Safe laser light

A laser based light source comprising;

• a gallium and nitrogen containing laser diode configured as an excitation source;
• the laser diode configured with a gallium and nitrogen containing active region positioned between an n-type gallium and nitrogen containing cladding region and a p-type gallium and nitrogen containing cladding region;
• the laser diode configured with electrode members to receive an electrical input current from a power supply, through a transistor, to supply electrical carriers and generate an excitation laser light within the active region;
• the excitation laser light is characterized by a first wavelength in a 385 nm to 425 nm violet range or a wavelength in a 425 nm to 485 nm blue range;
• the laser diode comprising a first end and a second end to form a cavity region wherein the first end is configured as a first mirror and the second end is configured as a second mirror;
• the first mirror and the second mirror configured to provide optical feedback to the cavity region to achieve a threshold condition with the electrical input to the laser diode and enable operation of the laser diode as a laser light source;
• one or more phosphor wavelength conversion members;
• the one or more phosphor wavelength conversion members comprising a first surface and a second surface;
• the one or more phosphor wavelength conversion members configured to convert the first wavelength to light with one or more longer wavelengths;
• an inherent safety design feature;
• the inherent safety design feature comprising one or more sensor members configured with a closed loop feedback to the laser diode;
• the one or more sensor members configured for a detection of an optical deviation in the laser based light source upon a removal, damage, or compromise to the one or more phosphor wavelength conversion members;
• wherein the optical deviation comprises an increase or decrease in the power of the excitation laser light at the first wavelength or an increase or decrease in the power of one or more phosphor converted wavelengths of light;
• wherein the detection of the optical deviation initiates a modification or reduction to the laser diode electrical input current;
• the modified or reduced electrical current input to the laser diode configured to prevent the laser based light source from achieving the threshold condition and thereby prevent the laser based light source from operating as a laser light source;
• wherein the inherent safety design feature is a self-contained feedback loop comprising the transistor and the one or more sensor members;
• wherein the one or more sensor members comprises a photodiode;
• wherein the transistor is configured to pass current from the power supply to the laser diode while the photodiode detects light of the one or more longer wavelengths by inducing a reverse current flowing from a base terminal of the transistor;
• and
• wherein the transistor is configured to shut off current from the power supply to the laser diode while the photodiode does not detect light of the one or more longer wavelengths by not inducing the reverse current flowing from the base terminal of the transistor.