Very-high-efficiency (80%) Raman amplification of a narrow-band injected Stokes signal has been achieved in the case in which pump and Stokes linewidths are both narrower than Raman transition width. Under such conditions, the Stokes-beam amplification is obtained without line broadening, permitting the creation of widely tunable powerful monochromatic sources when tunable lasers are used. With fixed-frequency pump lasers, tunability within the Raman linewidth has also been demonstrated. With a pump linewidth much broader than that of the injected Stokes signal, a spectral compression rate up to 16 has been achieved by using this Raman amplification technique.
© 1980 Optical Society of America
Original Manuscript: May 28, 1980
Published: September 1, 1980
R. Frey and F. Pradère, "High-efficiency narrow-linewidth Raman amplification and spectral compression," Opt. Lett. 5, 374-376 (1980)