|Jul10-12, 02:11 PM||#1|
External Cavity Laser
How does an external cavity laser produce ultra narrow line width when it's larger cavity should reduce the free spectral range and thus introduce more longitudinal modes?
|Jul11-12, 07:45 AM||#2|
The external cavity lasers I am familiar with are diode lasers that have an external diffraction grating and vertical-cavity surface emitting lasers that use an external distributed Bragg reflector:
The external diffractive element provides the mechanism for narrowing the linewidth.
|Jul16-12, 02:47 PM||#3|
Thanks for your reply. My understanding was that the diffraction grating just provided a means of tuning the central wavelength. I thought that perhaps the fact that the cavity was external was the key to offering ultra narrow linewidth ... although seems counter intuitive since a shorter cavity would promote fewer longitudinal modes.
|Similar Threads for: External Cavity Laser|
|Maxwell in Laser cavity||Classical Physics||1|
|Laser Cavity||Quantum Physics||11|
|Tunable External Cavity Diode Laser||Electrical Engineering||6|
|Laser Cavity Length||Advanced Physics Homework||0|
|laser cavity lifetime||Advanced Physics Homework||0|