Structure and configuration of the passively Q-switched diode end-pumped solid-state laser

A configuration of a passively q-switched diode end-pumped solid-state laser, comprising:

• a laser base attaching optical elements along an optical axis of a diode laser source to form a laser transmitter;
• the diode laser source is a pulsed laser source configured to generate a pump laser beam with a center wavelength in a range of 900 nm-1000 nm, which can generate pulsed laser with a peak power in a range of 20 W-120 W, a pulse width in a range of 2 ms-5 ms, and a pulse repetition frequency in a range of 1 Hz-10 Hz;
• coupling lenses which are responsible for guiding the pump laser beam from the diode laser source into a gain medium in a resonator cavity, positions of the coupling lenses are varied axially to control a diameter, DB, or cross-section dimensions, a, b, of the pump laser beam entering the gain medium in a range of 0.5 mm-1 mm;
• the resonator cavity comprising, an input coupler which has an anti-reflective coating for the pump laser beam and a highly reflective coating for radiations emitted in the resonator cavity, which possess a desired laser emitted by the gain medium, wherein the input coupler comprises an individual coupler or a coating directly on an end-side of the gain medium;
• an intracavity holder attaching the gain medium and a Q-switch, wherein the intracavity holder is precisely mounted on the laser base, the Q-switch is placed perpendicularly or at a Brewster's angle to an optical line, wherein the Q-switch is placed separately or coated directly on another side of the gain medium that is opposite to the input coupler, the optical line is defined as a line perpendicular to the input coupler and output coupler which simultaneously is a symmetry axis of the gain medium;
• the gain medium is made of a lass doped with ions Er3+ and Yb3+, wherein a laser beam with the desired wavelength will be emitted under the excitation by the pump laser beam,
• the Q-switch comprises a passive Q-switch is made of Co2+:MgAl2O4 crystal as a laser on/off switch and is placed perpendicularly or at Brewster's angle to the optical line in the resonator cavity,
• the output coupler is coated to allow the laser beam to transmit partially, a part of the laser beam is reflected into the resonator cavity while a remaining part of the laser beam exits from the resonator cavity with a desired pulse energy.