High power gratings
Fused silica transmission gratings offer an order of magnitude higher power handling capability than any other grating technology including conventional Au-coated reflection gratings and VPH gratings.
While specific substrate materials and optional AR coatings may differ, all Ibsen gratings are based on fused silica, with excellent transmission characteristics in all wavelength regions – from below 200 nm to above 2000 nm.
All our gratings are therefore ideal for high power applications, and we furthermore manufacture custom gratings for many different niche applications:
Power damage threshold
“High power applications” is a broad term; power damage threshold cannot easily be stated in just one or two numbers. Furthermore, to date we do not have information of any power level that has in fact caused damage to our gratings. The table below lists compiled experimental data provided by customers/partners.
Example applications – below damage threshold
| Wavelength | Operation | Pulse energy | Pulse length | Beam diameter | Peak power | Rep rate | Reference |
|---|---|---|---|---|---|---|---|
| 248 nm | Pulsed | 55 mJ/cm2 | 500 fs | N/A | 100 GW/cm2 | 10 Hz | FORTH-IESL |
| 248 nm | Pulsed | 105 mJ/cm2 | 5 ps | N/A | 20 GW/cm2 | 10 Hz | FORTH-IESL |
| 264 nm | Pulsed | 300 μJ | 220 fs | 3 mm (before 1D focusing) | 19 GW/cm2 | 27 Hz | University College Cork |
| 500 nm | Pulsed | 150 μJ | 250 fs | 1.28 mm | 88 GW/cm2 | 10 kHz | Politecnico di Milano |
| 785 nm | Pulsed | 1.04 J/cm2 | 40 fs | 0.14 mm (FWHM) | 24.4 TW/cm2 | 3 kHz | ICFO - Reported Damage threshold |
| 800 nm | Pulsed | 2.1 mJ | 70 fs | 5 mm | 150 GW/cm2 | 1 kHz | Temple University, CAPR |
| 800 nm | Pulsed | 2.0 mJ | 100 fs | 6x8 mm | 40 GW/cm2 | 1 kHz | Sincrotrone Trieste |
| 808 nm | CW | N/A | N/A | ~1.4 mm | 65 kW/cm2 | N/A | |
| 808 nm | CW | N/A | N/A | 4 mm | 47 kW/cm2 | N/A | RAM Photonics |
| 975 nm | CW | N/A | N/A | ~0.2 mm | 250 kW/cm2 | N/A | |
| 1030 nm | Pulsed | 4.7 μJ | 100 fs | 2 mm | 1.5 GW/cm2 | 10 MHz | ETH/ULP |
| 1064 nm | Pulsed/CW | 1 μJ | 100 fs | 10-20 mm | 5,6 MW/cm2 | 40 GHz | |
| 1064 nm | Pulsed, input | 150 nJ | 10 ps | 0.75-1 mm | 2,5 MW/cm2 | 80 MHz | NKT Research |
| 1064 nm | Pulsed, output | 87 nJ | 500 fs | 0.75-1 mm | 30 MW/cm2 | 80 MHz | NKT Research |
| 1064 nm | Pulsed | 17.6 J | 4 ns | 0.42 mm | 3.2 TW/cm2 | N/A | Reported Damage threshold |
| 1064 nm | CW | N/A | N/A | 1.6 mm | 80 kW/cm2 | N/A | |
| 1064 +/- 20 nm | Pulsed | 1.5 μJ | 5 ps | 1-2 mm | 17 MW/cm2 | 100 MHz |
A couple of the above test result providers have graciously allowed us to make their full test report available here:
We will be adding to this table as we receive further results from our customers – please send us any such data you have – we are especially interested in hearing of any achieved power levels that actually have led to grating damage! We are equally happy to reference you or not as you prefer.
All Ibsen gratings are high power capable.
Which transmission grating to use?
For further information or to request a quotation please contact us.