Analysis on preferential free running laser wavelength and performance modeling of Tm³⁺-doped YAP and YLF

Abstract

The preferential free running laser wavelength at room temperature for different axes cuts of Tm³⁺-doped YAP and YLF is comparatively analyzed in this paper. The polarized gain spectrum of Tm:YAP and Tm:YLF with different product values of Tm³⁺-doped concentration and crystal length is theoretically calculated under various cavity output mirror transmissions. From the gain spectrum, it straightforwardly determines the preferential free running laser wavelength for a given light polarization. In addition, a rate equation model is further used to model and compare the laser output performance for both the free running and some common artificially selected oscillating wavelengths, including 1.99 and 1.94 μm of Tm:YAP, and 1.89, 1.91, and 1.94 μm of Tm:YLF, respectively. To achieve an expected laser oscillating wavelength with acceptable output performance, our analysis presented here is very beneficial for one to choose the most suitable axis cut of crystal.

Experimental and Modeled Output Characteristics of a Compact, Passively Q-Switched Tm:YLF Laser

“…This best-case value is lower than 1.88, cited in [19]. Direct spontaneous emission from the initial excited pump level is ignored.…”

CW and Q-switched operations of a Tm3+:YAP laser at 1892–1994 nm In-band fiber-laser pumped at 1670 nm

“…The fist mechanism is very simple: OC1 had the reflection minimum at ∼1960 nm that discriminated the operation at 1940 nm; while OC2 had the flat reflection spectrum with the weak 5-% changes at 1890-2000 nm (figure 3). The second mechanism has a more complicated explanation: the Tm 3+ :YAP crystal under in-band pumping can be identified as a quasi-three-level active medium due to a small Stark splitting of the low level manifold 3 H 6 of the laser transition 3 F 4-3 H 6 [5,6,38]. As a consequence, the absorption and emission cross-sections of the Tm 3+ :YAP for all eigenwaves have an overlapping at 1800-2000 nm (figure 11), and the effective gain cross section G of the laser depends on the inversion fraction β:…”

Layered Metallic Vanadium Disulfide for Doubly Q-Switched Tm:YAP Laser with EOM: Experimental and Theoretical Investigations

“…To understand the Q-switching mechanism based on the SA and EOM, a coupled rate-equation model with plane wave approximation is proposed, as follows [12,[38][39][40][41]:…”