Kerr lens mode locking Ti (Titanium) sapphire laser unit of 488nm laser pumping

Abstract

The invention provides a kerr lens mode locking Ti (Titanium) sapphire laser unit of a 488nm laser pumping. The laser unit is used for outputting the laser of kerr lens mode locking, and comprises a pumping source, a resonant cavity and a Ti sapphire laser crystal, wherein the pumping source is used for providing a pump laser and is an optical fiber laser of which the output wavelength is 488nm; the resonant cavity is defined by a plurality of optical elements, and is used for providing a return optical path, so as to form an oscillating laser in the resonant cavity; the Ti sapphire laser crystal is used as a gain medium and a kerr medium, and is arranged in the resonant cavity. When the pumping source is adopted, the laser unit needs to operate at the lower pumping power to realize the kerr lens mode locking Ti sapphire laser unit, generate a stable mode locking laser pulse of which the pulse width is less than 10fs, and low loss is endowed to the Ti sapphire laser unit. The pumping source is high in reliably and low in requirement of a servo system, the Ti sapphire laser unit is more compact in structure, cheaper in price and lower in noise, therefore, the application of the Ti sapphire laser unit in the fields of science and technology, industry and the like can be greatly promoted.

Description

Technical field [0001] The invention relates to the technical field of lasers, in particular to a 488nm laser pumped Kerr lens mode-locked Ti:Sapphire laser. Background technique [0002] In 1991, Spence et al. realized the Kerr lens mode locking of the Ti:Sapphire femtosecond oscillator for the first time, with a mode-locked pulse width of 60fs. Since then, the ultra-short pulse Ti:Sapphire oscillator has undergone long-term development and improvement. Ti:Sapphire has also become the most widely used mid-infrared crystal. [0003] So far, many different types of pump sources have been used to try to pump Ti:Sapphire: [0004] (1) Argon ion laser, as the earlier pump source for Ti:Sapphire, has the advantages of high pump power, but its low conversion efficiency limits its wide application. Since 2000, there have been few argon ion lasers. Related reports on pumping Ti:Sapphire. [0005] (2) The all-solid-state green laser (output wavelength is 532nm or 515nm) is the most widely us...

AI Technical Summary

Problems solved by technology

But its complex servo system makes the cost of all-solid-state green laser expensive, and its output wavelength is not the absorption peak of titanium sapphire (absorption peak is 488nm)

[0006] (3) The recently appeared LD laser as a pump source can greatly reduce the cost, but its beam quality, output wavelength and output linewidth need to be optimized

[0007] In addition, the existing pump source used for Kerr lens mode-locked Ti:sapphire laser has a high power, generally above 5W. Due to the high power, it may cause multi-pulse phenomenon, which in turn leads to a decrease in the contrast of the pulse, and the mode-locked poor stability, etc.

[0008] There are problems such as high power, high cost, and poor beam quality when the above-mentioned pump source is used in a Ti:Sapphire laser. Therefore, there is an urgent need for a Ti:Sapphire laser that can achieve stable Kerr lens mode-locking and low power. low cost pumping source

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