Miniature mid-infrared self-optical parametric oscillator directly pumped by diode laser

Abstract

The invention discloses a miniature mid-infrared self-optical parametric oscillator directly pumped by a diode laser. The miniature mid-infrared self-optical parametric oscillator comprises a short-focus lens which is used for adjusting the size of a diode laser spot, a composite total reflective mirror and a composite output mirror which are used for forming a resonant cavity of the self-opticalparametric oscillator, and therefore, the composite crystal can simultaneously realize fundamental frequency optical gain and nonlinear frequency conversion laser output. The composite crystal is arranged between the composite total-reflection mirror and the composite output mirror, the short-focus lens is arranged on the side, away from the composite crystal, of the composite total-reflection mirror, diode laser is input from the end of the short-focus lens, the size of a light spot is adjusted through the short-focus lens, and then the diode laser enters the composite crystal through the composite total-reflection mirror. Effective output of the mid-infrared laser is realized under the action of the composite crystal and the resonant cavity of the self-optical parametric oscillator. Theself-optical parametric oscillator has the remarkable advantages of being small in size, light in weight, simple in optical configuration, reliable in system and the like, and the problem that an existing intermediate infrared solid laser technology is complex in structure and difficult to achieve small size and light weight is solved.

Description

technical field [0001] The invention belongs to the field of lasers, in particular to a miniature mid-infrared self-optical parametric oscillator directly pumped by a diode laser. Background technique [0002] The 3-5μm mid-infrared solid-state laser has a wide range of application scenarios, such as photoelectric interaction, atmospheric monitoring, molecular spectroscopy, laser medical treatment, frontier science, etc., and plays an important role in national defense, scientific research and civilian fields. At present, there are two main technical approaches to achieve 3-5μm mid-infrared solid-state laser output: 1. Direct lasing mid-infrared solid-state lasers based on energy level transitions, such as solid-state lasers doped with Er, Fe, Cr, and Dy, whose output The wavelength or pump wavelength is strictly limited by the energy level structure of doped ions; 2. The optical parametric oscillator (OPO) based on nonlinear frequency conversion has a wide range of output l...

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Problems solved by technology

[0005] At present, there are relatively few research reports on mid-infrared Self-OPO technology at home and abroad, mainly focusing on basic research stages such as crystal production, parameter characterization, performance evaluation, and light-emitting principle verification, while research on mid-infrared laser sources for small platforms It is still blank, and there has not been any report on the miniaturization and weight reduction of mid-infrared self-optical parametric oscillators

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