By analysing energy level structure of BDN dye in combination with rate equations, the authors point out the possibility of realizing passive mode-locking by using BDN dye film with relaxation time of ground state in nanosecond magnitude.

The experimental observation of blue-chirped pulses for passive mode-locking is found to be due to the different contributions of gain and absorber media to the calorific-effective parameters change.

The passive mode-locking operation of a flash-lamp pumped Nd∶YAG laser was achieved by inserting the nc-Si-SiNx film as the saturable absorber i.

Femtosecond passively mode-locked Er~(3+)-doped fiber ring laser;

Study on passively mode-locked erbium-doped fiber laser by means of NALM;

A passively mode-locked fiber ring laser with a small segment of Er3+-doped fiber as gain medium,pumped by stable 976 nm laser diode(LD) and mode-locked by the nonlinear polarization rotation(NPR) technique,was successfully achieved.

With Cr 4+ ∶YAG as saturable absorber in Nd∶YAG laser,both passive Q switching and passive mode locking can be realized by changing the length of cavity.

The passive mode locking in a pulsed Nd∶YAG laser with a plane concave cavity by using Cr 4+ ∶YAG as the saturable absorber was achieved.

Using the NACLM and a bulk semiconductor saturable absorber, stable passive mode locking in an erbium doped fiber laser can be obtained.

Theory of the self-starting passive mode-locked Yb~ 3+ -doped fiber ring laser generating short pulses is presented.

The thesis researched a kind of passive mode-locked laser apparatus.

Optical short-pulsed lasers offer a broad range of applications in various fields,such as Q regulation,radio saturation and absorption lens,passively mode-locking and carbone monotubes,etc.

The mechanism of active passive mode locking soliton laser is analysed.