Well, sounds like you're not quite sure what is going on with why lasers can harm your eye.
How bright a laser is (simply) based on how much power it puts out and how sensitive your eye is to the wavelength of light it emits. You can't "filter" out the ability to harm your eye with a single wavelength of light without decreasing power.
HOWEVER, what you are probably thinking about are DPSS systems, which use an infrared wavelength of light to pump crystals which then emit another wavelength (like 532nm-green, or 473nm-blue, etc), but also don't emit/pass a pure wavelength and can still have some infrared mixed in, which you can't see (not very well, anyway). The power of that infrared light can be as powerful or even more powerful (potentially much more) than the visible wavelengths. In that case, you could filter the infrared and not (significantly) decrease the power of your desired wavelength. But, that still doesn't make it "safe". Depending on the power output of the visible wavelength and other factors like the scanning speed and divergence, like mentioned, it can still injure your eye with exposure.
Now, with Blu-ray lasers or other diode lasers (ie directly emitted by the diode), the light is of one wavelength (well, mostly), so there is nothing that can be filtered to prevent eye damage unless you actually decrease the overall power output of the laser, which is what protective eyewear does.
So, if you want to make your laser "eye safe", get some protective goggles or don't turn it on
And, don't forget that goggles only make YOU safe, not others (unless they have goggles too).
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