Fiber-based laser frequency combs

Abstract

Abstract. For the last decade a very attractive field of laser physics, namely the optical frequency comb technique, has been intensively developed. Fiber lasers play particular role in that area. The motivation of their development is obtaining broadband comb systems with well-defined and stable mods (comb teeth). This paper presents a basic overview devoted to the fiber-based optical frequency combs.

Recent Advances, Applications, and Perspectives in Erbium-Doped Fiber Combs

“…In recent years, optical frequency combs have tremendously progressed from a complex desktop system to a compact chip-level device [1][2][3]. Many advantages of optical frequency combs have promoted the development of different technical fields that include optical two-way time-frequency transfer [4][5][6], high-precision laser ranging [7][8][9][10][11][12], atomic clock networks [13][14][15], absolute frequency measurement [16][17][18], wavelength calibration of astronomical spectrographs [19,20], and low-noise microwave generation [21][22][23][24][25].…”

Active glasses as the luminescent sources of radiation for sensor applications

“…Moreover, in co-doped materials such processes may take place, among others, as energy transfers resulting in the appearance of emission bands with wavelengths shorter than the pumping wavelength (i.e. upconversion) [1][2][3][4][5][6][7]. Donor-acceptor energy transfer processes depend on many factors which must be optimized in order to achieve the assumed emission band.…”

“…For instance, the efficiency of upconversion is largely dependent on the type of used matrix, and in particular on the energy of phonon vibrations. Specifically, the lower the maximum lattice vibrations frequency hω max , the higher the probability of excitation energy conversion [7][8][9][10][11]. Among the materials with low phonon energy are fluoride glasses [12] or HMO (Heavy Metal Oxide) glasses [13], whose phonon vibrations (300-600 cm −1 ) preclude the occurrence of unwanted nonradiative decays.…”