Mirrors For Big and Scary fs/ps Lasers
Leading ULTRAFAST to even higher powers
High laser power levels call for high-power measures. OPTOMAN is here to save the day with high reflectivity IBS mirror coatings designed for big & scary ultrafast Yb:YAG, Yb:KYW/KGW, Yb doped fiber lasers.
It may look like standard mirror design, but it is not - it may bring big changes to overall system performance.
Choose wisely.
OPTOMAN LAB NOTEBOOK
CHALLENGE:
While high laser-induced damage threshold is a buzzword when talking femtosecond & picosecond optics, it is not (only) the nominal LIDT value that matters. The separation of laser damage modes - catastrophic and color-change - is evident when measuring standard optics. The fatigue effect of color-change damage becomes even more significant for high-power mirrors after prolonged radiation (>103 pulses).
TASK:
Color-change effect is an arch-enemy and LIDT-limiting factor for ultrafast applications. It must be eliminated in order to increase the lifetime of the optics.
STATUS:
Completed.
CONCLUSIONS:
Standard mirrors (ULLM5) do a good job in most ultrafast applications, however the most demanding applications require special solutions, i.e. SuperHero League (ULLM5SHL) mirrors.
ILLUSTRATION OF A PROBLEM
The fatigue effect of color-change damage becomes even more significant for high-power mirrors after prolonged radiation (>103 pulses) for standard and high power standard mirrors. Learn more about Why Ultrafast Lasers are so Ultrafast in Damaging Optics here.
Market-Standard Mirrors
Market-Standard 1030 nm mirrors feature >0.3 J/cm2, >0.4 J/cm2, >0.5 J/cm2 and similar values @ 1030 nm, 500 fs, 10 kHz. However, when mirrors are operated at extreme conditions with a big number of laser pulses per single irradiance sites, these mirrors suffer due fatigue and coating color changes. This effect eventually ruins laser beam profile.
Market-Standard High Power Mirrors
Sure "more high power" coating options are available, where catastrophic LIDT value goes above 0.8 J/cm2 @ 1030 nm, 500 fs, 10 kHz. Fatigue (color-change) effect is still there despite higher absolute LIDT.
OPTOMAN SOLUTIONS
OPTOMAN R&D team did a hardcore investigation and developed SuperHero League ULLM5SHL mirrors. Fatigue (color-change) effect is negligible and moreover LIDT got higher.
Standard and SuperHero League Mirrors
Femtosecond LIDT:
> 0.7 J/cm2 @ 1030 nm, 500 fs, 10 kHz, p-pol
Picosecond LIDT:
>3 J/cm2 @ 1030 nm, 10 ps, 10 kHz, p-pol
Femtosecond LIDT:
> 1 J/cm2 @ 1030 nm, 500 fs, 10 kHz, s-pol
Picosecond LIDT:
>5 J/cm2 @ 1030 nm, 10 ps, 10 kHz, s-pol
Spectral Performance
Typical charasteristics of ULLM5 and ULLM5SHL mirrors:
Substrate material: UVFS
Surface quality: 10-5 S-D (MIL-PRF-13830B)
Surface flatness, S1: <λ/10 @ 633 nm over CA
Angle of incidence: 0° or 45° or which ever °
Reflectance: HRs>99.95% & HRp>99.9% @ 1010 – 1050 nm
Group Delay Dispersion: |GDD Rs|<20fs2, |GDD Rp|<50 fs2
Yes, custom bandwidths and higher reflectance values are available.
Reduced absorption
Absorption @ 1064 nm is ~1 ppm for s-pol component and ~2 ppm for p-pol component.
OPTOMAN doesn't stop here...
Keep an eye out for our technological developments that are still in progress. Coatings featuring super high LIDT with no color-change degradation are under development. Enjoy preliminary R&D results.
Resources
In-stock options
If you're interested in standard or in-stock options, feel free to check out SuperHero Power mirrors in OPTOSHOP!