| abstract |
This application involves laser technology fields, disclose a kind of narrow linewidth adjustable extemal cavity laser, including laser gain chip, collimation lens, band pass filter, tunable filter and the output Cavity surface set gradually.The laser gain chip includes the first end face and second end face in optical path；The first end face is relatively distant from the collimation lens, is coated with high-reflecting film, forms exocoel with output Cavity surface.The application realizes small-scale Wavelength tunable using tunable filter cooperation band pass filter, reduces the device in exocoel, to reduce Insertion Loss, shortens that chamber is long, increases the interval of outer cavity film, wavelength locking is not easy mode hopping；By the relationship being rationally arranged between the free transmission range of band pass filter and the Free Spectral Range and external cavity mode of tunable filter, the unimodal laser output of narrow linewidth can be realized. |