Pulsed lasers often do not heat the optic enough to damage it; instead, pulsed lasers produce strong electric fields capable of inducing dielectric breakdown in the material. Its use in high volume consumer product applications forced economies of scale which make this laser diode wavelength affordable and simple to procure. Thorlabs specializes in the building blocks for laser and fiber optic systems. 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. While the test results are only representative of one coating run, Thorlabs specifies damage threshold values that account for coating variances. 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. 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). Safe Practices and Light Safety Accessories. Mark Frederick (posted 2020-09-08 20:42:37.227) What is the window thickness of the L638P200? [4] N. Bloembergen, Appl. Compatible with Thorlabs' Laser Diode and TEC Controllers; ... We offer the DL5146-101S 405 nm laser diode in a 5.6 mm package. The Item # listed is that of the unmounted, uncoated lens. These lower thresholds are due to absorption or scattering in the cement or metal coating. 29, 517 (1998). 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. For reference a Gaussian beam typically has a maximum energy density that is twice that of the 1/e2 beam. Testing may result in additional costs or lead times. This calculation assumes a uniform beam intensity profile. Thorlabs' LIDT testing is done in compliance with ISO/DIS 11254 and ISO 21254 specifications. Important Notes: 1. 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 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 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. This wavelength and laser type is used more than any other in the blue range. 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 power density is less than the adjusted LIDT of the optic, then the optic should work for your application. Thorlabs offers compact laser modules equipped with a USB connector, phono jack, or bare wire leads. Up to this point, we have been using the full-width at half maximum (FWHM) beam diameter to characterize the beam. 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. Important Notes: 1. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately [3]. Solving for the desired focal length of the collimating lens yields. 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.). 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. Thorlabs specializes in the building blocks for laser and fiber optic systems. These mounted aspheres have a metric thread that makes them easy to integrate into an optical setup or OEM application. 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. EFL is specified at 1064 nm rather than at the design wavelength. Operating current at 10 mW for this 405nm laser … When choosing optics, it is important to understand the Laser Induced Damage Threshold (LIDT) of the optics being used. With this information known, it is now time to choose the appropriate collimating lens. Contact Tech Support for more information. The table below contains all molded visible and near-IR aspheric lenses offered by Thorlabs. 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. Average linear power density can be calculated using the equation below. www.thorlabs.com Specifications subject to change without notice. This working distance is measured from the lens to the window of the laser diode being collimated (not the emission point). 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. For a Gaussian beam profile, the 1/e2 diameter is almost equal to 1.7X the FWHM diameter. Lett. [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. The LIDT for an optic greatly depends on the type of laser you are using. 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. Product Specifications A histogram such as that below represents the testing of one BB1-E02 mirror. Additionally, for highly transparent materials, there is little to no drop in the LIDT with increasing PRF. When choosing a collimation lens, it is essential to know the divergence angle of the source being used and the desired output diameter. 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. The pulse length must now be compensated for. These lenses each have a focal length of 4.6 mm, resulting in an approximate major beam diameter of 2.5 mm. [1] R. M. Wood, Optics and Laser Tech. The clear aperture of the unmounted lens is different on either side. For beams with a high PRF both the average and peak powers must be compared to the equivalent CW power. For long pulses to CW, linear power density becomes a constant with spot size. 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. 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. 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. The laser should be of f when plugging or un -plugging the connector. The molding process will cause the properties of the glass (e.g., Abbe number) to deviate slightly from those given by glass manufacturers. 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. We … Since the output of a laser diode is highly divergent, collimating optics are necessary. The maximum ratings mean the limitation over which the laser should not be operated even instant time. 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 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). Shop 10,000 + Laser Diodes, Modules & Systems. The TC12FC-405 from Thorlabs Inc is a Collimator with Wavelength Range 404 to 406 nm, Focal Length 11.14 mm. 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. Pulsed lasers with high pulse repetition frequencies (PRF) may behave similarly to CW beams. Contact Tech Support for more information. 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. 2. This graph was obtained from [1]. More details for TC12FC-405 can be seen below. Threshold Current referenced on the attached data sheet is 30 mA with slope efficiency of 0.25. 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. Continuous wave (CW) lasers typically cause damage from thermal effects (absorption either in the coating or in the substrate). 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. 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. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately. Thorlabs specializes in the building blocks for laser and fiber optic systems. The laser should be of f when plugging or un -plugging the connector. The graph to the right shows why expressing the LIDT as an energy density provides the best metric for short pulse sources. The longer the pulse duration, the more energy the optic can handle. These modules offer single-spatial-mode output in com For short pulses, energy density becomes a constant with spot size. The mounted aspheres are readily adapted to our SM1 series of lens tubes by using our Aspheric Lens Adapters. However, a better practice is to use the 1/e2 beam diameter. 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 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. You must now consider hotspots in the beam or other non-uniform intensity profiles and roughly calculate a maximum power density. 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. This lens also has a clear aperture that is larger than the collimated beam diameter. ... Popular λ: View Only 405 nm Laser Diodes; Popular λ: View Only 488 nm Laser Diodes; 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. The table below lists basic specifications. The number of locations that are damaged at a particular power/energy level is recorded. 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. For data presented here, a <1 mm beam size was used to measure the LIDT. www.thorlabs.com Specifications subject to change without notice. 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. Thus, an aspheric lens is often the best single element solution for many applications including collimating the output of a fiber or laser diode, coupling light into a fiber, spatial filtering, or imaging light onto a detector. Next, the power/energy is either increased or decreased and the optic is exposed at 10 new locations. The damage analysis will be carried out on a similar optic (customer's optic will not be damaged). Thorlabs offers a large selection of aspheric lenses. Do not clean the fiber connector when the diode is in operation. Clicking on the X takes you to the landing page where that lens (mounted or unmounted) can be purchased. 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). Pigtailed Laser Diode, SMF from Thorlabs. 91, 127402 (2003). Aspheric lenses are designed to focus or collimate light without introducing spherical aberration into the transmitted wavefront. 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. I have reached out to you directly to discuss the possibility of getting a custom laser. Molded glass aspheres are manufactured from a variety of optical glasses to yield the indicated performance. Thorlabs Laser Diodes, Unbiased LASER DIODE SELECTION GUIDE, Compare all Manufacturers and Product Data Sheets on One Site, 370nm to 2350nm. The LDM Series modules come in six wavelength versions: 405, 635, 670, 785, 850, and 1550 nm. 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. Links to the files can be found by clicking on the item number in the price tables below. 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). 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. Aspheric lenses are commonly chosen to couple incident light with a diameter of 1 - 5 mm into a single mode fiber. 12, 661 (1973). Example:Fiber: P1-630A-FC-2Collimated Beam Diameter Prior to Lens: Ø3 mm. The collimated output has a Ø3 mm round beam profile at 50 mm from the housing. 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. 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. Now compare the maximum energy density to that which is specified as the LIDT for the optic. This process is repeated until damage is observed. As previously stated, pulsed lasers typically induce a different type of damage to the optic than CW lasers. 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. In this ultra-short-pulse regime various mechanics, such as multiphoton-avalanche ionization, take over as the predominate damage mechanism [2]. 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. The highlighted columns in the table below outline the relevant pulse lengths for our specified LIDT values. Do not clean the fiber connector when the diode is in operation. 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. 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