Erbium-doped wedge-shaped waveguide amplifier capable of achieving high efficiency, large energy and small size

Abstract

The invention discloses an erbium-doped wedge-shaped waveguide amplifier capable of realizing high efficiency, large energy and small volume. A wedge-shaped double-cladding erbium glass waveguide structure is used, pump light is fully absorbed after passing through a gain medium for multiple times, and the absorption length and the absorption uniformity of the gain medium are increased, so that the heat effect is improved, and the pump absorption efficiency is effectively improved. A gain medium wraps the four sides of a material which absorbs 1.5 microns and does not absorb pump light, so that a self-excited oscillation loop is cut off, the influence of ASE is improved, the energy storage efficiency is improved, and the output laser energy is improved. The novel waveguide structure is small in size and compact in structure. The inner cladding and the outer cladding play a role of heat sink for the erbium glass, so that the gain medium can better dissipate heat, the temperature gradient of the center and the side surface of the gain medium is effectively improved, the heat effect is reduced, and high-energy output is realized. The amplifier gain medium is prepared by adopting a bonding technology, so that the whole structure of the amplifier is simpler and more compact, and integration and structural miniaturization are easy to realize.

Description

technical field [0001] The invention relates to a high-efficiency, high-energy, small-volume erbium-ytterbium co-doped phosphate glass waveguide narrow pulse amplifier. A new structure was designed, including pump effective absorption structure, ASE suppression structure, and a new waveguide amplifier was formed by bonding between Erbium-ytterbium co-doped phosphate glass, cobalt-doped silicate glass and K9 optical glass. The invention belongs to the technical field of solid laser amplifiers. Background technique [0002] The 1.5μm laser is in the "safe wavelength for human eyes", has a high allowable exposure to the human eye, is in the "atmospheric window", and has a strong penetrating ability to smoke and fog, and has become an important laser wavelength in the field of laser ranging. The 1.5μm laser using erbium glass (Er:Yb:glass) as the gain medium has become a laser for civil and military distance measurement due to its small size, high conversion efficiency, and low...

AI Technical Summary

Problems solved by technology

However, among several amplifiers that realize eye-safe lasers, the erbium-doped fiber amplifier has a strong nonlinear effect and a large size, which restricts its application in small-scale ranging; side diode-pumped rod-shaped, Square columnar amplifiers are not suitable for small-sized ranging applications due to their large size and severe thermal effects; end-pumped rod-shaped and square columnar amplifiers have high incident end surface optical power density, which results in serious thermal lens effects. Limits the increase in output power

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