The linewidth of continuum wave laser is the width (typically the full width at half-maximum, FWHM) of its optical spectrum. :inewidth is often discussed in terms of frequency, wavenumber or wavelength and can be expressed in different unints including Hertz (kHz, MHz, GHz etc...), inverse centimeters (cm-1) or nanometers or picometers (nm, pm).
Relations between differnt units for typical wavelength of Ti:Sapphire laser 800 nm are as follows:
Δλ = - (c/ν2) *Δν = - λ * Δν/ν
where c is the speed of light 3*108 m/s and ν is the frequency of light at that wavelength
for λ = 800 nm ν = 375 THz
So for Δν = 1 GHz = 109Hz Δλ = 800 nm * 2.67*10-6 = 2.13 * 10-3 nm = 2.13 pm (picometer)
For CW Ti:Sapphire laser TRESTLES CW LH (Ti:Sapphire CW oscillator) which is
typically tunable in the range 700 - 1000 nm the typical linewidth is:
<45 GHz - with birefringent filter only - corresponds to 96
picometer at 800 nm
<20 GHz (with 1 etalon) - corresponds to 42.6 picometer at 800 nm
<2 GHz (with 2 etalons) - corresponds to 4.26 picometer at 800 nm
So, even with birefringent etalon only the linewidth is less than 0.1 nm which is enough for the most fluorescence spectroscopy applications in condenced matter.
Tunable Titanium: Sapphire Continuous Wave Laser Trestles LH CW
Del Mar Photonics offers new
Trestle-LHs fs/CW laser system which can be easily
switched from femtosecond mode to CW and back.
Having both modes of operation in one system dramatically increase a number of
applications that the laser can be used for, and makes it an ideal tool for
scientific lab involved in multiple research projects.
Del Mar Photonics offers variety of continuum wave Ti:Sapphire lasers with linewidth from 45 GHz down to 5 kHz, output power from few hundred mW to 3 Watt. We also offer a combination of CW-femtosecond laser in one convinient to operate package.