Small constant-temperature air-cooling repetition-rate DPL (Diode Pump Laser) without TEC (ThermoElectric Cooler)

Abstract

The invention provides a small constant-temperature air-cooling repetition-rate DPL (Diode Pump Laser) without a TEC (ThermoElectric Cooler) and aims at providing the DPL laser, which has stable pulse repetition rate, large laser energy output and high reliability and is capable of reliably working under the high or low temperature environment of -40 DEG C to +65 DEG C and a certain impact vibration environment. The DPL laser is implemented through the technical scheme as follows: an output mirror and a holophote are arranged on one titanium alloy metal frame structure surface, and are located on one face of a 180-degree fold resonator and the other end of a titanium alloy frame body, and a tetrahedral prism with three mutually vertical surfaces is taken as a 180-degree light path folded mirror; a diode laser array pumping source is quickly heated in an area from the low temperature to the normal temperature, namely -40 DEG C to +39 DEG C, by a ceramic heating element under an air-cooling fin; when the diode laser array pumping source is heated to a normal working temperature range, a temperature sensor carries out motion control on the ceramic heating element to stop heating; when the temperature of the diode laser array pumping source is higher than +70 DEG C, the diode laser array pumping source is quickly cooled by a high-speed cooling fan under a heat sink of the diode laser array pumping source.

Description

technical field [0001] The invention relates to a non-TEC constant temperature small air-cooled repetition frequency DPL laser working in a high and low temperature environment Background technique [0002] With the technological progress of all-solid-state lasers towards ultra-high power development, the total power of core components has increased significantly, but the physical size has been required to be miniaturized, and the heat flux has also increased, requiring more effective thermal control; working materials The thermal effect of solid-state lasers also limits the development of solid-state lasers to higher power, and effective thermal control of working substances has always been the focus of attention. The all-solid-state laser DPL (Laser Diode-Pumped Solid-State Laser) has developed rapidly in recent years due to its advantages that traditional lamp-pumped solid-state lasers cannot match, such as high conversion efficiency, good beam quality, long working life,...

AI Technical Summary

Problems solved by technology

As far as the all-solid-state laser system is concerned, the scope of thermal management mainly includes the thermal management of the pump source, laser working medium, driving source, and auxiliary components (such as harmonic generators). The thermal management problems of the laser working medium are mainly manifested in the working The thermal effect of matter in the pumping process: while the pump source provides the energy required to generate laser light to the solid-state laser medium, it causes useless heat in the medium

However, the disadvantages of TEC constant temperature are that the cooling efficiency of TEC is low, less than 40%, and the remaining 60% needs to be taken away as waste heat, which undoubtedly increases the burden of power consumption and heat dissipation; secondly, when TEC works in cooling state, The heat generated at the hot end must be taken away in time, otherwise the cooling efficiency of the TEC will be greatly reduced; the heat at the hot end of the TEC will be transferred to the cooling end instantly, resulting in the failure of TEC temperature control, the temperature drift of the diode laser array pump source, and the DPL laser will be useless. Laser output; when the temperature is too high, it is easy to damage the DPL laser, which is especially serious in small airborne sealed pods

If the heat dissipation volume of the TEC hot end is increased, the volume and weight of the entire laser will be increased, and the technical indicators cannot be met.

In addition, another disadvantage of TEC temperature control is that at a low temperature of -40°C, the DPL laser is required to start emitting laser light quickly, because the heating efficiency of the TEC is low at this time, and it usually takes a few minutes to reach the effective working temperature of the pump source. , so that the laser can be emitted, which restricts the application range of the laser

The output mirror and the total reflection mirror located at both ends of the laser resonator of the solid-state laser are usually installed on different metal structures. Reliable work under high and low temperature of ~+65°C and shock and vibration environments

Images