Q-switched holmium laser

Abstract

The invention discloses a Q-switched holmium laser. The Q-switched holmium laser comprises a composite resonant cavity, a Tm / Ho composite gain medium, a Q-switched element and a pumping source; the composite resonant cavity comprises a laser resonant cavity and a filtering resonant cavity; the filtering resonant cavity and the Q-switched element are sequentially positioned in the laser resonant cavity along the light path direction; the Tm / Ho composite gain medium is located in the filtering resonant cavity; the pumping source is positioned outside the laser resonant cavity; wherein the filtering resonant cavity is used for separating Tm laser from Ho laser. The laser comprises a composite resonant cavity, the composite resonant cavity realizes separation of Tm laser and Ho laser, and theTm laser is confined in a filtering resonant cavity, so a Q-switched element only influences the Ho laser, and the Tm laser can effectively excite the Ho laser to form stable Q-switched pulse output.

Description

technical field [0001] The present application relates to a Q-switched holmium laser and the field of solid-state laser technology. Background technique [0002] In the existing all-solid-state holmium (Ho) laser implementation, compared to the bulky Tm laser pumping the Ho laser, the expensive 1.9 μm semiconductor laser LD pumps the Ho laser, and the complex structure of the Tm laser resonator pumps the Ho laser. Laser, Tm / Ho bonding laser is a compact, miniaturizable, economical and convenient way to realize Ho laser. It can directly use conventional LD ​​(wavelength 750nm~810nm) to efficiently realize room temperature Ho laser output. However, the Tm-doped part and the Ho-doped part in the bonding gain medium interact with each other. The Tm-doped part not only provides the Tm laser for pumping the Ho-doped part, but also acts as a saturable absorber for the Ho laser. The Ho-doped part consumes the Tm in the cavity. At the same time, the laser energy is equivalent to the...

AI Technical Summary

Problems solved by technology

However, the Tm-doped part and the Ho-doped part in the bonding gain medium interact with each other. The Tm-doped part not only provides the Tm laser for pumping the Ho-doped part, but also acts as a saturable absorber for the Ho laser. The Ho-doped part consumes the Tm in the cavity. The laser energy is also equivalent to the saturated absorber of the Tm laser, which affects the time stability of the Tm pump light in the cavity

[0003] The above situation has caused the Tm / Ho bonding laser to have a messy pulse signal in the free running state, and it is impossible to use the traditional active Q-switching method (that is, inserting acousto-optic or electro-optic in the resonant cavity of the Tm / Ho bonding laser) modulation device) to generate a stable Q-switched pulse output

On the other hand, the traditional passive Q-switching method of directly inserting a saturable absorber in the resonator is also difficult to achieve laser output on the Tm / Ho bonded laser, because the introduction of the saturable absorber increases the loss of the resonator, which is harmful to Ho lasers, especially the Tm lasers pumped in the cavity with Ho-doped parts, cause loss and cannot form laser oscillation output.

That is to say, because there are both Tm laser and Ho laser in the cavity, the Q-switching element weakens the Tm laser, so that the Ho laser cannot be fully excited by the Tm laser, and cannot form an effective Ho laser output.

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