Yes, there are scientific lasers known as tunable infrared lasers that can operate within a range of wavelengths, allowing for adjustable wavelengths within specific limits. These lasers are designed to emit light in the infrared (IR) region of the electromagnetic spectrum.
One common type of tunable infrared laser is the optical parametric oscillator (OPO). An OPO can generate coherent light over a wide range of wavelengths by using a non-linear crystal and an input pump laser. By adjusting the crystal properties and the pump laser parameters, the OPO can be tuned to emit light within a desired wavelength range.
Another type of tunable infrared laser is the external cavity diode laser. These lasers use a diode laser chip as the gain medium and employ an external cavity, which typically includes a diffraction grating or other tuning elements. By adjusting the cavity length or the grating angle, the laser wavelength can be tuned over a certain range.
There are also other techniques and technologies for achieving tunable infrared lasers, such as quantum cascade lasers, dye lasers, and titanium-sapphire lasers. Each of these methods offers different ranges and mechanisms for wavelength tuning.
It's worth noting that the specific range of wavelengths and the tuning capabilities of a tunable infrared laser depend on the design and specifications of the laser system. Different lasers have different tuning ranges and limitations. Therefore, if you require a specific tunable infrared laser with an adjustable wavelength range of 900 nm up to 1500 nm, you would need to consult laser manufacturers or research specific laser systems that meet your requirements.