A computer system comprising: a multi-section laser (300A; 300B; 400; 920A) of a length that includes a gain/modulation section (330A; 350) and a pre-bias section (330B; 355), both sections electrically connected to a diode laser resonator (315; 345) and both sections are independently controllable via laser driver circuitry; one or more processors; and one or more computer-readable hardware storage devices having stored thereon computer-executable instructions that are executable by the one or more processors to cause the computer system to control the laser driver circuitry to reduce a turn-on delay of the multi-section laser while enabling the multi-section laser to generate laser light having a spectral linewidth satisfying a threshold linewidth requirement by causing the computer system to: apply at least a minimum threshold amount of pre-bias current to the pre-bias section, wherein the at least the minimum threshold amount of pre-bias current, when applied, causes photons to be spontaneously emitted, and wherein wavelengths of the spontaneously emitted photons span at least a determined range of wavelengths as a result of the at least the minimum threshold amount of pre-bias current being applied; refrain from applying a gain current to the gain section until the diode laser resonator is seeded with a spectrum of photons from the pre-bias section; and after the diode laser resonator is seeded with the spectrum of photons, apply the gain current to the gain section to generate a seeded pulse of laser light having a determined optical intensity, wherein the seeded pulse of laser light is generated using at least some of the spectrum of photons that seeded the diode laser resonator. a multi-section laser (300A; 300B; 400; 920A) of a length that includes a gain/modulation section (330A; 350) and a pre-bias section (330B; 355), both sections electrically connected to a diode laser resonator (315; 345) and both sections are independently controllable via laser driver circuitry; one or more processors; and one or more computer-readable hardware storage devices having stored thereon computer-executable instructions that are executable by the one or more processors to cause the computer system to control the laser driver circuitry to reduce a turn-on delay of the multi-section laser while enabling the multi-section laser to generate laser light having a spectral linewidth satisfying a threshold linewidth requirement by causing the computer system to: apply at least a minimum threshold amount of pre-bias current to the pre-bias section, wherein the at least the minimum threshold amount of pre-bias current, when applied, causes photons to be spontaneously emitted, and wherein wavelengths of the spontaneously emitted photons span at least a determined range of wavelengths as a result of the at least the minimum threshold amount of pre-bias current being applied; refrain from applying a gain current to the gain section until the diode laser resonator is seeded with a spectrum of photons from the pre-bias section; and after the diode laser resonator is seeded with the spectrum of photons, apply the gain current to the gain section to generate a seeded pulse of laser light having a determined optical intensity, wherein the seeded pulse of laser light is generated using at least some of the spectrum of photons that seeded the diode laser resonator. apply at least a minimum threshold amount of pre-bias current to the pre-bias section, wherein the at least the minimum threshold amount of pre-bias current, when applied, causes photons to be spontaneously emitted, and wherein wavelengths of the spontaneously emitted photons span at least a determined range of wavelengths as a result of the at least the minimum threshold amount of pre-bias current being applied; refrain from applying a gain current to the gain section until the diode laser resonator is seeded with a spectrum of photons from the pre-bias section; and after the diode laser resonator is seeded with the spectrum of photons, apply the gain current to the gain section to generate a seeded pulse of laser light having a determined optical intensity, wherein the seeded pulse of laser light is generated using at least some of the spectrum of photons that seeded the diode laser resonator.