Telescopic Amplifier Research Articles

High-power neodymium phosphate glass telescopic amplifier of single-pulse radiation

An experimental investigation was made of a five-pass telescopic amplifier with a phototropic switch in its resonator. The use of GLS-21 phosphate glass made it possible to increase the energy of single-pulse radiation to 90 J and the energy efficiency was 0.5%. The angular divergence of the radiation measured at 0.7 of the maximum energy level was 0.18 mrad and it was limited by optical inhomogeneities of the active element in its cold state. An analysis was made of possible configurations of a telescopic amplifier with a switch in its resonator. A simple model was developed for calculating the energy characteristics of such amplifiers on the basis of the available experimental results.

Angular characteristics of neodymium laser radiation after wavefront reversal by three-wave parametric interaction

An investigation was made of the angular characteristics of the output radiation of a neodymium-glass laser system with wavefront reversal by a three-wave parametric interaction. A telescopic amplifier with a gain of ~ 103 was used in the system. The proportion of the reversed radiation was 30% when the pump radiation divergence was close to the diffraction limit. The half-width of the angular distribution of the radiation energy at the output of the system was 10−4 rad. The reasons for failure to achieve complete reversal were analyzed.

Investigation of the characteristics of a three-pass amplifier utilizing a neodymium glass plate

An experimental investigation was made of the energy characteristics of a three-pass telescopic amplifier with an active element made of neodymium glass. A simplified model calculation was made of the process of amplification of a short laser pulse in such an amplifier forming a part of a complex optical system. The high output energy (300 J) and gain achieved experimentally demonstrated the usefulness of such amplifiers in the output stages of high-power laser systems.

Design of multipass telescopic amplifiers for a cw chemical HF laser

The results are given of calculations (carried out within the geometric optics approximation) of the energy parameters of multipass telescopic amplifiers for a cw diffusion HF laser. A brief description is given of the calculation method. Two known types of telescopic amplifier are compared with a conventional single-pass configuration. The dependences of the output parameters on the input signal, resonator gain, and coupling coefficient are investigated.

Calculation of energy characteristics of multipass telescopic amplifiers

The geometric approximation is used in a calculation of the energy characteristics of a telescopic amplifier containing a medium characterized by a homogeneously broadened lasing transition line. The calculations are carried out for a wide range of values of the input signal intensity, resonator parameters, and number of passes through the active medium.

A gigawatt CO2 laser with telescopic amplifier

The first production of gigawatt pulses form a 1-m CO2 telescopic amplifier with megawatt input is reported. This device has been used to generate 1-J pulses of 830 ps FWHM from a suitably gated source.

Design of telescopic high-gain amplifiers

Design of telescopic high-gain amplifiers