The single most important performance characteristic required when considering lasers for holographic applications is long coherence length, in addition to good power stability, wavelength accuracy and stability, and, above all, excellent reliability…
Reliability is the single, most important characteristic
This is by far the most important performance characteristic to consider when writing a hologram or HOE. A coherence length >1 m is typically sufficient for writing holograms. A laser with long (temporal) coherence length (>100´s m) has a linewidth of < 1 MHz and is referred to as single longitudinal mode (SLM) or single frequency (SF).
Fixed or tunable wavelength lasers, being either diode pumped lasers, frequency doubled OPOs, frequency stabilized diode lasers and frequency converted fiber lasers, either operating CW or pulsed can be used for writing holograms and holographic optical elements (HOEs). The single most important performance characteristic required is long coherence length, in addition good power stability, wavelength accuracy and stability and above all excellent reliability…
Read the full article here: NOVUS LIGHT
Written by E.K. Illy, H. Karlsson & G. Elgcrona
Cobolt AB, a part of HÜBNER Photonics