Intra-cavity pulse compression in passively mode-locked Nd-glass lasers

Abstract

The spectral gain width of a passively mode-locked Nd-phosphate glass laser is reduced with a birefringent filter, and towards the end of the pulse train self-phase modulated pulses are temporally compressed by the restricted gain width. Short pulses upon broad pedestals are formed. The wings are reduced by passing the pulses through an external saturable absorber. Under favorable conditions the pulse durations are shortened from about 7 ps to about 1.5 ps.

Compression of picosecond light pulses of a hybridly mode-locked pulsed Nd : glass laser

“…The frequency chirping by seif-phase modulation [1-10] and the subsequent compression by dispersive (gratings [11][12][13][14][15][16][17][18][19][20], prisms [19][20][21][22][23][24], gratingprism combinations [20,25,26]) or absorptive (gain bandwidth limiting [27][28][29][30][31][32][33]) arrangements is widely applied to shorten picosecond or femtosecond light pulses. So far the shortest optical pulses (wavelength around 620 nm) of 6 fs duration have been generated by chirping pulses (input duration %50 fs) in a single-mode optical fiber and subsequently compressing them in a grating pair and four prism arrangement [25,26].…”

Pulse-shape determination of intracavity compressed picosecond pulses by two-photon fluorescence analysis

“…8 belong to a passively mode-locked Nd-glass laser. The pulse compression of the self-phase modulated pulses was achieved by insertion of a birefringent filter into the laser oscillator [6]. The solid curve in Fig.…”

“…In recent experiments self-phase modulated picosecond pulses in modelocked lasers have been compressed by the finite gain width of the active medium [4][5][6][7][8]. These intracavity compressed pulses consist of a short spike upon a broad pedestal.…”

Passive Q-switching and mode-locking for the generation of nanosecond to femtosecond pulses

“…The chirped pulses may be compressed by bandwidth-limiting filtering of the active medium [32,121,159,[175][176][177][178] inside the oscillator or by dispersive effects in grating pairs, prism pairs, or grating-prism combinations outisde the oscillator [179,180].…”

“…The intracavity pulse compression of chirped pulses in a passively mode-locked laser by the finite spectral gain width of the active medium has been discussed in Sect. 3a [32,121,159,[175][176][177][178].…”