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Laser Fluence. The LDT calculator scales by laser wavelength and pulse duration based on the nominal specification, it should be noted that while the equations scale fairly linearly in the nanosecond range, the damage mechanism changes from primarily thermal to electron field breakdown when switching to the picosecond scale for pulse duration. Payment & Shipping For small changes in these specifications, the resulting scaling of LIDT can be approximated. Semrock manufactures hundreds of standard optical filters for immediate shipping: bandpass filters, You can change this selection at any time, but products in your cart, saved lists, or quote may be removed if they are unavailable in the new shipping country/region. Mathematically model beam propagation of Gaussian beam using simple geometric parameters. The approximate LIDT at the new use conditions will be more than 2X higher than the LIDT at the test conditions. filters sets. Calculator uses first order approximations and assumes TEM00 mode to determine beam spot size in free space applications. Circular Rectangular. Average power Pulse width FWHM: Repetition rate: Wavelength: Peak power: Duty cycle: p-t-p time: Pulse energy: Photons per pulse: Add . Note: Results greater than 1,000,000 are rounded to infinity. CW. For Custom optical filters, engineering design or system design support, please contact Please note that results will vary based on beam quality and application conditions. Edmund Optics® remains operational, including our 24-hour product & application support. Measurement. The LDT calculator should not be substituted for direct LIDT testing of optics utilized in a given application where laser damage is a crucial parameter. Answer: The approximate LIDT at the new use conditions can be determined by: \begin{align}\text{LIDT} \! You can change this selection at any time, but products in your cart, saved lists, or quote may be removed if they are unavailable in the new shipping country/region. Tax Certificates. For continuous-wave beams, the term fluence is meaningful only in combination with some irradiation time. This calculator takes a given LIDT value for a pulsed laser at a known wavelength (λ1), pulse duration (τ1), and beam diameter (∅1), and scales it to a new LIDT at a different wavelength (λ2), pulse duration (τ2), and beam diameter (∅2). Payment & Shipping Ophir's sensor finder allows you to easily find the sensor that best suits your application. \left( \lambda_2, \tau_2, ∅_2 \right) \approx \text{LIDT} \! View updates or contact us today! Laser fluences examined during the experimental process are relatively high, between 9 and 14J/cm2 for Mo and 12 and 20J/cm2 for Al. Laser. “Laser Induced Damage Studies in Borosilicate Glass Using Nanosecond and Sub Nanosecond Pulses.”, Smith, Arlee V., and Binh T. Do. LDT Laser-Damage Threshold Calculator LIDT Performance Damage Calculating-laser-damage Damage-threshold. A Gaussian pulse shape is assumed. most optics don't ever achieve their perfect calculated LDT. “Bulk And Surface Damage Thresholds Of Crystals And Glasses At 248 nm.”, Rastogi, Vinay, et al. Sensor Finder and Laser Fluence Calculator. \left( 515 \text{nm}, 30 \text{ns}, 2 \text{mm} \right) &  \approx 10 \tfrac{\text{J}}{\text{cm}^2} \times \left( \frac{515 \text{nm}}{532 \text{nm}} \right) \times \sqrt{\frac{30 \text{ns}}{20 \text{ns}}} \times \left( \frac{3 \text{mm}}{2 \text{mm}} \right)^2  \\& = 26.7 \tfrac{\text{J}}{\text{cm}^2} \end{align}. This will help ensure a high energy deposition in a small volume for rapid and complete ablation. i. Beam. Address Book, For optical pulses, wavelength is considered and photon flux is given. Edmund Optics® remains operational, including our 24-hour product & application support. In some cases, one is interested in the peak fluence, which is the highest fluence value occurring within the laser beam profile. Pulsed. Sensor finder instructions and notes . How to calculate handheld laser power from mW to J/cm^2 ... W/cm2) was varied to achieve various energy densities (fluence, J/cm2) for treating samples. Calculator uses first order approximations and assumes TEM 00 mode to determine beam spot size in free space applications. The LDT calculator should not be substituted for direct LIDT testing of optics utilized in a given application where laser damage is a crucial parameter. i. Flat-Top. Due to environmental variables such as molecular contamination, physical contamination, mounting stress, temperature, etc. In radiometry, radiant exposure or fluence is the radiant energy received by a surface per unit area, or equivalently the irradiance of a surface, integrated over time of irradiation, and spectral exposure is the radiant exposure per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength. us to discuss your specific needs. \left( z \right) = z \left[ 1 + \left( \frac{z_R}{z} \right)^2 \right] $$,$$ \theta = \frac{\lambda}{\pi \, \omega_0} $$. most optics don't ever achieve their perfect calculated LDT. We have set your country/region to United States. Semrock's Laser Damage Threshold Calculator is provided for reference / guidance purposes only. Contact : Catalogs : Company : Discount Programs, Copyright year, Edmund Optics Inc., 101 East Gloucester Pike, Barrington, NJ 08007-1380 USA, California Consumer Privacy Act (CCPA): Do Not Sell My Information. Description.