved Fiber FC/PC (2.0 mm Narrow Key) or SMA905 Connector 1 m of MM Fiber Custom Pigtails Available Upon Request This webpage contains Thorlabs' pigtailed laser diodes with multimode (MM) fiber. This working distance is measured from the lens to the window of the laser diode being collimated (not the emission point). While the test results are only representative of one coating run, Thorlabs specifies damage threshold values that account for coating variances. The damage threshold is then assigned to be the highest power/energy that the optic can withstand without causing damage. For a Gaussian beam profile, the 1/e2 diameter is almost equal to 1.7X the FWHM diameter. 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. Compatible with Thorlabs' Laser Diode and TEC Controllers; ... We offer the DL5146-101S 405 nm laser diode in a 5.6 mm package. Please visit the landing page for more details. This process is repeated until damage is observed. 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. 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°). LDM Series Laser Diode Modules Chapter 3: Description Chapter 3 Description The LDM Series of compact laser sources are well suited to benchtop optical experiments. If your maximum energy density is less than this adjusted LIDT maximum energy density, then the optic should be suitable for your application. Pulsed lasers, on the other hand, often strip electrons from the lattice structure of an optic before causing thermal damage. The Item # listed is that of the unmounted, uncoated lens. A simple example will illustrate the key specifications to consider when choosing the correct lens for a given application. [3] C. W. Carr et al., Phys. These modules offer single-spatial-mode output in com This graph was obtained from [1]. The number of locations that are damaged at a particular power/energy level is recorded. 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, … 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. 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. The maximum ratings mean the limitation over which the laser should not be operated even instant time. Thorlabs offers a large selection of aspheric lenses. The laser should be of f when plugging or un -plugging the connector. Diodes are arranged by wavelength and then power. 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. Average linear power density can be calculated using the equation below. The energy density of your beam should be calculated in terms of J/cm2. LIDT in linear power density vs. pulse length and spot size. When pulse lengths are between 1 ns and 1 µs, laser-induced damage can occur either because of absorption or a dielectric breakdown (therefore, a user must check both CW and pulsed LIDT). 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. 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). In CW applications, for instance, damage scales more strongly with absorption in the coating and substrate, which does not necessarily scale well with wavelength. 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. 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. More details for TC12FC-405 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. 3. When choosing a collimation lens, it is essential to know the divergence angle of the source being used and the desired output diameter. 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. Thorlabs specializes in the building blocks for laser and fiber optic systems. 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). If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately [3]. 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. These mounted aspheres have a metric thread that makes them easy to integrate into an optical setup or OEM application. Thorlabs' Nanosecond Pulsed Laser Diode Systems are designed to provide a convenient, turnkey source of nanosecond pulse trains at repetition frequencies up to 10 MHz. Contact Tech Support for more information. Upon request, we can provide individual test information and a testing certificate. Firmly tighten the clamps using the locking screws. ... Popular λ: View Only 405 nm Laser Diodes; Popular λ: View Only 488 nm Laser Diodes; Its use in high volume consumer product applications forced economies of scale which make this laser diode wavelength affordable and simple to procure. The highlighted columns in the table below outline the relevant pulse lengths for our specified LIDT values. The table to the right defines each letter and lists the specified AR coating range. 3. 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. For long pulses to CW, linear power density becomes a constant with spot size. 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. Lett. 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. Aspheric lenses are designed to focus or collimate light without introducing spherical aberration into the transmitted wavefront. 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. 91, 127402 (2003). 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. 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). 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. 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. 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 ; Laser goggles designed for specific wavelengths should be clearly available near laser setups to protect the wearer from unintentional laser reflections. This lens also has a clear aperture that is larger than the collimated beam diameter. Contact Tech Support for more information. 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. The pulse length must now be compensated for. 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. EFL is specified at 1064 nm rather than at the design wavelength. 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. The specifications to the right are measured data for Thorlabs' AR-coated molded glass aspheric lenses. 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. I have reached out to you directly to discuss the possibility of getting a custom laser. 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. 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. Remember, for optimum coupling the spot size of the focused beam must be less than the MFD of the single mode fiber. Upon request, we can provide individual test information and a testing certificate. For beams with a high PRF both the average and peak powers must be compared to the equivalent CW power. [1] R. M. Wood, Optics and Laser Tech. Do not clean the fiber connector when the diode is in operation. These lenses each have a focal length of 4.6 mm, resulting in an approximate major beam diameter of 2.5 mm. 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. A good rule of thumb is to pick a lens with an NA twice that of the laser diode NA. The working distance is specified at the design wavelength and is measured from the lens to the window of the laser diode being collimated (not the emission point). Clicking on the X takes you to the landing page where that lens (mounted or unmounted) can be purchased. 2. The graph to the right shows why expressing the LIDT as an energy density provides the best metric for short pulse sources. Now compare the maximum power density to that which is specified as the LIDT for the optic. 405nm Blue Laser Diode Definition : The most common blue laser is a 405nm semiconductor diode laser. 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. 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. Thorlabs offers a large selection of mounted and unmounted aspheric lenses to choose from. First, a low-power/energy beam is directed to the optic under test. 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. Thorlabs specializes in the building blocks for laser and fiber optic systems. If your power density is less than the adjusted LIDT of the optic, then the optic should work for your application. 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. 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. 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. For reference a Gaussian beam typically has a maximum energy density that is twice that of the 1/e2 beam. This wavelength and laser type is used more than any other in the blue range. 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. 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). 2. 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. 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]. [2] Roger M. Wood, Laser-Induced Damage of Optical Materials (Institute of Physics Publishing, Philadelphia, PA, 2003). 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).