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US 2026/0259471 A1Published application
Blue laser operating at the h-beta fraunhofer line
AssigneeAqwest LLC
InventorsJan Vetrovec, David M. Filgas
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AssigneeAqwest LLC
InventorsJan Vetrovec, David M. Filgas
Estimating the term…
The present invention provides a blue laser transmitter operating at the H-beta Fraunhofer line at 486.13 nm wavelength. The subject blue laser is based on pulsed lasing action in thulium doped into lutetium sesquioxide (Tm:Lu2O3). The laser wavelength is restricted by volume Bragg grating to the vicinity of 1944 nm wavelength. The laser is operated with a q-switch to generate high-energy pulses with in the nanosecond regime. The output at the 1944 nm wavelength is then frequency quadrupled in a single pass through non-linear crystals to a wavelength near the center of the H-beta Fraunhofer line. The operation at the 1944 nm wavelength in Tm:Lu2O3 is very efficient because this wavelength is located on a shoulder of a substantially broad emission peak at 1945 nm. In addition, at the 1944 nm wavelength, Tm:Lu2O3 has only a modest saturation fluence of about 15 J/cm2, which allows for efficient energy extraction.
1 A blue laser system comprising a laser source and a frequency quadrupling system (FQS);
The blue laser system of claim 1, wherein said laser gain material is in a ceramic form.
The blue laser system of claim 1, wherein said laser source further includes a power amplifier.
The blue laser system of claim 1, further including a TEC in good thermal contact with said VBG.
The blue laser system of claim 1, further including a pump module for generation of pump light;
The blue laser system of claim 1, wherein said volume Bragg grating is arranged to restrict said lasing to the wavelength band of <0.2 nm.
The blue laser system of claim 1, wherein said laser oscillator is operated with the q-switch to generate a train of 10-30 nanosecond pulses.
10 The blue laser system of claim 1, wherein said FQS comprises a non-linear crystal arranged to frequency double said output at said 1944 nm wavelength to the vicinity of 972 nm wavelength in a single pass through said crystal.
11 The blue laser system of claim 1, wherein said wherein said FQS comprises a non-linear crystal arranged to frequency double said 972 nm wavelength to the vicinity of 486 nm wavelength in a single pass through said crystal.
A blue laser system comprising a laser source and a frequency quadrupling system (FQS);
A method of generating narrow band coherent laser radiation with wavelength centered at 486.13 nm corresponding to the Fraunhofer H-beta line comprising the steps of:
Dependencies are inferred from the claim text.