Passively Q-Switched Dual-Wavelength Laser Operation With Coaxially End-Pumped Composite Laser Materials

Abstract

A passively Q-switched dual-wavelength laser with tunable power ratio and pulse interval is demonstrated based on the coaxial diode end-pumping configuration by varying the pump wavelength. A theoretical model was built by a set of time-domain rate equations illustrating the dynamic process of both the pulse generation of two wavelengths from a shared pump source and a saturable absorber. The simulation showed that both the power ratio and the time interval between the pulses at two resonant wavelengths in the Q-switched mode could be tuned by balancing the gains in two laser crystals by varying the pump wavelength, realized by controlling the working temperature of the pump laser diode. The experiment was performed with Nd:YAG/Nd:YAP composite laser crystals and a Cr 4+ :YAG slice working as the saturable absorber for pulse generation. The continuous-wave and Q-switched total output power reached 5.62 W and 2.12 W, corresponding to overall optical-optical conversion efficiencies of 37.5% and 14.1%, respectively. The manipulation of power ratio and pulse interval between 1064 nm and 1080 nm agreed well with the simulation results.

A passively Q-switched dual-wavelength laser with pulsed LD coaxial end-pumped configuration

“…The output energy and peak power of the dual-wavelength laser gradually decreased when T0 increases, as shown in Table 3. The maximum pulse energy of the dual-wavelength laser reached 304 μJ with R and T0 both at 0.5, higher than the results which used continuous pumping [19]. The temporal waveform of the Nd:YAG/Nd:YAP laser shown in Fig.…”

“…Recently, a laser-diode (LD) end-pumping scheme with a pair of coaxially arranged laser crystals was proposed to realize compact and stable dual-wavelength operation with the freedom to flexibly tune the power ratio of two wavelengths by varying the pump focusing depth or pump wavelength [14][15][16][17][18][19]. However, the pump power is constrained due to the serious thermal effect in the crystal under LD continuous pumping, which limits dual-wavelength laser output of the single pulse energy and peak power.…”

2021 Index IEEE Photonics Journal Vol. 13

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Rate Equations Model to Simulate the Dual Generation of Nd+3: YAG Passive Q-Switched Laser Pulses

“…Passive Q-switching (PQS) lasers technique exhibits many advantages, such as simple structure, small size, low coast, improved durability and reliability, and does not require complex extra-cavity modulation devices. It produces short pulses and high peak powers (1,2) that have made it widely applied. The applications of this technique are: high-precision processing, laser medical treatment, space detection, radar, and laser communication (3)(4)(5) .…”