$$ z_R = \frac{\pi \omega_0 ^2}{\lambda} $$,$$ \omega \! The laser induced damage threshold (LIDT) of an optical component is dependent on wavelength, pulse duration, and beam diameter. We have set your country/region to United States. For a laser beam, the fluence is often highest on the beam axis and lower at positions somewhat away from that axis. Please note that results will vary based on beam quality and application conditions. Mathematically model beam propagation of Gaussian beam using simple geometric parameters. Finally, most optics will have specific regions with low laser damage thresholds due to material absorption, these include OH lines and lower UV wavelength ranges. Measurement Type . LDT specifications can be found on each product webpage under the Optical Damage Rating header of the Specifications tab. “Bulk and Surface Laser Damage of Silica by Picosecond and Nanosecond Pulses at 1064 Nm.”, Stuart, B. C., et al. Contact : Catalogs : Company : Discount Programs, Copyright year, Edmund Optics Inc., 101 East Gloucester Pike, Barrington, NJ 08007-1380 USA, California Consumer Privacy Act (CCPA): Do Not Sell My Information, $$\text{LIDT} \! Since the equation used is only valid for small shifts in use parameters, this calculator is only intended to be used for shifts in use conditions within these limits: Note: Temporal scaling of pulse duration following (τ2/τ1)0.5 is a commonly accepted convention and experimental observations of this relationship range from (τ2/τ1)0.3 to (τ2/τ1)0.6, depending on what exactly was measured.1. Add a stock number to begin our two-step quote process. Due to environmental variables such as molecular contamination, physical contamination, mounting stress, temperature, etc. I thought beam expanders increased a laser beam's size. View updates or contact us today! Fluence (Joules/cm^2) = laser pulse energy (J) / focal spot area (cm^2) while the peak power is. \left( z \right) = \omega_0 \sqrt{1 + \left( \frac{z}{z_R} \right) ^2}$$, $$R \! The laser induced damage threshold (LIDT) of an optical component is dependent on wavelength, pulse duration, and beam diameter. Note: This calculator is valid for wavelengths between 248-1100nm, pulse durations between 1-100ns, and beam diameters between 1-25mm. The larger the difference between the test conditions and the use conditions, the less accurate the scaling. Peak power (W) = pulse energy (J) / pulse duration (sec) There are several key parameters to consider for laser ablation. Step 2. For further information on LDT, please refer to our Laser Damage Threshold technical note. dichroic beamsplitters, edge and notch filters, Raman spectroscopy filters, mirrors and fluorescence Tax Certificates. Power Only. Add a stock number to begin our two-step quote process. Calculates peak power, pulse energy, period, etc, from laser or electrical pulse characteristics (repetition rate, average power, pulse width). Send us your laser model . Understanding and Specifying LIDT of Laser Components, Importance of Beam Diameter on Laser Damage Threshold, Why Laser Damage Testing is Critical for UV Laser Applications, The Complexities of High-Power Optical Coatings, The Art and Science of Designing Optics for Laser-Induced Damage Threshold, Niemz, M. H. “Threshold Dependence of Laser‐Induced Optical Breakdown on Pulse Duration.”, Rainer, F., et al. “Nanosecond-to-Femtosecond Laser-Induced Breakdown in Dielectrics.”. The first is selection of a wavelength with a minimum absorption depth. Step 1. Need Help? \left( \lambda_1, \tau_1, ∅_1 \right) \times \left( \frac{\lambda_2}{\lambda_1} \right) \times \sqrt{\frac{\tau_2}{\tau_1}} \times \left( \frac{∅_1}{∅_2} \right)^2$$. Energy and Power. If an optic’s specified LIDT is at a different wavelength, pulse duration, or diameter than that of the application, the LIDT must be re-evaluated at the application specifications. Gaussian. How can that help me to get a smaller spot? Question: What is the approximate LIDT of an optic at a wavelength of 515nm, pulse duration of 30ns, and beam diameter of 2mm if the optic has a specified LIDT of 10 J/cm2 at a wavelength of 532nm, pulse duration of 20ns, and beam diameter of 3mm? Address Book, If an optic’s specified LIDT is at a different wavelength, pulse duration, or diameter than that of the application, the LIDT must be re-evaluated at the application specifications. Enter Laser Parameters .